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NO

As of 13 August 2026, AI cannot check if your tax bill is correct.

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 costsNo priced alternative is provided in the available tool information.

If this goes wrong, you may accept an incorrect tax calculation or miss an amount owed, leaving you to resolve the position with HMRC and pay any resulting liability.

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 HMRC tax calculation or bill and note the tax year, income sources, tax deducted, allowances, reliefs, payments already made, and amount shown as due.
    2. Gather the matching records, such as payslips, P60 or P45 information, pension records, bank interest records, dividend statements, Self Assessment figures, and proof of payments to HMRC.
    3. Remove unnecessary personal identifiers from the documents, then paste the relevant figures and wording into the prompt, keeping the tax year and the calculation sections together.
    4. Ask the chatbot to reconcile each HMRC figure against your records and to separate arithmetic differences from questions about whether a tax rule applies.
    5. Compare every flagged difference with the relevant current GOV.UK guidance and the original HMRC notice, without treating the chatbot's explanation as confirmation of the rule.
    6. Send the discrepancy and your supporting records to HMRC through its official contact route, or ask a UK tax adviser or accountant to check the calculation where you cannot verify the rule yourself.

    Prompt

    I want help checking an HMRC tax calculation, not a definitive tax opinion. Use only the information I provide and do not guess, invent figures, or assume a tax year, allowance, relief, income source, payment, or deadline. First list the tax year and every figure shown in the HMRC calculation. Then reconcile those figures against my records, show the arithmetic in plain language, identify any differences, and list the information that is missing. Separate arithmetic checks from questions about whether a UK tax rule applies. For each possible error, explain what I should verify on GOV.UK or with HMRC. Do not tell me that the bill is definitely correct or definitely wrong. State clearly that this is not professional advice and recommend a UK tax adviser or accountant if the discrepancy affects a material amount, involves several income sources, self-employment, property, overseas income, capital gains, or a dispute with HMRC. My tax year: [tax year]. The HMRC calculation or notice: [paste it here]. My supporting figures and records: [paste only relevant figures here].

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

What it gets wrong

  • AI cannot see HMRC's complete record of your income, payments, coding notices, amendments, or correspondence.
  • AI cannot reliably decide whether a relief, allowance, exemption, or income treatment applies to your circumstances.
  • AI cannot replace HMRC's confirmation or a tax adviser or accountant's professional judgement on a disputed calculation.
  • The liability remains yours if you accept the wrong bill, delay payment, or give HMRC incorrect information.
  • A neat reconciliation can still be based on a missing document or an incorrect assumption about the tax year.

What makes this a NO: legal accountability, regulated advice 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 check if my HMRC tax bill is correct?
No, not reliably. AI can reconcile the figures you provide and identify apparent differences, but you cannot use it as confirmation that HMRC applied the right tax rules to your circumstances.
What documents should I give AI to check my tax bill?
Give it the HMRC calculation or notice, the tax year, and matching records for income, tax deducted, allowances, reliefs, and payments already made. Remove unnecessary personal identifiers and do not let it fill gaps by guessing.
Can AI explain why my tax bill has changed?
It can compare two calculations or notices and suggest which figures changed. Check the explanation against GOV.UK and HMRC, because the model may miss an amendment, coding change, payment allocation, or tax rule.
Who should check my tax bill if I think HMRC is wrong?
Contact HMRC with the notice and your supporting records for an administrative or calculation query. For a serious dispute or a case involving self-employment, property, overseas income, capital gains, or several income sources, use a UK tax adviser or accountant; this is not professional advice.

Nearby answers

All Tax returns & HMRC 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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