Going freelance is one of the most liberating moves you can make in your career, but it comes with a to-do list that has nothing to do with the work you actually want to sell. Before you take on your first client, you need to get the admin right. Here is a practical walkthrough of the essentials that will keep you compliant, organised and free to focus on the job.

Choose the right business structure

Most new freelancers in the UK start as a sole trader. It is straightforward, cheap to set up, and means you simply declare your income through Self Assessment. You keep all your profits after tax, but you are personally liable for any debts the business incurs.

A limited company is the other common route. You become an employee and a shareholder of your own company, which can be more tax-efficient once your profits reach a certain level, and it separates your personal finances from the business. The trade-off is more paperwork, including annual accounts and a confirmation statement filed at Companies House.

• Sole trader: minimal admin, personal liability, profits taxed as income.
• Limited company: more admin, limited liability, potential tax savings on higher profits.
• Not sure yet? Many freelancers begin as sole traders and incorporate later as their income grows.

Whichever you pick, be honest about your appetite for admin. The structure that saves tax on paper is not worth it if you dread the paperwork every quarter.

Registering with HMRC

If you are going sole trader, you need to register for Self Assessment with HMRC. You can do this online, and you will be sent a Unique Taxpayer Reference (UTR) in the post, so allow a couple of weeks. Crucially, you must register by 5 October following the end of the tax year in which you started trading. The UK tax year runs from 6 April to 5 April, so a business started in June 2025 would need registering by 5 October 2026.

If you go limited, Companies House registration comes first. You will then register the company for Corporation Tax, and register yourself for Self Assessment if you take dividends or a salary requiring a return. You will also need to set up a PAYE scheme if you pay yourself a salary above the National Insurance threshold.

Keep your UTR, company number and Government Gateway login somewhere safe. You will need them repeatedly.

Opening a business bank account

Strictly speaking, sole traders are not legally required to have a separate business account, but mixing personal and business spending is a recipe for a miserable tax return. A dedicated account makes your bookkeeping dramatically easier and looks more professional when clients pay you.

High street banks, challenger banks and building societies all offer business accounts, and many have free introductory periods for new businesses. What to look for:

• No monthly fee, or a low one, for the first year or two.
• Free UK transfers and a decent number of free transactions.
• Easy integration with accounting software.
• A linked savings pot for your tax bill, so the money is not sitting in your current account tempting you.

For limited companies, a business account is essential. You will need your certificate of incorporation and proof of identity and address for the directors. Expect the process to take anywhere from a few minutes to a couple of weeks.

Understanding tax and National Insurance

As a sole trader, you pay income tax on your profits, not your turnover. Your first £1,000 of trading income is covered by the trading allowance, though you cannot claim expenses as well if you use it.

You also pay Class 4 National Insurance on profits above a set threshold, and Class 2 contributions are treated as paid if your profits are above the small profits threshold, protecting your State Pension record. Thresholds change, so check the current figures on the government website each April.

Two things catch new freelancers out:

• Payments on account. If your tax bill exceeds £1,000, HMRC will ask for an advance payment towards next year's bill, plus the balancing payment. Set aside a percentage of every invoice as it lands.
• VAT. Once your rolling twelve-month turnover passes the VAT registration threshold, you must register. Many freelancers register voluntarily before that to reclaim input VAT.

If you are a limited company, you will handle Corporation Tax on profits, plus VAT and PAYE where applicable. This is the point where an accountant earns their fee.

Keep records from day one

Every freelance tax return rests on evidence. Save every invoice, receipt, bank statement and contract. Digital records are fine, and HMRC's Making Tax Digital rules increasingly expect them.

Claim what you are entitled to: software subscriptions, a proportion of home heating and broadband, professional memberships, insurance, and travel to clients. Track your mileage. Keep personal and business spending separate so you are not untangling it in January.

A simple routine works well: log expenses weekly, reconcile your bank account monthly, and put aside a fixed slice of each payment into a tax pot immediately.

Protect yourself and your income

Freelancing means no sick pay and no paid holiday, so build a small buffer before you need it. Consider professional indemnity insurance if clients require it, and income protection if you rely entirely on your own output.

Chase late payments politely but firmly, and put payment terms in every contract. A clear late-payment clause is not aggressive; it is professional. Finally, do not forget a pension. A self-invested personal pension or a simple stakeholder scheme keeps your long-term plans on track, even if contributions are small at first.

Get the foundations right now and the rest of your freelance career becomes far simpler. Start with the structure, register properly, separate your money, and stay on top of the paperwork. Your future self will thank you.