Becoming Self-Employed: Registering, Tax and Protection

Working for yourself changes almost every part of your money life at once. There is no employer to deduct tax from your pay, no workplace pension being topped up each month, and no statutory sick pay if you cannot work. Instead, you register with HMRC, keep your own records, work out your profit, pay your own Income Tax and National Insurance, and decide for yourself how to protect your income and save for retirement.

The core rules are straightforward once you know them. You are classed as a sole trader from the moment you start working for yourself, even before you have told HMRC¹. The first £1,000 of self-employment income is covered by the trading allowance, so very small side businesses may owe no tax at all². Above that, you register for Self Assessment, file a tax return each year, and pay your bill by midnight on 31 January following the tax year³.

This page walks through each task in order: what self-employment means, how to register, how tax and National Insurance work, what records to keep, and how to replace the protections a job normally provides. It sits alongside other guides in the life events section, such as starting your first job, which covers the employed side of the same rules.

What being self-employed means

In law, a self-employed earner is someone who is "gainfully employed in Great Britain otherwise than in employed earner employment"⁸. For benefit purposes, gainful self-employment means the Secretary of State has determined that you are carrying on a trade, profession or vocation as your main employment, that your earnings from it are self-employed earnings, and that it is organised, developed, regular and carried on in expectation of profit⁹. In plain terms: you run a real business, you expect it to make money, and you do it regularly rather than as a one-off.

HMRC's own definition is simpler. You are self-employed if you are either a sole trader or an individual in a business partnership¹. Being in partnership means you are self-employed jointly with one or more other individuals and have agreed to share the work and responsibilities¹⁰.

Whether you count as employed or self-employed is not just about what you call yourself. TaxAid, a charity that helps people on low incomes with tax problems, lists the practical signs: a self-employed person will typically be raising invoices, providing their own tools, and responsible for completing the work correctly at their own risk¹⁰. An employee, by contrast, will not usually have to deal with HMRC directly unless their tax code is wrong, they are claiming expenses, they have several jobs or untaxed income, or they are also self-employed¹⁰.

The distinction matters because it drives who handles your tax, what benefits you can claim and what employment rights you have. If you are unsure of your status, this is one of the first things to settle, and the free help sources listed at the end of this page can talk it through with you.

Sole trader or limited company: how each one works

Most people who become self-employed do so as sole traders. You and the business are the same thing in tax terms: you pay Income Tax on your profit, and you are personally responsible for any debts. If you run a limited company, you are not "self-employed" in HMRC's terms, even if you are the owner and the sole employee¹. A company is a separate legal entity, and you would normally be its director and an employee, taking a combination of salary and dividends.

The choice affects more than tax. For benefits, the rules cut across the two worlds. Universal Credit guidance says that claimants trading through a limited company are still required to report themselves as self-employed, and at a self-employment interview a work coach will decide whether the business could have a similar set-up to a sole trader's¹¹. So a limited company does not automatically take you outside the benefit rules that apply to the self-employed.

For budgeting purposes, debt advice guidance applies to all three structures: if you are a sole trader, a partner in a partnership or a director of a limited company, you can use the same approach to fill in a budget¹². One rule is worth knowing early: if you are a sole trader or in a partnership, you are taxed on your profit before drawings, not on how much or how little you actually take out of the business¹². Taking less money out does not reduce your tax bill.

Setting up as a sole trader is cheaper and simpler, and suits many people starting out. A limited company can suit higher earners or those wanting to limit personal liability, but it brings company filing duties and more complex tax. Many people start as sole traders and incorporate later. If you are weighing this up, it is one of the points where paid professional advice from an accountant can pay for itself, but the free guidance sources listed later can help you understand the basics first.

Registering with HMRC for Self Assessment

Registration is the first formal step. HMRC launched an improved Self Assessment registration service, and it is available to people who are newly self-employed and have earned gross income over £1,000⁴. Guidance aimed at self-employed students is firmer on timing: you must register as self-employed within three months of starting work¹³.

