Sole Trader Tax Companion

Know exactly what you owe — income tax, National Insurance, student loan and payments on account — all in one simple tool.

What it does

✅ Estimates your income tax for 2026/27 — including the personal allowance taper over £100,000
✅ Works out your Class 4 and Class 2 National Insurance correctly
✅ Calculates student loan repayments for all plans (1, 2, 4, 5 and Postgraduate)
✅ Shows your payments on account so the January bill is never a shock
✅ Updated every year to the latest HMRC rates

Simple to use

Just enter your income and expenses in the yellow boxes and choose your student loan plan. Everything else calculates automatically. Works in Google Sheets on any device, or in Excel — your choice. The calculations behind it stay locked so nothing breaks.

£29

Instant access — Google Sheets or Excel

Built by an accountant

Created by Mel Dean FCCA, with over 20 years of experience helping UK business owners. Every rate is checked against the latest HMRC figures for 2026/27.

This is an estimation tool, not a substitute for professional advice or your Self Assessment return. It does not calculate the High Income Child Benefit Charge or account for other income sources.