If you discover an error on a VAT return you've already submitted, you must correct it. How you correct the error depends on its size - smaller errors can be adjusted on your next return, while larger errors must be reported separately to HMRC.

Correcting errors promptly and voluntarily typically results in lower penalties than if HMRC discovers the error themselves. This guide explains the rules so you can fix mistakes correctly and avoid unnecessary penalties.

Types of VAT return errors

Errors on VAT returns generally fall into these categories:

Over-claimed input tax - you reclaimed more VAT on purchases than you were entitled to
Under-declared output tax - you didn't charge or report enough VAT on sales
Under-claimed input tax - you didn't reclaim VAT you were entitled to
Over-declared output tax - you reported too much VAT on sales
Wrong box entries - figures entered in the wrong box (for example, including VAT in boxes 6-9 which should exclude VAT)
Timing errors - transactions included in the wrong VAT period

The first two error types mean you owe HMRC money. The second two mean HMRC owes you. All errors should be corrected, but errors in HMRC's favour are obviously less urgent.

Common mistakes that lead to errors

Understanding what causes VAT return errors helps you avoid them in future:

Common VAT return errors to avoid

Frequent mistakes businesses make when completing VAT returns and how to avoid them.

Including VAT in boxes 6-9: Error: Including VAT-inclusive figures. Correct: All values must exclude VAT
Claiming blocked input tax: Error: Reclaiming VAT on business entertainment or private use. Correct: Exclude blocked items from box 4
Missing invoices: Error: Claiming input tax without valid VAT invoice. Correct: Only reclaim with proper documentation
Wrong tax point: Error: Including sales in wrong period. Correct: Use invoice date or delivery date as appropriate
Omitting zero-rated sales: Error: Not including exports in box 6. Correct: Include all sales regardless of VAT rate
Double-counting EU boxes: Error: Forgetting to include box 8/9 figures in boxes 6/7. Correct: EU figures appear in both
Reverse charge errors: Error: Not accounting for reverse charge on overseas services. Correct: Include in both box 1 and box 4
Cash accounting mismatch: Error: Mixing cash and invoice accounting. Correct: Use one method consistently

Correcting errors

Errors up to £10,000 (or 1% of turnover if greater, up to £50,000) can be corrected on your next VAT return. Larger errors must be disclosed to HMRC separately using form VAT652.

Deliberate errors or repeated mistakes may result in penalties.

How to fill in and submit your VAT Return (VAT Notice 700/12)

Error correction thresholds

The method you use to correct an error depends on the net value of all errors you've discovered on previous returns. The net value is the total of all errors added together (some may cancel each other out).

Threshold for adjusting next return: Net error of £10,000 or less
Alternative threshold: Net error between £10,000 and £50,000 AND less than 1% of Box 6 figure
Larger errors: Must report separately to HMRC (cannot adjust on next return)
Box 6 figure: Total value of sales excluding VAT for the period in which you discover the error

Working out if you're within the threshold

To determine which correction method to use:

Calculate the net value of all errors you've discovered (add together increases and decreases in VAT owed)
If the net error is £10,000 or less - you can adjust your next return
If the net error is between £10,000 and £50,000 - check if it's less than 1% of your Box 6 figure for the current period
If the net error exceeds £50,000, or is more than 1% of Box 6 turnover - you must notify HMRC separately

Example: You discover you under-claimed £8,000 input tax and over-declared £3,000 output tax. The net error is £11,000 (in your favour). Your current period Box 6 is £1,500,000. 1% of £1,500,000 = £15,000. Since £11,000 is less than £15,000 AND less than £50,000, you can adjust on your next return.

Correcting small errors on your next return

If your error is within the threshold, you can correct it by adjusting the relevant boxes on your next VAT return. This is the simplest method.

