Self Assessment Is Not Just A January Job: What London Landlords And Directors Should Fix This Autumn
Self Assessment preparation should begin in autumn, not in the final weeks before the January deadline. For London landlords and company directors, the useful work now is to confirm whether a return is required, bring records up to date, separate personal and business information, and identify anything missing while there is still time to correct it.
For the 2025 to 2026 tax year, HMRC’s online Self Assessment filing and payment deadline is 31 January 2027. Starting earlier gives you time to reconcile rental income, expenses, dividends and other relevant income, while planning cash for any tax that may become due.
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Why Autumn Self Assessment Preparation Beats A January Rush
January pressure is often caused by incomplete information rather than the tax return itself. Missing invoices, unclear bank transactions, forgotten property costs or records spread across several systems can slow preparation and make the figures harder to understand.
An autumn review creates a cleaner starting point and gives business owners more time to see how personal tax obligations sit alongside company cash flow, VAT, payroll and Corporation Tax commitments.
Besnik Vata, Director of BES Accountancy, explains:
“Preparing earlier gives you time to correct the records, understand what information is still needed and plan for the payment rather than simply react to the deadline.”
Landlords Should Reconcile Property Records Now
Landlords preparing for Self Assessment should make sure rental records are complete and organised. HMRC says records may include dates a property was let, rent received, income from services provided to tenants, receipts, invoices, bank statements and allowable expenses.
A practical autumn review should check:
Rental income received during the relevant period
Letting agent statements where applicable
Invoices and receipts for property related costs
Bank statements supporting income and expenditure
Any gaps where figures still need supporting documents
Do not assume every property related payment is deductible. Tax treatment can differ, so expenses should be categorised correctly and reviewed according to the landlord’s circumstances.
Directors Need To Separate Company And Personal Records
Being a company director does not automatically mean Self Assessment is required simply because of the directorship. HMRC lists circumstances that can require a return, including certain untaxed income such as property income, dividends and other investment income, as well as situations where HMRC has asked for a return.
The company and the individual have separate tax responsibilities. Corporation Tax belongs to the company, while a director’s Self Assessment deals with the individual’s personal tax position where a return is required.
Directors should check that salary information, dividends and other relevant personal income can be reconciled with company records. Clean bookkeeping and accurate accounts can make this process clearer.
Check Registration And Filing Dates Before They Become Urgent
If you need to complete a return for the 2025 to 2026 tax year and have not sent one before, or were previously registered but did not need to send a return for 2024 to 2025, HMRC says you must tell them by 5 October 2026. The online filing and payment deadline is 31 January 2027.
If you are unsure whether you need to file, use HMRC’s official checker rather than assuming every landlord or director has the same requirement. Circumstances differ, and HMRC may also ask an individual to submit a return.
Use Digital Records To Reduce Year End Corrections
Good bookkeeping can reduce Self Assessment pressure. Instead of searching through emails, paper receipts and several bank accounts in January, transactions can be recorded and reconciled throughout the year.
BES Accountancy has expertise in Xero and QuickBooks, supporting more structured digital record keeping. This is increasingly relevant for landlords because Making Tax Digital for Income Tax is being introduced in stages for qualifying sole traders and landlords, with compatible software and digital records required for those in scope.
Better digital records can also improve cash flow visibility and make it easier to prepare accurate information for an accountant or other professional adviser.
Plan For The Tax Payment, Not Just The Return
Filing early does not mean tax has to be paid immediately, but knowing the likely position earlier can improve cash planning. A landlord may need to balance tax with property expenditure. A director may need to consider personal tax alongside company payroll, VAT and Corporation Tax commitments.
The important point is to avoid reaching January with the return prepared but little visibility over the cash required. Earlier preparation gives you more time to understand expected commitments and seek advice where the tax treatment of income or expenditure is unclear.
Final Thoughts
Self Assessment preparation works best when it becomes part of normal financial management rather than a January emergency. Landlords need organised rental income and expense records. Directors need company and personal information kept clearly separate, together with confirmation of whether a return is actually required.
BES Accountancy, a London based accounting company founded in 2020, supports businesses and self employed professionals throughout the UK. Led by Besnik Vata, a certified bookkeeper with an AAT licence, and supported by a team of five specialists, the firm provides practical accounting support focused on availability, efficiency and trust.
For further practical guidance, read more accounting advice and blogs.
Frequently Asked Questions
When Is The Self Assessment Deadline For The 2025 To 2026 Tax Year?
For most people filing online, the deadline to submit the 2025 to 2026 Self Assessment return and pay the tax due is 31 January 2027.
Do Company Directors Always Need To File A Self Assessment Return?
No. Directorship alone does not automatically require a return. A director may still need to file because of untaxed income, property income, dividends, other relevant circumstances or because HMRC has asked for a return.
What Records Should Landlords Prepare For Self Assessment?
Landlords should organise records supporting rental income and relevant costs, including rent records, receipts, invoices, bank statements and other supporting documents. The correct tax treatment of individual expenses depends on the circumstances.
Can Xero Or QuickBooks Help With Self Assessment Preparation?
Yes. Well maintained digital bookkeeping can make income, expenses and supporting records easier to reconcile before a return is prepared. Software does not replace the need for accurate records or advice where tax treatment is uncertain.
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