MTD vs Self Assessment for Sole Traders (2026–2028): What Changes and What Stays the Same

If you’re a sole trader (or you run a small property business), you’ve probably got used to the rhythm of Self Assessment: keep your records, file one tax return after the year ends, and pay by 31 January (with payments on account if they apply). Making Tax Digital for Income Tax (often shortened to MTD for Income Tax or MTD ITSA) changes the process, but it doesn’t change the underlying tax rules.

This guide compares MTD vs Self Assessment in plain English: what’s genuinely different, what stays the same, and what you’ll need to do in practice as the rollout begins from April 2026.

Quick answer: what’s the difference between MTD and Self Assessment?

Who MTD for Income Tax applies to (and when)

MTD for Income Tax is being introduced in stages. It applies to people who submit Self Assessment because they have self-employment income and/or property income.

Qualifying income is generally your gross income from self-employment and/or property (before expenses). If you have both, HMRC looks at the combined figure. The exact detail matters, especially if your income sits near a threshold, so it’s worth checking early rather than waiting for a letter.

What stays the same under MTD (this often reassures people)

Although the process changes, several important things stay the same. Knowing this helps you plan calmly, rather than feeling like everything is being turned upside down.

1) The tax rules for allowable expenses don’t change

You’ll still claim the same types of allowable business costs, following the same principles (wholly and exclusively for business). MTD is mainly about how you keep records and report, not what you can claim.

Examples of common allowable costs for a typical sole trader include:

• Materials and stock
• Tools and small equipment
• Mobile phone and internet (business proportion)
• Business mileage or vehicle running costs (depending on method)
• Insurance, professional fees, and subscriptions
• Use of home as office (if applicable)

2) The tax year is still the tax year

MTD doesn’t change the UK tax year. It’s still 6 April to 5 April. What changes is that you’ll send information during the year, rather than waiting until after it ends.

3) You’ll still need a year-end “final” submission

Under Self Assessment, everything is pulled together in one annual return. Under MTD, the year-end step still exists. You’ll send a finalised set of figures for each business (your self-employment and/or property) and then confirm your overall position.

4) You can still use an accountant

MTD doesn’t remove accountants from the process. In practice, many people find they need more support at first: choosing software, setting up categories properly, and making sure quarterly updates reflect reality (without causing unnecessary stress).

What changes under MTD (the practical differences)

1) Digital record keeping becomes the default

With Self Assessment, you can keep records in almost any way, as long as you can back up the numbers. With MTD for Income Tax, you’ll need to keep digital records and submit information to HMRC using MTD-compatible software.

In plain terms, that means:

• Recording your income and expenses in software (or in a spreadsheet that links to bridging software)
• Keeping enough detail to support the totals you report
• Using “digital links” where required (so you’re not manually copying and pasting totals between systems)

2) Quarterly updates: more frequent reporting

The biggest change is the move from one annual submission to quarterly updates. These updates are summaries of your income and expenses for each quarter.

It’s important to understand what quarterly updates are and aren’t:

• They are regular snapshots of your figures for the year so far.
• They aren’t a final tax calculation.
• They don’t replace the year-end finalisation and final declaration.

Many sole traders worry that quarterly updates mean quarterly tax bills. For now, MTD ITSA is primarily about quarterly reporting, not forcing quarterly payment. Payment rules may evolve over time, but the rollout we’re discussing (2026–2028) focuses on reporting and digital records.

3) A new “year-end” process replaces the single Self Assessment return

Under MTD ITSA, you’ll typically complete:

1. Quarterly updates (four per tax year, per income source)
2. End of Period Statement (EOPS) for each business (this is where you finalise your business income and expenses for the year)
3. Final Declaration (this is the overall confirmation, similar in spirit to the current Self Assessment declaration)

In practice, the year-end step is where we usually tidy up the accounting, make sure claims are correct, include any accounting adjustments, and ensure everything is consistent before you “lock in” the year.

MTD vs Self Assessment: a simple timeline example

Here’s what the difference looks like in a real-world year.

Will MTD mean you pay tax quarterly?

This is one of the most common worries, so it’s worth being clear.

MTD for Income Tax introduces quarterly reporting, not automatic quarterly payment. Most sole traders will still pay tax broadly in line with the existing Self Assessment payment timetable (including payments on account where relevant).

That said, HMRC’s longer-term direction is towards more real-time information. It’s sensible to use MTD as a prompt to set money aside regularly, because your tax bill won’t feel like a surprise at the end of the year.

