It's October: Your Q2 MTD Mid-Quarter Check (Before November Chaos)

You're Halfway Through Q2. That's Exactly When Things Go Wrong.

October is the quiet bit. The Q2 deadline isn't until 7 November, so it doesn't feel urgent yet. That's precisely why Q1 turned into a last-minute scramble for so many people - not because the task was hard, but because mid-quarter felt fine right up until it didn't. This post is for the week or two you're in right now: roughly halfway through Q2, with just under 40 days left. That's enough time to fix most things. It's not enough time to ignore them.

This isn't about setting up Q2 (you've done that) or what to do after filing (that comes later). This is specifically about the checks and small fixes that matter right now in October, before November gets busy and the deadline is suddenly two days away.

Step One: Work Out Where Your Records Actually Stand

Before you do anything else, be honest about what you've actually got recorded for Q2 so far. Not what you meant to record - what's actually in your spreadsheet, software, or folder right now.

Ask yourself:

• Do I have a record for every payment received since 6 July?
• Do I have receipts (or digital copies) for every expense I'm planning to claim?
• Is there a gap of more than two or three weeks where nothing is recorded?
• Have I mixed personal and business spending in the same record anywhere?

If any of those answers make you feel uncomfortable, you're not alone. But the good news is that October - not the first week of November - is the right time to find out. You still have time to hunt down a missing invoice, request a duplicate receipt, or separate a mixed transaction. That becomes much harder at 11pm on 6 November.

If your records are genuinely all over the place, start with the post on fixing messy Q2 records before the November deadline.

Income Reconciliation: Do This Before the End of October

Income reconciliation just means checking that the money you've recorded matches the money that actually came in. It sounds obvious. Most people skip it until the day before they file, then panic when the numbers don't match.

For sole traders

Pull up your bank statement for the period 6 July to today. Go line by line. Every payment that came in should have a corresponding entry in your records. If you issued invoices, check which ones have been paid and which haven't. Unpaid invoices at the end of Q2 may or may not count as income depending on your accounting basis.

If you're on the cash basis (which is the default for most sole traders under MTD), you report income when you actually receive it - not when you invoice. So an invoice you sent in August that still hasn't been paid by 5 October does not go into Q2. It goes into whichever quarter the money actually arrives. If you're not sure which basis applies to you, see how to calculate your quarterly update income.

If you use a dedicated business bank account, this is straightforward. If you mix business and personal in one account, you'll need to go through every line and flag the business income manually. That takes longer than you think - do it now, not on 5 November.

For landlords

Check every property. For each one, confirm:

• Which months' rent was due in Q2 (July, August, September for most people)
• Which of those amounts were actually received
• Whether any arrears from Q1 came in during Q2 (that counts as Q2 income under the cash basis)
• Whether any deposits were received - note that deposits held in trust are generally not rental income until you make a deduction

For more detail on how deposits and allowances work in Q2, see Q2 rental income reconciliation.

Expense Review: The Mistakes That Are Hiding in Plain Sight

This is where most errors live. Not fraud, not big omissions - just ordinary miscategorisation that you don't notice until HMRC asks about it or until your numbers don't add up.

Check your categories

In an MTD quarterly update, you report expenses under specific headings - things like office costs, travel, financial charges, professional fees. If you've been dumping everything into one catch-all category, stop now and sort it properly while the transactions are still relatively fresh in your mind. See the field-by-field guide to the quarterly update form if you're unsure what goes where.

Common miscategorisation mistakes at mid-quarter include:

• Putting phone bills in "office costs" when part of the usage is personal (it should be a reduced, business-use-only figure)
• Claiming a full equipment purchase as an expense when it should be treated as a capital allowance
• Recording a one-off repair under "professional fees" instead of "repairs and maintenance"
• Mixing allowable and non-allowable costs in the same category

The post on common MTD expense miscategorisation mistakes covers this in detail. It's worth a read before you finalise anything.

Mixed personal and business spending

If you've bought something that's partly for business and partly personal - a phone, a laptop, a car journey - you can only claim the business proportion. This is one of the most common areas where DIY filers go wrong. You're not trying to be dishonest; it's just easy to forget to split the figure. The guide on claiming the business percentage of mixed-use expenses explains how to work this out.

