What MTD ITSA is and who it affects
Making Tax Digital for Income Tax Self Assessment (MTD ITSA) is the most significant change to personal tax administration in the UK since the introduction of Self Assessment itself. It replaces the annual Self Assessment tax return cycle — for those in scope — with a year-round digital compliance process built around quarterly submissions and digital record-keeping.
The programme has been delayed several times since it was first announced in 2015. The current mandation schedule — April 2026 for income above £50,000, April 2027 for income above £30,000 — represents the most recent government commitment, confirmed in the 2023 Autumn Statement. A further extension to income above £20,000 has been proposed for April 2028 but is not yet confirmed in primary legislation.
MTD ITSA affects self-employed individuals and property landlords. Employed-only individuals, pensioners, and those whose income comes solely from savings, dividends, or capital gains are not in scope. The key question for Harrow sole traders and landlords is whether their qualifying income — defined specifically for MTD purposes — exceeds the relevant threshold.
What qualifying income means for Harrow taxpayers
Qualifying income for MTD ITSA is the combined gross income from self-employment and property — before any expenses are deducted. This is an important distinction that surprises many Harrow sole traders and landlords who calculate their income net of costs.
| Income type | Counts towards qualifying income? |
|---|---|
| Self-employment income (gross, before expenses) | Yes |
| Property / rental income (gross, before expenses) | Yes |
| PAYE employment income | No |
| Dividends | No |
| Savings and bank interest | No |
| Pension income | No |
| Capital gains | No |
For a Harrow IT contractor whose limited company pays them a £12,570 salary and £40,000 in dividends — but who also has a buy-to-let property generating £18,000 gross rent — the qualifying income is £18,000 (the rental income only, since the company income is not self-employment income). This contractor is below the £30,000 threshold and not in scope for April 2027.
By contrast, a Pinner sole trader consultant earning £60,000 gross from consultancy — even if their net profit after expenses is only £42,000 — has qualifying income of £60,000 and is in scope from April 2026. The gross figure is what counts.
The four MTD ITSA compliance requirements
MTD ITSA replaces the single annual Self Assessment return with a four-stage annual compliance cycle:
Digital record-keeping
You must maintain digital records of your income and expenses using HMRC-approved software throughout the year. Paper records or spreadsheets not linked to approved software are not compliant under MTD ITSA. The records must capture each transaction individually — summary entries are not acceptable.
Quarterly updates
You must submit a quarterly summary of your income and expenses to HMRC within one calendar month of each quarter end. The four quarterly periods and their submission deadlines are:
| Quarter period | Submission deadline |
|---|---|
| 6 April – 5 July | 5 August |
| 6 July – 5 October | 5 November |
| 6 October – 5 January | 5 February |
| 6 January – 5 April | 5 May |
End of Period Statement (EOPS)
After the tax year ends, you submit an End of Period Statement confirming the annual totals, making any necessary adjustments (such as capital allowances claims), and finalising the figures for each income source. This is submitted after the year-end — the exact deadline depends on when the Final Declaration is filed.
Final Declaration
The Final Declaration replaces the current Self Assessment return. It confirms the total tax position for the year across all income sources — including those not reported through MTD quarterly updates (such as employment income, dividends, and capital gains). The Final Declaration deadline remains 31 January following the end of the tax year.
Approved software for MTD ITSA
HMRC maintains a list of software approved for MTD ITSA digital record-keeping and quarterly submissions. The software must be capable of connecting directly to HMRC's systems via API. Standalone spreadsheets are not MTD-compliant unless connected to HMRC-approved bridging software.
| Software | Best for | Approx. monthly cost |
|---|---|---|
| QuickBooks | Sole traders with invoicing, multi-category expenses | £10–£35/mo |
| Xero | Small businesses, accountant-integrated workflows | £15–£42/mo |
| Sage | Established businesses, VAT + payroll integration | £12–£33/mo |
| FreeAgent | Freelancers, contractors — often free via Natwest/RBS | £19/mo or free with bank |
| Coconut | Sole traders and landlords — bank-connected simple tracking | £5–£10/mo |
The right software choice for a Harrow sole trader or landlord depends on the complexity of their business, whether they are VAT-registered, whether they have employees, and how their accountant prefers to work. A Northolt Park tradesperson with simple cash income and a handful of expense categories needs different software from a Canons Park consultant with multiple clients, foreign currency invoices, and a VAT return to file quarterly. Your accountant should advise on the most appropriate option before you commit to a subscription.
