COM150 - Forms index
Source: gov.uk (2025-11-26)


Alphanumeric (#Alphanumeric)Numeric (#Numeric)

Alphanumeric

Form number

Example

Description

AOC15

N/A

Used by the ‘Interest Review Unit’ in Accounts Office (Cumbernauld), to return papers to their originator.

AOC385

N/A

Used by Accounts Office (Cumbernauld) to forward correspondence to the responsible CT office where a suspension has been made and the content of the correspondence suggests there may be an appeal against the charge.

AZ6

N/A

Multi purpose form used by Accounts Office to send correspondence to the responsible CT or Debt Management office.

AZ20

N/A

Notification to a responsible CT office, where no suspension is recorded in a Debt Management office on receipt of an appeal.

AZ44

N/A

Used in Accounts Office to obtain authority to discharge interest.

AZ63

N/A

Used in a Debt Management office to obtain authority to discharge interest.

Book 18

N/A

Book used in a Debt Management office to record details of a returned cheque (Book 18 is also a section in Accounts Office that deals with returned cheques).

C20A

N/A

County Court proceedings correspondence file.

C28(Z) and C28A(Z)

N/A

Transfer of County Court costs relating to computer charges.

C49

N/A

Debt Management office form used to process returned cheque cases.

C50

N/A

Letter returning cheque for amendment or full completion.

C52D

N/A

Used by Debt Management offices to send an appeal or objection to the responsible CT office.

C514

N/A

Used for transfer of case with County Court costs.

CT4(Z)

N/A

A manual Corporation Tax assessing set.

CT41G (new)

CT41G (PDF 676kb)

Issued to provide information to newly incorporated companies. Note: issued by COTAX from April 2019.

CT41G(Clubs)

CT41G Clubs (PDF 211kb) (http://www.hmrc.gov.uk/gds/com/attachments/ct41g_clubs.pdf)

Issued manually to obtain details of new clubs, societies and voluntary associations and other similar bodies.

CT61 Notice

N/A

Notice to make a CT61 return. Issued by SAFE.

CT61 Return

N/A

Return of Income Tax on company payments, interest paid, alternative finance payments, manufactured payments from abroad and tax on relevant distributions. Issued by SAFE.

CT64-4(Ack)

CT64-4 Ack (PDF 60kb) (http://www.hmrc.gov.uk/gds/com/attachments/ct64-4_ack.pdf)

Used to confirm acknowledgement of an appeal, and acceptance of a postponement application.

CT64-5(1)

CT64-5 (1) (PDF 34kb)

A range of forms used on receipt of an unacceptable postponement application.

CT133(R)

N/A

A sub-folder held in the main CT file, used to house repayment papers and convey information and instructions to clerical staff.

CT204

N/A

Information form issued to a company, club or association to review dormancy status and advise active companies to use the Online Tax Registration Service to tell HMRC. From February 2019 this form stopped being issued as part of the changes implemented by the introduction of the new Business Registration process.

CT205

CT205 (PDF 685kb) (http://www.hmrc.gov.uk/gds/com/attachments/ct205.pdf)

Return reminder issued 28 days before the normal filing date where a payment or nil payslip has been received by Accounts Office but no return has been logged. Where there is a 64-8 signal on the record, only the agent copy is issued. From June 2025 this form will no longer be issued.

CT205

CT205A (PDF 625kb) (http://www.hmrc.gov.uk/gds/com/attachments/ct205a.pdf)

Agent copy of the CT205. From June 2025 this form will no longer be issued.

CT207

CT207 (PDF 1.1mb) (http://www.hmrc.gov.uk/gds/com/attachments/ct207.pdf)

An interest statement sent to the company or agent showing the interest chargeable to a specific date on tax paid late. From June 2025 this form will no longer be issued.

CT208

CT208PR1 (PDF 1.4mb) (http://www.hmrc.gov.uk/gds/com/attachments/ct208-pr1.pdf)

PR1 - A payment reminder issued by COTAX 20 days before the payment due date to the company’s Registered Office address if no payment has been received for that AP.

CT209

CT209 (PDF 548kb) (http://www.hmrc.gov.uk/gds/com/attachments/ct209.pdf)

Receipt form, issued on request, following receipt of payment at Accounts Office. From June 2025 this form will no longer be issued.

CT211: Penalty Determination (flat rate)

CT211 Penalty Determination - Flat rate (PDF 809kb)

Penalty determination notice issued to a company showing details of the penalties charged for the failure to deliver one or more returns in response to a notice to deliver.

