The shift from one Self-Assessment return per year to five MTD ITSA filings per tax year is the largest operational change to UK landlord tax compliance in a generation. The mechanics: four quarterly updates summarising income and expenses for each three-month period, one End of Period Statement (EOPS) per income source crystallising the year's figures with adjustments, and one Final Declaration replacing the old annual return with the personal tax calculation across all income sources.
This piece walks each filing, the data required, the deadline, and the operational changes a typical UK landlord needs to make in the next six months to be ready. Sister pieces in [the MTD ITSA hub](/guides/mtd-itsa-landlord-2026-guide/) cover [the £50k threshold test](/blog/mtd-itsa-50k-threshold-action/) and [the joint-ownership rules](/blog/mtd-joint-ownership-spouses/).
The five filings per tax year
| Filing | Covers | Deadline | Content |
|---|---|---|---|
| Q1 update | 6 Apr to 5 Jul | 7 Aug | Income and expenses summary |
| Q2 update | 6 Jul to 5 Oct | 7 Nov | Income and expenses summary |
| Q3 update | 6 Oct to 5 Jan | 7 Feb | Income and expenses summary |
| Q4 update | 6 Jan to 5 Apr | 7 May | Income and expenses summary |
| End of Period Statement | Full tax year per income source | 31 Jan following | Adjustments, accruals, prior-year corrections |
| Final Declaration | Personal tax across all sources | 31 Jan following | Replaces Self-Assessment SA100 |
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HMO landlords face accounting work that ordinary buy-to-let landlords don't: mandatory and additional licensing fees treated correctly, room-level rental income that needs tracking per tenant for council tax / utilities apportionment, fire-safety capital expenditure that has to be split between revenue (reactive maintenance) and capital (improvements), and Section 24 finance-cost relief calculations that interact with HMO-specific banking arrangements. Generalist accountants miss several of these every year. We match you with HMO specialists.
What goes in a quarterly update
A quarterly update is a totals submission, not a full transaction-level filing. HMRC requires totals for income and the broad expense categories (repairs, insurance, agent fees, finance costs, allowable management, other) per property business. The underlying transactions must be in MTD-compatible software with the digital links from source data preserved, but the API submission to HMRC carries totals only.
Quarterly updates are not the taxpayer's tax position. They do not generate a tax liability. They are operational data points that allow HMRC and the taxpayer to monitor cumulative income through the year. Tax is only crystallised at the Final Declaration in January following the tax year end.
The End of Period Statement
The EOPS is the year-end true-up per income source. For a landlord, that means one EOPS for UK property income, a separate EOPS for foreign property income if applicable, and a separate EOPS for any self-employment. The EOPS includes accruals, prior-year adjustments, opening and closing inventory adjustments (for sole traders), and any one-off items not captured in the quarterlies. It is the source-specific equivalent of the old supplementary pages on a Self-Assessment return.
The Final Declaration
The Final Declaration consolidates EOPS data across all sources, layers in non-MTD income (dividends, PAYE, savings interest, capital gains), and produces the personal tax calculation. It is filed by 31 January following the tax year end, the same deadline as the old SA100. The Final Declaration is the legally binding tax return; HMRC raises any assessments against it. The quarterly updates and EOPS are operational filings underneath it.
Penalty points and missed deadlines
MTD ITSA introduces a points-based penalty regime separate from the existing late-filing penalties. Each missed filing earns one point. Four points across a 12-month rolling period (the threshold for quarterly filers) triggers a £200 fixed penalty. Each subsequent missed filing while at the threshold earns another £200 penalty. Late payment interest applies to any tax owed at the Final Declaration if not paid by 31 January.
Operational changes a landlord needs to make
- Move all property bookkeeping into MTD-compatible software with bank feed integration.
- Open a dedicated property bank account if currently mixing personal and rental income.
- Set up agent or app integration for the quarterly API submissions.
- Reconcile the closing position at 5 April 2026 to give a clean opening for Q1.
- Establish a quarterly close routine: bank feeds reconciled within 14 days of period end, expenses captured, totals submitted.
- Diary the four quarterly deadlines and the EOPS / Final Declaration dates.
Do I have to use software, or can I keep spreadsheets?
Spreadsheets are not banned, but they must connect to bridging software that submits the quarterly update via the HMRC API. Pure spreadsheet workflows with manual data entry into HMRC's online portal are not MTD-compliant. In practice, the digital-link requirement makes spreadsheets-plus-bridging materially more error-prone than dedicated landlord software like Hammock, FreeAgent, or Xero for a single-property landlord. Spreadsheet-plus-bridging remains workable for very high-volume landlords with bespoke ERP systems.
What happens if I cross the threshold mid-tax-year?
You do not enter MTD mid-tax-year. The threshold test is done once a year against the last filed Self-Assessment return. A landlord who crosses £50k of gross income for the first time in 2026-27 will be assessed via the 2026-27 return filed in January 2028, and enters MTD from 6 April 2028.
Can my accountant submit on my behalf?
Yes. An [MTD-authorised accountant](/services/mtd-compliance/) can submit quarterly updates, EOPS, and the Final Declaration on the taxpayer's behalf, using the new MTD agent authorisation (not the legacy 64-8). Most landlords inside MTD use an agent because the quarterly cadence and digital-link discipline are operationally heavier than the old annual return. The agent fee differential between Self-Assessment and MTD ITSA is typically £300 to £600 per year for a small landlord.