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Sole Trader and Self Employment

Why does the first profitable year of self-employment cost so much more than the profit suggests? Because the timing, not the rate, is what catches people.

Sole Trader and Self Employment

The essentials

You and the business are one person

There is no company between you and the trade. Profit is taxed as your income, with Class 4 National Insurance on top, and the liabilities of the business are your own.

That simplicity is a real advantage while profits are modest. It stops being an advantage at the point where liability exposure or retained profit starts to matter.

The January problem

The balancing payment for the year falls on 31 January, and payments on account towards the next year fall on 31 January and 31 July. Each payment on account is half the previous year's bill, and they become due once that prior liability passes the small-liability threshold with most of the tax not already collected at source. In a first profitable year the balancing payment and the first payment on account land together, which is the double bill everyone remembers.

The habits that cost most

Running the business through a personal current account, keeping no mileage log, and treating the drive to a regular workplace as business travel. Each one is small until a year of them has to be reconstructed from a bank statement.

A year end that is not 31 March or 5 April is the quieter cost. Since the tax-year basis took effect, an off-cycle accounting date means apportioning two sets of accounts every year for no benefit.

Where a review of the figures usually starts

With the expenses actually claimed, tested against the way you really work rather than against a template. Capital purchases come next, because they are the ones most often put through as if they were running costs, and profit level comes last: at some point a company is worth modelling, and the only way to know is to model it.

The library

Every Sole Trader and Self Employment article

92 guides, written or reviewed by a specialist accountant and kept current.

Cash Basis Allowable Expenses: When You Deduct, Not What

Under the cash basis you deduct an expense in the tax year you pay it, not the year you are billed for it. The wholly and exclusively test still decides whether a cost is allowable at all. What the cash basis changes is timing, plus the treatment of capital spending, which comes off as an ordinary expense when paid instead of going through capital allowances. This page covers the timing rule, the ITTOIA 2005 s.33A excluded list, interest now that the £500 cap is gone, stock, and the errors that cost people money.

15 min read

Cash Basis: The Rules Since 6 April 2024

The cash basis means you count income when the money arrives and expenses when you pay them. Since 6 April 2024 it is the default way sole traders and partnerships of individuals calculate trading profit, there is no turnover threshold of any kind, and you leave it only by electing on your tax return to use traditional accounting. This page explains the rule, who is shut out, what changes in practice, and the three old drawbacks that no longer exist.

15 min read

Accountant for Content Creators: How Each Platform's Income Is Taxed in the UK

AdSense, TikTok Creator Rewards, Twitch payouts, Patreon memberships, brand deals and affiliate commission are all UK trading income once you are trading, but their VAT treatment splits sharply between UK and overseas payers. See every major platform in one table, when the £1,000 trading allowance runs out, how gifted products are valued, and a full multi-platform year worked through at 2026/27 rates.

7 min read

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