CTSA214

N/A

The stock letter used to accompany an unsatisfactory return when it is sent back to a company. This letter is available on SEES.

CT216 DN1

CT216 DN1 (PDF 885kb)

Demand Notes which include mixed duty types and penalty only examples for DN1, DN4 and DN5. COTAX no longer issues DN2, DN3 and DN6.

CT220 (together with a table showing the various messages that can appear on it)

CT220 (PDF 430kb)

Notice of assessment to a company showing its CT liability for a CT Pay and File AP.

CT250(P)

N/A

Issued by responsible CT office to Accounts Office, when, an assessment is made or amended to include a carry back and it displaces a relief, an amendment is made to give S458 CTA 2010 (formerly S419(4) ICTA 1988) relief, the Clerical Interest Indicator is already set on the AP. This form is available on SEES.

Intelligent Payment Processing (https://ipp.guidance.ns2p.corp.hmrc.gov.uk/) (IPP) Single Form

N/A

Issued by responsible CT office to Corporate Finance - this form can be accessed using the link.

310(Z) - Special Assessment

N/A

A manual CT assessing set available on SEES.

CT600 (2008) Version 2

CT600 (2008) Version2 (https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/374420/ct600-2008.pdf)

Company Tax Return for accounting periods starting before 1 April 2015.

CT600 (Short) (2008) Version 2

CT600 (Short) (2008) Version2 (https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/374419/ct600-short-2008.pdf)

Short Company Tax Return.

CT600 Guide (2008) Version 2

CT600 Guide (2008) Version 2 (https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/415037/CT600_Guide.pdf)

Guide to completing Company Tax Return CT600 (2008) Version 2.

CT600 (2024) Version 3

CT600 (2024) Version 3 (https://www.gov.uk/government/publications/corporation-tax-company-tax-return-ct600-2015-version-3)

Company Tax Return for accounting periods starting on or after 1 April 2015.

CT600 (2024) Version 3 - Welsh Language Version

CT600 (2024) Version 3 – Welsh Language (https://www.gov.uk/government/publications/corporation-tax-company-tax-return-ct600-2015-version-3.cy)

Company Tax Return for accounting periods starting on or after 1 April 2015 - Welsh Language version

CT600 Guide (2024) Version 3 (https://www.gov.uk/government/publications/corporation-tax-company-tax-return-guide)

CT600A (2015) Version 3 (https://www.gov.uk/government/publications/corporation-tax-company-tax-return-ct600-2015-version-3) (https://www.gov.uk/government/publications/corporation-tax-close-company-loans-and-arrangements-to-confer-benefits-on-participators-ct600a-2015-version-3)

CT600A (2015) Version 3 - Welsh Language Version

CT600A (2015) Version 3 (https://www.gov.uk/government/publications/corporation-tax-company-tax-return-ct600-2015-version-3) - Welsh Language Version (https://www.gov.uk/government/publications/corporation-tax-close-company-loans-and-arrangements-to-confer-benefits-on-participators-ct600a-2015-version-3.cy)

Company Tax Return - Supplementary Pages: Close company loans and arrangements to order benefits on participators. Welsh Language Version

CT600B (2022) Version 3 (http://www.hmrc.gov.uk/gds/com/attachments/CT600B_2022.pdf)

Company Tax Return - Supplementary Pages: Controlled foreign companies and foreign permanent establishment exemptions.

CT600B (2022) Version 3 – Welsh Language Version (http://www.hmrc.gov.uk/gds/com/attachments/CT600B_2022_Cymraeg.pdf)

Company Tax Return - Supplementary Pages: Controlled foreign companies and foreign permanent establishment exemptions. Welsh Language Version.

CT600C (2018) Version 3

CT600C (2018) Version 3 (https://www.gov.uk/government/publications/corporation-tax-group-and-consortium-relief-ct600c-2015-version-3)

Company Tax Return - Supplementary Pages: Group and Consortium relief.

CT600D (2015) Version 3

CT600D (2015) Version 3 (https://www.gov.uk/government/publications/corporation-tax-insurance-ct600d-2015-version-3)

Company Tax Return - Supplementary Pages: Insurance.

CT600E (2015) Version 3

CT600E (2015) Version 3 (https://www.gov.uk/government/publications/corporation-tax-charity-and-community-amateur-sports-clubs-ct600e-2015-version-3)

Company Tax Return - Supplementary Pages: Charities and Community Amateur Sports Clubs (CASCs).

