Late Receipts and Missing Invoices: Which Quarter Does It Go In?

The Receipt Arrived Late. Now What?

You file your quarterly update, breathe a sigh of relief - and then a supplier invoice lands in your inbox three weeks later. Or your accountant flags a missing receipt from two months ago. Or you find a crumpled petrol receipt in your coat pocket that should have gone in last quarter.

This happens to almost every sole trader and landlord at some point. The question is simple but the answer has a few moving parts: which quarter does the expense actually belong in, and do you need to go back and amend anything? This guide walks you through both questions, with a clear decision tree and step-by-step workflows for each situation.

The Core Rule: Date of Incurrence, Not Date of Receipt

HMRC's rule is straightforward. An expense belongs to the period in which you actually incurred it - not the date the invoice arrived, not the date you paid it, and not the date you found the receipt.

If you bought materials in April and the invoice arrived in July, the expense belongs in Q1 (April to June). If a direct debit for your business insurance came out in May but you only noticed it in August, it still belongs in Q1.

This matters because your quarterly updates are meant to reflect your actual trading activity for that period. Putting an April expense into your Q3 update just because you found it late is technically incorrect - even if the total tax you pay across the year works out the same.

Which Quarter Is Which?

Before going further, here are the four quarterly periods for MTD Income Tax, along with their filing deadlines:

• Q1: 6 April to 5 July - deadline 7 August
• Q2: 6 July to 5 October - deadline 7 November
• Q3: 6 October to 5 January - deadline 7 February
• Q4: 6 January to 5 April - deadline 7 May

When you discover a late receipt or missing invoice, the first thing to establish is: which quarter does the expense date fall in? That tells you which update - if any - needs adjusting.

The Decision Tree: Amend or Include Next Quarter?

Once you know which quarter the expense belongs to, work through these questions in order:

Step 1: Has that quarter's update already been filed?

If the answer is no - you have not yet filed the update for the quarter the expense belongs to - this is easy. Just add the expense to your records before you file. No amendment needed. Nothing unusual to do.

If the answer is yes, move to Step 2.

Step 2: Is the missing amount significant?

There is no official HMRC threshold for what counts as "significant", but a practical way to think about it:

• A few pounds - a parking receipt, a small stationery purchase - is unlikely to be worth the effort of an amendment unless you are close to a tax boundary.
• A larger amount - a supplier invoice for several hundred pounds, a quarterly subscription you missed, a significant materials cost - is worth correcting in the right period.
• If the missing expense would meaningfully change your declared profit for the quarter, amend it.

Our separate guide on whether to amend your MTD quarterly update after filing covers this judgement call in more detail, including what HMRC actually checks and when amendments matter.

Step 3: Is the deadline for that quarter still open?

You can amend a quarterly update after filing, but you cannot do so indefinitely. Generally, you have until the filing deadline of the following quarter to make straightforward corrections. After that, adjustments typically carry over to the final declaration.

If the deadline window is still open - amend the original quarter.

If the deadline has passed - include it in your final declaration adjustment or, for larger amounts, consider whether a formal amendment is appropriate. See our guide on amending an MTD quarterly update after the deadline for what that involves.

Workflow A: Amending a Filed Quarter

Use this workflow when the expense is significant, the quarter it belongs to has already been filed, and the amendment window is still open.

1. Locate the original expense date. Check the invoice date, the delivery note, or the date on the receipt. Not the date you received it - the date the purchase or cost actually happened.
2. Update your records. Add the expense to your records for the correct quarter. If you use a spreadsheet, add a new row with the correct date and a note such as "invoice received late - dated [original date]".
3. Log in to your MTD software. In AffordableMTD, go to the relevant quarter and update the expense figures to include the newly found item.
4. Resubmit the update. The amended figures replace the previous ones. HMRC receives the corrected version.
5. Keep the supporting document. Store the invoice or receipt alongside your other records for that quarter. You need to be able to produce it if HMRC ever asks. See our guide on what proof HMRC needs for MTD expenses for what counts as acceptable evidence.

Workflow B: Including It in the Next Quarter (or Final Declaration)

Use this workflow when the amendment window has closed, the amount is small, or you have decided the correction is better handled at year end.

1. Do not enter the expense with a date from the previous quarter. That would create a mismatch between your submission dates and your record dates that looks odd.
2. Create a note. In your records, note that this expense relates to an earlier period. Something like: "Supplier invoice for [item], original date [April date], received and recorded [current date]. Relates to Q1 but included here following late receipt."
3. Include it in the current quarter's figures. Add it to the open quarter you are currently tracking. It will reduce your profit figure for this period, which is slightly off from a strict matching perspective - but for most sole traders and landlords with small amounts, this is acceptable and common practice.
4. Flag it for your final declaration. At year end, when you complete your final declaration, you or your accountant can review whether the total figures across all quarters accurately reflect your annual income and expenses. Minor timing differences between quarters generally wash out at this stage.

