Canllawiau

Gwirio gohebiaeth ddilys CThEF sy鈥檔 defnyddio mwy nag un dull cyfathrebu

Gwiriwch gysylltiadau diweddar gan CThEF i鈥檆h helpu i benderfynu a allai e-bost, galwad ff么n, neges destun neu lythyr amheus fod yn sgam.

Gan:
Cyllid a Thollau EF
Cyhoeddwyd
30 Gorffennaf 2021
Diweddarwyd ddiwethaf
23 Ebrill 2025 鈥� Gweld pob diweddariad

Weithiau mae CThEF yn defnyddio mwy nag un ffordd o gysylltu. Er enghraifft, mae鈥檔 bosibl y byddwn yn cysylltu 芒 chi drwy lythyr yn gyntaf cyn dilyn hwn i fyny gydag e-bost, galwad neu neges destun. Mae hyn oherwydd:

  • mae鈥檔 gallu darparu lefel ychwanegol o ddiogelwch
  • mae鈥檔 gallu helpu i baratoi cwsmeriaid ar gyfer yr ohebiaeth ddilynol
  • rhain yw鈥檙 manylion cyswllt sydd gan CThEF ar eich cyfer

Gall pob gohebiaeth gan CThEF a restrir ar y dudalen hon ddefnyddio mwy nag un dull cyfathrebu.

Rhoi gwybod i CThEF am alwadau ff么n, e-byst neu negeseuon testun amheus (yn agor tudalen Saesneg).

Newidiadau i鈥檆h cod treth聽

Mae鈥檔 bosibl y bydd CThEF yn cysylltu 芒 chi drwy e-bost neu neges destun.

Os ydym o鈥檙 farn eich bod wedi cael cod treth anghywir ar 么l dechrau swydd newydd, mae鈥檔 bosibl y byddwch yn cael e-bost neu neges destun yn egluro y bydd eich cod treth yn newid.

Ni ofynnir i chi am unrhyw wybodaeth bersonol nac ariannol, na gwybodaeth am y busnes.

Mae鈥檔 bosibl y byddwn yn eich cyfeirio at:

Hysbysiad i ddeiliaid data

Mae鈥檔 bosibl y bydd CThEF yn cysylltu 芒 chi drwy lythyr, drwy e-bost neu dros y ff么n.

Os ydych wedi cael naill ai hysbysiad ffurfiol neu hysbysiad ffurfiol o asesiadau drwy lythyr, efallai y bydd Canolfan Caffael a Chyfnewid Data CThEF yn cysylltu 芒 chi neu鈥檆h cynrychiolwyr i drafod hyn 芒 chi.

Efallai y byddwch yn cael galwad ff么n neu e-bost i鈥檆h helpu i ddilyn deddfwriaeth casglu data CThEF.

Goruchwyliaeth troseddau economaidd

Mae鈥檔 bosibl y bydd CThEF yn cysylltu 芒 chi drwy lythyr, e-bost, neges destun neu dros y ff么n.

Diben goruchwyliaeth troseddau economaidd yw gwneud y canlynol:

  • amddiffyn y DU rhag y risg o wyngalchu arian ac ariannu terfysgaeth

  • helpu busnesau i ddeall eu risgiau a鈥檜 hymrwymiadau

  • atal diffyg cydymffurfio

  • dod o hyd i fusnesau sydd heb eu cofrestru a mynd i鈥檙 afael 芒 nhw

  • cynnal ymyriadau effeithiol ar sail risg a gwybodaeth

Er mwyn gwneud hyn, bydd CThEF yn:

  • cysylltu 芒 busnesau drwy lythyr a thros y ff么n

  • cynnal ymweliadau cydymffurfio

  • anfon hysbysiadau drwy e-bost a thrwy negeseuon testun

  • cynnig addysg ar-lein i sicrhau bod busnesau鈥檔 bodloni rheoliadau gwyngalchu arian

Dyddiad cau ar gyfer Ffurflen TAW cyntaf yw 7 Mai 2025

O 15 Ebrill 2025 hyd at a chan gynnwys 7 Mai 2025, mae鈥檔 bosibl y bydd CThEF yn cysylltu 芒 chi drwy e-bost, llythyr neu dros y ff么n.

Os nad ydych wedi sefydlu cyfrif ar-lein, efallai y bydd CThEF yn cysylltu 芒 chi drwy neges destun, e-bost neu dros y ff么n i鈥檆h hatgoffa chi bod angen i chi gyflwyno eich Ffurflen TAW gyntaf.

Os nad ydych wedi sefydlu cyfrif ar-lein, byddwch yn cael:

  • neges destun 鈥� 3 wythnos cyn dyddiad cau eich Ffurflen TAW

  • e-bost 鈥� 2 wythnos cyn dyddiad cau eich Ffurflen TAW

  • galwad ff么n 鈥� 1 wythnos cyn dyddiad cau eich Ffurflen TAW

Pan fyddwn yn cysylltu 芒 chi, byddwn:

Arolwg CThEF ynghylch gwiriadau cydymffurfio

Mae鈥檔 bosibl y bydd CThEF yn cysylltu 芒 chi drwy e-bost neu lythyr ar 么l i wiriad cydymffurfio, gwiriad Isafswm Cyflog Cenedlaethol, neu wiriad gwarantau gael ei gau.

