Making Tax Digital for Income Tax Self Assessment (MTD ITSA) becomes legally mandatory in the UK on 6 April 2026 for sole traders and unincorporated landlords with gross qualifying business or property income exceeding £50,000. Under the new regime, paper records and annual Self Assessment returns are replaced with digital record-keeping in MTD-compatible software, four mandatory quarterly updates to HM Revenue & Customs, and a year-end Final Declaration.
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Key Statutory Dates, Thresholds & HMRC Rules
- Phase 1 Mandate (6 April 2026): Mandatory for self-employed individuals and landlords with gross income over £50,000. [Source: GOV.UK]
- Phase 2 Mandate (6 April 2027): Threshold lowers to gross qualifying income over £30,000.
- Phase 3 (Review): Individuals earning between £20,000 and £30,000 remain under government review; no start date has been legislated. Earners under £20,000 are formally exempt.
- Gross Income Test: Thresholds test gross turnover/revenue before any expense deductions, not net taxable profit. If you have £52,000 rental turnover and £30,000 mortgage interest and maintenance costs (£22,000 net profit), you are still mandated in Phase 1.
- Cumulative Income Test: Sole trader turnover and rental turnover are combined together to test the threshold.
- Four Quarterly Submissions: Standard quarterly summary filing deadlines are 5 August (Q1), 5 November (Q2), 5 February (Q3), and 5 May (Q4).
- Year-End Final Declaration: Due by 31 January following the end of the tax year (replacing the traditional SA100 return).
- Points-Based Penalty Regime: Late quarterly submissions trigger 1 penalty point. Accumulating 4 points triggers an automatic statutory financial penalty (currently £200).
What is Making Tax Digital for Income Tax?
Making Tax Digital (MTD) is the biggest overhaul of the UK personal taxation framework since the introduction of Self Assessment in 1996. After rolling out to VAT-registered businesses, HMRC is expanding MTD to personal Income Tax Self Assessment (ITSA).
Instead of compiling receipts once a year in January to complete an annual SA100 tax return, affected sole traders and landlords must maintain digital accounting records and transmit quarterly summaries directly to HMRC using recognised commercial software.
Crucially, quarterly updates are not full tax returns. They do not require complex tax adjustments, capital allowance claims, or accounting accruals — they are simply cumulative summaries of income received and allowable expenses incurred during the quarter.
Who is Mandated? The Gross Income Rule
The single most common misunderstanding among self-employed workers and property owners is confusing taxable profit with qualifying turnover.
HMRC determines your MTD obligation based on your total gross qualifying income reported on your prior Self Assessment tax return:
- Self-employed sole trader turnover (gross invoices/sales before expenses)
- PLUS gross property rental income (gross rent collected before mortgage interest, agent fees, or repairs)
Partnerships, limited companies, and trust income are not included in the individual threshold test (limited companies are subject to Corporation Tax and are not affected by MTD ITSA).
Worked Example: Sole Trader & Buy-to-Let Landlord
To see how HMRC evaluates MTD eligibility, examine Sarah, a self-employed graphic designer who also owns a buy-to-let residential flat in Leeds:
| Income Stream | Gross Turnover | Allowable Expenses | Net Taxable Profit |
|---|---|---|---|
| Freelance Design Business | £36,000.00 | £8,000.00 | £28,000.00 |
| Rental Property Income | £18,000.00 | £9,500.00 | £8,500.00 |
| Combined Totals | £54,000.00 (Gross Test) | £17,500.00 | £36,500.00 (Net Profit) |
The Verdict: While Sarah’s net taxable profit is only £36,500, her gross qualifying turnover is £54,000.00 (£36,000 + £18,000). Because £54,000 exceeds the £50,000 statutory limit, she must comply with MTD ITSA from 6 April 2026. She cannot wait for the 2027 Phase 2 threshold.
The Compliance Calendar: Deadlines You Must Meet
Under MTD ITSA, standard calendar quarterly periods and statutory deadlines run as follows:
| Filing Event | Period Covered | Statutory Submission Deadline |
|---|---|---|
| Quarter 1 Update | 6 April to 5 July | 5 August |
| Quarter 2 Update | 6 July to 5 October | 5 November (Autumn Deadline) |
| Quarter 3 Update | 6 October to 5 January | 5 February |
| Quarter 4 Update | 6 January to 5 April | 5 May |
| Final Declaration | Full Tax Year (6 April to 5 April) | 31 January following tax year |
Calendar Quarter Election: Under HMRC regulations, taxpayers may formally elect to align their quarters with standard calendar months (ending 30 June, 30 September, 31 December, and 31 March). The statutory submission deadlines remain the 5th of the second month following.
Software Requirements: Can You Still Use Spreadsheets?
HMRC does not provide its own free portal for filing MTD quarterly updates. You must use software that connects directly to HMRC’s application programming interface (API).
You have two primary software routes:
- Commercial Cloud Accounting Software: Packages such as Xero, QuickBooks, FreeAgent, or Sage that maintain digital transaction ledgers and file directly via API.