Registering matters beyond tax. If you are self-employed and claiming Maternity Allowance, you must be registered for Self Assessment with HMRC, and not registering, or registering late, may lose you some or all of your entitlement¹⁷. To qualify for Maternity Allowance as a self-employed claimant, you must have been registered with HMRC as gainfully self-employed in the UK for at least 26 of the 66 weeks before the baby's due date¹⁸. Our guide to having a baby covers the benefit side in full.

A few related registrations can catch people out:

• Savings interest: if you have savings interest of more than £10,000 and do not already complete a Self Assessment return, you will need to register¹⁹.
• Child Benefit: the High Income Child Benefit Charge is paid through Self Assessment where it applies²⁰.
• Voluntary National Insurance: if you pay voluntary Class 2 contributions but not through Self Assessment, you need to register with HMRC separately²¹.
• VAT: you do not need to register for VAT if your yearly sales are below the registration level shown on HMRC's Tax allowances and amounts guide¹².

Once registered, you fill in the self-employment section of your tax return each year. HMRC's guidance on this section confirms you can deduct allowable costs to work out your taxable profit, provided they qualify²².

Income Tax on self-employed profits

As a sole trader, you may need to pay Income Tax on your profits²³. The profit is what is left after allowable expenses, not your turnover. HMRC's guidance on Income Tax sets out the bands and allowances that apply, including the trading allowance: the first £1,000 of income from self-employment is tax free². If your income is below that, you may not need to register at all.

The Personal Allowance, the amount of income most people can earn before paying tax, is reduced for people with income above £100,000 after certain allowable deductions such as pension and gift aid contributions²⁴. This is a cliff edge worth knowing about if your business takes off: as income rises above £100,000, the allowance is progressively lost, which can push the effective rate on that slice of income much higher than the headline band.

If you are both employed and self-employed, the two incomes are combined for the purposes of allowances and bands. You may pay Class 1 National Insurance as an employee as well as Class 4 National Insurance as a self-employed person, with lower and upper limits for contributions calculated through Self Assessment¹⁰. Your employment income goes in the employment pages of the same return, and HMRC runs a webinar covering record keeping, how to fill in the return, tax relief for employment expenses, and student loan and postgraduate loan repayments²⁵.

Setting money aside for the bill is the practical discipline that catches most new sole traders. Because nothing is deducted as you go, the whole tax and National Insurance bill arrives at once. Debt advice guidance suggests paying regular amounts into a separate account to plan ahead and keep up with bills, with direct debits or standing orders taking the payments automatically¹². Our personal tax section explains the bands and allowances in more detail.

National Insurance when you work for yourself

National Insurance is what builds your entitlement to the State Pension and some benefits, so it matters even in years when your profits are small. The rules changed significantly from 6 April 2024. Self-employed people with profits above £12,570, the lower profits threshold, are no longer liable to pay Class 2 National Insurance contributions; instead they are treated as having paid them²⁶. The legislation makes clear this treatment applies to earners with profits at or above the small profits threshold, and it removed the liability to pay Class 2²⁶. A Senedd committee report confirms the same position: from 6 April 2024, self-employed people with profits above £12,570 are no longer liable to pay Class 2 and are treated as having paid it²⁷.

Below that level, the position depends on your profits:

• Profits under £6,845 a year: you can voluntarily pay Class 2 contributions²⁸.
• Gross income of £1,000 or less, or gross income over £1,000 with profits under £7,105: you can pay Class 2 or Class 3 voluntary contributions²⁹.
• Certain specific jobs: self-employed examiners, moderators, invigilators or exam question setters, landlords eligible to pay Class 2, ministers of religion without a salary or stipend, and people making investments not as a business and without a fee or commission can also pay voluntary contributions²⁹.

Class 2 contributions are not just a tax. They entitle you to the basic State Pension, but not the additional State Pension³⁰. That is a real gap compared with employees, whose Class 1 contributions can build additional State Pension. Voluntary contributions can fill gaps in your record, and people who have lived or worked abroad have their own rules for voluntary contributions from 6 April 2026¹⁸.

