Side Hustle Tax Tracker

Track your side hustle income and expenses all year — and never be surprised by your tax bill again. This UK Self Assessment 2025/26 tracker is designed for anyone with a PAYE job and self-employment income on the side. Log income as you earn it, track expenses with automatic claimable amount calculations, and see your estimated tax bill in real time on the dashboard. At year end, the Tax Summary tab gives you the exact SA103 figures to enter on your HMRC return. Available in Excel and Google Sheets. Built by a qualified accountant.