Can You Be a Sole Trader and Employed at the Same Time?

Many people in the UK run their own business alongside a regular job, and the good news is that this is entirely legal. Whether you are freelancing in the evenings, selling products online at weekends, or building a side business while you hold down a full-time role, you can be a sole trader and an employee simultaneously. However, there are tax obligations, reporting requirements, and practical considerations you need to understand before you get started.

This guide explains how the arrangement works, what HMRC expects from you, and how to keep everything above board.

What Does It Mean to Be a Sole Trader?

A sole trader is the simplest form of self-employment in the UK. You are running a business as an individual, and you are personally responsible for any debts or liabilities that business incurs. There is no legal separation between you and the business, unlike a limited company.

Being a sole trader does not mean you work alone or that your business is small. It simply refers to your legal and tax structure. You report your self-employed income and expenses to HMRC through a Self Assessment tax return each year, and you pay Income Tax and National Insurance on your profits.

Is It Legal to Be Employed and Self-Employed at the Same Time?

Yes. HMRC allows individuals to be both employed and self-employed at the same time. There is no rule that prevents you from having a salaried job with one employer while also running your own sole trader business on the side. Millions of people in the UK do exactly this.

That said, there is one important caveat: your employment contract. Some employers include clauses that restrict employees from undertaking outside work, particularly if it competes with the employer’s business or creates a conflict of interest. Before starting any self-employed activity, check your employment contract carefully. If in doubt, speak to your employer or seek legal advice.

The Trading Allowance: A Useful Starting Point

If your sole trader income is relatively modest, the trading allowance may be relevant. This is a tax-free allowance of £1,000 per tax year that applies to self-employment and casual income. If your gross self-employed income does not exceed £1,000 in a tax year, you do not need to register for Self Assessment or pay any tax on that income.

If your gross income exceeds £1,000, you can still use the allowance to deduct £1,000 from your taxable income instead of claiming your actual business expenses. However, you cannot claim both the trading allowance and your business expenses in the same tax year. If your allowable expenses add up to more than £1,000, it will usually be more beneficial to claim those instead.

The trading allowance applies even if you are already employed and paying tax through PAYE. It is an individual allowance, and having employment income does not affect your entitlement to it. You can find further details on GOV.UK.

How Tax Works When You Are Both Employed and Self-Employed

When you are employed, your employer deducts Income Tax and National Insurance from your wages through the PAYE (Pay As You Earn) system. This happens automatically, and you receive a payslip reflecting the deductions.

When you are also self-employed, you must register with HMRC and complete a Self Assessment tax return each year. Your sole trader profits are added to your total income for the tax year, and HMRC calculates the total tax due across both income streams.

Your Personal Allowance

Every individual in the UK receives a Personal Allowance, which is the amount of income you can earn before you pay any Income Tax. For the 2026/27 tax year, this remains at £12,570. Your Personal Allowance is typically applied through your PAYE employment first. This means that by the time HMRC calculates the tax on your sole trader profits, you may already have used all or most of your allowance against your employed income.

In practical terms, this means even modest self-employed profits could be taxable. It is important to set money aside for your tax bill from the outset.

National Insurance Contributions

As an employee, you pay Class 1 National Insurance on your earnings above the Primary Threshold through PAYE. As a sole trader, you pay Class 4 National Insurance on your profits, calculated through Self Assessment. For 2025/26, Class 4 is charged at 6% on profits between £12,570 and £50,270, and 2% on profits above £50,270.

Mandatory Class 2 National Insurance was abolished from April 2024. If your profits exceed the Small Profits Threshold (£6,845 for 2025/26), you will automatically be treated as having a qualifying year for State Pension purposes without needing to make any separate payment. If your profits fall below that threshold, you can choose to pay voluntary contributions at a flat weekly rate to protect your National Insurance record.

Paying National Insurance through your employer does not reduce or remove your Class 4 self-employed National Insurance liability. HMRC will, however, consider your total contributions across all income sources and apply a cap where necessary to avoid excessive payments.

Registering as a Sole Trader

If your self-employed income exceeds £1,000 in a tax year, you must register as self-employed with HMRC. The deadline is 5 October following the end of the tax year in which you started trading. For example, if you began trading during the 2026/27 tax year (which ends 5 April 2027), you must register by 5 October 2027.

You can register online via GOV.UK. Once registered, you will need to complete a Self Assessment tax return each year. Failure to register on time can result in a penalty from HMRC, so do not delay.

Self Assessment: What You Need to Report

Your Self Assessment tax return covers the full tax year from 6 April to 5 April. You must report:

• Your total self-employed income (turnover) from your sole trader business
• All allowable business expenses, which are deducted to arrive at your taxable profit
• Any employed income you received during the year (this is often pre-populated from HMRC’s records, but you should verify it)
• Any other income such as rental income, dividends, or savings interest

The deadline for filing your online Self Assessment return is 31 January following the end of the tax year. For the 2025/26 tax year, this means you must file by 31 January 2027. Any tax owed for that year is also due by the same date.

You can find full guidance on Self Assessment on GOV.UK.