Your checklist before the MTD deadline
Before 7 August 2026, confirm six things: you're in Wave 1, you have MTD-compatible software, you know your quarter basis, your records are up to date, you know you can file early, and any spreadsheet is digitally linked through bridging software.
The checklist
1. Confirm you are actually in Wave 1
Wave 1 applies if your gross qualifying income, self-employment and property combined, was over £50,000 on your 2024/25 return. Not sure? Check your position before you do anything else.
2. Get MTD-compatible software set up
There is no HMRC portal for quarterly updates. If you have not chosen software yet, do this first. Free routes exist and can be set up quickly.
3. Decide your quarter basis
Standard quarters (6th-to-5th) are the default. Calendar quarters (1st-to-last-day) must be elected in your software before this first update, and are then locked for the year.
4. Gather your records for the quarter
Income and expenses for each business, added up from the start of your accounting period to 5 July 2026. Estimates are fine if you correct them later.
5. File when ready, not necessarily at the last minute
You can submit up to 10 days before 7 August 2026 once your figures are complete.
6. If you use spreadsheets, check they are digitally linked
Spreadsheets remain compliant, but only when linked to HMRC through bridging software. A spreadsheet on its own is not enough.
The one thing worth double-checking: software before records
It's tempting to gather your figures first and worry about software later, but do it the other way round if you can. Getting compatible software in place first means you're entering records directly into something that can file, rather than reconciling a spreadsheet against new software under time pressure.
Common questions
I have not chosen software yet, what now?
Go to the Software Chooser first. Several genuinely free options exist depending on your bank or business type, and most can be set up within a day.
What actually counts as "ready" for this deadline?
Your cumulative income and expense figures for the quarter, entered into MTD-compatible software, submitted on or before the deadline. Estimates that you correct later are accepted.
Can my accountant do this for me?
Yes. An accountant or bookkeeper using MTD-compatible software can file on your behalf. You still need digital records for them to work from.
I am not sure I am even in Wave 1, what do I check?
Your combined gross income (self-employment plus property, before expenses) against the £50,000 threshold on your 2024/25 return.