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NO

As of 13 August 2026, AI cannot submit your CIS monthly return.

This still needs a person who signs their name to it.

Can you do it?

15 minutesto a draft.

n/ait cannot be self-verified.

Cost, all in£0

Skill neededchat-fluent

Who has to check ita professional

What the alternative costsThe supplied tool list includes no CIS filing service and gives no price for an alternative.

If the return is wrong or late, HMRC can hold your business responsible even when AI helped prepare it.

What to actually do

  1. Hand it to a person

    The route this page recommends

    Someone with a licence or accountable authority has to sign this before it counts.

  2. Use a tool built for this

    Second choice

  3. Do it yourself

    The distant third

    A chat interface gets you a draft, but you cannot verify it yourself. That is the catch.

    How to actually do it

    1. Open the current CIS monthly return guidance and the CIS online service on GOV.UK, and keep both available while you work.
    2. Gather the business payroll and subcontractor records for the relevant month, including payment records, invoices, materials information, verification details and deduction records where applicable.
    3. Remove HMRC passwords, Government Gateway credentials, bank details and unnecessary personal identifiers, then paste the remaining records and the current HMRC guidance into the prompt.
    4. Ask the chatbot to produce the preparation checklist, map each figure to the return and flag every missing or uncertain item without estimating anything.
    5. Compare each drafted figure with the original payroll, invoice and payment records, and ask an accountant or payroll specialist to resolve any status, deduction or CIS treatment the chatbot flags.
    6. Open the HMRC CIS online service, enter the checked figures yourself, compare the on-screen return with the signed-off records, and submit it only when the responsible person is satisfied.

    Prompt

    Help me prepare, but not submit, a UK Construction Industry Scheme monthly return for [business name] for [return month]. Use only the records and current GOV.UK or HMRC guidance that I provide. First list the information and documents needed, then map each supplied figure to the relevant part of the return, identify missing or inconsistent records, and produce a clear preparation checklist. Do not guess figures, contractor status, deductions, materials, verification details or deadlines. Do not decide whether a payment is within CIS without explaining what current HMRC guidance is needed to confirm it. Mark every item that needs checking by me or an accountant. Do not request or reproduce my HMRC password, Government Gateway credentials or full bank details. End with a list of the exact checks I must complete in the HMRC online service before I submit the return myself.

    Open it prefilled in ChatGPT or Claude, or copy it into Gemini, which takes no prefill link.

What it gets wrong

  • AI cannot log in to your HMRC account or take responsibility for the submission.
  • AI cannot establish every CIS status or payment treatment from incomplete records.
  • AI cannot guarantee that its interpretation reflects the current HMRC rules for your circumstances.
  • AI cannot verify confidential payroll and subcontractor information independently.
  • The business remains liable for an incorrect or late return.

What makes this a NO: legal accountability, private data access and verification cost.

How we scored this

Five axes, each scored nought to two by hand: ten means AI carries the task cleanly, and the thresholds that turn a total into YES, PARTLY or NO are published in the methodology. Each axis name links to its definition.

AxisScore (0–2)
Output1
Inputs1
Verification0
Liability0
Effort delta1
Total3 / 10

The methodology and its thresholds are published in full.

FAQ

Can AI submit my CIS monthly return?
No. AI can organise records and prepare a checklist, but you or an accountable professional must check and submit the return through HMRC. This is not professional advice; a serious or unclear case needs an accountant or payroll specialist.
Can ChatGPT file a CIS return for me?
No. ChatGPT can help map your records to the information needed for a CIS return, but it does not take responsibility for the figures or reliably complete your HMRC account submission.
What information does AI need to prepare a CIS return?
It needs the relevant business and subcontractor payment records, verification information, invoices, materials details and deduction records needed for that return. Remove passwords, Government Gateway credentials, bank details and unnecessary personal data before sharing anything.
Do I still need an accountant for a CIS return?
You may not need one for a straightforward return if you understand the rules and can check every figure against your records. Use an accountant or payroll specialist when contractor status, deductions, disputed payments or incomplete records make the treatment uncertain.

Nearby answers

All Regulatory filings rulings

Assessed by gpt-5.6-luna (gpt-5.6-luna) on 2026-08-13, second-checked by an independent model. Wrong somewhere? Email [email protected] and it gets re-checked.

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