Amended Tax Returns

If you've already filed your tax return and realised you made a mistake, don't panic. You can amend it—HMRC lets you correct errors and update information within certain timeframes. You can amend your tax return within 12 months of the statutory filing date (31 January) (gov.uk change your return). For online amendments, you must wait 72 hours after filing before you can make changes. If you miss the 12-month deadline, you must write to HMRC with calculations and a claim for overpayment relief (if applicable). Overpayment relief can be claimed up to 4 years after the end of the tax year it relates to.

The problem is most people don't know they can amend returns, or they think it's too complicated. They worry about penalties, don't understand the deadlines, or think they're stuck with mistakes. That causes problems—overpaid tax you can't recover easily, underpaid tax that gets discovered later with interest and penalties, and stress from thinking you can't fix things.

We handle amended tax returns for people who've made mistakes or discovered errors: Self Assessment amendments (correcting income, expenses, or tax calculations on Self Assessment returns), Corporation Tax amendments (amending CT600 returns for limited companies), deadline management (ensuring amendments are submitted within the 12-month deadline or following late procedures), overpayment relief claims (claiming refunds for overpaid tax if you missed the amendment deadline), and HMRC correspondence (responding to HMRC's proposed amendments and negotiating corrections). Whether you're in Medway and discovered you missed some expenses, in Maidstone with incorrect income figures, or in Canterbury needing to claim overpayment relief, we'll handle your amended tax returns that get things right. No stress, no complications—just practical help to correct your return properly.

What this helps you do (fast)

• Correct mistakes in your tax return — Fix errors in income, expenses, or tax calculations quickly and properly. Accurate returns mean you pay the right amount of tax.
• Claim refunds for overpaid tax — If you overpaid tax due to errors, we'll help you claim refunds through amendments or overpayment relief. Getting refunds back means money in your pocket.
• Avoid penalties and interest — Correcting errors before HMRC discovers them helps avoid penalties and interest charges. Early correction means fewer problems down the line.
• Meet amendment deadlines — Ensure amendments are submitted within the 12-month deadline or follow proper procedures for late amendments. Meeting deadlines means easier processing and faster refunds.
• Handle HMRC proposed amendments — If HMRC proposes changes to your return, we'll help you understand and respond appropriately. Proper responses protect your position.
• Stay compliant and accurate — Keeping your tax returns accurate means you're compliant with HMRC requirements and avoid future enquiries. Compliance means peace of mind.

How it works

Step-by-step process for amended tax returns:

1. Discovery call — We chat about your situation: what mistake you found, which tax year it affects, whether you've already filed, how much tax it affects, and what you want to achieve.
2. Assessment of the error — We assess what needs correcting:
   • Identify the error — Work out exactly what's wrong (missing income, incorrect expenses, wrong calculations, etc.)
   • Calculate the impact — Work out how much tax it affects (overpayment or underpayment)
   • Check the deadline — Confirm whether you're within the 12-month amendment deadline or need to use late procedures
   • Review options — Consider whether to amend online, by paper, or write to HMRC
   • Assess documentation — Check if you have supporting documents for the correction
   Assessment helps us understand what needs fixing and the best way to do it.
3. Gather supporting information — We gather information to support the amendment:
   • Original return details — Review what was originally filed (copies of returns, HMRC acknowledgements)
   • Correct information — Gather correct income figures, expense receipts, or other supporting documents
   • Calculations — Prepare calculations showing the correction and new tax liability
   • Explanations — Prepare clear explanations of why the amendment is needed
   • Supporting evidence — Gather receipts, invoices, bank statements, or other documents supporting the correction
   Information gathering ensures we have everything needed to justify and process the amendment correctly.
4. Prepare the amendment — We prepare your amended return:
   • Complete amended pages — Fill in the pages that need correcting (income, expenses, tax calculations)
   • Mark clearly as "AMENDMENT" — Ensure all amended pages are clearly marked (especially for paper amendments)
   • Include calculations — Show clearly how the correction affects your tax liability
   • Prepare explanations — Write clear explanations of the correction and why it's needed
   • Check completeness — Ensure the amendment is complete and accurate before submission
   Amendment preparation ensures the correction is clear, accurate, and properly documented.
5. Submit the amendment — We submit your amended return:
   • Online submission — If within 12 months and after the 72-hour wait, submit via HMRC's online portal
   • Paper submission — If you filed by paper originally, submit amended pages by post (clearly marked "AMENDMENT")
   • Written request — If after the 12-month deadline, write to HMRC with calculations and overpayment relief claim if applicable
   • Submission confirmation — Get confirmation from HMRC that the amendment has been received
   • Follow-up — Monitor the amendment processing and respond to any HMRC queries
   Amendment submission ensures your correction reaches HMRC through the correct channel and is processed properly.
6. Handle refunds or additional payments — If the amendment changes your tax liability:
   • Refund processing — If you overpaid tax, arrange refund through HMRC (electronic transfer or cheque)
   • Additional payment — If you underpaid tax, calculate additional tax due and arrange payment (including interest if applicable)
   • Payment arrangements — If you can't pay immediately, arrange a time to pay plan with HMRC
   • Confirmation — Get confirmation from HMRC that refunds have been issued or payments received
   • Reconciliation — Reconcile your tax position to ensure everything is correct
   Handling refunds or payments ensures your tax position is settled correctly after the amendment.