National Insurance also affects which benefits you can claim. New Style Jobseeker's Allowance is not available to people who were self-employed and only paid Class 2 National Insurance contributions, unless they worked as a share fisherman or volunteer development worker³¹. If you reach State Pension age and then start working for yourself, you are still classed as a sole trader and must follow the rules for self-employed tax, though National Insurance itself stops¹⁴.

Allowable expenses reduce the profit you are taxed on

Allowable expenses are the business costs you deduct from your turnover to work out your taxable profit before paying Income Tax¹. HMRC's own example shows the effect: if your turnover is £40,000 and you claim £10,000 in allowable expenses, you only pay Income Tax on the remaining £30,000¹.

The key rule is that you can only claim allowable expenses for the business costs¹. Where an item is used for both business and personal reasons, only the business proportion can be claimed. This is where a separate business bank account earns its keep: keeping business income and outgoings apart from household money makes it far easier to keep the records you or your accountant will need to fill in tax returns each year¹².

Common mistakes include claiming personal costs outright, or failing to claim legitimate business costs at all, which means paying more tax than you owe. HMRC's guidance on the self-employment pages of the tax return confirms the same principle: you can deduct some of these costs to work out your taxable profit as long as they are allowable expenses²². If you are unsure whether a cost qualifies, the free tax help charities listed at the end of this page can advise before you file, which is much cheaper than putting things right afterwards.

Keeping records and filing your tax return

You need to keep records if you have to send HMRC a Self Assessment tax return¹⁶. The purpose is practical: you need your records to fill in your tax return correctly, and if HMRC checks your return, they may ask for the documents behind it¹⁶. If you are self-employed, you must also keep records for business income and outgoings¹⁶. Keeping them helps you work out your profit or loss for your tax return²³.

The deadlines fall in a fixed pattern after the tax year ends on 5 April. The paper return deadline is 31 October, earlier than the online deadline³². Your bill is due by midnight on 31 January following the tax year you are paying for³. Where payments on account apply, the second one is due by 31 July³. HMRC's guidance on understanding your Self Assessment bill explains how the bill is built up, including payments on account towards the following year³.

Miss a deadline and the costs stack up:

The 5% penalties at 30 days, 6 months and 12 months come from HMRC's policy factsheet on timely payments in Income Tax Self Assessment⁵. If you cannot pay, the worst move is to ignore it: HMRC's guidance on penalties sets out the position, and the debt advice sources listed later can negotiate on your behalf. If you live abroad, the same Self Assessment rules apply to UK income, with the same deadlines³².

Protecting your income without sick pay

Self-employed people have no statutory sick pay, no employer topping up a pension and, in most cases, no redundancy safety net. That means protection has to be built by you, and the earlier the better.

The first layer is an emergency fund. NS&I's guidance on emergency funds recommends having money set aside to cover surprises, which for a self-employed person includes the months when work dries up as well as the months when you cannot work through illness³⁵. Debt advice guidance adds the practical structure: a separate account for regular bills, funded by standing order, so that a quiet month does not immediately become a missed payment¹².

The second layer is insurance. Income protection insurance, as the Financial Ombudsman Service describes it, "protects your income if you fall ill and can't work. It pays a percentage of your income each month"³⁶. Personal accident insurance is a related product the Ombudsman can handle complaints about³⁶. These policies vary widely in what they cover, how long they pay out and what they exclude, so the policy documents matter more than the headline price. Our protection insurance section explains the types of cover side by side.

The third layer is knowing where the safety nets are. Free, independent help is available from many organisations, and the guidance is to always get free, independent help before you pay a commercial service³⁷. If debts build up, avoid illegal lenders: loan sharks are a recognised problem, and free advice exists to deal with them³⁷. Where a mortgage falls behind, repossession is the legal process a lender must follow, and free advice is available at every stage³⁸. Our debt section sets out the full range of free options.

