Accounting
The Most Common Landlord Accounting Mistakes
The mistakes that cost UK landlords thousands — and how to avoid them.
The Landvale Team·Updated 1 July 2026·6 min read
Key takeaways
Mixing personal and property bank accounts is the number-one mistake.
Missing capital-vs-revenue is the most expensive one.
Not claiming allowable expenses quietly overpays tax every year.
Losing receipts fails HMRC audits.
Ignoring Section 24 is the biggest strategic mistake.
The five most costly mistakes
•Mixing personal and property bank accounts — reconciliation nightmare.
•Miscategorising capital vs revenue — either overpays tax now or loses CGT relief later.
•Not claiming mileage, home office and subscriptions — quietly overpays every year.
•Losing receipts — fails HMRC's six-year evidence rule.
•Ignoring Section 24 — turns cash-positive properties into taxable losses.
Landvale's guardrails
Every mistake above triggers a Landvale warning: unmatched receipts, missed categorisations, ambiguous capital-vs-revenue items, and Section 24 impact modelling on every mortgage upload.
Pillar guide
The Complete Guide to Landlord Accounting
→
Frequently asked questions
Miscategorising a major refurb as capital instead of revenue (or vice versa) can cost thousands.