Efallai y byddwn yn cysylltu 芒 chi yn dilyn gwiriad cydymffurfio, gwiriad Isafswm Cyflog Cenedlaethol, neu wiriad gwarantau, er mwyn cwblhau arolwg byr ynghylch eich profiad yn ystod y gwiriad. Bydd yr arolwg yn galluogi CThEF i ddysgu a oes angen i ni wella鈥檙 ffordd rydym yn cynnal gwiriadau.

Mae鈥檙 arolwg yn wirfoddol ac ni fydd yn gofyn am unrhyw wybodaeth bersonol nac ariannol. Os oes angen rhagor o wybodaeth arnoch, cysylltwch 芒鈥檙 gweithiwr achos a ddeliodd 芒鈥檆h gwiriad.

Ymchwil i ohirio cosbau CThEF

O 17 Mawrth 2025 hyd at a chan gynnwys 31 Awst 2025, efallai y byddwch yn cael llythyr oddi wrth CThEF, wedi鈥檌 ddilyn gan e-bost neu alwad ff么n gan Verian.

Mae CThEF yn gweithio gydag asiantaeth ymchwil annibynnol, Verian, i archwilio safbwyntiau trethdalwyr ar gosbau a gohirio cosbau.

Bydd yr ymchwil yn helpu CThEF gyda deall effaith cosbau a gohirio cosbau ar drethdalwyr, a bydd hyn yn cael ei ddefnyddio er mwyn llywio penderfyniadau o ran polis茂au.

Os bydd rhywun yn cysylltu 芒 chi, efallai y bydd gofyn i chi gymryd rhan yn y canlynol:

  • cyfweliad
  • arolwg

Mae cymryd rhan yn wirfoddol. Bydd yr holl wybodaeth a roddir:

  • yn gyfrinachol
  • yn cael ei defnyddio at ddibenion ymchwil yn unig

Ymchwil o ran rhanddeiliaid CThEF

O 3 Chwefror 2025 hyd at a chan gynnwys 30 Mehefin 2025, efallai y bydd Woodnewton yn cysylltu 芒 chi drwy lythyr, drwy e-bost neu dros y ff么n.

Mae CThEF yn gweithio gyda鈥檙 asiantaeth ymchwil annibynnol, Woodnewton, i ddeall profiad rhanddeiliaid o ryngweithio 芒 CThEF a鈥檙 ffordd yr ydym yn cyfathrebu.

Bydd yr ymchwil yn helpu i lywio鈥檙 ffordd y bydd CThEF yn delio 芒 rhanddeiliaid yn y dyfodol.

Mae鈥檔 bosibl y bydd rhywun yn cysylltu 芒 chi os ydych yn rhanddeiliad sy鈥檔 rhyngweithio 芒 CThEF, er enghraifft os ydych yn un o鈥檙 canlynol:

  • cynrychiolydd y diwydiant
  • corff proffesiynol
  • asiant treth
  • seneddwr
  • datblygwr meddalwedd
  • yn y sector gwirfoddol

Mae鈥檔 bosibl y bydd gofyn i chi gymryd rhan:

  • mewn cyfweliad
  • mewn arolwg

Mae cymryd rhan yn wirfoddol ac, os gwnewch hynny, bydd eich atebion:聽

  • yn gyfrinachol
  • yn cael eu defnyddio at ddibenion ymchwil yn unig

Effaith Troi Treth yn Ddigidol ar gwsmeriaid Hunanasesiad Treth Incwm

O 30 Ionawr 2025 hyd at a chan gynnwys 8 Mai 2025, efallai y bydd Verian yn cysylltu 芒 chi drwy lythyr, drwy e-bost neu dros y ff么n.

Mae CThEF yn gweithio gydag asiantaeth ymchwil annibynnol, Verian, i ddeall effaith Troi Treth yn Ddigidol ar gwsmeriaid Hunanasesiad Treth Incwm.

Efallai y bydd Verian yn cysylltu 芒 chi ac yn gofyn i chi gymryd rhan mewn arolwg un-i-un dros y ff么n.

Yn ystod yr arolwg hwn, gofynnir cwestiynau i chi ynghylch eich:

  • Ffurflen Dreth Hunanasesiad ddiwethaf
  • ymwybyddiaeth a鈥檆h barn mewn perthynas 芒 Throi Treth yn Ddigidol

Bydd yr arolwg hefyd yn ein helpu:

  • i ddeall effaith cyflwyno Troi Treth yn Ddigidol ar gwsmeriaid Hunanasesiad Treth Incwm
  • i wella negeseua, gohebiaeth a chymorth i gwsmeriaid

Os byddwch yn cymryd rhan, bydd eich atebion ac unrhyw wybodaeth a rowch:

  • yn ddienw
  • yn cael eu defnyddio at ddibenion ymchwil yn unig

Treth Etifeddiant: ymchwil i wella鈥檙 broses

O 10 Mawrth 2025 hyd at a chan gynnwys 25 Ebrill 2025, mae鈥檔 bosibl y bydd 鈥楶eople for Research鈥� yn cysylltu 芒 chi drwy e-bost a thros y ff么n.

