Setting up as a sole trader
Setting up as a sole trader is one of the most straightforward ways to start a business in the UK. Unlike limited companies, there’s minimal red tape and lower set-up costs, making it an attractive option for many entrepreneurs. However, there are important decisions to make and obligations to meet to ensure you stay compliant with HMRC and avoid costly mistakes down the line.
Whether you’re launching a consultancy, freelance service or small retail operation, understanding your responsibilities as a sole trader will give you a solid foundation. This guide covers the essentials you need to know before you hang out your shingle.
Registering and notifying HMRC
The first thing to understand is that you must notify HMRC that you’re self-employed as soon as possible—ideally before you start trading. You can register online through HMRC’s online services, or by contacting the Self-Employment Services team. There’s no formal registration fee, but registering late can result in penalties.
You don’t need to register with Companies House as a sole trader; that requirement only applies to limited companies. However, if you trade under a business name that’s different from your own name, you’ll need to keep a record of it and be able to produce it if asked by HMRC or enforcement agencies.
Registration is crucial because it triggers your entry into the Self Assessment tax system. From that point forward, you’ll be required to submit annual tax returns and pay tax on your profits.
Understanding Self Assessment and tax deadlines
As a sole trader, you’re responsible for calculating and paying your own tax through Self Assessment. The tax year runs from 6 April to 5 April, and you must file your tax return by 31 January following the end of the tax year. Missing this deadline triggers automatic penalties: £100 for returns up to three months late, and further penalties thereafter.
For the 2024/25 tax year, basic rate Income Tax is 20% on profits between £12,570 and £50,270. If your profits exceed the higher rate threshold (£50,270), you’ll pay 40% on the excess. Additionally, you’ll need to pay National Insurance contributions. Provided you’re earning above the Small Profits Threshold (currently £6,725 for 2024/25), you’ll owe Class 2 National Insurance at a flat rate of £163.80 per year, plus Class 4 National Insurance at 9% on profits between £12,570 and £50,270, and 2% above that.
It’s worthwhile estimating your tax bill early. Many sole traders face a nasty surprise in January when their tax bill lands, so budgeting throughout the year makes the payment far less painful.
Keeping records and managing accounts
HMRC requires you to keep detailed records of all income and expenses for at least five years. This includes invoices, receipts, bank statements and payroll records (if you employ anyone). You don’t need to file formal accounts with Companies House, but you must be able to produce them if HMRC asks.
Using accounting software—even simple spreadsheets—makes record-keeping manageable and reduces the stress of tax return season. Record everything: materials, equipment, mileage, professional fees, rent and utilities. These legitimate business expenses reduce your taxable profit, so accurate tracking directly impacts your tax bill.
If your turnover exceeds the VAT threshold of £90,000 in a 12-month period, you must register for VAT. Below this threshold, registration is optional but can be beneficial if you’re selling to other businesses, as you can reclaim VAT on your purchases.
Insurance and other considerations
Operating as a sole trader means your personal assets aren’t protected if things go wrong. Consider whether public liability insurance, professional indemnity insurance or other cover is necessary for your industry. Whilst it’s not legally required for most sole traders, it’s often essential in practice.
You might also want to open a separate business bank account. Whilst not compulsory, it keeps your finances organised and demonstrates professionalism to clients and HMRC.
Getting started the right way
Setting up as a sole trader needn’t be complicated, but getting the basics right from day one pays dividends. Register with HMRC promptly, understand your tax obligations, keep meticulous records, and consider whether you need professional support.
For tailored advice, contact Severn Accounting — we’re here to help.