MTD Compliance Hurdles Every Sole Trader Should Know

Making Tax Digital is designed to be simpler, but the rules around how you keep records and submit them are stricter than the old paper-and-spreadsheet world. Most sole traders who fall foul of MTD do so in the same handful of ways — and the penalties can add up quickly.

Here are the compliance hurdles we see most often, and how to clear them without stress.

1. Not using compatible software

Under MTD, you can't just keep records in a spreadsheet and email them to HMRC. Your records must be kept in MTD-compatible software that can send submissions directly to HMRC's API.

This is the single biggest hurdle for sole traders moving across. The fix is simple: use HMRC-recognised software like AppyTax that's designed to meet the digital record-keeping and submission requirements end to end.

2. Incomplete digital records

HMRC expects every business transaction to be recorded digitally with enough detail to support your quarterly updates. Common gaps include:

• Missing receipts or expense records kept only on paper.
• Income recorded in one place and expenses in another, with no link between them.
• Rounded estimates instead of actual figures.
• Records updated only at year-end rather than as transactions happen.

The fix: log transactions as they occur, and photograph or attach receipts so everything lives in one digital record.

3. Missing a quarterly deadline

Each quarterly update has a deadline, and missing one triggers a penalty point under HMRC's points-based regime. Accumulate enough points and you face financial penalties on top.

The points system works like this: each missed submission adds a point. Reach a threshold and you pay a penalty; points expire after two years of good behaviour. The best defence is automated reminders — AppyTax nudges you well before each deadline so nothing slips.

4. Getting the quarterly periods wrong

Your quarterly updates must align with your accounting period, not the calendar year. If your accounting year doesn't start on 6 April, your quarters won't line up with standard calendar quarters — and submitting against the wrong period causes rejections and corrections.

When you set up MTD software, confirm your accounting period dates are correct from day one. AppyTax automatically maps your quarters to your accounting period so you never submit against the wrong window.

5. Overlooking the final declaration

The quarterly updates aren't the end of your obligations. After your fourth quarterly update, you still need to submit a final declaration to confirm your full-year figures, claim any reliefs and allowances, and finalise your tax position.

Sole traders often think the last quarterly update closes the year — it doesn't. Treat the final declaration as a separate, required step with its own deadline (normally 31 January after the tax year ends).

6. Not keeping records for long enough

HMRC requires you to keep your records for at least five years after the 31 January submission deadline of the relevant tax year. Deleting records too early is a compliance failure, even if your submissions were correct at the time.

Cloud-based software like AppyTax stores your records securely for the full retention period, so you don't have to manage this manually.

Stay on the right side of HMRC

Compliance under MTD is mostly about good habits: log transactions as they happen, use proper software, and never let a deadline sneak up. AppyTax handles all three for you — subscribe and take the compliance worry off your plate.