After Your First MTD Quarterly Update: What Happens Next

You've Filed. Now What?

Hitting submit on your first MTD quarterly update feels like crossing a finish line. But then a question settles in: what actually happens now? Do you wait for HMRC to respond? Does anything change? Are you supposed to be doing something else already?

If that sounds familiar, you're not alone. The filing guidance tells you how to submit. It rarely tells you what comes next. This post fills that gap - covering what to expect immediately after filing, what records to keep, how to handle any mistakes you've spotted, and how to move into your next quarter without the same stress.

What HMRC Does After You Submit

Once your quarterly update has been accepted, HMRC stores the figures you've reported. There's no immediate response, no confirmation letter in the post, and no acknowledgement that your numbers look right or wrong. HMRC will not contact you after each quarterly update to say "all good." That's not how MTD works.

A quarterly update is not a tax calculation. It's a report of your income and expenses for the period. HMRC uses these figures to build a running picture of your tax year. Any actual tax calculation - including what you owe - only happens once you complete the final declaration at the end of the tax year. That's a separate step, done after 5 April.

If your software showed a green confirmation screen or gave you a reference number, that's your evidence the update was received. Keep a screenshot or note of that reference. That's your proof of filing.

Will HMRC Ask Questions?

Not routinely - and not immediately. HMRC does not audit every quarterly update as it lands. However, HMRC can open a compliance check (sometimes called an enquiry) at any point, including after a quarterly update has been filed. This isn't something to panic about, but it is a reason to keep good records.

If HMRC does ever ask questions about the figures you reported, you'll need to show the invoices, receipts, and bank records that back them up. Our post on HMRC Compliance Check After MTD Filing: What Records to Keep goes into detail on this.

For most first-time filers, no contact from HMRC after submission means everything went through fine. Silence is normal.

What to Do in the Days After Filing

Check your confirmation

Your bridging software or MTD-compatible software should have shown you an acceptance message when your update was received. If you didn't take note of it at the time, log back in and check whether your submission status shows as accepted or submitted. Save a screenshot to a folder you'll find again.

Review what you filed

Now that the pressure is off, it's worth spending a short amount of time looking over what you actually submitted. Were your income figures complete? Did you include everything you intended to claim as an expense? Were any categories miscategorised in a way that matters?

You don't need to tear the figures apart - but a calm review is easier now than trying to reconstruct it months later. Our post on Just Filed Your Q1 MTD Update? What Mistakes Actually Matter gives a useful framework for this.

Store your records properly

HMRC requires you to keep the underlying records for your quarterly update for at least five years after the 31 January filing deadline for that tax year. For a 2026-27 return, that means keeping records until at least 31 January 2033.

Records don't have to be physical paper. Digital copies - photos of receipts, PDF invoices, bank statements saved to a folder - are acceptable. What matters is that the records are readable, organised by period, and retrievable if you need them.

See our full guide on How Long to Keep MTD Records After Filing: HMRC Retention Rules for the specific rules, and What Backup Records to Keep for Your MTD Quarterly Update for a practical breakdown of what to store.

What If You've Spotted a Mistake?

This is one of the most common sources of anxiety after a first quarterly update. You file, close the laptop, and then remember something you forgot to include - or notice a figure that doesn't look right.

The good news is that mistakes in a quarterly update are generally not catastrophic. A quarterly update is not a final return. It can be amended. And not every error needs to be corrected immediately - some can wait until the final declaration.

Which mistakes actually need fixing?

Not every error is worth amending. If you underclaimed an expense - for example, you forgot to include a small software subscription - you can either amend the update or include the correct total when you do your final declaration. The quarterly update figures are not locked in stone.

Mistakes that are worth taking seriously include: significant income that was left out entirely, expenses that were claimed in the wrong category in a way that inflates your claim, or figures that were miskeyed by a meaningful amount (not a few pounds, but hundreds or more).

Our post on MTD Filing Errors: Which Ones to Fix Now and Which to Leave walks through the decision in detail.

How to amend a submitted update

If you do need to correct something, you can amend a submitted quarterly update through your software. The process involves resubmitting corrected figures for the same period. You don't need to contact HMRC directly - the software handles the resubmission.

For a step-by-step guide to doing this, see Amend Your MTD Quarterly Update After Submission: Step-by-Step.

What About the Rest of the Tax Year?

One quarterly update down, three to go - plus a final declaration. Here's the shape of what comes next.