Mae CThEF yn cydweithio gyda People for Research i recriwtio pobl i gymryd rhan mewn cyfweliad awr o hyd, naill ai ar-lein (ar Microsoft Teams), neu dros y ff么n.

Bydd y cyfweliadau yn archwilio barn a phrofiadau cwsmeriaid er mwyn helpu i wella鈥檙 broses Treth Etifeddiant.

Mae cymryd rhan yn yr ymchwil hon yn wirfoddol. Os dewiswch gymryd rhan, bydd yr holl fanylion a鈥檙 ymatebion a rowch:

  • yn gyfrinachol

  • yn cael eu cadw鈥檔 ddiogel bob amser yn unol 芒 diogelu data

  • yn cael eu defnyddio at ddibenion ymchwil yn unig

T卯m Ymgysylltu wedi鈥檌 Reoli ar y Cyd (JMET) 鈥� ymholiad am gyflogres CThEF

Efallai y bydd CThEF yn cysylltu 芒 chi dros y ff么n, drwy anfon llythyr neu drwy e-bost.

Efallai y bydd CThEF yn cysylltu 芒 chyflogwyr neu drydydd parti i gadarnhau gwybodaeth am y gyflogres sydd wedi鈥檌 chyflwyno drwy ddefnyddio Gwybodaeth Amser Real (RTI).

Os bydd rhywun yn cysylltu 芒 chi dros y ff么n:

  • cewch wybod bod gennym ymholiad am gyflogres
  • bydd gofyn i chi ateb cwestiynau diogelwch safonol
  • bydd gofyn am ddadansoddiad o gyflog a didyniadau ar gyfer unigolyn

Os bydd rhywun yn cysylltu 芒 chi drwy e-bost:

  • cewch wybod bod gennym ymholiad am gyflogres
  • bydd gofyn i chi gysylltu 芒 CThEF dros y ff么n
  • bydd gofyn am ddadansoddiad o gyflog a didyniadau ar gyfer unigolyn 鈥� os cewch e-bost ar 么l siarad 芒 rhywun dros alwad ff么n

Os bydd rhywun yn cysylltu 芒 chi drwy anfon llythyr:

  • cewch wybod bod gennym ymholiad am gyflogres
  • bydd gofyn am ddadansoddiad o gyflog a didyniadau ar gyfer unigolyn

Mewngofnodi i鈥檆h cyfrif treth CThEF

Mae鈥檔 bosibl y bydd CThEF yn cysylltu 芒 chi drwy neges destun neu alwad llais awtomataidd.

Mae dilysu aml-ffactor yn nodwedd ddiogelwch ychwanegol sy鈥檔 disodli dilysu 2-gam. Mae鈥檔 helpu i rwystro rhywun arall rhag cael mynediad at eich cyfrif digidol, hyd yn oed os yw鈥檆h Dynodydd Defnyddiwr (ID) a鈥檙 cyfrinair yn ei feddiant.

Bydd CThEF yn anfon cod mynediad drwy neges destun neu alwad llais i鈥檙 rhif ff么n symudol neu linell dir a ddewiswyd gennych i gychwyn y camau dilysu aml-ffactor. Bydd angen y cod hwn arnoch i gwblhau鈥檙 broses o gael mynediad.

Ni fydd y negeseuon testun na鈥檙 galwadau llais hyn byth yn gofyn i chi roi gwybodaeth bersonol nac ariannol.

Os ydych wedi cychwyn camau dilysu aml-ffactor, byddwch ond yn gallu cael mynediad at y cyfrif drwy ddefnyddio鈥檙 canlynol:

  • eich Dynodydd Defnyddiwr (ID) a chyfrinair ar gyfer Porth y Llywodraeth

  • y ddyfais symudol neu linell dir yr ydych wedi鈥檌 chofrestru

Isafswm Cyflog Cenedlaethol a chyflogaeth

Mae鈥檔 bosibl y bydd CThEF yn cysylltu 芒 chi drwy lythyr, e-bost neu dros y ff么n.

Efallai y byddwn yn cysylltu 芒 chyflogeion i drafod manylion eu cyflogaeth bresennol neu flaenorol.

Os byddwn yn eich ffonio, byddwn yn:

  • rhoi gwybod i chi fod ein hymholiad yn ymwneud 芒鈥檙 Isafswm Cyflog Cenedlaethol neu鈥檙 Cyflog Byw Cenedlaethol

  • gofyn cwestiynau sylfaenol i chi am eich gwaith presennol neu am eich profiadau mewn swyddi blaenorol

  • cwblhau rhai cwestiynau diogelwch safonol

Ni fyddwn, ar unrhyw adeg, yn gofyn am wybodaeth ariannol bersonol, megis manylion banc, heb ysgrifennu atoch yn gyntaf.

