Self Assessment
Quick answer
HMRC’s system for reporting untaxed income, including rental profit, and paying the tax due. Most landlords must register for Self Assessment and file a return by 31 January after the tax year, paying any tax by the same date. Making Tax Digital is progressively replacing the single annual return with digital quarterly updates for landlords above the income thresholds.
At a glance
- Deadline
- 31 January (online) after the tax year
- Register by
- 5 October after your first year of letting
Full guide
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Open full guideWhy Self Assessment matters for landlords
A new landlord must register for Self Assessment by 5 October following the tax year they started letting — miss it and penalties follow even if little tax is due. The 31 January deadline covers both filing and payment, and larger bills also trigger payments on account. As MTD for Income Tax rolls out, the record-keeping burden shifts from a once-a-year scramble to ongoing digital bookkeeping, which is exactly the gap purpose-built landlord software is designed to close.
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Official sources
LetCompliance editorial reviews this entry every quarter against the sources above. Always confirm specific duties with a qualified solicitor or your local council.
Related terms
SA105 (Property Pages)
The UK Property supplementary pages of the Self Assessment tax return, where landlords report rental income and expenses. It sits alongside the main SA100 return. Under Making Tax Digital for Income Tax, landlords over the income threshold move from the annual SA105 to digital quarterly updates plus a final declaration.
MTD ITSA (Making Tax Digital for Income Tax)
HMRC’s digital tax regime for landlords and the self-employed. From 6 April 2026 anyone whose qualifying gross property plus self-employment income tops £50,000 must keep digital records and file four quarterly updates plus a Final Declaration through HMRC-recognised software, instead of one annual Self Assessment. The threshold drops to £30,000 from April 2027 and £20,000 from April 2028, pulling in most UK landlords.
Section 21 Prerequisites
The bundle of pre-conditions a private landlord in England had to satisfy before a Section 21 notice (Form 6A) was valid: deposit protected within 30 days plus Prescribed Information served, current Gas Safety Certificate served, current EICR served, and current GOV.UK How to Rent guide served on the tenant. Section 21 was abolished on 1 May 2026, and these prerequisites went with it. They do not carry over to Section 8. Of the five, only the deposit rules bar a Section 8 possession order (every ground except 7A and 14, and returning the deposit cures the bar). Gas, EICR and How to Rent never gated Section 8, and the How to Rent guide has itself been withdrawn.
Section 47 Notice (Rent Demand Address)
Section 47 of the Landlord and Tenant Act 1987 requires a landlord’s name and address (or that of an agent in England and Wales) to appear on every rent demand for a residential property. If the demand omits this, no rent is legally due until a Section 48 notice (or compliant rent demand) is served. Routinely missed by individual landlords self-managing without a template; the breach blocks rent recovery and pauses any Section 8 ground 8/10/11 arrears clock until cured.
Bailiff (County Court Bailiff / High Court Enforcement Officer)
The court officer who enforces a possession order at the eviction stage. After a landlord wins a possession order under Section 8 (post-1 May 2026 the only route in England), if the tenant does not leave by the date in the order the landlord applies for a Warrant of Possession (CCB) or a Writ of Possession (HCEO). The bailiff or HCEO then attends to take physical possession; only they may lawfully evict, self-help eviction by the landlord is a criminal offence under section 1 of the Protection from Eviction Act 1977.
Banning Order
A court order under Part 2 of the Housing and Planning Act 2016 banning a person convicted of certain housing offences from letting property, engaging in lettings agency work or holding an HMO licence. Triggered by a banning-order offence (Schedule 1 of the Act): includes serious housing-condition offences, illegal eviction and unlawful HMO operation. A banned landlord is added to the national database of rogue landlords and breach of the order is itself a criminal offence with up to 51 weeks’ imprisonment.