Making Tax Digital for Income Tax 2026: Complete Guide for UK Sole Traders

Written by Calvin Lo, Founder of Aphelios Software | July 2026 | 8 min read

Making Tax Digital for Income Tax (MTD ITSA) is one of the biggest changes to hit UK self-employed workers in a generation. Unlike the earlier rollout of MTD for VAT, which only affected VAT-registered businesses, this new phase requires sole traders and landlords across England, Scotland, and Wales to keep digital records and submit quarterly updates to HMRC using compatible software. If you are a sole trader earning over £50,000, the deadline is already here - April 2026 is the start point, and preparation is no longer optional.

This guide explains exactly what MTD for Income Tax means, who it affects, what you need to do, the software options available, and how Aphelios Software can help you stay compliant while managing your day-to-day business more efficiently.

What Is Making Tax Digital for Income Tax?

Making Tax Digital for Income Tax is HMRC's programme to bring self-assessment tax returns into the digital age. Rather than completing one annual tax return, affected sole traders and landlords will need to:

• Maintain digital records of income and expenses throughout the year.
• Submit quarterly digital updates to HMRC summarising your income and expenses.
• File an end-of-year declaration confirming the information is complete and accurate.

The goal is to give both HMRC and taxpayers a more real-time picture of tax liabilities, reduce errors, and eliminate the rush of last-minute self-assessment filings every January. HMRC's step-by-step guidance at GOV.UK – Making Tax Digital for Income Tax for businesses step by step sets out the full process.

Who Does MTD for Income Tax Affect?

The rollout is staggered by income level:

• April 2026: Self-employed individuals and landlords with qualifying income above £50,000.
• April 2027: Those with qualifying income above £30,000.
• April 2028: Those with qualifying income above £20,000.

Qualifying income is your gross self-employment income and/or property income before any deductions or allowances. If you operate multiple self-employment businesses or have both self-employment and property income, the combined total is what determines your eligibility.

Partnerships are also included. General partnerships with five or fewer partners must comply from April 2026 if their qualifying income exceeds the threshold. Larger partnerships have separate rules and timelines.

If you are already VAT-registered and submit MTD for VAT returns, you are already familiar with the concept of digital record-keeping. However, MTD for Income Tax is a separate obligation, and being compliant for VAT does not automatically cover you for Income Tax.

The Quarterly Update Process

Quarterly updates replace the single annual self-assessment return for reporting purposes. Here is how the tax year is broken down:

• Quarter 1: 6 April – 5 July, due by 7 August.
• Quarter 2: 6 July – 5 October, due by 7 November.
• Quarter 3: 6 October – 5 January, due by 7 February.
• Quarter 4: 6 January – 5 April, due by 7 May.

Each quarterly update is not a full tax calculation. It is a summary of your business income and expenses for the period, submitted digitally through your MTD-compatible software. At the end of the tax year, you must submit an end-of-year declaration, which is the point where final tax adjustments, personal allowances, and reliefs are applied. This replaces the traditional self-assessment tax return.

For sole traders with straightforward affairs, this is a relatively simple process. Your software pulls data from your digital records and generates the submission. If you use a tool like Aphelios for inventory management or a POS system that tracks sales in real time, much of the data you need is already captured automatically.

What Software Do You Need?

HMRC requires you to use software that is recognised as MTD-compatible. Your software must be able to:

• Maintain digital records of your income and expenses.
• Connect to HMRC's API to submit quarterly updates.
• Generate your end-of-year declaration.

There are several options available:

• Commercial accounting software: Products like FreeAgent, Xero, QuickBooks, and Sage all offer MTD ITSA-compatible versions. These range from around £10 to £35 per month depending on the plan.
• HMRC's free tool: HMRC provides a basic, free tool for those with simple tax affairs. However, it has limited functionality and is not suitable for businesses with complex income streams.
• All-in-one business platforms: Platforms like Aphelios Software that combine inventory, POS, invoicing, and accounting can serve double duty - managing your operations and your tax compliance in one place.
• Bridging software: If you prefer to keep records in a spreadsheet, bridging software can connect your data to HMRC. However, this adds an extra step and increases the risk of errors.

For sole traders who also sell products - whether online, at markets, or in a shop - using a POS system with built-in MTD compatibility is the most efficient approach. Every sale is recorded digitally, expenses are tracked in real time, and quarterly updates can be submitted at the click of a button.

Key Deadlines to Remember

Missing a quarterly update deadline triggers HMRC's penalty points system. Here are the critical dates for the 2026 to 2027 tax year:

• 7 August 2026: Q1 update (April to June) due.
• 7 November 2026: Q2 update (July to September) due.
• 7 February 2027: Q3 update (October to December) due.
• 7 May 2027: Q4 update (January to March) due.
• 31 January 2028: End-of-year declaration and balancing payment for the 2026 to 2027 tax year.

Note that while the quarterly updates replace the annual return for reporting, you still need to make your final payment on 31 January. The key difference is that instead of receiving one large unexpected bill, your quarterly updates give you (and HMRC) a rolling estimate of your tax liability throughout the year, making it far easier to budget.