Gallwch ofyn i ni beidio 芒 rhoi gwybod i鈥檆h cyflogwr presennol neu flaenorol am yr alwad.

Bydd CThEF hefyd yn cysylltu 芒 chyflogwyr mewn perthynas ag ymholiadau ynghylch yr Isafswm Cyflog Cenedlaethol neu鈥檙 Cyflog Byw Cenedlaethol.

Os ydych wedi cael llythyr, e-bost, neges destun neu alwad ff么n gan swyddfa arall yn CThEF, gallwch ffonio Gwasanaeth Cwsmeriaid Cymraeg CThEF i wirio bod yr ohebiaeth hon yn ddilys.

Gwallau cyffredin o ran yr Isafswm Cyflog Cenedlaethol

Mae鈥檔 bosibl y bydd CThEF yn cysylltu 芒 chi drwy e-bost neu lythyr.

Mae鈥檔 bosibl y byddwn yn cysylltu 芒 chyflogwyr neu drydydd part茂on i rannu gwybodaeth am wallau cyffredin gyda鈥檙 Isafswm Cyflog Cenedlaethol a鈥檙 Cyflog Byw Cenedlaethol. Bydd yr e-bost yn darparu cysylltiadau i ragor o wybodaeth a chymorth.

Mae鈥檔 bosibl y byddwn yn cysylltu 芒 chyflogeion drwy lythyr i ddarparu gwybodaeth am wallau cyffredin i gadw llygad amdanynt yn eu cyflog.

Bydd y llythyr yn esbonio sut i wneud cwyn am yr Isafswm Cyflog Cenedlaethol ac yn cynnwys cysylltiadau i ragor o wybodaeth a chymorth.

Busnesau tramor sy鈥檔 gwerthu gwasanaethau digidol i ddefnyddwyr yn y DU

Mae鈥檔 bosibl y bydd CThEF yn cysylltu 芒 chi drwy e-bost a llythyr.

Os oes gennych fusnes tramor a鈥檆h bod yn gwerthu gwasanaethau digidol i ddefnyddwyr yn y DU, efallai y byddwn yn cysylltu 芒 chi ynghylch eich rhwymedigaethau TAW yn y DU drwy e-bost a llythyr.

Bydd y llythyr a鈥檙 e-bost yn esbonio pam rydym yn cysylltu 芒 chi, ac yn gofyn i chi gysylltu 芒 ni. Ni fyddwn yn gofyn am unrhyw wybodaeth bersonol nac ariannol, na gwybodaeth am y busnes.

Busnesau tramor sy鈥檔 gwerthu nwyddau ar farchnadoedd ar-lein i ddefnyddwyr yn y DU

Mae鈥檔 bosibl y bydd CThEF yn cysylltu 芒 chi drwy e-bost a llythyr.

Os ydych wedi鈥檆h lleoli dramor ac yn masnachu ar farchnadoedd ar-lein, efallai y byddwn yn cysylltu 芒 chi i gyflwyno asesiadau TAW.

Byddwn yn anfon:

  • hysbysiad ffurfiol o asesiadau drwy lythyr

  • e-bost i roi gwybod i chi fod y llythyr hwn wedi cael ei anfon

Bydd yr e-bost yn:

  • peidio 芒 gofyn am unrhyw wybodaeth bersonol nac ariannol, na gwybodaeth am y busnes

  • gofyn i chi dalu eich asesiad drwy fynd i www.gov.uk a chwilio am 鈥榩ay your VAT bill鈥�

  • cynnwys cysylltiad i鈥檙 dudalen we hon, er mwyn i chi allu gweld bod CThEF yn defnyddio e-bost at y diben hwn

Rhaglen cyn-cyflwyno 鈥� adborth gan gwsmeriaid ar 么l 2 flynedd

O 21 Chwefror 2025 hyd at a chan gynnwys 30 Ebrill 2025, mae鈥檔 bosibl y bydd CThEF yn cysylltu 芒 chi drwy e-bost neu dros y ff么n.

Mae CThEF yn cynnal ymchwil i ddeall eich profiad o鈥檙 sgyrsiau cyn-cyflwyno a gynhaliwyd rhwng mis Ebrill 2023 a mis Ionawr 2024.

Bydd yr ymchwil hon yn helpu CThEF i wella ei wasanaethau.

Efallai y byddwch yn cael e-bost neu alwad ff么n yn eich gwahodd i roi adborth ynghylch eich profiad o鈥檙 sgwrs cyn-cyflwyno.

Mae cymryd rhan yn yr ymchwil hon yn wirfoddol ac, os gwnewch hynny, bydd yr holl ymatebion a鈥檙 wybodaeth a roddir yn gwbl ddienw. Bydd eich manylion personol yn cael eu cadw鈥檔 ddiogel yn unol 芒 chyfraith diogelu data.

