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Self-Employed Tax Calculator

Free Employed & Self-Employed Tax Calculator Tool

Use our smart employed and self-employed tax calculator to quickly estimate your tax liability with accuracy and ease. Simply enter your income details to get instant results, helping you plan finances better, avoid surprises, and stay fully prepared for your tax obligations throughout the year with confidence.

6 April 2026 – 5 April 2027
Tax Year
1. Your situation
£
£
For example: rental income, savings interest or other taxable income not taxed via PAYE.
£
£
Self-Assessment breakdown
All income
Yearly
Monthly
Weekly
Daily
Income after expenses
£0
£0
£0
£0
Total tax
£0
£0
£0
£0
Class 4 NICs
£0
£0
£0
£0
Take home pay
£0
£0
£0
£0
2. Tax and profit
Total earnings £70,000
£0 Income Tax already collected through PAYE on your salary £0 employee National Insurance already collected through PAYE on your salary £0 expenses (we’ve also used the £1,000 trading allowance for tax).
Tax to pay (Self Assessment) £10,117
£9,146 Income Tax to settle via Self Assessment £971 Class 4 National Insurance
What you’re left with £50,203

Calculation details

Estimate Your Tax Bill Before It Catches You Off Guard

Being your own boss offers freedom, but you’re also in charge of your taxes. This tool estimates your Income Tax and National Insurance contributions based on your income and what you can claim as expenses each year. It shows your possible tax bill, so you can budget and avoid owing more than you expected when tax season rolls around.

What This Calculator Does

This tool gives you a quick estimate of your:
Taxable profit
Income Tax
Class 4 National Insurance
Total amount you should expect to pay
This is a tax tool made for independent workers who want to easily figure out their tax obligations for the year.

How To Use It

Enter the following details into the calculator:

1. Your total earnings: Add up all income from your self-employed work.
2.Your business expenses: Include your allowable costs, such as equipment, materials, travel, utilities, phone bills, or anything else you use purely for work.
3.The calculator will display your estimated taxable profit as well as the amount of tax and NI owed after you enter the numbers.

How Your Tax Is Calculated

Your profits (income less expenses) determine your tax liability.

The calculator breaks it down as follows:

Taxable Profit: HMRC uses this amount to figure out your tax. The higher your profit, the higher the tax band you fall into.
Income Tax: Calculated using the standard UK tax bands for the current tax year. Based on your profit, the calculator determines the appropriate threshold.
Class 4 National Insurance: If your earnings exceed the lower profit threshold, you are required to pay Class 4 NI. Once your profit exceeds the upper threshold, the rate goes up.

Why It Helps

A lot of independent contractors don’t give their tax bill much thought until the last minute. With this calculator, you can plan ahead. You can set aside the appropriate amount each month and prevent unforeseen bills later on by checking your numbers early.
It’s also useful if you’re considering increasing your rates, taking on new tasks, or making cost reductions. A clear understanding of your tax liability makes financial planning easier.
Tools like VAT Calculator are therefore crucial for maintaining accurate records and tax returns.

Important Information

The UK tax year runs from 6 April to 5 April. Your tax return and payment are normally due by 31 January.

Your estimate is a useful starting point, but getting your Self Assessment right matters. If you would like us to prepare and file your tax return, our team can help. Find out more about our Self Assessment services.

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Is Artifin authorised and regulated accountants in London, UK?

Yes, Our team of qualified London Accountants has qualifications from top accountancy bodies, such as CIMA ( Chartered Institute of Management Accountants), ACCA ( Association of Chartered Certified Accountants) & AAT ( Association of Accounting Technicians). In addition, we are on ICMA approved employer’s list.

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