Use our UK sole trader tax calculator to estimate 2026/27 Income Tax, National Insurance and student loan repayments for Self Assessment. to plan your tax.
UK Sole Trader Tax Calculator: 2026/27 Tax Guide UK Tax
October 21, 2026
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UK Sole Trader Tax Calculator: How Much Tax Will You Pay in 2026/27?
Running a business as a sole trader gives you control over how you work, but it also means keeping track of your own tax obligations. Unlike an employee whose Income Tax is generally collected through PAYE, a sole trader usually needs to calculate their taxable profit and report it through Self Assessment.
The amount you owe is not simply based on your business turnover. Your allowable expenses, other income, Personal Allowance, National Insurance position, student loan repayments and other deductions can all affect the final figure.
The Aksons Accounting UK Sole Trader Tax Calculator helps you estimate your Income Tax, self-employed National Insurance and relevant student loan repayments for the tax year. It can also help you understand how the calculation is built up and how much you may need to set aside for Self Assessment.
Calculate Your Sole Trader Tax
Want to see what your potential tax bill could look like for 2026/27?
Use the Aksons Accounting UK Sole Trader Tax Calculator to estimate Income Tax, National Insurance and relevant student loan repayments based on your figures.
What Is a Sole Trader Tax Calculator?
A sole trader tax calculator is a planning tool that estimates the tax and related liabilities arising from your self-employed income.
The starting point is your business income. From there, the calculation considers allowable business expenses or the £1,000 trading allowance, depending on which method applies. The resulting business profit is then considered alongside other taxable income and relevant deductions.
For example, two sole traders could each have £50,000 of turnover but arrive at different tax estimates because their allowable expenses and other income are different.
A useful calculator should therefore do more than apply a single percentage to turnover. It should reflect the main factors that can affect a sole trader’s Self Assessment position.
What Taxes Does a UK Sole Trader Pay?
A sole trader may have several different amounts to consider when planning for their tax bill.
Income Tax
Income Tax is generally calculated on taxable income after taking account of available allowances and deductions.
For a sole trader, business profit is an important part of this calculation. However, if you also have employment income, pension income or other taxable income, these can affect how much of your Personal Allowance and tax bands are available.
Your tax position can also differ if you are a Scottish taxpayer because Scottish Income Tax rates and bands apply to most non-savings income.
Self-Employed National Insurance
National Insurance can also form part of a sole trader’s overall liability.
Class 4 National Insurance is linked to self-employed profits. Your position can vary depending on your level of profits and other circumstances.
Class 2 National Insurance has also changed in recent years. Where profits are below the relevant threshold, some sole traders may choose to pay voluntary Class 2 contributions to help protect their State Pension record.
This is why a good sole trader calculator should distinguish between Income Tax and National Insurance rather than combining everything into one estimated percentage.
Student Loan Repayments
If you have a student or postgraduate loan, your Self Assessment calculation may also include repayments.
The amount depends on factors such as your income and the repayment plan or plans you hold. If you have more than one plan, the calculation can become more complicated.
The Aksons Accounting calculator allows relevant student and postgraduate loan information to be included when estimating your overall position.
How Much Tax Will a Sole Trader Pay in 2026/27?
There is no single tax rate that applies to every sole trader.
For the 2026/27 tax year, your estimated liability can depend on:
- Your taxable business profit
- Your Personal Allowance
- Where you live for tax purposes
- Other employment or taxable income
- Allowable business expenses
- Pension contributions and eligible Gift Aid payments
- Student loan repayments
- National Insurance
- Payments on account already made
The distinction between turnover and profit is particularly important.
Suppose a sole trader receives £50,000 in business income but has £10,000 of allowable business expenses. The business profit before considering other adjustments would be £40,000, not £50,000.
That does not mean every sole trader with £40,000 of profit will have exactly the same tax bill. Their wider circumstances still matter.
England, Wales and Northern Ireland vs Scotland
Your location can also affect the calculation.
Scottish Income Tax applies based on where your main home is for tax purposes, rather than simply where you work. Sole traders living in Scotland can therefore have different Income Tax calculations from people with the same taxable income living in England, Wales or Northern Ireland.
This is one reason it is important to select the correct location when using a tax calculator.
Turnover Is Not the Same as Taxable Profit
One of the most common mistakes made by new sole traders is assuming that tax is calculated directly from turnover.
Turnover represents the money generated by the business. Profit is what remains after relevant allowable business expenses have been deducted.
For example:
The actual calculation can be more complicated depending on the accounting method and individual circumstances, but the example demonstrates why turnover alone is not enough to estimate your tax.
Business income can include money received through different payment methods, while amounts such as money you personally put into the business or business loans are not treated as trading income in the same way.