Hunanasesiad 鈥� cais i adael

Mae鈥檔 bosibl y bydd CThEF yn cysylltu 芒 chi drwy e-bost neu neges destun.

Gall CThEF gysylltu 芒 chi drwy e-bost neu neges destun os ydych yn rhoi gwybod iddynt:

  • rydych am adael Hunanasesiad
  • nad ydych yn hunangyflogedig mwyach

Bydd CThEF yn cysylltu 芒 chi gan ddefnyddio鈥檙 cyfeiriad e-bost neu鈥檙 rhif ff么n rydych wedi鈥檌 roi. Teitl yr e-bost fydd 鈥楨ich cais i adael Hunanasesiad鈥�.

Ni ofynnir i chi am unrhyw wybodaeth bersonol nac ariannol.

Hysbysiadau statudol yn gofyn am wybodaeth

Mae鈥檔 bosibl y bydd CThEF yn cysylltu 芒 chi drwy lythyr, e-bost neu dros y ff么n.

Mae Canolfan Caffael a Chyfnewid Data CThEF yn anfon hysbysiadau statudol yn rheolaidd at y rheiny sy鈥檔 cadw mathau penodol o wybodaeth, yn gofyn iddynt roi manylion perthnasol i CThEF. Mae gan y rheiny sy鈥檔 cadw鈥檙 wybodaeth ymrwymiad cyfreithiol i ddarparu鈥檙 data y gofynnir amdanynt.

Gellir anfon yr hysbysiadau sy鈥檔 gofyn am wybodaeth drwy鈥檙 post neu drwy e-bost.

Bydd hysbysiadau a anfonir drwy e-bost yn cynnwys cysylltiad i鈥檙 dudalen we hon, er mwyn i chi allu gweld bod CThEF yn defnyddio e-bost at y diben hwn.

Panel ymchwil masnachwyr a chyfryngwyr

O 14 Mai 2025 hyd at a chan gynnwys 4 Gorffennaf 2025, mae鈥檔 bosibl y byddwch yn cael llythyr, e-bost neu alwad ff么n oddi wrth Ipsos.

Mae CThEF yn gweithio gydag asiantaeth ymchwil annibynnol Ipsos i ddeall profiadau masnachwyr a chyfryngwyr o fewnforio ac allforio i mewn ac allan o鈥檙 DU.

Mae鈥檔 bosibl y bydd rhywun yn cysylltu 芒 chi eto am ymchwil bellach ar 么l yr arolwg cychwynnol.

mBydd yr ymchwil yn helpu CThEF i ddatblygu a gwella prosesau a gwasanaethau i chi a defnyddwyr eraill.

Os byddwch yn cymryd rhan, bydd eich atebion ac unrhyw wybodaeth a rowch:

  • yn ddienw
  • yn gyfrinachol
  • yn cael ei defnyddio at ddibenion ymchwil yn unig

Anweithgarwch o ran y gofrestr TAW

Mae鈥檔 bosibl y bydd CThEF yn cysylltu 芒 chi dros y ff么n neu drwy e-bost.

Mae鈥檔 bosibl y byddwn yn cysylltu 芒 chi os ydym o鈥檙 farn nad oes angen i chi feddu ar rif cofrestru TAW mwyach, oherwydd anweithgarwch diweddar ar eich cyfrif TAW. Efallai y byddwch yn cael galwad ff么n neu e-bost, a bydd yr e-bost yn cyfeirio at anweithgarwch o ran y gofrestr TAW.

Bydd y galwadau ff么n neu鈥檙 e-byst yn gofyn i chi gadarnhau a oes angen i chi fod wedi鈥檆h cofrestru ar gyfer TAW o hyd, ac yn gofyn i chi roi rhywfaint o wybodaeth sylfaenol am ble yr ydych yn masnachu.

Ni fydd y galwadau na鈥檙 e-byst yn gofyn am wybodaeth bersonol nac ariannol.

Ymweliadau ac archwiliadau TAW

Mae鈥檔 bosibl y bydd CThEF yn cysylltu 芒 chi dros y ff么n, drwy e-bost neu drwy lythyr.

Efallai y byddwn yn cysylltu 芒 chi i drefnu ymweliadau ac archwiliadau TAW (yn agor tudalen Saesneg).

Bydd e-bost yn dweud wrthych ein bod wedi ceisio cysylltu 芒 chi gan ofyn i chi ein ffonio鈥檔 么l.

Bydd yr alwad ff么n yn:

  • gofyn i chi drefnu ymweliad

  • cadarnhau鈥檙 wybodaeth yr hoffem ei gweld

Bydd llythyr yn:

  • gofyn i chi ein ffonio i drefnu ymweliad

  • cadarnhau鈥檙 wybodaeth yr hoffem ei gweld

Byddwn bob amser yn ceisio cysylltu 芒 chi dros y ff么n yn gyntaf, os nad ydym yn cael gafael arnoch, byddwn yn anfon llythyr neu e-bost atoch.