Your four quarterly update deadlines

MTD ITSA runs on a fixed quarterly cycle. The four quarters for the 2026-27 tax year run as follows, with updates due on these dates:

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

For the full list of dates, see our post on MTD Quarterly Deadlines 2026-27: Every Date You Need to Know.

The final declaration

After all four quarterly updates are submitted, you complete a final declaration - similar in purpose to a traditional tax return, but not identical. This is where you add anything the quarterly updates don't cover: personal allowances, adjustments, other income sources, and so on. The tax you owe is calculated at this stage, not during the quarterly updates.

It's worth starting to think about this now, not in a panic later. Our post on Preparing for Your MTD Final Declaration: What to Gather Now is a good place to start.

Starting Q2: The Right Way to Transition

The biggest mistake people make after their first quarterly update is treating each quarter as a separate project that starts from scratch. Q2 should begin the day Q1 ends - not the day before the Q2 deadline.

Set up a clean record from day one of the new quarter

Open a fresh spreadsheet, a new folder, or a new entry in your software for Q2. Label it clearly. Don't mix Q2 transactions into a Q1 folder.

If you used a CSV to import transactions for Q1, set up the same process for Q2. If you found AI categorisation helpful, keep using it. The system that worked once will work again - but only if you maintain it consistently.

Our post on After Your Q1 MTD Quarterly Update: Organise Your Records for Q2 has practical guidance on this transition.

Reconcile your bank account now

After any quarterly update, it's worth checking that your bank records match what you filed. Go through your bank statement for the period you just reported and confirm that every item of income is accounted for and every expense claim has a corresponding transaction. If anything doesn't match, make a note now rather than trying to work out what happened in three months' time.

See our guide on Q2 Bank Reconciliation for MTD: Matching Records to Reality for how to approach this.

Don't wait until the deadline to start tracking

The stress of a first quarterly update usually comes from scrambling to find records for three months of activity at the last minute. The easiest way to avoid that in Q2 is to record income and expenses as they happen - weekly is ideal, monthly at the latest.

If you had problems with categorising mixed-use expenses (things used partly for work and partly personally, like a phone or home office), now is the time to establish a consistent approach. See Mixed-Use Expenses and MTD: Claiming the Business Percentage if you need clarity on that.

A Word on Payments on Account

If you're new to self-assessment style tax, you may have heard about payments on account - advance payments toward next year's tax bill. MTD quarterly updates do not change how payments on account work. They are still calculated based on your previous year's tax liability and due in January and July.

Your Q1 quarterly update does not trigger a payment. It does not create an immediate tax bill. If you're unsure how payments on account interact with your MTD filing obligations, see our post on MTD Quarterly Updates vs Payments on Account: July Deadline Explained.

Common Things People Worry About (That Are Fine)

After a first quarterly update, a few concerns come up again and again. Here's a quick reality check:

• No confirmation email from HMRC - This is normal. HMRC does not send acknowledgement emails after quarterly updates. Your submission confirmation in the software is sufficient.
• Figures that don't look "official enough" - There's no required format for how income and expenses are calculated, as long as the totals are accurate and you have records to support them.
• Worried you claimed something wrong - A quarterly update is not a final return. You can correct it, or wait and adjust at the final declaration stage.
• Unsure whether an expense was allowable - Our guide on Allowable Expenses for MTD: What You Can Claim as a Sole Trader or Landlord covers the main categories.
• Wondering if you even needed to file - See Do I Need to File Making Tax Digital for Income Tax? if you're still unsure about your obligations.

The Bigger Picture

MTD is a shift in how income tax record-keeping works - not a new tax, not a heavier burden, and not something that should take over your life. The aim is to spread the admin across the year rather than cramming it all into January. Done consistently, the quarterly system is genuinely lighter than a last-minute annual scramble.

But it only works that way if you build the habit now, while the process is fresh. One quarterly update filed is evidence that you can do this. Three more and a final declaration, and you'll have completed your first full MTD year.

If you want to understand how MTD fits into the wider picture - what it replaces, what it doesn't, and what common assumptions are simply wrong - our post on MTD Myths Explained: 5 Things MTD Doesn't Actually Require is worth a read.

Summary

After your first MTD quarterly update, there's no immediate response from HMRC - that's normal. Your job now is to store your records safely, review the figures you filed while they're still fresh, and correct anything meaningful if needed. Then start Q2 immediately, with a clean record system in place from the first day of the new period. The final declaration at the end of the tax year is where your actual tax bill gets calculated - the quarterly updates are just building blocks toward that.