Pensions when there is no employer contribution

The biggest long-term gap in self-employment is the pension. Eligible employees are automatically enrolled into a pension scheme by their employer; self-employed people are not³⁹. The Family Resources Survey, the government's official household income statistics, found that over the past decade pension scheme participation among the self-employed has remained fairly stable at between 16% and 20%⁴⁰, and the most recent survey confirms the self-employed are not eligible for automatic enrolment⁷. A parliamentary committee put the contrast starkly: pension saving among the self-employed has declined since the mid-1990s and stands at 16%, compared with 88% of workers eligible for auto-enrolment⁴¹.

Without an employer, you have to choose and run the pension yourself. The options are:

• A personal pension, which official guidance says may be suitable if you are self-employed and do not have access to a workplace pension, are not working but can afford to pay in, want to save more for retirement, or are offered one through a workplace scheme⁴².
• A stakeholder pension, which the same guidance lists as suitable for the self-employed without a workplace pension, among others⁴³.
• NEST, the scheme set up for automatic enrolment, which a self-employed person or single company director can also use; you do not have to enrol yourself in a workplace pension⁴⁴.

The tax treatment is the one advantage that survives self-employment: contributions still receive tax relief, and employers do not pay National Insurance on pension contributions, whereas employees and self-employed people do³⁹. If you later take a job, your new employer must enrol you if you meet the age and earnings rules, and if you earn less than £6,240 a year and ask to join, the employer does not have to contribute but can choose to⁴⁵. Pension contributions can also stop during unpaid periods: if you are not getting paid on maternity leave, your employer does not have to make pension contributions unless your contract provides for it⁴⁶.

If you are approaching this from retirement rather than the start of a business, our retiring checklist and the pensions section cover the drawing-down side. Money saved into a pension is an investment: the Financial Services Compensation Scheme protects eligible investments up to its limits if a provider fails⁴⁷, and the Financial Ombudsman Service handles complaints about pensions organised by employers⁴⁸.

Borrowing and a mortgage when you are self-employed

Lending is where self-employment is felt most keenly, because lenders want evidence of a stable income. The good news, as Which? reports, is that "there's no such thing as a 'self-employed mortgage': you'll be applying for the same mortgage products as employed homebuyers"⁴⁹. The difference is the paperwork. Most lenders ask for tax calculations or SA302 forms for three years, one for each of the past three years, though some accept two⁴⁹.

On affordability, Which? reports that "you'll usually be allowed to borrow up to four-and-a-half times your annual household income, although this varies" between lenders⁴⁹. Because a self-employed income can swing from year to year, lenders tend to average profits over the years they look at, which is another reason to keep clean records and file returns on time: the documents that prove your income to HMRC are the same ones a lender will ask for.

The practical steps that help are largely the same as those elsewhere on this page: a separate business bank account so income is easy to trace¹², returns filed on time so there is no gap in the paper trail³⁴, and a credit record kept in good shape, which our credit scores section explains. If you are borrowing while your business is young, expect to provide more evidence than an employed applicant, and expect the process to take longer. Our mortgages section covers the buying process itself.

Where to get free help and guidance

You do not have to pay for the basics, and paying for help you could have had free is the most common avoidable mistake. MoneyHelper.org.uk offers free, impartial guidance that is backed by government, and its support and guidance are free³⁵. Your local council can also be a source of free advice³⁸.

For tax specifically, charities such as TaxAid provide independent help, including working out whether you are employed or self-employed¹⁰. For debt, Business Debtline's guidance on business and household budgets is free¹², and the rule of thumb from official guidance is simple: always get free, independent help before you pay a commercial service³⁷.

Where paid help is worth considering, an accountant typically earns their fee through the tax they save and the penalties they prevent, but the decision on whether to pay is yours, and the free sources above can tell you what you are entitled to before you commit to anything. Related pages that may help include losing your job, for people moving from employment into self-employment, and the benefits section for what the self-employed can and cannot claim.