Bydd gennym eich enw ac enw鈥檆h busnes yn barod pan fyddwn yn cysylltu 芒 chi. Ni fyddwn yn gofyn am unrhyw wybodaeth bersonol, megis eich manylion banc.

Os nad ydych yn si诺r os yw鈥檙 alwad, yr e-bost neu鈥檙 llythyr gan CThEF, gallwch gysylltu 芒鈥檙 llinell gymorth Gymraeg ar gyfer Ymholiadau TAW.

Updates to this page

Cyhoeddwyd ar 30 Gorffennaf 2021
Diweddarwyd ddiwethaf ar 23 Ebrill 2025 show all updates

  1. Information about 'Traders and intermediaries research panel' and 'First VAT return is due on 7 May 2025' have been added.

  2. Information about 'First VAT return is due on 7 May 2025' has been added.

  3. Information about 'Impact of Making Tax Digital on Income Tax for Self Assessment customers' has been extended to 8 May 2025.

  4. Added translation

  5. We have added information on research to improve the Inheritance Tax process.

  6. Information about 'Jointly Managed Engagement Team (JMET) 鈥� HMRC payroll enquiry' research and 'HMRC penalty suspension research' has been added.

  7. Information about research into how companies manage their plastic packaging data has been removed as this research is no longer taking place.

  8. Information about giving feedback on experience of pre-filing conversations has been added.

  9. Information about research into how companies manage their plastic packaging data has been added.

  10. Information about pension research has been added.

  11. Information about 'Agency and temporary workers (the agency legislation)' has been extended, to end 31 March 2025.

  12. Information about 'Identity verification and authentication 鈥� exploring organisations鈥� experiences' has been added.

  13. Information about 'agency and temporary workers (the agency legislation)' has been added.

  14. Information about HMRC stakeholder research聽and impact of Making Tax Digital on Income Tax for Self Assessment customers research has been added. Help to Save research has been extended to 28 February 2025.

  15. Information about 'Declaring your income' has been added.

  16. Information about 'Self Assessment 鈥� request to leave' has been added.

  17. Possible involvement in tax avoidance schemes聽research has been added. Cryptoasset research has been extended to 31 January 2025.

  18. Information about Making Tax Digital for Income Tax Self Assessment testing phase and Making Tax Digital for Income Tax Self Assessment 鈥� agent preparedness research has been added. Help to Save research has been extended to 31 January 2025.

  19. Information about hiring overseas employees to work in the UK on a short or medium term arrangement research has been added.

  20. Information about Annual Tax on Enveloped Dwellings and understanding unrepresented customer needs research has been added. Venture capital schemes research has been extended to 15 November 2024.

  21. Information about the wealthy compliance portal has been added.

  22. Information about HMRC and tax system experience research has been added.

  23. Customs authorisations survey improvement research has been extended to 8 November 2024.

  24. Information about compliance checks into personal and business tax affairs research has been added. Customs processes research has been extended to 17 January 2025.

  25. Information about customs authorisations survey improvement research has been added.

  26. Information about cryptoasset research has been added.

  27. Information about pension schemes migration research has been added.

  28. Information about social media content creation research has been added. Information about venture capital schemes research has been added. End date for National Minimum Wage geographical compliance approach research has been extended.

  29. The end dates for 'Understanding the use of the Lifetime ISA' and 'Help to Save research' have been extended to 30 November 2024.

  30. Information about Large Business survey and Wealthy pre-filing research have been added.

  31. The impact of government childcare support on working parents research has been extended from 9 August 2024 to 3 October 2024.

  32. The pension schemes migration research has been extended from 26 July 2024 to 2 August 2024.

  33. Information added for HMRC customer experience research has been added.

  34. Information about pension schemes migration research has been added.

  35. Information about cryptoasset research has been updated to extend the period of contact to 30 August 2024.

  36. Information about HMRC agents, small and mid-sized business and customs processes research has been added.

  37. Information about research into HMRC customer education has been added.

  38. The information on research into the impact of HMRC communications and safety and security declarations on EU imports has been removed, as these studies have now ended.

  39. The 'temporary Customer Compliance Manager service for mid-size businesses' section has been updated to extend the period of contact to 31 May.

  40. Information about tax code notice research has been added.

  41. Information about research into the cryptoasset industry and how people interact with video guidance has been added.

  42. Information about research for the impact of Making Tax Digital (MTD) on Income Tax Self Assessment (ITSA) customers and information about understanding the use of the Lifetime ISA has been added.

  43. Information about research to understand the impact of HMRC communications has been added. Information about GB-EU traders research and Making Tax Digital for Income Tax pilot have been removed as contact for these have ended.

  44. Information about Help to Save research, temporary Customer Compliance Manager service for mid-size businesses, and uncertain tax treatment research has been added.

  45. Information about the impact of government childcare support on working parents and the impact of border check processes on businesses research has been added.

  46. Information about Single Trade Window user testing, Enterprise Investment Schemes and Self Assessment customer communications research has been added.

  47. Information about VAT Penalty Reform research has been added.

  48. Information about business tax account research has been added. Information about safety and security declarations on EU imports research has been added. Information about The Large Business Survey 2023 has been removed as contact for this has ended.