Check you actually have evidence

For every expense you're planning to include, do you have something that supports it? A receipt, a bank statement line, an invoice? HMRC doesn't require you to attach evidence when you file - but they can ask for it later. If a receipt has gone missing, now is a much better time to request a duplicate from the supplier than in three years during a compliance check.

See what proof HMRC needs for MTD expenses if you want a clear picture of what counts.

Spot the Common Q2 Mistakes While You Still Can

Mid-quarter is a good moment to check for patterns that became problems in Q1 - and to catch them before they repeat.

Missing months

Look at your records month by month. Is July there? August? September? Sometimes one month gets lost entirely, especially if you were away, had a quiet period, or switched from one tracking method to another. A missing month shows up as an oddly low income or expense figure when you reconcile against your bank statement.

Duplicates

If you've imported transactions from a bank statement or CSV file at any point, check for duplicates. It's easy to import the same month twice, especially if you weren't sure whether a previous import had worked. Duplicate entries inflate your expenses and can be hard to spot unless you're looking for them. The guide on Q2 bank reconciliation covers how to check this.

Late Q1 transactions that crept into Q2

If a payment you made or received in Q1 (before 5 July) didn't clear until early July, it might have accidentally landed in your Q2 records. This happens most often with payments made right at the end of a quarter. Check the first two weeks of July carefully and make sure everything you've recorded there actually belongs to Q2. For help on which quarter a borderline transaction belongs in, see late receipts and missing invoices - which quarter does it go in.

Expenses you forgot to record because they're on a different card

If you use more than one bank account or card for business spending, it's easy to record everything from one account and forget the other entirely. Do a quick check: do you have a second card you've used for business costs? A PayPal account? A business credit card? These need to be included too.

A Simple Weekly Action List for the Rest of October

You don't need to spend hours on this every day. A few focused minutes each week is enough to arrive at 7 November without a crisis. Here's what to actually do:

This week

1. Pull your bank statement from 6 July to today and compare it to your records. Note any gaps.
2. Check your expense categories - are you using the right ones for each type of cost?
3. Chase any missing receipts from July or August now, before suppliers archive old records.

Next week

1. Reconcile your income - every payment received should have a matching entry.
2. If you're a landlord, check rent received per property against what was due.
3. Flag anything you're unsure about and make a note to look it up - don't just skip it.

Final week of October

1. Check for duplicate entries if you've imported any CSV files.
2. Confirm your totals look reasonable - if income or expenses are much higher or lower than Q1, understand why.
3. Make sure you know how you're going to file (via Affordable MTD's bridging software if you use a spreadsheet, or directly if your software connects to HMRC).

If you're preparing a spreadsheet for import, check how to prepare your expense spreadsheet for MTD import so it's in the right format before you try to submit.

Before You Get to Filing Week

The post on whether your quarterly update is actually ready to file is worth bookmarking for the last few days of October or the first few days of November. It walks through the final checks before you hit submit.

You don't need to do all of that now. But knowing what it covers helps you understand what you're working toward - so that filing week is a ten-minute job rather than a three-hour panic.

What You're Actually Trying to Achieve by End of October

There's no formal mid-quarter checkpoint required by HMRC. Nobody is checking on you in October. But there's a simple practical goal worth having: by 31 October, your Q2 records should be complete enough that you could file at 48 hours' notice if you had to.

That doesn't mean everything is perfect. It means:

• You know what your income total looks like
• Your expenses are categorised, at least roughly
• You have receipts or other evidence for the material amounts
• There are no obvious gaps you haven't yet accounted for

If you can say yes to all four of those by end of October, the 7 November deadline becomes a non-event. That's the whole point.

Pulling It Together

October isn't the panic month - November is, if you've done nothing. The work you do now is genuinely light: a bank reconciliation, a category check, a quick look for duplicates or missing months. None of it takes long. But it's the difference between a straightforward Q2 filing and a repeat of whatever Q1 felt like. If Q1 was fine, keep doing what you did. If Q1 was stressful, this is the window to do something about it. Use it.