Making Tax Digital for Income Tax Self Assessment — commonly known as MTD ITSA — is the most significant change to how UK taxpayers report their income since Self Assessment was introduced in 1996. If you’re a sole trader, landlord, or individual with qualifying income above the mandated threshold, this MTD ITSA Guide 2026 is your essential reference for understanding what has changed, how the new system works, and what you need to do to comply.

For a single business or property portfolio, MTD ITSA involves four quarterly updates plus one year-end Final Declaration — five submissions in total. Note that if you run multiple businesses or hold both trade and rental income, HMRC requires four quarterly updates for each separate income source, though you will still only submit one end-of-year tax return (sometimes referred to as the Final Declaration)

Whether you’re a sole trader preparing to comply, a landlord managing rental properties, an accountant advising clients, or simply trying to understand your obligations, this guide covers every element — verified against official HMRC guidance and updated for July 2026.

What Is MTD ITSA?

Making Tax Digital for Income Tax (MTD ITSA) is a UK government programme requiring individuals with business or property income above certain thresholds to maintain digital records and submit quarterly updates to HMRC using compatible software. According to HMRC’s official guidance, it is “a new way for sole traders and landlords to report their income and expenses to HMRC.”

Instead of relying solely on one annual Self Assessment tax return, taxpayers within MTD for Income Tax keep digital records, submit quarterly updates throughout the year, and complete an end-of-year tax return (Final Declaration)

The programme builds on Making Tax Digital for VAT, which has been mandatory for all VAT-registered businesses since April 2022. However, MTD ITSA affects a far larger population — potentially over millions of sole traders and landlords. If you’re already familiar with MTD VAT bridging software, many of the same principles apply to Income Tax filing.

Who Must Comply with MTD ITSA?

According to HMRC’s eligibility guidance, you need to use Making Tax Digital for Income Tax if all of the following apply:

• You’re a sole trader or landlord registered for Self Assessment
• You get income from self-employment or property (or both)
• Your qualifying income is more than the relevant threshold for the tax year

Who is within scope:

Sole traders — self-employed individuals regardless of their trade, whose qualifying income exceeds the threshold. This includes freelancers, contractors, tradespeople, and anyone with self-employment tax obligations.

Landlords — individuals receiving rental income from UK or overseas property where total property income exceeds the threshold. Our MTD software for landlords page explains how this applies to property businesses specifically.

Combined income earners — for example, if you have £27,000 from self-employment and £25,000 from property, your qualifying income is £52,000 and you fall within Phase 1 scope. HMRC qualifying income guidance →

Who is NOT currently required:

Partnerships — general partnerships, LLPs and other partnership structures are not yet mandated. HMRC will announce a start date separately.

Limited companies — Corporation Tax is separate; MTD ITSA applies to individuals only.

Below-threshold earners — though they may sign up voluntarily.

Digitally excluded individuals — Some individuals may be exempt or deferred from MTD for Income Tax because of their circumstances. Check the latest HMRC exemption guidance or use HMRC’s eligibility checker.

MTD ITSA Guide 2026: Eligibility Thresholds & Implementation Dates

The rollout of making tax digital for income tax is phased by income threshold, with higher earners mandated first. The thresholds are confirmed by HMRC’s official guidance:

For a broader view of all Making Tax Digital deadlines including VAT, see our detailed guide on Making Tax Digital deadlines UK 2026.

Quarterly Updates HMRC: How They Work

The shift from one annual return to quarterly updates is the most visible change under MTD ITSA. According to HMRC’s guidance on quarterly updates, your compatible software adds together your digital records every 3 months, creating totals for your income and expenses. These are “summaries, not tax returns.”

You need to send quarterly updates to HMRC every 3 months for each self-employment and property business you have. You do not need to make any accounting or tax adjustments before sending a quarterly update.

MTD Deadlines 2026: Quarterly Update Schedule

Source: HMRC update periods and deadlines

What must be included in each update

Each quarterly update includes totals for each income and expense category you’ve used — the same categories as Self Assessment. You can read about the categories in the HMRC Quarterly Update Direction. HMRC does not receive individual receipts or invoices.

Standard vs calendar update periods

You can choose between standard update periods (aligned to the tax year: 6 April to 5 April) or calendar update periods (1 April to 31 March). You choose in your software before your first submission and cannot change mid-year. HMRC update period guidance →

Nil updates

Even if you had no income or expenses in a period, you must still send a quarterly update confirming this. This applies to each business source separately — if you have a self-employment and a property business, both need updates.

Digital Record Keeping Requirements

Under MTD ITSA, all taxpayers within scope must maintain digital records of their business transactions. It is not sufficient to keep paper records and type summaries into software at the end of each quarter. HMRC’s digital records guidance sets out exactly what is required.

What you must record

Digital records generally need to include the amount, the date the income was received or expense incurred, and the relevant category. HMRC allows certain simplified recording methods in specific circumstances.

Digital links: The critical compliance point

If you use separate software for MTD digital records and submissions, the relevant record-keeping and submission software must be digitally linked where required by HMRC’s rules. Once a digital record has been sent to HMRC in a quarterly update, HMRC explicitly states you must not: HMRC digital records guidance →

• Copy information by writing it out in another cell or in other software
• Use ‘cut and paste’ or ‘copy and paste’ to move records

Acceptable digital links include:

• Linked cells in spreadsheets — formulas mirroring values from other cells/sheets (e.g., one sheet for records, another for totals using cell references)
• CSV or XML import/export between systems
• Automated data transfer via API
• Emailing a spreadsheet to be imported into another product
• Physical transfer via USB for import

For a detailed walkthrough of maintaining compliant digital links with spreadsheets, see our blog on digital records and digital links for MTD-friendly spreadsheets.

