What Happens If I Missed the August MTD Quarterly Update?

An August deadline can arrive quickly when you are busy earning, managing jobs, chasing invoices or keeping a property let. If you are asking, what happens if I missed the August MTD quarterly update?, the practical answer is: act now, but first make sure you know exactly which HMRC obligation you have missed.

For many sole traders and landlords moving into Making Tax Digital for Income Tax, August is the deadline for the first quarterly update of the tax year. However, an August deadline can also relate to a quarterly VAT Return. The consequences and next steps are different, so treating every missed MTD deadline as the same can create unnecessary worry - or leave the real issue unresolved.

First, establish which MTD submission is overdue

The phrase “quarterly update” is most commonly used for Making Tax Digital for Income Tax Self Assessment. Under the standard quarterly periods, the first update covers income and expenses from 6 April to 5 July and is normally due by 7 August. Some businesses use calendar quarters instead, but the August filing date is still a familiar one.

This update gives HMRC a running picture of your business or property income and allowable expenses. It is not your final tax return, and it does not normally create an immediate Income Tax bill merely because you have submitted it.

A quarterly VAT Return is different. It is a formal VAT submission, with VAT usually due at the same time. A business may refer to it casually as an MTD update because it is filed through compatible software, but it carries a separate deadline and penalty framework.

Check your HMRC account, your accounting software and any HMRC reminders before taking action. Look at the period covered, the submission type and the due date. That five-minute check can prevent you from submitting the wrong information or overlooking a VAT payment.

If you missed an MTD Income Tax quarterly update

If the overdue item is your MTD for Income Tax quarterly update, submit it as soon as your figures are ready. Do not wait until the next quarter in the hope that the two periods will somehow cancel each other out. Each required update should be sent for its own period.

The main job is to bring your digital records up to date. That means recording all business income and expenses for the relevant quarter, then checking that the totals in your software make sense before filing. A black cab driver, for example, may need to account for card fares, cash takings, app income, fuel, vehicle costs and other trade expenses. A subcontractor will need to ensure invoices, materials, travel and CIS deductions are properly recorded. Landlords should separate rental income, agent fees, repairs and other property costs.

Do not guess figures simply to get a submission away. A rushed update based on incomplete bank transactions can cause more work later and give you an inaccurate view of your tax position. If an estimate is permitted in your circumstances, keep a clear note of it and make sure it is corrected when the actual figure is known.

For MTD Income Tax, the quarterly update is designed to keep records current through the year. Your final tax position is confirmed after year-end through the final declaration process, when adjustments such as capital allowances, reliefs and accounting entries are dealt with. That is why a missed August update is not automatically the same as missing a Self Assessment tax payment.

That said, it is still a compliance requirement. Leaving it unfiled can lead to HMRC contact, makes later updates harder to prepare and may affect your ability to see reliable tax estimates. The exact consequences can depend on your MTD obligations and circumstances, so it is sensible to correct the position rather than assume there is no issue because no payment is due that day.

What happens if I missed the August MTD quarterly update for VAT?

If the missed August deadline was for a VAT Return, the priority is more urgent. Submit the return immediately and arrange payment of any VAT due. Making Tax Digital does not change the underlying VAT responsibility - it changes the way most VAT-registered businesses keep records and submit their return.

A late VAT Return can result in a late submission penalty point. Build up enough points and HMRC may issue a financial penalty. If the VAT payment is late, HMRC may also charge late payment interest. Further late payment penalties can apply where payment remains outstanding beyond the relevant time limits.

The sensible approach is not to wait for a letter from HMRC. File the correct return, pay what you can straight away, and deal with any remaining balance promptly. If there is a genuine reason you could not submit or pay on time, keep evidence. Depending on the situation, it may support a reasonable excuse or help when discussing payment arrangements, but it does not remove the need to submit the return.

If you pay VAT by Direct Debit, remember that the collection date is normally later than the filing deadline. That does not mean you can submit the return late. The Direct Debit must also have been set up in time for HMRC to collect the payment.

The four practical steps to take now

1. Confirm the obligation and deadline. Check whether this was an Income Tax quarterly update, a VAT Return or another HMRC filing altogether. Do not confuse it with a CIS monthly return, payroll filing or Self Assessment payment on account.

2. Bring the records up to date. Reconcile your business bank account, cash records and payment platforms. Make sure expenses are supported and that personal spending has not been included as a business cost.

3. Submit through your compatible software. Check that the software shows a successful submission and retain the confirmation. If it shows an error, resolve that before assuming HMRC has received the update.

4. Deal with any tax due. This is particularly relevant for VAT. For Income Tax MTD updates, check your estimated liability as a planning tool, but remember that the final amount is determined after the tax year ends.

Avoid sending a duplicate submission because you are unsure whether the first one went through. Check the software submission log and your HMRC account first. If the period has been closed, an amendment or correction may be needed rather than a second return.

Do not confuse MTD deadlines with other August pressures

Self-employed people often have several tax dates in play at once. A missed MTD quarterly update is separate from your 31 July Self Assessment payment on account, if one was due. It is also separate from CIS obligations: contractors must usually file monthly CIS returns by the 19th of the following month, and those deadlines have their own consequences.

For limited company directors, MTD for Income Tax may not be the relevant issue at all. Your immediate responsibilities could instead be VAT, payroll, Corporation Tax, statutory accounts or a confirmation statement. This is another reason to identify the exact notice or software reminder rather than relying on the wording “quarterly update”.

Prevent the next deadline becoming another last-minute job

The best protection is a simple routine that fits the way you work. Put your bank feed into your software, photograph or upload receipts as you receive them, and spend a short amount of time each week categorising transactions. For a busy tradesperson or driver, that is far easier than sorting months of fuel receipts, invoices and card payments in the week before a deadline.

Set reminders a fortnight before each due date and again a few days before. If you use an accountant, agree who is responsible for keeping the records current and who presses submit. Good bookkeeping is not just about keeping HMRC happy. It gives you a clearer picture of cash flow, expenses and the tax you need to set aside.

If the records have built up or you are unsure whether the August item was VAT, Income Tax MTD or something else, getting it checked early is usually the quickest route back to control. Short And Sons Accountants can help self-employed workers, landlords and small businesses turn a missed filing into an organised plan, without the jargon or judgement.