Sole Trader Tax Calculator

Use this sole trader tax calculator to estimate your self-assessment tax liability, including your payment on account.

How to Use the Sole Trader Tax Calculator

Enter your self-employment business profits (that’s your income less allowable business expenses) into the calculator below, press the button for an estimate of the tax you’ll owe.

Sole Trader Tax Calculator

This calculator is for the tax year 2020/2021

Enter your business profits


Total Tax & NI

Income Tax £0.00
Class 2 National Insurance  £0.00
Class 4 National Insurance  £0.00
Payment on Account £0.00

This calculator is for the tax year 2020/2021 and is for estimation purposes only. Actual results may differ. The payment on account is an additional amount you may need to pay, on top of your total tax and NI liability. Everyone’s situation is unique and different so always contact a professional for help with your own situation.

New Here? Learn how to set up the financial side of your business with these easy to understand guides and resources:

  • Sole Trader or Limited Company? – Download my free calculator to check which business structure would help you to pay less tax;
  • Tax Records and Bookkeeping – Understand what tax records you’ll need to keep and how to set up your own bookkeeping system;
  • How to Fill In Your Tax Return Online – In this step-by-step guide, you’ll find everything you need to know to fill in your tax return online and beat the HMRC deadline.
  • Self Employment Taxes Explained – Learn what taxes you’ll pay, how much and when;
  • VAT Guides – From registration to de-registration, VAT schemes and thresholds, these guides will take you through the basics every UK small business owner needs to know;
  • Invoice Template – Free template and step-by-step guide so you can get paid by your clients.

About Anita Forrest

Anita Forrest is a Chartered Accountant, spreadsheet geek and money nerd helping financial DIY-ers organise their money so they can hit their goals quicker.