HMRC Form 64-8: Authorising Your Agent
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JustFill is not affiliated with HM Revenue & Customs (HMRC). This is an independent third-party tool to help you complete HMRC Form 64-8. Always download the current blank form from the official source and verify your completed copy before signing or submitting. Official HMRC Form 64-8 from HM Revenue & Customs (HMRC)
HMRC Form 64-8, Authorising your agent, is the official UK HM Revenue & Customs paper and PDF form that individuals, sole traders, partnerships, trusts, and limited companies use to authorise an accountant, tax adviser, or payroll bureau to communicate with HMRC on their behalf for Self Assessment, PAYE, VAT, Corporation Tax, Tax Credits, or Construction Industry Scheme (CIS) matters. Open the Form 64-8 blank in JustFill to fill it online and download a clean PDF ready to sign and post to HMRC.
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When HMRC’s online agent authorisation handshake is unavailable — for example when a client does not have a Government Gateway login, is non-UK resident, is acting for a trust or estate, or an accountancy practice wants a signed paper authority on file — HMRC Form 64-8 ("Authorising your agent") is the standard UK tax power of attorney form. JustFill lets UK accountants, bookkeepers, payroll bureaux, and taxpayers complete Form 64-8 in the browser, save the agent’s firm details and HMRC agent codes as a reusable template, or batch-generate client onboarding packs from CSV/Excel.
The official HMRC Form 64-8 PDF is published on GOV.UK at gov.uk/government/publications/tax-credits-and-child-benefit-authorise-an-adviser-tc689/authorising-your-agent-64-8. Click the button above to open a fillable Form 64-8 blank directly in JustFill, or upload your copy to complete and download a clean PDF.
What each section of HMRC Form 64-8 asks for. JustFill’s AI will detect these fields automatically when you upload the PDF — review the breakdown below so you know what to enter.
Full name (or company/partnership/trust name), address, postcode, and daytime telephone number of the taxpayer granting authority.
Tick the boxes for Individual/Self Assessment, Company/Corporation Tax, Partnership, or Trust, and enter the National Insurance number (NINO), 10-digit Self Assessment UTR, Company Registration Number (CRN), VAT registration number, and/or Employer PAYE reference.
The accountant or tax adviser’s firm name, address, postcode, telephone number, and HMRC Agent Codes for Self Assessment (SA), Corporation Tax (CT), and PAYE.
Signed by the individual taxpayer, company director/secretary, partner, or trustee to confirm HMRC may exchange confidential tax information with the named agent.
A fictional UK limited company director authorises an accountancy firm to act for Corporation Tax, VAT, and Employer PAYE using HMRC Form 64-8.
EXAMPLE TRADING LTD · 14 SAMPLE HIGH STREET, MANCHESTER, M1 2AB
☑ Company · CRN: 01234567 · CT UTR: XXXXX 67890 · VAT Reg: GB 123 4567 89 · PAYE Ref: 120/AB12345
Identifiers are fictional and masked.
SAMPLE CHARTERED ACCOUNTANTS LLP, 88 KING STREET, MANCHESTER, M2 4WQ · CT Agent Code: A12345 · PAYE Agent Code: ZX9876
Signed by Director: J. Example · Date: 23/10/2026
These values are made up. They are here to show what belongs on each line, not to be copied — every name, number, and address on your own HMRC Form 64-8 has to be your own. Post the signed Form 64-8 to the Central Agent Authorisation Team (CAAT), BX9 1AN (or the VAT/Corporation Tax address listed on the form when filing alongside a registration).
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We load the blank HMRC Form 64-8 PDF for you — no download needed. Or upload your own copy below.
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Choose a PDF, a Word file or an image from your files, or photograph a paper form.
PDF, Word (.docx), JPG, PNG, WebP, HEIC, GIF and BMP. Instant field preview in browser — no credit card required.
First hand-filled PDF (up to 15 pages) is free with no watermark. Need more or AI Auto-Fill? Grab the $7 7-Day Pass (25 clean PDF downloads + 25 AI credits, $7 credited toward $19/mo Starter).
By uploading, you confirm you have the legal right to use this document.
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Official source: HMRC Form 64-8 on HM Revenue & Customs (HMRC)’s website
Edition checked: HMRC Form 64-8 (Authorising your agent — CAAT Longbenton). Verified against the official source on · Verified in our Government Forms Fillability Study.
JustFill is an independent product and is not affiliated with, endorsed by, or sponsored by HM Revenue & Customs (HMRC) or any government agency. Always verify your completed form on the official version before signing or submitting.