Tax basics for self employed people matter because, when you work for yourself, the responsibility for registering, keeping records, filing tax returns and paying tax sits with you. Whether you are freelancing, side hustling or running a sole trader business, understanding the basics helps you reduce stress, avoid HMRC problems and plan properly for the money you owe.

About this episode

If you are self-employed in the UK, tax may not be the most exciting part of running your business, but getting it right can save you money, time and anxiety.

In this episode, we explain what it means to be self-employed, when you need to register, what records you should keep, how tax and National Insurance are worked out, what expenses you may be able to claim, and why Making Tax Digital matters.

If you want a wider look at how tax affects your business structure, our episode on Tax and Your Self-Employed Business: Sole Trader or Limited Company? is a useful next step.

Why self-employed tax basics matter

Self-employed tax basics matter because there is no employer deducting PAYE tax before money reaches your account. You are responsible for telling HMRC what you earn, claiming expenses correctly, filing on time and having the money ready to pay.

Good tax habits also support good business habits. When you keep records, separate business and personal money, use proper systems and save as you go, you understand your numbers more clearly.

That clarity helps you make better decisions, avoid last-minute panic and keep more control over your business cash flow.

Key points from this episode

What does self-employed mean?

Being self-employed means you work for yourself rather than being employed through PAYE. You may call yourself a sole trader, freelancer, contractor or side hustler, but the key point is that you are responsible for your own tax affairs.

You are not running the business through a limited company. You may work alone or in a partnership, but as a self-employed person you must deal with registration, records, tax returns and payment responsibilities.

This also means you need to plan for the tax bill yourself. No employer is stepping in to deduct tax and National Insurance from your wages before you are paid.

Registering as self-employed

If your self-employed income is above the relevant threshold, you may need to register with HMRC through Self Assessment.

Registration gives you a Unique Taxpayer Reference, often called a UTR. This 10-digit reference is important when filing your tax return and communicating with HMRC.

The usual registration deadline is 5 October after the end of the tax year in which you started trading. Do not wait until the last minute. Getting registered early gives you time to prepare.

Keeping records

Good record keeping is one of the best habits you can build as a self-employed person. You need records so you can work out your profit, complete your tax return and support the figures if HMRC asks questions.

Useful records include invoices, receipts, bank statements, mileage logs, expense records and evidence of business income.

You can keep records manually, in spreadsheets or through accounting software. Digital tools can make the process easier because they help store documents, track income and expenses, and give you a clearer view of your business.

For more on why records matter, our episode on Bookkeeping for Small Business explains how bookkeeping supports better decisions.

How self-employed tax is worked out

Self-employed tax is usually based on taxable profit. In simple terms, that means business income minus allowable business expenses.

If you invoice clients for your services, your income is the money you charge. From that, you deduct costs that are allowable for tax, such as materials, business travel, software, tools, professional fees and other business costs.

The profit left after allowable expenses is then used to work out Income Tax and National Insurance. Tax bands, allowances and National Insurance rules can change, so current rates should always be checked before publishing or relying on figures.

National Insurance for self-employed people

Self-employed people may need to consider National Insurance as well as Income Tax. National Insurance helps build entitlement to certain state benefits and the State Pension.

The episode explains Class 2 and Class 4 National Insurance, but these rules and thresholds can change. That means the principle is useful, but the current figures should be checked each tax year.

Our episode on National Insurance easily explained is a useful follow-on if you want to understand this area in more detail.

Allowable expenses

Allowable expenses reduce taxable profit, but not every cost paid from your business account is allowable.

The general principle is that the expense should be for the purposes of the business. Common examples can include office costs, working from home, business software, travel, equipment, marketing, professional fees and business insurance.

Personal costs are not business expenses. If a cost has both business and personal use, such as a mobile phone, you may need to make a reasonable business/private split.

Working from home and business travel

If you work from home, you may be able to claim a proportion of household costs or use simplified rates, depending on your circumstances.

Business travel may also be claimable where the journey is genuinely for business. This can include mileage, public transport, accommodation or other travel costs where they meet the rules.