Simpler categorisation for smaller businesses

HMRC allows simpler categorisation of digital records in certain circumstances, including where turnover from a self-employment or UK property source is below the VAT threshold. The exact categorisation requirements depend on the type of income source and your circumstances. Check the current HMRC guidance before relying on simpler categorisation.

How long to keep records

You must keep your digital records for at least 5 years after the 31 January submission deadline for that tax year — the same retention period as Self Assessment. HMRC record retention guidance →

The Final Declaration (Tax Return)

After your four quarterly updates have been submitted, you must file a tax return — the Final Declaration under MTD ITSA. It confirms your complete income, claims, allowances, and reliefs for the entire tax year. HMRC guidance on submitting your MTD tax return →

The Final Declaration is where you bring together all sources of income, not just those reported quarterly. This includes employment income (PAYE), dividends, savings interest, capital gains, pension income, and any other taxable amounts. You also claim reliefs and allowances — pension contributions, Gift Aid, trading/property allowances, capital allowances, and loss relief.

The deadline for the Final Declaration is 31 January following the end of the tax year. For the 2026-27 tax year, this means 31 January 2028.

For step-by-step filing guidance, visit our pages on how to file Self Assessment as an individual or how to file Self Assessment as an agent.

MTD ITSA Penalties: What Happens If You Don’t Comply

HMRC has introduced a new points-based penalty regime for MTD ITSA, replacing the previous fixed-penalty system. Full details are in HMRC’s penalties guidance (published March 2026).

Late Submission Penalties (from 2027-28 onwards)

Each missed quarterly update or tax return deadline results in one penalty point. The penalty threshold is 4 points: HMRC penalties guidance →

• At 4 points, a £200 penalty is charged
• Each subsequent late submission incurs another £200 penalty
• You can only get one point per deadline (even if you have multiple businesses)
• Below 4 points: each point is automatically removed 24 months after the missed deadline At 4 points: you must:
  1. submit quarterly updates and tax returns on time for 12 months
  2. bring outstanding quarterly updates and tax returns from the previous 24 months up to date

Late Payment Penalties

Source: HMRC penalties for MTD Income Tax (updated 30 March 2026)

Late payment interest also applies from the day after the due date at the Bank of England base rate plus 2.5%.

For a broader overview of Self Assessment penalties and how to avoid fines, see our guide on Self Assessment deadlines and penalties UK.

Benefits of Making Tax Digital for Income Tax

Whilst the transition demands effort, making tax digital income tax delivers genuine practical benefits for compliant taxpayers:

Choosing HMRC-Recognised MTD Software

You must use software that is compatible with HMRC’s MTD ITSA systems. HMRC maintains an official list via their software finder tool. You should choose compatible software that meets HMRC’s MTD for Income Tax requirements. HMRC’s official software finder can help you find and compare compatible products.

Our guide to HMRC-recognised MTD software 2026 covers what to look for in detail. Here’s a quick comparison of the main software types:

Software Comparison Table

For those who already use spreadsheets and want to continue without migrating to full accounting software, bridging solutions offer the most practical path to compliance. Explore the differences on our MTD Bridge vs HMRC Portal comparison page, or read our complete guide to MTD bridging software UK 2026.

For sole traders specifically, our MTD software for sole traders page explains how 11 MTD Bridge handles the filing process. For Excel-based workflows, see our VAT bridging software for Excel page (Income Tax filing uses the same spreadsheet-to-HMRC approach).

MTD ITSA Compliance Checklist

Use this checklist to confirm your readiness. Phase 1 taxpayers (income over £50,000) should have completed all steps by now. Phase 2 taxpayers should be working through this before April 2027:

Common Mistakes to Avoid

Based on the experience of MTD for VAT early adopters and the MTD ITSA pilot, these are the most frequent — and most avoidable — errors:

Expert Tips for a Smooth MTD ITSA Transition

Frequently Asked Questions

Conclusion: Your MTD ITSA Guide 2026 — Act Now

Making Tax Digital for Income Tax is not a future prospect — it is live now for Phase 1 taxpayers. If your qualifying income exceeded £50,000 on your 2024-25 Self Assessment return, you should already be keeping digital records and your first quarterly update is due by 7 August 2026. Sign up now if you haven’t already →

This MTD ITSA Guide 2026 has covered every element of the new regime: who must comply, income thresholds, the quarterly update schedule and deadlines, digital record keeping obligations, the Final Declaration process, the penalty framework (including the 2026-27 grace period), and the genuine benefits that consistent digital compliance delivers. All dates, thresholds, and penalty rules have been verified against official GOV.UK sources linked throughout.

The single most important step you can take today is ensuring you have HMRC-recognised software in place. For sole traders, landlords, and accountants who rely on spreadsheets, 11 MTD Bridge provides the simplest route — bridging the gap between your records and HMRC without forcing a workflow overhaul or committing to expensive monthly subscriptions.

Use the grace period wisely. Establish good habits now so that when full penalties apply from 2027-28, compliance is second nature.

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