- Spreadsheets with Bridging Software: You can continue keeping income and expense records in Microsoft Excel or Google Sheets, provided you use dedicated HMRC-approved ‘bridging software’ to digitally extract the summary totals and send them to HMRC without manual re-keying or copying and pasting.
The Points-Based Penalty System
HMRC has replaced the harsh automatic £100 late-filing fines with a points-based penalty regime designed to punish persistent non-compliance rather than occasional mistakes:
- Each late quarterly submission earns 1 penalty point.
- Points have an expiration period (typically 24 months of full compliance).
- For quarterly filers, reaching 4 penalty points triggers an automatic £200 fine.
- Every subsequent late filing while at the 4-point threshold incurs another immediate £200 fine.
- Separate financial interest charges apply to late payments of actual tax due.
Frequently Asked Questions
When does Making Tax Digital for Income Tax start?
Making Tax Digital for Income Tax Self Assessment (MTD ITSA) becomes legally mandatory on 6 April 2026 for sole traders and landlords with gross income over £50,000. The threshold drops to £30,000 from 6 April 2027. Phase 3 (threshold over £20,000) is planned for future review.
Is the £50,000 threshold based on turnover or profit?
The threshold is based strictly on gross turnover — your total business receipts before deducting any allowable business expenses, mortgage interest, or capital allowances. If your gross turnover is £52,000 and your net profit is only £18,000, you are still legally required to comply with MTD from April 2026.
Do landlords have to comply with MTD?
Yes. Unincorporated residential and commercial landlords must comply if their gross rental property income (or combined rental income and sole trader turnover) exceeds £50,000 in April 2026 or £30,000 in April 2027. Jointly owned property income is assessed based on each individual owner’s qualifying share.
What are the four quarterly deadlines for MTD?
Quarterly updates must be submitted to HMRC within one month of the end of each quarter: 5 August (Quarter 1: 6 April – 5 July), 5 November (Quarter 2: 6 July – 5 October), 5 February (Quarter 3: 6 October – 5 January), and 5 May (Quarter 4: 6 January – 5 April).
Do you pay tax four times a year under MTD?
No. MTD ITSA changes the frequency of reporting, not the timing of tax payments. You will still pay your liability (estimated using our Take-Home Pay Calculator and Income Tax Calculator) under the existing Self Assessment schedule: balancing payment and first payment on account on 31 January, and the second payment on account on 31 July.
What digital records do I need to keep for MTD?
You must digitally record every business transaction: date of transaction, invoice or payment amount, and expense category. Records must be stored in HMRC-compatible software. Manual paper ledgers or unlinked spreadsheets are non-compliant, as HMRC requires continuous digital links from raw transaction to submission.
Can you still use Excel or Google Sheets for MTD?
Yes, but only if you use HMRC-approved ‘bridging software’. Bridging software digitally extracts data directly from your spreadsheet cells and transmits it securely to HMRC via an API. You cannot manually type or copy-and-paste summary numbers between your spreadsheet and HMRC.
What software do I need, and is free MTD software available?
You need HMRC-recognised software capable of creating digital records and sending quarterly updates. Commercial providers include Xero, QuickBooks, FreeAgent, and Sage. HMRC maintains a list of approved providers, and several vendors provide free-tier software for simple sole traders with basic accounting needs.
Can I do MTD myself without an accountant?
Yes. The software is designed to allow sole traders and landlords to record receipts and submit quarterly summaries directly to HMRC. However, an accountant or tax agent can still review your figures, submit updates on your behalf, and prepare your year-end Final Declaration.
Do I still file a Self Assessment tax return alongside MTD?
No. The traditional annual SA100 Self Assessment tax return is replaced by a year-end ‘Final Declaration’. By 31 January following the tax year end, you submit your Final Declaration via software, bringing together your 4 quarterly updates, accounting adjustments, personal reliefs, and other income sources.
Who is exempt from Making Tax Digital for Income Tax?
Sole traders and landlords with gross qualifying income under £30,000 are exempt from the initial phases (and those under £20,000 permanently exempt). Limited companies, trustees, personal representatives, and digitally excluded individuals (e.g. on religious grounds, remote lack of internet, or severe disability) can apply to HMRC for exemption.
What is the penalty for missing a quarterly MTD update?
HMRC enforces a points-based penalty system. Each late quarterly submission incurs 1 penalty point. For quarterly filers, reaching 4 points triggers an automatic £200 fine, with further £200 fines for every subsequent late submission. Points expire after 24 months of full compliance.
Will HMRC tell me if I need to join MTD?
HMRC writes to taxpayers identified as meeting the threshold based on previous Self Assessment tax returns. However, the legal responsibility rests on you to assess your gross income and register for MTD ITSA before the 6 April 2026 deadline even if you do not receive a letter.
Do I need to link my bank account for MTD?
Linking your bank account via Open Banking bank feeds is not legally mandatory, but it is strongly recommended. Live bank feeds automatically pull transactions into your software, eliminating manual entry errors and ensuring digital record compliance with HMRC guidelines.