Penalties for Non-Compliance

HMRC has introduced a new penalties framework specifically for MTD. The system works as follows:

• Late submission penalty points: Each quarterly update submitted after the deadline earns one penalty point. Once you reach 4 penalty points within a rolling 12-month period, you receive an automatic £200 fixed penalty.
• Late payment interest: If you have an outstanding tax balance, HMRC will charge interest from the day after the payment deadline. From April 2026, this is set at the Bank of England base rate plus 2.5%.
• Escalating late payment penalties: If your tax remains unpaid after 15 days, HMRC charges a 2% penalty on the outstanding amount. After 30 days, a further 2% penalty applies. If the balance remains unpaid after 6 months and 12 months, additional penalties of 4% each are charged.

The good news is that HMRC has indicated it will apply a "soft landing" approach during the first year, meaning penalties for late submission may not be enforced immediately if you can demonstrate reasonable attempts to comply. However, this is not guaranteed, and relying on leniency is not a strategy.

How to Prepare Now

If your qualifying income exceeds £50,000, you need to be ready by April 2026. Here is a step-by-step preparation plan:

1. Check your eligibility: Review your income from the previous tax year to determine which bracket you fall into. If you are near the £50,000 threshold, you may still be required to join from April 2027.
2. Choose your software: Select an MTD-compatible software package that suits your business. If you already use inventory management software or a POS system, check whether it includes MTD ITSA support.
3. Start digitising your records now: If you still use paper records or basic spreadsheets, begin transitioning to digital record-keeping. Your software must be able to trace every transaction back to its source.
4. Register for MTD ITSA: You can register through your HMRC online account or through your software provider. HMRC will notify you when registration opens for your income bracket.
5. Run a test: Submit a mock quarterly update before the first deadline to ensure your software, data, and processes are working correctly.

How Aphelios Software Helps

Aphelios Software is designed for sole traders and small businesses who need more than just accounting software. If you sell products - whether at a market stall, online, or from a shop - Aphelios combines inventory management, POS, and financial reporting in a single cloud-based platform.

Here is what makes Aphelios a strong choice for MTD compliance:

• Real-time digital records: Every sale, expense, and stock movement is recorded digitally, satisfying HMRC's digital record-keeping requirements without any extra effort.
• Automated quarterly summaries: Generate income and expense reports for each quarter that map directly to MTD ITSA submission requirements.
• All-in-one platform: No need to juggle separate POS, inventory, and accounting tools. One login, one system, one source of truth.
• Cloud-based access: Manage your business and submit updates from anywhere - your phone, tablet, or laptop.
• Affordable pricing: Unlike enterprise accounting platforms that charge per user and per feature, Aphelios offers a flat, transparent pricing structure built for small businesses.

Whether you are a freelance photographer, a market trader, a consultant, or a property landlord, Aphelios Software gives you the tools to stay on top of your tax obligations while running your business efficiently.

Common Mistakes to Avoid

As the April 2026 deadline approaches, here are the most common mistakes sole traders make:

• Leaving it too late: Waiting until March 2026 to choose software and set up digital records is a recipe for non-compliance. Start now.
• Assuming spreadsheets are enough: Excel and Google Sheets are not MTD-compatible on their own. You need bridging software or a proper MTD platform.
• Ignoring the quarterly cadence: The shift from one annual return to four quarterly updates is a significant change in workflow. Build it into your routine.
• Mixing personal and business finances: Digital records must clearly separate business transactions from personal ones. Use a dedicated business bank account.
• Forgetting about the end-of-year declaration: Quarterly updates are not the final word. You still need to submit your end-of-year declaration and make any balancing payments.

MTD for Income Tax vs MTD for VAT

If you are already registered for VAT and complying with MTD for VAT, you might wonder how MTD for Income Tax differs. Here are the key distinctions:

• Scope: MTD for VAT applies only to VAT-registered businesses. MTD for Income Tax applies to all qualifying sole traders and landlords above the income threshold, regardless of VAT registration.
• Frequency: VAT returns are submitted quarterly (or monthly/annually for some). MTD for Income Tax quarterly updates follow a different tax-year calendar.
• Content: VAT returns report on VAT charged and paid. MTD for Income Tax updates report on total income and expenses for income tax purposes.
• End-of-year process: VAT has a final annual accounting period. MTD for Income Tax requires a separate end-of-year declaration that replaces the Self Assessment tax return.

If you are subject to both, you need software that can handle both obligations. Some platforms, including Aphelios Software, are being developed to support multiple MTD streams, reducing the complexity of managing separate systems.

Frequently Asked Questions

What is the income threshold for Making Tax Digital for Income Tax in 2026?

From April 2026, Making Tax Digital for Income Tax (MTD ITSA) applies to self-employed individuals and landlords with qualifying income above £50,000. From April 2027, the threshold drops to £30,000, and from April 2028, it will cover those earning over £20,000.

How often do sole traders need to submit quarterly updates under MTD for Income Tax?

Under MTD for Income Tax, sole traders must submit quarterly digital updates to HMRC. The quarterly periods run from April to June, July to September, October to December, and January to March. Each update must be submitted within one month of the end of the quarter.

What software do I need for MTD for Income Tax?

You must use HMRC-recognised MTD-compatible software to keep digital records and submit quarterly updates. This can be commercial software like Aphelios, FreeAgent, or Xero, or HMRC's own free basic tool for those with simple tax affairs. Spreadsheets alone do not comply unless paired with bridging software.

What are the penalties for not complying with MTD for Income Tax?

HMRC operates a points-based penalty system for late quarterly submissions. Each missed deadline earns one penalty point, and once you reach the threshold (4 points within 12 months for quarterly filers), you receive a £200 fixed penalty. Late payment penalties also apply after 15 days, escalating after 30 days and beyond.