How your accountant fits into the MTD process
MTD ITSA does not eliminate the need for an accountant — it changes the nature of the relationship. Instead of a once-a-year data collection exercise to prepare the Self Assessment return, MTD creates a more continuous working relationship throughout the year. Harrow accountants who work with MTD clients typically structure the engagement as:
Software selection, configuration, and connection to HMRC's API. Bank account linking. Chart of accounts setup appropriate for the business type. Training on how to categorise transactions correctly.
Review of the quarterly records before submission — checking categorisation, identifying missing transactions, and confirming figures before the quarterly update is submitted to HMRC. Some accountants submit on the client's behalf as a registered agent.
End of Period Statement preparation — adjustments for capital allowances, private use proportions, and any other year-end adjustments. Final Declaration preparation covering all income sources including those outside MTD (dividends, capital gains, employment income).
Quarterly touchpoints create natural opportunities for tax planning conversations — pension contributions before year-end, timing of equipment purchases, VAT scheme review — that previously only happened once a year at return time.
What happens if you are not MTD-ready
HMRC has stated that a points-based penalty system will apply to late MTD ITSA quarterly submissions — similar to the system already in operation for VAT. Each late quarterly submission earns a penalty point. When points accumulate to the threshold (four points for quarterly filers), a £200 penalty is charged. Points reset after a period of full compliance.
Missed a quarterly deadline?
A single missed quarterly submission earns one penalty point — no immediate financial penalty. But accumulating four points triggers a £200 charge, and further missed submissions add £200 each. The pattern of four quarterly submissions means a consistently non-compliant taxpayer can accumulate the full £200 penalty within 12 months of the mandate applying, with ongoing £200 charges for each subsequent missed submission.
Beyond the direct penalty risk, Harrow sole traders and landlords who have not transitioned to MTD-compatible software before the mandate applies will face a disruptive forced migration — updating historical records, connecting systems, and learning new processes at the same time as meeting live quarterly deadlines. Preparing in advance is significantly less painful and less costly than reactive compliance.
Action plan for Harrow businesses and landlords
Check if you are in scope
Add together your gross self-employment income and gross rental income (before any expenses). If the combined figure exceeds £50,000, you are in scope from April 2026. If it exceeds £30,000, you are in scope from April 2027.
Choose your software now
Don't wait until the mandate applies. Choosing, setting up, and learning MTD-compatible software takes time. Starting a year before the mandate lets you identify what works for your business without the pressure of live quarterly deadlines.
Talk to your accountant
Your accountant should already be advising on MTD preparation. If they haven't raised it, ask them directly. A Harrow accountant experienced with MTD will advise on software selection, setup, and how they plan to support you through quarterly submissions.
If you don't have an accountant — get one
MTD ITSA makes professional accountancy support more valuable, not less. Quarterly compliance obligations, digital record-keeping requirements, and the ongoing year-round relationship make an accountant a practical necessity for most Harrow sole traders and landlords in scope.
Clean up your records
Before migrating to MTD software, ensure your historical records are accurate. Unresolved discrepancies from prior years create problems when systems are connected and data is visible to HMRC in near-real-time.
Our matched Harrow accountants are already preparing clients for MTD ITSA — advising on software, setting up digital records, and building the quarterly workflow before the mandate applies.
Self Assessment Tax Returns in HarrowMaking Tax Digital questions from Harrow taxpayers
When does Making Tax Digital for Income Tax apply to me?
MTD ITSA is mandatory from April 2026 for self-employed individuals and landlords with qualifying income above £50,000, and from April 2027 for those with qualifying income above £30,000. Qualifying income is your gross self-employment and property income combined — before expenses.
What is qualifying income for MTD ITSA?
Qualifying income is the combined gross income from self-employment and property, before any expenses are deducted. Employment income, dividends, savings interest, pension income, and capital gains do not count towards qualifying income.
What does MTD ITSA actually require me to do?
You must keep digital records using HMRC-approved software, submit quarterly summaries of income and expenses to HMRC, submit an End of Period Statement after the tax year, and submit a Final Declaration by 31 January (replacing the current Self Assessment return).
Can my accountant submit MTD updates on my behalf?
Yes. An HMRC-registered agent can submit quarterly updates, End of Period Statements, and the Final Declaration on your behalf using their own MTD-compatible software.
What approved software works for MTD ITSA?
The main options are QuickBooks, Xero, Sage, FreeAgent, and Coconut. Your accountant will advise on the most appropriate option for your business type and complexity.
This guide reflects HMRC's MTD ITSA regulations and guidance as of April 2026. Key references: HMRC MTD ITSA guidance, HMRC MTD ITSA steps to take. Mandation dates and thresholds are subject to legislative change — verify current status before acting.
Our editorial team includes ACCA-qualified accountants with experience in MTD implementation, digital record-keeping, and self-employment compliance. All guides are reviewed against current HMRC guidance.