If you are VAT registered, the figures you enter also need to reflect the way the calculator instructs you to report VAT.
| Business figure | Example |
| Sales and other business income | £60,000 |
| Allowable business expenses | £15,000 |
| Business profit | £45,000 |
Actual Expenses or the £1,000 Trading Allowance?
Sole traders may be able to calculate their taxable trading income using either actual allowable expenses or the £1,000 trading allowance, subject to the relevant rules.
You cannot normally claim the £1,000 trading allowance and deduct your actual expenses for the same income.
Actual Allowable Expenses
Using actual expenses can be appropriate where a business has significant allowable costs.
These could include qualifying costs incurred wholly and exclusively for the purposes of the trade, subject to the applicable tax rules.
Examples can include certain business premises costs, professional expenses, business insurance and other qualifying operating costs.
Only the allowable business portion of a cost should be included.
The £1,000 Trading Allowance
The trading allowance can simplify tax calculations for some people with relatively low trading income.
Instead of claiming actual expenses, the allowance may be deducted under the applicable rules.
Whether it produces a better result depends on the individual’s circumstances, so it should not automatically be assumed that one option is always better.
The Aksons Accounting calculator allows you to select the appropriate approach when estimating your position.
Check Your Estimated Tax Liability
Your turnover is only part of the picture. Enter your business income, expenses and other relevant details into the Aksons Accounting tax calculator to see how these factors could affect your estimated Self Assessment liability.
How the Aksons Accounting Sole Trader Tax Calculator Works
The calculator is designed to take you through the main information needed for an estimate.
Step 1: Select Your Tax Year
You can choose the relevant tax year, including 2026/27.
The tax year runs from 6 April to 5 April of the following year.
Using the correct tax year is essential because tax rates, allowances and thresholds can change.
Step 2: Choose Where You Live for Tax Purposes
You can select:
- England
- Wales
- Northern Ireland
- Scotland
This matters because Scottish Income Tax is calculated differently from the Income Tax system used in England, Wales and Northern Ireland.
Step 3: Enter Your Business Income
You can enter your sales or turnover for the tax year.
The calculator also allows for other relevant business income and refunds, returns or credit notes.
If your income changes significantly throughout the year, entering figures month by month can help you build up the annual total.
Step 4: Add Your Business Expenses
You can choose between actual allowable expenses and the £1,000 trading allowance.
If you use actual expenses, the calculator can either accept one total figure or help you work through expenses by category.
Equipment, vehicles and simplified expenses may require particular attention because the tax treatment can depend on the accounting method and applicable rules.
Step 5: Add Other Income and Deductions
The calculator can also take account of relevant information outside your sole trader income.
This can include:
- Employment income
- Pension income
- Other taxable income
- Student or postgraduate loans
- Personal pension contributions
- Gift Aid payments
- Payments on account already made
This matters because your sole trader profit does not necessarily represent your entire tax position.
Step 6: Review the Estimate
Once your information has been entered, the calculator provides an estimate of the relevant Income Tax, National Insurance and student loan amounts.
You can then use the estimate as a planning figure when considering how much money to reserve for Self Assessment.
What Other Income Can Change Your Tax Bill?
A sole trader may also earn money outside their business.
For example, someone could run a business while also receiving a salary through PAYE. Another person may have pension income or other taxable income.
This additional income can affect how much Personal Allowance and how much of the relevant tax bands remain available.
For higher-income individuals, the Personal Allowance can also be reduced once income passes the applicable threshold.
This is why simply searching for a tax percentage based on your business profit may produce a misleading estimate.
How Much Should a Sole Trader Set Aside for Tax?
There is no universal percentage that every sole trader should save.
Your required amount depends on your individual tax position. However, estimating your liability during the year can make Self Assessment easier to plan for.
A calculator can help you understand the potential amount rather than waiting until the return is prepared.
You should also remember that payments on account can affect what you need to pay. If applicable, these are advance payments towards a future Self Assessment bill.
For this reason, the amount requested by HMRC can sometimes be higher than a new sole trader expects when they first receive their Self Assessment bill.
Planning ahead can reduce the risk of an unexpected payment.
Making Tax Digital for Income Tax: What Sole Traders Need to Know
Tax planning is not the only reason sole traders should understand their income figures.
Making Tax Digital (MTD) for Income Tax introduces digital record-keeping and reporting requirements for qualifying individuals.
A key point is that HMRC looks at qualifying income, rather than simply asking how much profit you made.
Qualifying income can include gross income from self-employment and property before expenses.
The relevant timetable is based on qualifying income for particular tax years:
| Qualifying income | Tax year checked | MTD start date |
| £50,000 | 2024/25 | 6 April 2026 |
| £30,000 | 2025/26 | 6 April 2027 |
| £20,000 | 2026/27 | 6 April 2028 |
These figures are used to identify the relevant MTD start dates under the current timetable. Specific exemptions and other rules can apply, so taxpayers should check their circumstances using HMRC’s guidance.
