Two Quarters, One Window: Why Q2 Starts Before Q1 Is Even Filed

Most people filing their first MTD quarterly update are focused on one thing: the 7 August 2026 deadline for Q1. That makes sense. But here is the part that catches people off guard - Q2 does not wait for Q1 to be done. The second quarter begins on 6 July 2026, just 11 days before your Q1 deadline. If you are only thinking about August, you are already behind on Q2 record-keeping. This post explains the Q2 timeline, what quarter type you are on, and the practical steps to sort now so Q2 does not become a scramble.

The Q2 Timeline at a Glance

Before diving into what to do, it helps to have the dates clear in your head.

Notice that Q2 starts on 6 July, which is during the window when you are still finalising Q1 records. For the full picture of all quarterly deadlines across the 2026-27 tax year, see our guide to MTD quarterly deadlines for 2026-27.

Note: The 5 November 2026 deadline for Q2 is not just a distant date to worry about later. How well you set up your records in July and August directly affects how much work you face in October.

Standard vs Calendar Quarters: Which One Are You On?

This is one of the most misunderstood parts of MTD. When you signed up, HMRC assigned you a quarter type. There are two options.

Standard quarters (HMRC default)

These follow the tax year calendar:

Most people are on standard quarters unless they elected otherwise during sign-up.

Calendar quarters (elected)

These align with the calendar month:

Calendar quarters are popular with landlords and sole traders who already run their accounts to month-end. The filing deadlines are the same regardless of which quarter type you are on.

How to check which type you are on

Log into your HMRC online account or check your bridging software. If you are not sure, your MTD software will usually show your quarter dates when you go to create a new update. If you are still unsure, check HMRC's Making Tax Digital for Income Tax guidance.

Can you change your quarter type?

Yes, but only once per tax year and only before the first quarterly update for that year has been submitted. Once you have filed Q1, you are locked in for the rest of 2026-27. If you want to switch to calendar quarters, you would need to do so before submitting your Q1 update - and at this point that window is very tight.

Warning: If you are on calendar quarters, your Q2 begins on 1 July, not 6 July. That is five days earlier than the standard quarter start. Make sure you know your quarter type before you assume you have until 6 July to start capturing Q2 records.

What Counts as Q2 Income and Expenses

Q2 covers the period from 6 July (or 1 July on calendar quarters) to 5 October (or 30 September). For both sole traders and landlords, the same categories apply as Q1. You are reporting:

This is cash-basis reporting unless you have specifically opted out. That means the date that matters is when money left or entered your account, not when the invoice was raised.

For a full breakdown of what income types are accepted, see what income types MTD quarterly updates accept. For allowable expenses, our guide to allowable expenses for MTD covers both sole trader and landlord categories.

Why Q2 Setup Matters More Than Q1

Q1 was the trial run. Most people found at least one thing that did not work well - a spreadsheet that was not structured correctly, a bank account that was not being tracked, or expense receipts that had piled up unrecorded. Q2 is the chance to fix those problems before they repeat.

If your Q1 records were messy, read fixing messy expense records before August before Q2 starts. If you made errors in your Q1 update, see common Q1 MTD submission errors and how to fix them.

Q2 also tends to include seasonal income and expenses that Q1 did not. Landlords may have summer maintenance costs. Sole traders may have different project patterns. Think about what is likely to be different in July through September and plan your categories accordingly.

Practical Q2 Setup Tasks to Do Now

You do not need to wait until Q2 starts to prepare. Here are the actions worth taking in the next two weeks.

1. Confirm your Q2 start date

Check whether you are on standard or calendar quarters and note the exact date Q2 begins for you. Write it down somewhere you will actually see it.

2. Review how you captured Q1 records

What worked? What did not? If you were manually logging income from a spreadsheet, could you import a CSV instead? AffordableMTD supports CSV imports with AI-assisted categorisation - see how that works in our guide to importing Q1 expenses via CSV.

3. Set up a clean record for Q2

Do not carry over half-finished Q1 notes into your Q2 file. Start fresh. Whether you use a spreadsheet, a bank export, or your bridging software directly, open a new section or file that is clearly labelled Q2 2026-27.

4. Check your bank feeds or export schedule

If you are manually exporting transactions, set a reminder to do this at least monthly during Q2. Leaving it until October means three months of backfilling, which is where mistakes happen.

5. For landlords - log any new tenancy or rent changes

If a tenancy started, ended, or the rent changed during the quarter, note the exact dates. This affects how you allocate income across quarters. For more on what landlords specifically need to include, see what landlords must include in their first MTD Q1 filing.

6. For sole traders - note any new income sources

If you took on a new client, started a new type of work, or received any one-off payments, make sure your category structure covers them. The common mistake is adding a new income stream mid-quarter and then forgetting to track it consistently. See our post on sole trader Q1 MTD income mistakes for the patterns to avoid.

7. If you have mixed income - check your business split

If you are both a sole trader and a landlord, you have separate income sources to report. Make sure your Q2 setup keeps these clearly separated. Our guide to mixed income and MTD for landlords with self-employment covers this in detail.

The Overlap Window: Filing Q1 While Running Q2

Between 6 July and 7 August, you are effectively in two quarters at once. Q1 is still open for filing, and Q2 has already started accumulating transactions. This is normal - it is how the MTD calendar works. But it does mean you need to be clear about which period each record belongs to.

A payment received on 8 July belongs to Q2, not Q1. An expense paid on 3 July belongs to Q1. Simple in principle, but easy to mix up if your records are not organised by date.

If you need to amend your Q1 update after you have submitted it, that is possible. See how to amend your Q1 MTD update before the 7 August deadline and how to correct a submitted Q1 update for the steps involved.

What Happens After Q1 Is Filed

Once you have submitted your Q1 update by 7 August, there is no immediate tax to pay. Quarterly updates are cumulative income and expense figures - they do not trigger a payment on their own. The actual tax calculation happens in your final declaration (previously called the tax return) after the tax year ends.

For clarity on how quarterly updates relate to the final declaration, see MTD quarterly updates vs full tax return and quarterly updates vs final declaration.

After filing Q1, the next practical step is to check your Q2 records are underway and tidy. See what to do after your Q1 filing is submitted for a full post-filing checklist.

Common Q2 Mistakes to Avoid

Based on the patterns that trip people up in Q1, here are the Q2 mistakes worth actively avoiding:

Do You Need to Do Anything on HMRC's Side?

No. There is no action needed with HMRC to start Q2. You simply continue keeping records from 6 July (or 1 July on calendar quarters) in the same way you did for Q1. The next time you need to interact with HMRC is when you submit your Q2 update, which is due by 5 November 2026.

If you missed the Q1 deadline or are still working out whether you are exempt, see what happens if you missed the 7 August deadline and MTD exemptions and reasonable excuse.

Note: Q2 records do not need to be perfect in real time. You have until 5 November to file. But the less you let records accumulate unchecked, the shorter and less stressful your October filing prep will be.

Summary

Q2 begins on 6 July for those on standard quarters, or 1 July for calendar quarter users. That is before Q1 is even due. The overlap is manageable, but only if you know your quarter type, keep your records clearly separated by date, and start Q2 tracking from day one rather than catching up in October. Spend an hour now confirming your setup - it will save you several hours later.

Start Q2 on the right foot with AffordableMTD

AffordableMTD is HMRC-recognised bridging software built for sole traders and landlords. Import your transactions, categorise your income and expenses, and submit your quarterly updates directly to HMRC - without expensive accounting software.

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