Calculate the net adjustment needed

Work out the total VAT effect of all errors. If you owed more VAT than you reported, the adjustment increases your VAT liability. If you were owed VAT, it decreases your liability.
Adjust Box 1 for output tax errors

If you under-declared sales VAT, add the correction to Box 1. If you over-declared, reduce Box 1. Your software may have an adjustment field.
Adjust Box 4 for input tax errors

If you under-claimed purchase VAT, add the correction to Box 4. If you over-claimed, reduce Box 4.
Adjust Boxes 6 and 7 if applicable

If the error affected the net values of sales or purchases (not just the VAT), also adjust Boxes 6 and 7.
Keep a record of the correction

Document what errors you corrected, when they occurred, and how you calculated the adjustment. HMRC may ask to see this evidence.

Important: Even when correcting errors on your next return, you should keep clear records showing what the errors were, which periods they affected, and how you calculated the correction. HMRC can enquire into any return for up to 4 years.

Correcting larger errors (voluntary disclosure)

If your error exceeds the threshold for adjusting on your next return, you must report it separately to HMRC. This is called a voluntary disclosure or error notification.

You can also choose to make a voluntary disclosure even for smaller errors - for example, if you want a formal record that you've corrected the error.

How to make a voluntary disclosure

Since April 2024, you can no longer use form VAT652. Instead, you must report errors online or in writing.

Use the online error correction service

Sign in to your Government Gateway account and use the 'Check how to tell HMRC about VAT Return errors' service. Answer the questions to generate a disclosure.
Or write to HMRC

Send a letter to: HM Revenue and Customs, VAT Error Correction Team, BX9 1WR. Include your VAT registration number and all error details.
Include all required information

Your disclosure must state: the VAT periods affected, the amount of each error, whether the error is in HMRC's favour or yours, and how the error occurred.
Pay any VAT owed promptly

If you owe HMRC money, pay it as soon as possible. Interest accrues from when the VAT was originally due. Prompt payment may reduce penalties.
Wait for HMRC's response

HMRC will confirm receipt and may ask questions. If you owe money, they'll issue an assessment. If they owe you, they'll process the repayment.

Online service: Check how to tell HMRC about VAT Return errors (via Government Gateway)
Postal address: HM Revenue and Customs, VAT Error Correction Team, BX9 1WR
Processing time: HMRC aims to respond within 30 days of receiving a complete disclosure

Time limits for correcting errors

You can correct errors from VAT returns submitted in the previous 4 years, measured from the end of the VAT period in which the error occurred.

Standard time limit: 4 years from the end of the VAT period containing the error
Error in your favour: You can reclaim under-claimed VAT for up to 4 years
Error in HMRC's favour: You must correct over-claimed VAT - HMRC can assess for up to 4 years
Deliberate errors: HMRC can assess for up to 20 years if error was deliberate

Example: You discover an error from your VAT return for the quarter ending 31 March 2023. The 4-year limit runs from 31 March 2023, so you have until 31 March 2027 to correct this error.

For errors in your favour (where you didn't claim VAT you were entitled to), there's no obligation to claim the refund - but it makes commercial sense to do so within the time limit.

Penalties for VAT errors

Penalties for VAT errors depend on whether the error was careless, deliberate, or simply a genuine mistake - and whether you disclosed it voluntarily or HMRC discovered it.

Reasonable care taken: No penalty for genuine mistakes if you took reasonable care
Careless error (unprompted disclosure): 0% to 30% of the extra tax due
Careless error (prompted by HMRC): 15% to 30% of the extra tax due
Deliberate error (unprompted disclosure): 20% to 70% of the extra tax due
Deliberate error (prompted by HMRC): 35% to 70% of the extra tax due
Deliberate and concealed (unprompted): 30% to 100% of the extra tax due
Deliberate and concealed (prompted): 50% to 100% of the extra tax due

Why voluntary disclosure matters

The penalty ranges show that voluntary (unprompted) disclosure always results in a lower maximum penalty than if HMRC discovers the error themselves. An unprompted disclosure is one you make before HMRC gives any indication they intend to check your returns.

Once HMRC writes to you about a check or sends an enquiry letter, any disclosure becomes 'prompted' and the penalty range increases.

