Making Tax Digital for Income Tax (MTD ITSA): The 2026 Landlord Guide

Making Tax Digital for Income Tax Self Assessment (MTD ITSA) is the single largest change to UK landlord tax compliance in a generation. From 6 April 2026, landlords with qualifying property and self-employment income above £50,000 must keep digital records, submit quarterly updates to HMRC, and replace their annual Self-Assessment return with a Final Declaration. The threshold drops to £30,000 from April 2027 and is expected to fall to £20,000 from April 2028.

For most landlords this is not optional and not a soft launch. HMRC has confirmed the April 2026 trigger, the software vendor list is published, and the penalty-points regime is already drafted. Landlords still relying on spreadsheets, paper receipts or end-of-year shoebox submissions need to migrate to MTD-compatible software before the first quarter ends.

Who is in scope from April 2026

You are within MTD ITSA from 6 April 2026 if all of the following apply:

• You are a UK-resident sole trader, landlord or self-employed individual.
• Your combined gross qualifying income from self-employment and property in the 2024-25 tax year exceeded £50,000.
• You file Self-Assessment.
• You are not specifically excluded (some trustees, certain non-resident landlords with PAYE-only UK income, and recipients of an MTD digital-exclusion exemption).

HMRC tests qualifying income against the most recent Self-Assessment data on file. A landlord whose 2024-25 income exceeded £50,000 receives an HMRC letter in late 2025 confirming MTD entry from April 2026, regardless of whether 2025-26 income falls below the threshold.

How quarterly submissions actually work

MTD ITSA replaces the single annual return with five filings per tax year:

1. 1Q1 update: covers 6 April to 5 July, due 7 August.
2. 2Q2 update: covers 6 July to 5 October, due 7 November.
3. 3Q3 update: covers 6 October to 5 January, due 7 February.
4. 4Q4 update: covers 6 January to 5 April, due 7 May.
5. 5Final Declaration: replaces the Self-Assessment return, due 31 January following the tax year (same deadline as today).

Each quarterly update is a cumulative, year-to-date summary of property income and expenses, broken down by category (rent received, repairs, mortgage interest, agent fees, etc.). HMRC uses the data to provide an in-year tax estimate. The estimate is not a binding tax demand and no payment is due until 31 January following the tax year.

Joint ownership and the spousal split

Jointly owned property is one of the most misunderstood corners of MTD ITSA. The rules are:

• Each owner tests the £50,000 threshold individually against their share of qualifying income.
• A spouse-and-spouse pair owning property jointly defaults to a 50/50 income split for tax purposes (regardless of legal title) unless a Form 17 declaration of unequal beneficial ownership is filed.
• Each spouse files their own MTD quarterly updates if individually above the threshold.
• Couples can find one spouse inside MTD and the other outside in the same tax year.

For couples close to the threshold, a Form 17 declaration to shift income onto the lower-earning spouse can keep one spouse below £50,000 and outside MTD ITSA for an extra year. The declaration must reflect actual unequal beneficial ownership and is not retrospective.

Choosing MTD-compatible software

HMRC publishes a recognised vendor list. The realistic options for landlords sit in three tiers:

For most Harrow landlords the property-specific tier is the right starting point: it categorises income by tenant, tracks rent arrears, supports HMO room-letting, and submits the MTD quarterly update directly. Xero and FreeAgent are stronger when the landlord also has self-employed income or runs an SPV alongside personally-held property.

The MTD penalty-points regime

Late quarterly updates and late Final Declarations attract penalty points under the new points-based system:

• One point per missed quarterly update, capped at four points within a 24-month rolling window before a £200 financial penalty triggers.
• A separate points balance applies to VAT, ITSA and corporation tax; landlords with property and self-employment carry one combined ITSA balance.
• Points expire after 24 months of full compliance.
• Late payment penalties remain a separate calculation: 3% of unpaid tax at 30 days, a further 3% at 60 days, then 10% annualised.

The Final Declaration replaces Self-Assessment

The Final Declaration is the new annual reconciliation. It pulls together the four quarterly updates, applies year-end adjustments (capital allowances, finance costs restriction, replacement of domestic items relief, mortgage interest tax credit), and confirms the binding tax liability. Crucially:

• The 31 January payment deadline is unchanged.
• Payments on account remain in force on the same January and July schedule.
• The Final Declaration has the same legal status as the old SA100 return, signed and submitted under penalty of false declaration.
• If you have other income (employment, dividends, foreign income) that you previously reported on Self-Assessment, that data still flows through the Final Declaration; MTD ITSA does not remove non-business income from the picture.

Exemptions and digital-exclusion process

A small population of landlords can apply for exemption from MTD ITSA on the grounds of digital exclusion. The criteria are tight:

• Age, disability or remoteness that makes digital filing impractical.
• A genuine objection on religious grounds (a small minority).
• Bankruptcy or formal insolvency proceedings during the relevant year.

Mere preference for paper filing or unfamiliarity with software is not grounds for exemption. Applications go via HMRC and a written decision follows. Until exemption is granted, the landlord remains within MTD and must file quarterly updates.

A 12-week prep schedule for Harrow landlords

For landlords above £50,000 who have not yet started, a structured 12-week run-in to April 2026:

1. 1Weeks 1-2: confirm threshold status, gather 2024-25 Self-Assessment data, model whether a Form 17 split would help.
2. 2Weeks 3-4: pick software, set up the chart of accounts, import bank feeds for the rent and expense accounts.
3. 3Weeks 5-6: load the prior 6 months of transactions, categorise to MTD format, reconcile to bank.
4. 4Weeks 7-8: agree the quarterly review rhythm with your accountant, automate receipt capture, set HMRC authentication.
5. 5Weeks 9-10: dry-run a quarterly submission, fix categorisation issues, brief tenants on any change to bank account references.
6. 6Weeks 11-12: sign off opening balances, set calendar reminders for the four quarterly deadlines, confirm Final Declaration sign-off process.