However, rates and methods can change, and once you choose certain methods, they may affect future claims. Always check the current rules before relying on old figures.

Making Tax Digital for self-employed people

Making Tax Digital is HMRC’s move towards digital tax reporting. For many self-employed people and landlords, this means keeping digital records and using compatible software to send updates to HMRC.

The rules are being phased in, and the start date depends on qualifying income. That makes it important to check whether and when Making Tax Digital applies to you.

Getting your records digital early can still help, even before the rules apply. It improves organisation, reduces errors and gives you better information about your business.

For a more detailed follow-on, listen to Making Tax Digital Quarterly Updates: What to Send and When.

Key dates for self-employed tax

There are three key dates to keep in mind. The usual online tax return and payment deadline is 31 January. The second payment on account, where relevant, is normally due on 31 July. The deadline to register for Self Assessment, where required, is usually 5 October after the end of the tax year.

Missing deadlines can lead to interest and penalties. Calendar reminders, early preparation and regular record keeping all reduce the chance of problems.

If payments on account are new to you, our episode on Payments on Account Explained: What They Are, When to Pay and How to Reduce Them explains how they work.

Saving for your tax bill

One practical habit is to save for tax as you go. Every time you invoice a client or receive payment, put a proportion into a separate tax savings account.

The exact percentage depends on your income, expenses and tax position. The point is to build the habit early, so the tax bill does not become a shock later.

Separating business and personal bank accounts also helps. It makes your records cleaner and gives you a clearer picture of how the business is performing.

What to check if you are self-employed

Have you checked whether you need to register with HMRC?
Do you have your Unique Taxpayer Reference?
Are your invoices, receipts and bank records organised?
Have you separated business and personal money?
Are you claiming only allowable business expenses?
Have you checked whether simplified expenses apply?
Do you understand your Income Tax and National Insurance position?
Have you planned for payments on account?
Have you checked whether Making Tax Digital applies to you?
Are you saving regularly for your tax bill?

FAQs about tax basics for self employed people

When do I need to register as self-employed?

You may need to register if your self-employed income is above the relevant threshold for the tax year. The usual deadline is 5 October after the end of the tax year in which you started trading.

Do self-employed people pay Income Tax and National Insurance?

Yes, self-employed people may pay Income Tax and National Insurance based on taxable profits. The exact amount depends on profits, allowances, thresholds and current tax rules.

What expenses can I claim if I am self-employed?

You can usually claim allowable business expenses that relate to running your business. Personal costs are not allowable, and mixed-use costs may need a reasonable business/private split.

Does Making Tax Digital apply to self-employed people?

Making Tax Digital for Income Tax is being phased in for sole traders and landlords based on qualifying income. Check the current thresholds and start dates before deciding what applies to you.

Episode Timecodes

00:00 – Why self-employed tax basics matter
00:50 – What the episode covers
01:08 – What it means to be self-employed
02:07 – Registering as self-employed and getting a UTR
03:33 – Why record keeping matters
05:01 – How self-employed tax is worked out
07:41 – National Insurance for self-employed people
08:47 – Allowable expenses
09:31 – Making Tax Digital
10:18 – Self Assessment deadlines and payments on account
11:01 – Saving for your tax bill
11:42 – Planning ahead and getting help
12:17 – Final thoughts

Related episodes

Key takeaway

Tax basics for self employed people are about more than submitting a return. They are about registering properly, keeping records, understanding tax and National Insurance, claiming expenses correctly, preparing for Making Tax Digital and saving before the tax bill arrives.

Good planning, clear records and early action reduce stress and help you keep more control over your business money.

Plan it, Do it, Profit.

“Understanding and managing your tax as a self-employed individual is key to running your business with less stress and more confidence.”

Further Support

The I Hate Numbers podcast helps business owners understand accounting, tax, finance, profit, cash flow, and business planning in a practical way. We simplify financial topics so you can make better decisions and feel more confident with your numbers.

You can also watch more practical finance and tax support on the I Hate Numbers YouTube channel, or listen and follow on Apple Podcasts.

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Tax Basics for Self-Employed People: Register, Claim Expenses and Plan Tax