Appealing a penalty

If HMRC issues a penalty, you may be able to appeal if you have a reasonable excuse:

VAT penalty reasonable excuse provisions

Grounds for appealing VAT penalties based on reasonable excuse, and how to apply.

You may avoid a VAT penalty if you have a reasonable excuse for late submission or payment. HMRC considers each case individually based on the specific circumstances.

Appeal deadline: 30 days from the penalty notice date
First step: Request a review from HMRC
Second step (if review unsuccessful): Appeal to the Tax Tribunal
Tribunal fee: Free for penalties under £20,000

What counts as a reasonable excuse

HMRC may accept these as reasonable excuses:

Serious illness or bereavement affecting you or a close relative
Unexpected hospital admission
Fire, flood, or other disaster preventing compliance
HMRC service issues (delays in processing, technical failures)
Postal delays (for paper returns, if applicable)

What does NOT count as a reasonable excuse

Relying on an agent who failed to submit or pay on time
Lack of funds (except in exceptional circumstances)
Not receiving a reminder from HMRC
Pressure of work or other commitments
Failure to keep proper records

Important: Even with a reasonable excuse, you must rectify the situation as soon as the excuse ends. Continued delay after circumstances improve will not be excused.

Penalty points and penalties if you submit your VAT return late

What happens if you don't correct errors

Failing to correct known errors on your VAT returns is risky. HMRC may:

Discover the error during a VAT inspection or desk-based review
Cross-reference your returns against other data (supplier returns, bank records, customs declarations)
Assess additional VAT plus interest from when it was originally due
Charge higher penalties (prompted disclosure rates)
In serious cases, pursue criminal prosecution for fraud

Interest on underpaid VAT accrues from the date the VAT was originally due, regardless of when the error is corrected. The longer you wait, the more interest accumulates.

Interest on late VAT

When you correct an error that means you owe HMRC additional VAT, interest is charged from when the VAT was originally due.

Interest rate: Bank of England base rate plus 2.5%
Calculation: Simple interest (not compounded) calculated daily
Start date: Day after the original payment due date
End date: Day you pay the corrected amount

Interest applies to all late VAT, regardless of whether the error was careless, deliberate, or an innocent mistake. It's not a penalty - it compensates HMRC for having the use of money that should have been paid earlier.

If HMRC owes you money

When you correct an error that means HMRC owes you VAT (for example, you under-claimed input tax), you're entitled to a refund. However, you won't receive interest on historical underclaims - the refund only covers the VAT amount itself.

Once HMRC agrees the refund, they should pay within 30 days. If they take longer without good reason, you may be entitled to repayment interest.

Record keeping for error corrections

Whenever you correct a VAT error, keep detailed records showing:

The VAT period(s) the error affected
The nature of the error and how it happened
How you calculated the correction
The date you made the correction
The method used (adjustment on return or voluntary disclosure)
Any correspondence with HMRC

Keep these records for at least 6 years. HMRC may ask to see evidence of how you corrected errors during a VAT inspection.

Getting help with VAT errors

If you're unsure how to correct an error, or the error is complex, consider getting professional help. An accountant or VAT specialist can:

Calculate the correct adjustment
Advise on the best correction method
Help prepare a voluntary disclosure
Negotiate with HMRC on penalties
Represent you if HMRC raises an enquiry

The cost of professional advice is often worthwhile for larger errors or complex situations, particularly if penalties may apply.

Related VAT penalties

Errors on VAT returns may also interact with the penalty regime for late submission and late payment. Understanding these helps you manage your overall compliance.

Late submission penalties

VAT late submission penalties

Points-based penalty system for late VAT returns, including point thresholds by filing frequency and penalty amounts.

From 1 January 2023, HMRC uses a points-based penalty system for late VAT returns. Each late submission adds a penalty point to your account. When you reach the threshold for your filing frequency, you receive a £200 penalty and continue to receive £200 for each subsequent late submission until points are reset.

