How to amend a quarterly update to HMRC

If you submit a quarterly update to HMRC and later find an error — a missing expense, a wrong amount, or a miscategorised transaction — you can amend the submission. This guide explains how amendments work and how to do it in TenancyVault. Reviewed May 2026.

When to amend a quarterly update

Amend a quarterly update when:

• You discover a transaction was missing from your records when you filed
• A transaction was categorised incorrectly and the amount should be in a different expense category
• An amount was entered incorrectly
• You included a personal transfer as an expense by mistake
• You forgot to include a rental income payment

You do not need to amend for very small errors where the tax impact is negligible, but it is good practice to keep your quarterly figures as accurate as possible.

What an amendment does

An amendment replaces your original submission with corrected figures. HMRC receives the updated income and expense totals for the quarter. The original submission is effectively superseded.

How to amend in TenancyVault

1. Go to the quarterly records for the quarter you need to correct
2. Make the necessary changes — add the missing transaction, correct the amount, or re-categorise the entry
3. Use the amend option for the submitted quarter
4. Review the updated totals
5. Submit the amendment to HMRC

TenancyVault sends the corrected figures to HMRC. You can then retrieve the updated HMRC calculation to confirm the amendment has been processed.

Timing

You can amend a quarter after its deadline has passed. There is no short window for amendments — you can correct a quarter from a previous period if needed.

However, amendments should be made promptly. If an error is carried through multiple quarters — for example, a recurring expense that was consistently miscategorised — you will need to amend each affected quarter separately.

What amendments cannot fix

• Deliberately inaccurate submissions — amendments are for genuine mistakes, not attempts to change figures after the fact for non-business reasons
• End-of-year errors — some adjustments are made at the final declaration stage rather than by amending quarterly updates

If you are unsure whether your situation needs an amendment or professional advice, consult a qualified accountant or tax adviser.

Common mistakes

• Waiting until year-end to correct quarterly errors — it is better practice (and simpler) to amend a quarter as soon as you identify the error
• Not checking whether the amendment was accepted — after submitting an amendment, retrieve the HMRC calculation to confirm the figures were updated correctly
• Amending the wrong quarter — check the dates carefully; an expense from October that was wrongly omitted needs to be added to Q2 (July–October), not Q3

Not legal or tax advice. This guide is for information only. Consult a qualified accountant or tax adviser for guidance on your specific situation.