  49. Information about GB-EU traders research and company structure and financial decision making research has been added.

  50. Information about Bulk Import Reduced Data Set (BIRDS) research has been added to the page.

  51. Information about identity verification and account set-up research has been added.

  52. Information about HMRC potentially contacting you about changes to your tax code has been added.

  53. Information about Employee Ownership Trusts has been added. Information about Help to Save research, Landlord research, Mid-sized Business Customer Survey, Offshore penalties regime 鈥� research into effectiveness, Small businesses' interactions with HMRC, Vaping market research, VAT deregistration research and Venture Capital Reliefs 鈥� Understanding the customer journey have all been removed as contact for these have ended.

  54. Information about National Minimum Wage geographical compliance approach research has been added.

  55. Added translation

  56. Information about VAT visits and inspections has been added.

  57. Information about simplified mileage rates in the UK have been removed as contact for these have ended, updated translation

  58. Information about HMRC stakeholder engagement research has been added.

  59. Information on Venture Capital Reliefs had been updated to extend end date of contact

  60. added translation

  61. Information about GVMS (Goods Vehicle Movement Service) research has been added.

  62. Information about Understanding the customer journey of companies who seek investors by using Venture Capital Reliefs schemes has been added. Information about Electricity Generator Levy and measuring the impact of Making Tax Digital for VAT customers has been added. Information about Corporation Tax research, Employment status in the UK, VAT payable order repayments have been removed as contact for these have ended.

  63. Information about a customs intermediaries monitoring survey and a new company structure and financial decision-making research survey has been added.

  64. Information about research on Help to Save and research on HMRC communications with customers who complete paper Self Assessments has been added.

  65. Information about Mid-sized Business Customer Survey research has been added.

  66. Research about businesses use of simplified mileage rates, customer experience of HMRC, and how customers authorise agents to interact with the HMRC added.

  67. Added translation

  68. Research regarding childcare providers engagement with Tax-Free Childcare, effectiveness of the offshore penalty regime, and the Large Business Survey 2023 added to the page. Impact of Making Tax Digital research removed as the contact dates for this ended on 21 July 2023.

  69. Information on the company names, and the dates they may contact you to take part in research on the experiences of businesses new to customs has been updated.

  70. Information about Lifetime ISAs research has been added. Information about employer pension salary sacrifice schemes, Income Tax Self Assessment research on future timely payment and research and development tax relief has been removed as contact for these has ended.

  71. Information about a Great Britain EU traders survey and Corporation Tax research has been added, and details about the schools outreach programme analysis, digital channels research and asset managers self-assessment feedback have been removed.

  72. Information about research and development tax relief has been added.

  73. Information has been added about Company structure and financial decision-making research, Impact of Making Tax Digital, Asset managers self-assessment feedback, and Landlord research.

  74. Information about VAT payable order repayments has been added.

  75. Information about research on the experiences of businesses new to customs has been added.

  76. We have removed 'Impact of Making Tax Digital research'.

  77. Research on VAT deregistration, the vaping market, small businesses' interactions with HMRC, and Self Assessment and paper communications, has been added. We have removed out-of-date information on: digital by default, electronic sales suppression, impact of Making Tax Digital for newly registered VAT customers, Income Tax for small businesses, VAT Flat Rate Scheme.

  78. Information has been added about Digital channels and Employer pension salary sacrifice schemes.

  79. Information about contact regarding Electronic Sales Suppression has been added.

  80. Added translation

  81. We have added two updates on research about employment status and Income Tax for small businesses.

  82. Added translation

  83. We have added information about a HMRC compliance check survey.

  84. We have added information about contact from HMRC on the Let Property Campaign. We have also updated the section Income Tax Self Assessment research on future timely payments. IFF Research will contact you by letter and then phone call from 20 February 2023 up to and including 28 June 2023. We have added information on Digital by default. HMRC may contact you about this between 20 February 2023 and 28 April 2023.

  85. Information about research on customs authorisations of UK businesses, temporary customer compliance manager support, the temporary customer compliance manager support survey, and VAT registration experience has been removed as contact for these has ended.

  86. Information about research into the impact of Making Tax Digital for newly registered VAT customers been added.

  87. Information about research on stakeholder engagement has been added.

  88. Information about the VAT on the Energy Bills Support Scheme has been added. Information about the Customs intermediaries monitoring survey has been removed as the contact dates for this ended on 23 January 2023.

  89. Information about research on making a payment to HMRC, Tax-Free Childcare and parent鈥檚 working patterns and data holder notices have been added. Information about the Large Business Customer Survey 2022 has been removed as the contact dates for this ended on 6 January 2023.

  90. Research into agents of wealthy customers has been extended from 30 December 2022 to 31 March 2023. In addition agents may now be contacted by email or letter then phone or video call.

  91. Information about research on Customs authorisations of UK Businesses, Customs declarations, Debt management payment plan questionnaire, Making Tax Digital for VAT, VAT Flat Rate Scheme and VAT registration experience has been added.

