My records or calculation are wrong
Correct the underlying evidence or record first, rebuild every derived figure, and keep the old version connected to the correction. Never edit an authority receipt into saying something new.
Put it right · power to challenge
A mistake is not the end of the road.
Correct your own records, amend a return, challenge a decision, complain about service, or ask for help paying. The right route depends on what is wrong, so TaxSorted keeps correction, appeal, complaint and payment support separate.
01 · Choose the right route
What needs putting right?
I need to amend a filed return
HMRC says a filed Self Assessment return can normally be corrected within 12 months of the filing deadline. VAT errors have their own amount, period and deliberate-error rules. Check the tax, period and current instructions before acting.
I disagree with an HMRC decision or penalty
Read the decision letter first. It says whether and how to appeal. HMRC says the deadline is usually 30 days; a statutory review is carried out by a different officer, and tribunal rights may remain afterward.
I cannot pay on time
Do not turn silence into a plan. HMRC may agree monthly instalments based on the tax, your circumstances and affordability. Contacting HMRC and agreeing Time to Pay does not erase the tax or necessarily stop interest.
HMRC’s service was the problem
A complaint is for service failures such as delay, communication or case handling. It is not a substitute for an appeal against the tax or penalty itself. HMRC’s complaint route has first- and second-tier review stages.
I need extra support or another person to help
Health, disability, financial hardship or personal circumstances can change how help should be provided. Authority for someone to speak with HMRC is separate from authority to edit records, file, pay or conduct a dispute.
I have not declared some income
Use HMRC’s disclosure route rather than trying to make later records look as if the income was always present. The correct route depends on the tax, years involved and whether a return was already filed.
02 · Build the evidence pack
Make the disagreement inspectable.
- The decision, penalty, return or receipt exactly as received
- A short timeline: what happened, when, and who said what
- The facts and records that support the figure you say is right
- Your calculation, assumptions, sources and the tax period involved
- Copies of messages, letters, submissions and delivery acknowledgements
- The remedy you are asking for, stated plainly