Company Tax Return - Supplementary Pages: Charities and Community Amateur Sports Clubs (CASCs). Welsh Language Version.

CT600F (2023) Version 3

CT600F (2023) Version 3 (https://www.gov.uk/government/publications/corporation-tax-tonnage-tax-ct600f-2015-version-3)

Company Tax Return - Supplementary Pages: Tonnage Tax.

CT600H (2015) Version 3

CT600H (2015) Version 3 (https://www.gov.uk/government/publications/corporation-tax-cross-border-royalties-ct600h-2015-version-3)

Company Tax Return - Supplementary Pages: Cross-border Royalties.

CT600I (2019) Version 3

CT600I (2019) Version 3 (https://www.gov.uk/government/publications/corporation-tax-supplementary-charge-in-respect-of-ring-fence-trades-ct600i-2015-version-3)

Company Tax Return - Supplementary Pages: Supplementary charge in respect of ring fenced trades.

CT600J (2015) Version 3

CT600J (2015) Version 3 (https://www.gov.uk/government/publications/corporation-tax-disclosure-of-tax-avoidance-schemes-ct600j-2015-version-3)

Company Tax Return - Supplementary Pages: Disclosure of tax avoidance schemes.

CT600K (2017) Version 3

CT600K (2017) Version 3 (https://www.gov.uk/government/publications/corporation-tax-restitution-tax-ct600k-2017-version-3)

Company Tax Return - Supplementary Page: Restitution Tax

CT600L (2022) Version 3 (http://www.hmrc.gov.uk/gds/com/attachments/CT600L.pdf)

Company Tax Return - Supplementary Page: Research and development

CT600L (2022) Version 3 - Welsh Language Version

CT600L (2022) Version 3 - Welsh Language Version (http://www.hmrc.gov.uk/gds/com/attachments/CT600L_2022_Baselined_WELSH_updated.pdf)

Company Tax Return - Supplementary Page: Research and development - Welsh Language Version.

CT600M (2024) Version 3

CT600M (2024) Version 3 (https://www.gov.uk/government/publications/corporation-tax-freeports-ct600m-2022-version-3)

Company Tax Return - Supplementary Page: Freeports

CT600M (2024) Version 3 - Welsh Language Version

CT600M (2024) Version 3 – Welsh Language Version (https://www.gov.uk/government/publications/corporation-tax-freeports-ct600m-2022-version-3.cy)

Company Tax Return - Supplementary Page: Freeports - Welsh Language Version.

CT600N (2023) Version 3

CT600N (2023) Version 3 (https://www.gov.uk/government/publications/corporation-tax-residential-property-developer-tax-ct600n)

Company Tax Return - Supplementary Page: Residential Property Developer Tax

CT600N (2023) Version 3 - Welsh Language Version

CT600N (2023) Version 3 - Welsh Language Version (https://www.gov.uk/government/publications/corporation-tax-residential-property-developer-tax-ct600n.cy)

Company Tax Return - Supplementary Page: Residential Property Developer Tax. Welsh Language Version.

CT603

CT603 (PDF 28kb) (http://www.hmrc.gov.uk/gds/com/attachments/ct603.pdf)

Notice to deliver a return issued for a CTSA AP

CT603

CT603A (PDF 519kb)

Form issued to an agent showing a list of clients to which a notice to deliver has been issued. From June 2025 this form will no longer be issued.

CT608 (Cumb)

CT608 (PDF 688kb)

Payment reminder form issued to an instalment payments case. From June 2025 this form will no longer be issued.

CT620

N/A

Used for CTSA APs to notify a company of a revenue determination and any assessing actions after the self assessment. Examples of the various versions are available below together with the notes that accompany them.

CT620-ACK(1)/ CT620-ACK(2)

N/A

Acknowledgement of a company tax return. From the 19 September 2016 this form stopped being issued from COTAX as the company can see the self assessment charge on their online tax account.

CT620-AMD

CT620 - AMD (PDF 189kb) (http://www.hmrc.gov.uk/gds/com/attachments/ct620_amd.pdf)

Notice of amendment to a company tax return (revenue amendment).

CT620-AMK

CT620 - AMK (PDF 142kb)

Acknowledgement of amendment to a company tax return (taxpayer amendment).

CT620-ASA

CT620 - ASA (PDF 176kb) (http://www.hmrc.gov.uk/gds/com/attachments/ct620_asa.pdf)

Notice of amendment of self-assessment during enquiry into company tax return (jeopardy amendment).