  92. Added translation

  93. Information about offshore advice for taxpayers and their advisors has been added. We have also added information on employer National Insurance contributions relief for veterans.

  94. Information about supply chains research has been added.

  95. Information about research into agents of wealthy customers and businesses recently in debt with HMRC has been added.

  96. Information about Income Tax Self Assessment research on future timely payment and information about the temporary Customer Compliance Manager support survey has been added. Information about Corporation Tax research and research on HMRC's digital services has been removed as the contact dates for these ended on 18 November 2022.

  97. User research on employers' experiences of the Coronavirus Job Retention Scheme has been extended from 17 November 2022 to 18 November 2022.

  98. Information on Child Benefit digital service research has been added.

  99. Research on employer benefits in kind has been extended from 30 November 2022 to 9 December 2022.

  100. Research on HMRC鈥檚 digital services has been extended from 31 October 2022 to 18 November 2022.

  101. User research on employers' experiences of the Coronavirus Job Retention Scheme has been extended from 10 November 2022 to 17 November 2022.

  102. IFF Research on employer benefits in kind has been extended to 30 November 2022.

  103. Information on the Automatic Exchange of Information has been added. The customs intermediaries monitoring survey research will continue until 23 January 2023.

  104. Research on employers' experiences of the Coronavirus Job Retention Scheme will continue until 10 November 2022.

  105. Information on navigating between business taxes and personal taxes online research has been added.

  106. Updated because the research on employer's experiences of the coronavirus job retention scheme has been extended to 7 October 2022.

  107. Information about research on HMRC's digital services has been added.

  108. Information on Corporation Tax research has been added.

  109. Information on VAT return research has been added.

  110. Information on the Large Business Customer Survey 2022 and temporary Customer Compliance Manager support has been added.

  111. Added translation

  112. Information on the customer experience of HMRC has been added.

  113. Information on the Mid-sized business customer survey has been added.

  114. Information for businesses who use CHIEF for import declarations has been added.

  115. Information on Making Tax Digital for Income Tax pilot and employer benefits in kind has been added.

  116. Information on economic crime supervision and experiences of HMRC VAT registration has been added.

  117. Information on HMRC and HM Treasury鈥檚 10 year Tax Administration Strategy has been added.

  118. Information on customs intermediaries' experience and Making Tax Digital for VAT registered customers has been added.

  119. Information on the customs intermediaries monitoring survey has been added.

  120. Information about research on Capital Allowances has been added.

  121. Research into understanding tax administration for businesses has been extended from 27 May 2022 to 8 July 2022 and information about research for the Cycle to Work Scheme has been added.

  122. Added section on 'Overseas businesses that sell goods on online marketplaces to UK consumers'.

  123. Added information on the government analysis schools outreach programme and employers' experiences of the Coronavirus Job Retention Scheme.

  124. The information for the 'Research to explore market shifts and behaviours relating to Stamp Duty' section has been re-added as it has been extended.

  125. Added information on 'Research to improve VAT services for small and micro businesses'.

  126. The section about tax relief evaluations has been updated with new contact information from 1 July 2021 to 30 November 2022.

  127. Added information on 'Research into understanding tax administration for businesses'.

  128. Added section 'Annual Tax on Enveloped Dwellings (ATED) reminder to agents and companies'.

  129. Added information on research on the Profit Diversion Compliance Facility and the Diverted Profits Investigation Approach, and the end date of the traders survey has been changed from 10 March 2022 to 25 March 2022.

  130. Added information on repayments research.

  131. Added information on research into self-assessment and VAT repayment systems.

  132. Added information on research to explore market shifts and behaviours relating to Stamp Duty.

  133. Information on research on agent experiences of HMRC's digital services has been added.

  134. Added section 'Research letters about the disability element of Tax Credits'.

  135. Added 'Research to improve HMRC communications for individuals and businesses' section.

  136. Added sections 'Research into the impact of full controls on customs intermediaries' and 'Traders survey'.

  137. Added sections Effects of the super-deduction, Single Trade Window research and Trust survey.

  138. Information on 'Payment of Class 2 National Insurance Contributions through Self Assessment' has been added.

  139. Information on further research on the HMRC Coronavirus Job Retention Scheme added.

  140. Information about the EU Settlement Scheme has been added.

  141. Information added about reform research for off-payroll working rules from 24 September 2021 to 10 December 2021.

  142. Information has been added about HMRC contacting CHIEF users who declare goods into Northern Ireland from outside the UK and EU.

  143. Added 'Large Business Customer Experience Survey 2021' section.

  144. Information about Tax relief evaluations from 1 July 2021 to 31 June 2022 and Traders survey research from 27 August to 12 October 2021 added.

  145. Information about customer research on Corporation Tax reliefs from August 2021 to 30 September 2021 has been added.

  146. We have added information about customer research by HMRC from 12 August to 15 September by 2021.

  147. We have added research on detached workers and social security.

  148. Updated to show HMRC is using a new number to send text messages to customers.

  149. Added translation

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