Executive Summary
Making Tax Digital for Income Tax Self Assessment (MTD for ITSA) is the most significant change to UK tax administration in a generation. From April 2026, self-employed individuals and landlords with gross income exceeding £50,000 will be required to keep digital records and submit quarterly updates to HMRC through compatible software.
This white paper cuts through the complexity to give you a clear, actionable guide. We cover who's affected, what changes in practice, which software to choose, what the penalties are for non-compliance, and provide a step-by-step readiness checklist.
What is MTD for Income Tax?
MTD for Income Tax replaces the traditional annual Self Assessment tax return with a digital-first system. Instead of reporting your income once per year, you'll submit quarterly updates through HMRC-recognised software, followed by a final declaration.
The Three Core Requirements
- Digital record-keeping: All business income and expenses must be recorded digitally using compatible software. Spreadsheets alone will not be sufficient — they must feed into recognised software.
- Quarterly updates: Summary data must be submitted to HMRC within one month of each quarter end. These are estimates and can be corrected later.
- Final declaration: An end-of-year submission (replacing the SA tax return) confirming total income, allowances, and tax due. Due by 31 January following the tax year.
Important: Quarterly updates are not the same as paying tax quarterly. Payment dates remain unchanged — you still pay through the existing payment on account system. The quarterly updates are information submissions only.
Who Is Affected?
MTD for Income Tax is being rolled out in phases based on gross income thresholds:
| Category | Income Threshold | From | Estimated Taxpayers |
|---|---|---|---|
| Self-employed individuals | Gross income > £50,000 | April 2026 | 780,000 |
| Self-employed individuals | Gross income > £30,000 | April 2027 | 1,400,000 |
| Landlords (property income) | Gross income > £50,000 | April 2026 | 320,000 |
| Landlords (property income) | Gross income > £30,000 | April 2027 | 680,000 |
| Partnerships (individual partners) | TBC — likely 2027 | April 2027 (est.) | 450,000 |
Who Is NOT Affected (Yet)?
- Limited companies — MTD for Corporation Tax is expected no earlier than 2028.
- Self-employed with income below £30,000 — currently exempt, though future extensions are possible.
- PAYE employees with no self-employment or property income.
- Non-UK tax residents (unless they have UK property income above the threshold).
Key Deadlines
For the 2026/27 tax year (the first full year under MTD for ITSA), the deadlines are:
| Period | Deadline | Action Required |
|---|---|---|
| Q1 (Apr–Jun 2026) | 5 Aug 2026 | First quarterly update due |
| Q2 (Jul–Sep 2026) | 5 Nov 2026 | Second quarterly update |
| Q3 (Oct–Dec 2026) | 5 Feb 2027 | Third quarterly update |
| Q4 (Jan–Mar 2027) | 5 May 2027 | Fourth quarterly update |
| Year End | 31 Jan 2028 | Final declaration (replaces SA return) |
Miss a quarterly deadline by even one day and you'll face an automatic £100 penalty. These add up fast: a business that misses all four quarterly deadlines in a year could face £800+ in late filing penalties alone.
What Changes in Practice
Before MTD (Current System)
- Keep records (paper or digital — your choice).
- Complete one Self Assessment return per year.
- Submit by 31 January following the tax year.
- Pay any tax due by 31 January (with payments on account in January and July).
After MTD (From April 2026)
- Keep ALL records digitally using HMRC-recognised software.
- Submit quarterly updates within one month of each quarter end.
- Submit a final declaration by 31 January.
- Payment dates remain the same — but HMRC will have much more visibility of your income throughout the year.
The Real Impact
For businesses already using cloud accounting software and maintaining their books regularly, the practical change is minimal — your bookkeeper simply submits quarterly updates alongside their existing work. For businesses still using spreadsheets, shoeboxes of receipts, or annual accounts only, the change is fundamental and requires immediate action.
Software Comparison
HMRC maintains a list of recognised software for MTD for Income Tax. Here's how the main platforms compare:
| Feature | Xero | QuickBooks | Sage | FreeAgent |
|---|---|---|---|---|
| MTD for ITSA ready | ✅ | ✅ | ✅ | ✅ |
| Quarterly update automation | ✅ | ✅ | ✅ | ✅ |
| Bank feed integration | ✅ | ✅ | ✅ | ✅ |
| Property income tracking | Add-on | Limited | ✅ | ✅ |
| Multi-business support | ✅ | Limited | ✅ | ❌ |
| Agent access for bookkeeper | ✅ | ✅ | ✅ | ✅ |
| Starting price (ex VAT/month) | £15 | £12 | £12 | £10 |
| Included VAT filing | ✅ | ✅ | ✅ | ✅ |
All four major platforms are MTD-ready. The choice should depend on your specific needs: FreeAgent is excellent for sole traders, Xero offers the best app ecosystem, QuickBooks is the most intuitive for beginners, and Sage has the strongest UK compliance features.
Penalties for Non-Compliance
HMRC has confirmed a new points-based penalty system for MTD. Late submissions accrue points, and once a threshold is reached, automatic financial penalties apply.
| Offence | First Occurrence | Repeated | Notes |
|---|---|---|---|
| Late filing (1 day) | £100 | £200 | Per quarter |
| Late filing (30 days) | £200 | £400 | Per quarter |
| Late filing (6 months) | £300 | £600 | Plus interest |
| Late filing (12 months) | £500 | £1,000 | Plus penalties |
| Inaccurate return (careless) | £Up to 30% | £Up to 30% | Of tax due |
| Inaccurate return (deliberate) | £Up to 70% | £Up to 70% | Of tax due |
| Failure to keep records | £3,000 | £3,000 | Maximum |
The maximum penalty for a deliberate inaccuracy with concealment is 100% of the tax due. For a taxpayer with £20,000 in unreported income taxed at 40%, that's a £8,000 penalty on top of the £8,000 tax owed — £16,000 total.
Readiness Checklist
Use this checklist to ensure you're ready for MTD. Each item is prioritised by urgency:
| Action | Priority | By When | Notes |
|---|---|---|---|
| Register for MTD for Income Tax via HMRC | Critical | Before April 2026 | Required for all in scope |
| Choose MTD-compatible software | Critical | Before April 2026 | See comparison table |
| Connect all bank accounts via bank feeds | High | March 2026 | Essential for quarterly updates |
| Set up digital record-keeping | High | March 2026 | Paper records no longer sufficient |
| Clean up chart of accounts | Medium | February 2026 | Ensure correct categorisation |
| Review income categories | Medium | February 2026 | Trading vs property vs other |
| Appoint bookkeeper/agent | High | January 2026 | Agent can file on your behalf |
| Run a practice quarterly update | Medium | March 2026 | Test the process before it's mandatory |
| Set calendar reminders for deadlines | Low | April 2026 | 5 deadlines per year |
Recommendations
- Don't wait until April 2026. Start using MTD-compatible software now — give yourself and your bookkeeper time to adapt.
- If you're currently using spreadsheets, make the switch to cloud software immediately. The learning curve takes 2–3 months.
- Appoint a bookkeeper or agent who is already experienced with MTD for VAT — the quarterly submission process is very similar.
- Run a 'shadow year' from April 2025: maintain your books as if MTD were already live, including practice quarterly submissions.
- Set up automated bank feeds and digital receipt capture. These eliminate the biggest bottleneck in quarterly reporting.
- Budget for the software cost (£120–300/year) and bookkeeper fees — these are allowable business expenses.
MTD for Income Tax is coming whether you're ready or not. The businesses that prepare now will find it a minor administrative adjustment. Those that leave it to the last minute will face stress, errors, and penalties.
