First-Year Checklist for a New Sole Trader

Short answer

The most important first-year steps for a sole trader are: registering with HMRC if your income is over the trading allowance, keeping clear records from the start, understanding the Self Assessment tax return dates, and setting money aside for tax as you go. Most other admin follows from these habits.

First: check whether you are trading

Before focusing on admin, it is worth confirming that your activity counts as trading. Activities carried out regularly, with a view to profit, and involving goods or services are generally treated as trading. Occasional personal activity, such as selling personal possessions, is generally not. If you are unsure, the Self Assessment Checker and HMRC's own check tool on GOV.UK are useful first checks.

Registering as self-employed

If your gross trading income is expected to be over £1,000 in the tax year, you will generally need to register for Self Assessment as a self-employed person. Registration is done through the GOV.UK set-up-as-sole-trader service. HMRC's guidance sets out the expected timing for registration.

• Registration is separate from opening a bank account or setting up invoices
• You will receive a Unique Taxpayer Reference (UTR) by post after registering
• Registering early gives you time to understand the system before your first tax return

Setting up basic records

From the day you start trading, keep clear records of your income and expenses. HMRC expects self-employed people to keep records that support their Self Assessment returns.

• Record every payment received: date, amount, who from
• Record every business expense: date, amount, what for, supplier
• Keep receipts and invoices for expenses
• HMRC guidance recommends keeping records for at least 5 years after the 31 January filing deadline for the relevant tax year

Invoices and payment records

Invoices are not a legal requirement for every sole trader transaction, but they are practical. A basic invoice should include your name or trading name, the date, what was supplied, and the amount. Keeping a log of invoices sent and payments received helps you track what you are owed and provides clear income records for your tax return.

Keeping receipts and expense evidence

Expenses that are wholly and exclusively for your business may be deductible when calculating your taxable profit. Keep evidence of every expense you intend to claim. Digital photos of receipts are generally acceptable. The types of expenses that may be allowable depend on your specific business - this article does not cover individual expense advice.

Separating business money

There is no legal requirement for a sole trader to have a separate business bank account, unlike a limited company. However, keeping business income and expenses separate from personal finances makes it much easier to identify your business position at the end of the year. Many sole traders use a separate account or card for business transactions, even if it is not a formal business account.

Tax return dates to understand

The UK tax year runs from 6 April to 5 April the following year. As a self-employed sole trader, you file a Self Assessment tax return each year for the income earned in the previous tax year.

• Online filing deadline: 31 January following the end of the tax year
• Paper return deadline: 31 October following the end of the tax year
• The balance of tax owed is due by 31 January
• Payments on Account (advance payments towards the next year's tax) may apply in some circumstances

What to review each month

A simple monthly habit makes end-of-year filing much easier:

• Record all income received in the month
• Record all expenses paid, with evidence kept
• Check invoices are settled or chase any outstanding
• Set aside a portion of income towards your future tax bill

What does not matter for every beginner

Not every sole trader needs to worry about VAT (unless turnover approaches the registration threshold), payroll (unless you take on staff), CIS (unless you work in qualifying construction activity), or complex corporate structures. Many first-year sole traders can keep things simple. If any of these areas become relevant as your business develops, that is the time to review them.

When to get professional advice

This checklist is general guidance for UK beginners. If your situation involves employees, significant income, complex expenses, or prior years to sort out, a qualified accountant can help you build the right foundations from the start. The free Self Assessment Checker is a starting point for checking whether a return may be required.