CT620-CLA

CT620 - CLA (PDF 200kb) (http://www.hmrc.gov.uk/gds/com/attachments/ct620_cla.pdf)

Claims and elections not included in a company tax return.

CT620-CLO

CT620 - CLO (PDF 182kb) (http://www.hmrc.gov.uk/gds/com/attachments/ct620_clo.pdf)

Notice of completion of enquiry into a company tax return.

CT620-COR

CT620 - COR (PDF 247kb) (http://www.hmrc.gov.uk/gds/com/attachments/ct620_cor.pdf)

Notice of correction to a company tax return.

CT620-DET

CT620 - DET (PDF 211kb) (http://www.hmrc.gov.uk/gds/com/attachments/ct620_det.pdf)

Determination of tax payable in the absence of a company tax return (revenue determination).

CT620-DIS

CT620 - DIS (PDF 211kb) (http://www.hmrc.gov.uk/gds/com/attachments/ct620_dis.pdf)

Assessment to make good to the Crown a loss of tax (discovery assessment).

CT630

CT630 (PDF 564kb) (http://www.hmrc.gov.uk/gds/com/attachments/ct630.pdf)

A notice issued to the nominated company once a tax charge has been established on each of the participating companies APs in a Group Payment Arrangement detailing charges held for each participating company, payments made in respect of the Group Payment Period and any apparent underpayment or overpayment.

CT631

CT631 (PDF 573kb) (http://www.hmrc.gov.uk/gds/com/attachments/ct631.pdf)

A notice issued by the Group Payment Team if the nominated company does not respond to a Closure Notice within 30 days of its issue. The notice shows how HMRC will apportion payments made for the Group Payment Period (GPP) against the participating companies APs for the GPP.

FAO1848

FAO1848 (PDF 30kb) (http://www.hmrc.gov.uk/gds/com/attachments/fao1848.pdf)

A repayment document issued to the company, or its nominee, made up of both the repayment notification, and the payable order.

FAO1913

N/A

Issued by Finance to confirm to the Accounts Office or responsible CT office that a payable order has been cancelled, when the responsible CT office or Accounts Office initiate the cancellation but don’t request authority to issue a fresh payable order.

FAO1913B

N/A

Issued by Finance when they cancel a payable order and Provide authority to issue a fresh payable order.

FAO2601

N/A

Issued by Finance to confirm to Accounts Office or responsible CT office that a payable order has been cancelled, when the responsible CT office or Accounts Office initiate the cancellation and request authority to issue a fresh payable order.

INSOL200

N/A

Notification of Insolvency, issued by ICHU.

IRU1

N/A

Submission form used in Accounts Office (Cumbernauld), to refer a case to the Interest Review Unit.

MS104(CTPF)

MS104 - CTPF (PDF 10kb) (http://www.hmrc.gov.uk/gds/com/attachments/ms104_ctpf.pdf)

Return folder for use with a CT Pay and File return form (CT200).

MS104(CTSA)

MS104 - CTSA (PDF 10kb) (http://www.hmrc.gov.uk/gds/com/attachments/ms104_ctsa.pdf)

Return folder for use with a CTSA return form (CT600).

MS134

N/A

Notification from responsible CT office, of an assessment raised in an investigation case.

N1

N/A

County Court default summons form, used in Debt Management offices.

P510

N/A

Notification of a new employer, issued to the PAYE section.

PS1(BZ)

N/A

Payslip used to process remittances at Accounts Office (Shipley).

R49

N/A

Used by a Technical Caseworker in pay band grade 7, to authorise a repayment over £250,000.

R90 / R90A

N/A

Used when setting a pre CT Pay and File repayment against an unpaid liability.

R400(CT GUIDE)

N/A

List of security checks, and guidance, for the CT processing office ‘Repayment / Reallocation Authoriser’.

Numeric

Form number

Example

Description

33C/EO

N/A

Enquiry by Enforcement & Insolvency Service to responsible CT office in compulsory liquidation cases.

34/EO

N/A

Notification to responsible CT office of voluntary winding-up.

34C/EO

N/A

Enquiry by Enforcement & Insolvency Service to responsible CT office in voluntary winding-up cases.

64-8

64-8 (https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/815650/authorise_agent_64-8.pdf)

Company’s authority for agent to receive copy assessments and correspondence.

84A/EO

N/A

An ‘Absolute Stop’ notification issued by Enforcement & Insolvency Service (Worthing), where further arrears arise.

394 (Set)

N/A

Form used in Instalment Payments cases to raise a penalty, when so required.