Making Tax Digital for Income Tax Self Assessment (MTD ITSA) is live for sole traders and landlords with combined income over £50,000 from April 2026, with the £30,000 threshold following in April 2027. The penalties for missing quarterly updates are real, and the setup work needs to happen before the period starts, not after. This guide walks through a practical MTD ITSA bookkeeping setup that will keep you compliant without overcomplicating your life.
What MTD ITSA actually requires
From the applicable start date, affected taxpayers must:
- Keep digital records of all business income and expenses.
- Submit quarterly updates to HMRC within one month of each quarter end.
- Submit a final declaration (replacing the old Self Assessment return) by 31 January following the tax year.
- Use MTD-compatible software for all of the above.
The four building blocks of compliance
1. MTD-compatible software
The list of approved software includes Xero, QuickBooks, FreeAgent, Sage, and a growing list of others. Spreadsheets are allowed but only with "bridging software" that pushes the data to HMRC. We strongly recommend full cloud software for anyone with more than 50 transactions per quarter — the time saved on bookkeeping pays for the subscription many times over. As a Xero Platinum and QuickBooks Elite partner, we have preferential pricing on both — see our cloud bookkeeping page for details.
2. Separate income streams
If you have, say, a sole trade and rental income, they need to be reported separately under MTD. Set up your bookkeeping with clearly separated tracking categories, classes, or even separate Xero/QuickBooks files. The quarterly update splits them out, so the data has to be clean at source.
3. Digital links throughout
HMRC requires "digital links" between every step from the original transaction to the submission. That means no manually re-typing numbers into a different system. Bank feeds plus receipt-capture apps satisfy this naturally. If you use spreadsheets, the link from spreadsheet to bridging software must be a formula or import, not a manual copy-paste.
4. Receipt evidence
Digital records include the underlying receipts and invoices. Capturing receipts via Dext, Hubdoc, or QuickBooks built-in capture both satisfies MTD evidence requirements and feeds your bookkeeping. See our piece on receipt management for tool selection.
Practical setup timeline
Three months before your MTD start date
- Choose your MTD-compatible software.
- Migrate any historical data needed for opening balances.
- Set up bank feeds for every business account.
- Configure receipt capture.
Two months before
- Build your chart of accounts to mirror the MTD reporting categories.
- Set up bank rules for recurring transactions.
- Test a "dry run" by closing a recent month as if it were under MTD.
One month before
- Register for MTD ITSA with HMRC (your accountant can do this).
- Confirm software is linked to HMRC's MTD service.
- Brief any bookkeeper or VA on the new quarterly rhythm.
The quarterly rhythm
Each quarter under MTD requires the cumulative figures for the tax year to date — not just the quarter — broken down by income category and expense category. The deadline is one month after the quarter end, so:
- Q1 (Apr–Jun): submit by 5 August.
- Q2 (Jul–Sep): submit by 5 November.
- Q3 (Oct–Dec): submit by 5 February.
- Q4 (Jan–Mar): submit by 5 May.
Then a final declaration by 31 January of the following year wraps up the tax year.
Penalties: the points system
HMRC uses a points-based penalty system. Each missed quarterly submission earns one point. Four points (for quarterly filers) triggers a £200 penalty, and every subsequent miss earns another £200. Points reset after a clean compliance period. There are separate late-payment penalties. The key takeaway: occasional misses are forgiven; chronic non-filing gets expensive.
Cash basis vs accruals under MTD
Cash basis remains the default for sole traders under MTD. It also fits quarterly reporting beautifully — the data is whatever has gone through the bank. Accruals adds more discipline because the quarterly figures need to reflect what's been earned, not received. See our cash basis vs accruals deep-dive for the decision framework.
Common setup mistakes
- One bookkeeping file for sole trade and rentals. They need to be separated.
- No bank feed. Manual entry doesn't satisfy MTD digital links.
- Personal spending mixed with business. Open a dedicated business account before MTD starts.
- Spreadsheet with manual exports. Either go full software or use proper bridging.
- No receipt capture. The evidence requirement still applies.
Landlords specifically
Property income above £50,000 (combined with any sole trade income) falls under MTD ITSA. Setup needs:
- Separate tracking per property (or at least per portfolio if you have many).
- Mortgage interest categorised correctly given the restriction rules.
- Capital expenditure separated from repairs.
- Rental income recognised correctly (cash basis is allowed for property up to £150k).
What we do for clients
Our MTD ITSA setup is a fixed-fee implementation covering software selection, migration, chart of accounts design, bank feed setup, receipt capture, and a dry-run of the first quarterly submission. We then run the ongoing quarterly submissions as part of our cloud bookkeeping service. Most clients are fully ready a quarter before their go-live date, which is when you want to be.
Should you delay?
If your income is around the £50,000 threshold, you might be tempted to manage things to stay under. Don't. The threshold is moving down to £30,000 and ultimately to £20,000. The work needed to comply now is the same as the work in two years, so you're better off building the infrastructure once.
MTD ITSA is the biggest change in self-assessment in a generation, but the setup is genuinely manageable if you start early. Speak to our team via our contact page or book a 30-minute MTD readiness call if you'd like us to walk through your specific position.