We handle all aspects of amended tax returns. The key is identifying errors correctly, calculating the impact accurately, submitting amendments within deadlines or following late procedures properly, and handling refunds or payments, so you get your tax position right.

Costs & timelines

Pricing factors:

• Complexity of error — Simple errors (single income or expense correction) cost less than complex errors (multiple corrections, complex calculations)
• Amendment method — Online amendments (within 12 months) are quicker and cost less than late amendments requiring written requests
• Tax impact — Larger tax corrections may require more work (detailed calculations, HMRC correspondence)
• Number of tax years — If you need to amend multiple tax years, costs increase accordingly
• Overpayment relief claims — Late amendments with overpayment relief claims require more work (written requests, detailed documentation)

Commonly reported ranges by local providers:

• Simple amendment (within 12 months): £100–£250 for straightforward corrections (single income/expense error, online submission)
• Standard amendment (within 12 months): £200–£400 for typical corrections (multiple errors, some calculations, online/paper submission)
• Complex amendment (within 12 months): £300–£600 for complex corrections (multiple tax years, complex calculations, detailed documentation)
• Late amendment (after 12 months): £300–£600 for late amendments requiring written requests and overpayment relief claims
• HMRC correspondence: £150–£300 for responding to HMRC's proposed amendments or queries about your amendment

Why amended tax return filing costs what it does:

• Error assessment requires time to identify mistakes, calculate impact, and determine best amendment method
• Information gathering requires collecting original returns, correct information, and supporting documents
• Amendment preparation requires completing amended pages, calculations, and clear explanations
• Submission management requires understanding deadlines, submission procedures, and following up with HMRC
• Refund or payment handling requires coordinating with HMRC and ensuring tax position is settled correctly

Timeline: For amendments within the 12-month deadline, we aim to prepare and submit within 1-2 weeks from when we receive all your information. For late amendments (after 12 months), written requests may take 2-3 weeks to prepare, and HMRC processing typically takes 4-8 weeks. Refunds are usually issued within 4-6 weeks of HMRC processing the amendment.

Payment: If the amendment results in additional tax due, payment should be made as soon as possible to avoid interest charges. HMRC charges interest on underpaid tax from the original payment deadline. If you can't pay immediately, we can help arrange a time to pay plan. If you're due a refund, HMRC will issue it automatically after processing the amendment.

No hidden fees. Amendment price includes assessment, information gathering, amendment preparation, submission, and initial refund/payment coordination. Ongoing HMRC correspondence or complex overpayment relief claims are separate if needed.

Kent (UK) focus

We work with people across Kent who've discovered errors in their tax returns: people in Medway who missed some expenses, people in Maidstone with incorrect income figures, and people in Canterbury needing to claim overpayment relief.

Kent taxpayers face the same amendment deadlines and procedures as everyone else—12-month amendment deadlines, 72-hour online wait periods, and late amendment procedures. The difference is when you get proper help with amended tax returns, you correct errors quickly, meet deadlines, and handle refunds or payments properly. That's what helps Kent taxpayers get their tax position right and avoid future problems.

Common Kent amendment scenarios:

• Missing expenses — Self-employed people who forgot to claim allowable business expenses
• Incorrect income — People who missed income or reported wrong figures
• Calculation errors — People who made mistakes in tax calculations or relief claims
• Overpayment relief — People who overpaid tax and need to claim refunds after the amendment deadline
• HMRC proposed amendments — People responding to HMRC's proposed changes to their returns

Kent business market context:

• Many Kent taxpayers are self-employed or run businesses requiring accurate tax returns
• Amendment help helps Kent taxpayers correct errors and claim refunds for overpaid tax
• Proper amendment handling helps Kent taxpayers avoid penalties and stay compliant
• Time to pay arrangements help Kent taxpayers manage additional tax payments if needed

Remote-first, Kent-focused. We don't need to meet in person (though we can if you prefer), and we understand what Kent taxpayers are dealing with. Amendment deadlines, error corrections, refund claims, payment arrangements—we'll handle your amended tax returns that get things right without stress.

FAQs