The best free way to calculate your taxes

Before drowning yourself in a sea of sums and numbers, we would like to ask you one question. Do you know the difference between a 345L or a 456P? If your answer was no, it’s OK.…

5 Minute Read

Last Updated: 9th February 2022

Before drowning yourself in a sea of sums and numbers, we would like to ask you one question. Do you know the difference between a 345L or a 456P?

If your answer was no, it’s OK. Most of us aren’t that knowledgable about tax codes and millions of people regularly miscalculate their taxes, waving goodbye to their hard-earned money and saying hello to massive over-payments.

Tax calculations are confusing to the best of us. Einstein famously said:

“The hardest thing in the world to understand is the income tax.

If Einstein needed help with his taxes, what chance have ordinary folk got?

Don’t worry, our specialist software can make sense of all that mathsy jargon and figures out your tax liability instantly. Simply sign in, add your income and expense details and our software will do the hard work for you. Also, we’ll provide you with top tax saving tips so you can save even more money.

Why sign up now?

  • Get your tax liability instantly.
  • Safe & Secure – protected by 256-bit secure connections.
  • Nothing to install: runs on everything!
  • Save yourself hundreds of pounds.

Sign up today  and calculate your taxes like a professional, for FREE.


Access SimpleTax and discover a new free way of filing your return (HMRC approved), know what expenses will help you lower your tax bill and keep all your records online, safe & sound. Ready to file with one click! Free means free. No hidden costs.

View our Guide to Self Assessment Tax Returns

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Blog content is for information purposes and over time may become outdated, although we do strive to keep it current. It's written to help you understand your Tax's and is not to be relied upon as professional accounting, tax and legal advice due to differences in everyone's circumstances. For additional help please contact our support team or HMRC.

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How GoSimpleTax Works


Simply register for free with your full name and email address.

Select Your Income

Select the income you receive and follow the hints and tips for potential tax savings.

Validate Your Information

Validate your personal information and submit directly to HMRC to get confirmation in just seconds.


Work Anywhere, With Any Device

Gone are the days of fretting over a calculator surrounded by scraps of paper at the eleventh hour.

GoSimpleTax’s tax return software uses the information you upload in real time to calculate your income and expenditure, working out the tax you owe and sending you helpful notifications when there’s the possibility of a mistake.

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Ordained Presbyter

"Easy to use and value for money. Everything you need to do your tax."

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Self Employed

"It fills in all the forms and sends them to the Inland Revenue. Not expensive either. Takes the stress out of doing your tax return online."

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Team Rector

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