Common Scenarios and What to Do

Late supplier invoice

You paid a supplier in May. They sent the invoice in August. The expense date is May - it belongs in Q1. If Q1 is still within its amendment window, amend it. If not, include it in Q2 with a note, and flag for year-end review.

Corrected or reissued receipt

A supplier sent you a corrected invoice - perhaps they got the VAT wrong, or the amount changed. The corrected figure replaces the original. If you have already filed that quarter using the wrong figure, amend it. If the difference is trivial (a few pence), leave it and note the correction in your records.

Accountant flagged a missing expense

You have handed your records over to someone for a review, and they spot an expense that was never recorded. Check the date on the underlying document. Work through the decision tree above - is the quarter still open for amendment? If so, amend it. If not, include it in the current open quarter with a note, and make sure the final declaration picks up the correct annual totals.

Receipt found in a coat pocket / old bag

This one is common. The receipt has a date on it - use that date to determine the correct quarter. If it is from six months ago and that quarter is long closed, weigh up the amount. For a £4 parking receipt, it is probably not worth anything. For a £200 tool purchase you forgot about, include it in the current quarter with a note and flag it.

Bank statement shows a payment you did not record

If you do regular bank reconciliations - and reconciling before you file is strongly recommended - you may spot an outgoing payment that never made it into your records. The payment date on your bank statement is the date to use. Treat it the same way as any other late expense, working through the decision tree based on which quarter that date falls in.

Landlord: a repair invoice arrives after quarter end

A contractor finishes work in June but sends the invoice in July. The expense belongs in Q1 (assuming the work was completed in June). For landlord-specific expense questions, our practical guide to landlord expenses in MTD covers what counts and what does not. If the work genuinely straddles two quarters, use the completion date or the date the service was delivered as your anchor point.

What About Cash Purchases With No Receipt?

This is a separate problem, but related. If you made a genuine business purchase in cash and have no receipt, you still need to be able to demonstrate the expense was real and business-related. A bank withdrawal on its own is not sufficient evidence.

Options include: a note in your records made at the time, a photograph of the item, a written record of what was purchased and why it was for business. Our guide to what counts as records for MTD explains HMRC's actual requirements in full.

For allowability, the rules are the same as any other expense - it has to be "wholly and exclusively" for business purposes if you are a sole trader, or a property-related expense if you are a landlord. See our guide to self-employed business expenses in MTD or, for landlords, which landlord expenses count under HMRC's rules.

Does It Matter If I Get the Quarter Slightly Wrong?

For most DIY filers with small amounts, a minor timing difference between quarters will not lead to a penalty on its own. Your annual tax bill is calculated at the final declaration stage, using the full-year totals across all quarters. If a £50 expense ends up in Q2 instead of Q1 because an invoice arrived late, your annual profit figure is the same either way.

Where it does matter more:

• Large amounts that would significantly change the profit figure for a particular quarter
• Situations where HMRC is already looking at your records - consistent, well-dated records give a much cleaner picture
• Expenses near the boundary of allowability - those are always worth recording carefully and in the right period

Our post on which MTD filing errors actually matter gives a broader view of what HMRC typically focuses on versus what it overlooks.

Keeping a "Late Items" Log

If late receipts are a recurring issue for you - particularly if you deal with suppliers who are slow to invoice, or if you work across several sites or properties - it is worth keeping a simple "late items" log alongside your main records.

This does not need to be complicated. A basic spreadsheet with four columns works well:

• Original expense date
• Date received or discovered
• Amount
• Action taken (amended Q1 / included in Q2 with note / flagged for final declaration)

This log becomes useful at year end when you are pulling together your final declaration, and invaluable if HMRC ever asks you to explain a discrepancy between your quarterly updates and your annual figures.

In Summary

The rule is simple: expenses belong in the quarter they were incurred, not the quarter you received the invoice or found the receipt. When you discover a late item, check whether the relevant quarter is still open for amendment - if so, amend it for anything significant. If the window has closed or the amount is small, include it in the current open quarter with a clear note in your records, and make sure your final declaration reflects accurate annual totals. Good record-keeping habits - particularly logging expenses promptly and running a bank reconciliation before each filing - will reduce how often you face this problem in the first place.