The Aksons Accounting calculator includes a separate MTD check to help users understand whether their income may fall within the relevant timetable.
Common Mistakes When Estimating Sole Trader Tax
Tax estimates can become unreliable when basic information is entered incorrectly.
1. Using Turnover Instead of Profit
Your turnover is not automatically your taxable profit. Allowable expenses and the applicable rules need to be considered.
2. Claiming Both Expenses and the Trading Allowance
The £1,000 trading allowance is an alternative to claiming actual expenses for the relevant trading income. You should not simply add both together.
3. Forgetting Other Income
Employment, pension and other taxable income can affect the overall calculation.
4. Ignoring Student Loan Repayments
If you have a qualifying student or postgraduate loan, repayments can form part of your Self Assessment calculation.
5. Forgetting Payments on Account
Your Self Assessment bill can include payments on account where the rules require them.
6. Assuming Scotland Uses the Same Income Tax Rates
Scottish taxpayers need to use the Scottish Income Tax rules for relevant non-savings income.
7. Treating an Estimate as Your Final Tax Bill
An online calculator is a planning tool. Your actual HMRC liability depends on your complete circumstances and the information submitted on your tax return.
Is an Online Sole Trader Tax Calculator Accurate?
A well-designed calculator can be useful for estimating your potential liability, but it should not be treated as an official HMRC calculation.
The result depends on the information you provide and the scope of the calculator.
For example, the Aksons Accounting calculator does not cover every possible tax circumstance. Its stated exclusions include areas such as savings interest, dividends, capital gains, foreign income, certain loss relief situations, partnerships, Construction Industry Scheme deductions and several other specialist circumstances.
Tax rules can also change.
For these reasons, you should check current GOV.UK guidance and consider speaking to an accountant if your circumstances are complex or you are unsure how a particular rule applies.
Plan Ahead for Your Self Assessment
Don’t wait until your tax return is due to discover what you may need to pay. Use the Aksons Accounting UK Sole Trader Tax Calculator to get an estimate and start planning ahead.
Frequently Asked Questions
- How much tax does a sole trader pay in the UK?
There is no single rate for every sole trader. Your liability depends on taxable profit, allowances, other income, National Insurance and other relevant circumstances.
- Is sole trader tax based on turnover or profit?
Tax is generally based on taxable profit rather than simply turnover. Allowable expenses or the applicable trading allowance can affect the profit used in the calculation.
- Can I use the £1,000 trading allowance?
You may be able to use the trading allowance if the relevant conditions are met. You generally cannot claim it and actual expenses for the same trading income.
- Do sole traders pay National Insurance?
Self-employed National Insurance can apply depending on your profits and circumstances. The rules for Class 4 and voluntary Class 2 contributions should be considered separately.
- How much should I save for my Self Assessment tax bill?
There is no fixed percentage that applies to everyone. Estimating your Income Tax, National Insurance and other relevant liabilities can help you plan how much to reserve.
Conclusion
Understanding your potential tax liability does not have to mean waiting until your Self Assessment deadline.
The Aksons Accounting UK Sole Trader Tax Calculator brings together business income, allowable expenses or the trading allowance, other income, National Insurance, student loan repayments and relevant deductions to provide an estimate for the selected tax year.
It can be particularly useful when you want to understand how changes in your business income or expenses could affect your overall position.
However, remember that the result is an estimate rather than an official HMRC calculation. If you have complex tax affairs or are uncertain about your obligations, professional advice can help you understand your position before submitting your return.
About Aksons Accounting
Aksons Accounting provides accounting and tax support for individuals and businesses in the UK.
The firm aims to make accounting information easier to understand while helping clients manage their financial and tax responsibilities.
Alongside accounting services, Aksons Accounting provides practical online resources and tools, including its UK Sole Trader Tax Calculator and guidance relating to Making Tax Digital.
The calculator is designed as an estimation and planning tool, allowing users to explore how business income, expenses and other relevant factors may affect their tax position.
For specialist or complex circumstances, users should obtain advice based on their individual tax position.
Disclaimer
This article and the Aksons Accounting UK Sole Trader Tax Calculator are provided for general information and estimation purposes only. They do not constitute tax, accounting, financial or legal advice and should not be relied upon as a substitute for professional advice.
Tax calculations depend on your individual circumstances, the information you provide and the tax rules applicable to the relevant tax year. Rates, allowances and thresholds can change, and the calculator may not cover every possible tax situation.
The calculator provides an estimate and is not an official HMRC calculation. Actual tax liabilities may differ from the figures shown.
Before submitting a Self Assessment tax return or making tax payments, you should check the relevant GOV.UK guidance and seek professional advice where appropriate.
Aksons Accounting does not accept responsibility for decisions made solely on the basis of the information provided in this article or through the calculator.
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