Sole Trader & Landlord Expenses Tracker 2026/27 (Excel / Google Sheets)

Keep your 2026/27 books in one spreadsheet and have the Self Assessment figures ready in January.

• Income, Expenses and Mileage tabs: pick the tax-return category from a drop-down, set business-use %, and the allowable amount is worked out for you.
• - Mileage at HMRC approved rates (45p first 10,000 miles, 25p after).
• - Summary tab: profit for the year, every SA103 / SA105 box totalled, and an estimate of income tax + Class 4 NI at 2026/27 rates (personal allowance £12,570, Class 4 6% / 2%). Shows whether payments on account will apply.
• - Landlord mode: property categories and the mortgage-interest reminder (20% tax credit, box 44).
• - Works in Excel, Google Sheets and LibreOffice. No macros. One-off purchase, yours to keep.

Made by the people behind the free Plain Tax calculators (plaintax.co.uk). Not tax advice.