Penalty amount (at threshold): £200 per late submission
Points threshold (annual returns): 2 points
Points threshold (quarterly returns): 4 points
Points threshold (monthly returns): 5 points
Points expiry period: 24 months of timely submissions after reaching threshold
Effective date: VAT periods starting on or after 1 January 2023

How points accumulate

You receive one penalty point for each VAT return submitted late. Points accumulate separately from financial penalties:

Below threshold: No financial penalty, but points remain on your record
At threshold: £200 penalty for the late return that triggered the threshold
Above threshold: £200 for every subsequent late return until points reset

Resetting points to zero

To reset your points after reaching the threshold, you must:

Submit all outstanding returns
Submit all returns on time for a 24-month period of compliance

If you have not reached the threshold, points expire 24 months after they were incurred (provided you have no further late submissions).

Penalty points and penalties if you submit your VAT return late

Late payment penalties

VAT late payment penalties

Penalty structure for late VAT payments, including first and second penalty charges and daily interest rates.

From 1 January 2023, late payment of VAT incurs two separate penalties plus interest. The system operates differently to the points-based late submission regime.

First 15 days late: No penalty (but interest accrues from day 1)
16 to 30 days late: 2% of VAT outstanding at day 15
Over 30 days late (first penalty): 2% of VAT outstanding at day 15 PLUS 2% of VAT outstanding at day 30
Over 30 days late (second penalty): 4% per year (calculated daily on outstanding balance)
Late payment interest rate: Bank of England base rate plus 2.5% (calculated daily from due date)
Effective date: VAT periods starting on or after 1 January 2023

Understanding the two penalty structure

First penalty: A fixed charge based on percentage of outstanding VAT:

Paid within 15 days: No penalty
Paid between 16-30 days: 2% of what you owed at day 15
Paid after 30 days: 2% (day 15) + 2% (day 30) = 4% of outstanding VAT

Second penalty: An ongoing daily charge (annualised at 4%) that accrues from day 31 until you pay in full. This is in addition to the first penalty.

Late payment interest

Interest is charged from day 1 after the due date at the Bank of England base rate plus 2.5%. This is separate from penalties and applies to all late payments.

Interest calculation basis: Daily simple interest (not compounded)
Interest start date: Day after the payment due date
Current interest rate (January 2026): Check HMRC website for current Bank of England base rate plus 2.5%

Penalty points and penalties if you submit your VAT return late

Check how to tell HMRC about VAT Return errors

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Correct VAT return errors

Types of VAT return errors

Common mistakes that lead to errors

Error correction thresholds

Working out if you're within the threshold

Correcting small errors on your next return

Calculate the net adjustment needed

Adjust Box 1 for output tax errors

Adjust Box 4 for input tax errors

Adjust Boxes 6 and 7 if applicable

Keep a record of the correction

Correcting larger errors (voluntary disclosure)

How to make a voluntary disclosure

Use the online error correction service

Or write to HMRC

Include all required information

Pay any VAT owed promptly

Wait for HMRC's response

Time limits for correcting errors

Penalties for VAT errors

Why voluntary disclosure matters

Appealing a penalty

What happens if you don't correct errors

Interest on late VAT

If HMRC owes you money

Record keeping for error corrections

Getting help with VAT errors

Related VAT penalties

Late submission penalties

Late payment penalties

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Types of VAT return errors

Common mistakes that lead to errors

Error correction thresholds

Working out if you're within the threshold

Correcting small errors on your next return

Calculate the net adjustment needed

Adjust Box 1 for output tax errors

Adjust Box 4 for input tax errors

Adjust Boxes 6 and 7 if applicable

Keep a record of the correction

Correcting larger errors (voluntary disclosure)

How to make a voluntary disclosure

Use the online error correction service

Or write to HMRC

Include all required information

Pay any VAT owed promptly

Wait for HMRC's response

Time limits for correcting errors

Penalties for VAT errors

Why voluntary disclosure matters

Appealing a penalty

What happens if you don't correct errors

Interest on late VAT

If HMRC owes you money

Record keeping for error corrections

Getting help with VAT errors

Related VAT penalties

Late submission penalties

Late payment penalties

Related guides in Tax & Finance

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