Do you still do a “tax return” under MTD?

In everyday language, people will probably keep calling it a “tax return”. The difference is that, technically, MTD splits the current annual return into separate parts:

• Quarterly updates (in-year reporting)
• EOPS (finalising each business)
• Final Declaration (confirming the full tax position)

If you have other income (for example, employment income, dividends, or savings interest), that still needs to be included in the overall picture. The Final Declaration is where everything comes together.

What counts as “digital records” in practice?

Digital records under MTD generally mean you record each transaction (or a summary, depending on the rules and how your software works) in a digital format that can feed into the MTD submissions.

For many sole traders, a sensible, low-stress setup is:

• Use accounting software that connects to your bank feed (so income and spending comes in automatically)
• Upload photos or PDFs of receipts (so you’re not hunting for paperwork later)
• Use clear categories for expenses (so quarterly updates don’t become a scramble)

If you’re currently using spreadsheets and you’re comfortable with them, it may still be possible to continue, but you’ll usually need bridging software and you’ll need to ensure the spreadsheet is kept in a way that meets the digital link requirements.

Quarterly updates: what you will (and won’t) include

Quarterly updates are designed to be a practical summary, not a perfect final set of accounts. That’s why the year-end finalisation exists.

Common questions we hear:

How MTD affects sole traders with property income

If you’re a sole trader and a landlord (or you have property income alongside your trade), MTD can feel like a bigger shift because you may have more than one income source to report.

In practical terms, you might be looking at:

• Quarterly updates for your self-employment
• Quarterly updates for your property business
• Separate year-end finalisation (EOPS) for each
• One Final Declaration pulling everything together

That sounds like a lot, but with a tidy setup (bank feeds, clear categories, and a monthly check-in), it becomes routine rather than overwhelming.

What stays familiar: deadlines and the “shape” of the year

Even though there are new quarterly deadlines, the year still has a familiar shape:

• You still need to keep on top of records throughout the year
• You still need a proper year-end tidy-up
• You still need to confirm your final position and pay tax by the usual due dates

The difference is that MTD encourages you to do smaller bits of work more often, rather than a big push once a year.

Choosing software: what matters most for MTD

MTD-compatible software doesn’t need to be complicated. The best choice is usually the one you will actually use consistently.

When we help clients choose a setup, we look for:

• Ease of use on your phone as well as desktop
• Bank feeds (to reduce manual entry)
• Simple receipt capture
• Clear reporting so you can see how you’re doing and what tax to set aside
• MTD ITSA compatibility for quarterly updates and year-end submissions

If you’ve been using spreadsheets for years, it’s not “wrong”. But you do need to be honest about the admin burden. Under MTD, the cost of staying purely spreadsheet-based can be time, stress, and the risk of last-minute errors.

Common myths (and what’s actually true)

Practical preparation checklist (especially if you’re near a threshold)

If your income is close to £50k, £30k, or £20k, it’s worth preparing early. Even if you end up below the threshold, the improvements to your record keeping will still help.

1. Confirm your qualifying income (self-employment + property gross income).
2. Get your records in order: separate business bank account if possible; consistent receipt capture.
3. Choose your digital method: software or spreadsheet + bridging.
4. Set up sensible categories so quarterly updates are straightforward.
5. Build a simple routine: a monthly 30–45 minute check is often enough to stay on track.
6. Plan for year-end: keep notes of anything unusual (asset purchases, one-off costs, private use adjustments).

How we see MTD working well for sole traders

When MTD is done properly, it’s not about making your life harder. It’s about making your numbers more reliable and your tax position less of a mystery.

A good MTD setup usually means:

• You know roughly what you’re earning throughout the year
• You can see what you’re spending and whether costs are creeping up
• You set aside tax steadily, rather than panicking in January
• Year-end becomes a tidy review, not a rescue mission

Key takeaways: MTD vs Self Assessment

• MTD doesn’t change the tax rules for sole traders; it changes how you keep records and report.
• Quarterly updates are new, but they’re not the final tax calculation.
• You’ll still have a year-end finalisation and a Final Declaration.
• The rollout starts April 2026 for income over £50,000, then £30,000 in April 2027, then £20,000 in April 2028.
• The calmest approach is to prepare early: pick a system you can stick to, and build a simple routine.

Note: This article is a general guide for UK sole traders and landlords. MTD rules and HMRC guidance can change, and your circumstances matter. If you’re unsure whether you’ll be in scope from 2026, it’s worth checking your figures early so you can plan with confidence.