How to Reduce Tax Legally If You’re Self-Employed

1. Claim the business expenses you are entitled to

Allowable expenses reduce the profit on which you pay Income Tax. Typical examples include software, phone and internet business use, accountancy fees, insurance, advertising, qualifying travel, staff costs and some working-from-home costs.

An expense is not allowable simply because it was paid from the business bank account. Where a cost has mixed private and business use, only the identifiable business element is normally deductible.

• Office and software costs
• Professional fees and business insurance
• Advertising and website costs
• Qualifying travel and business-use mileage
• Staff, subcontractor, stock and material costs

2. Compare actual expenses with the £1,000 trading allowance

The trading allowance can provide up to £1,000 of relief against qualifying trading income. But you do not normally claim the allowance and ordinary business expenses against the same income.

If turnover is £12,000 and actual allowable expenses are £2,400, actual expenses produce a taxable profit of £9,600. Using the £1,000 allowance instead would leave £11,000.

3. Check whether pension contributions could improve the tax position

Qualifying personal pension contributions can receive tax relief and may reduce adjusted net income. This becomes especially important as income approaches £100,000 because the Personal Allowance begins to taper away.

The standard annual allowance is £60,000 for 2026/27, although lower limits can apply and tax relief on personal contributions is also constrained by relevant earnings.

4. Use trading losses properly

A trading loss may be valuable. Depending on the circumstances, it may be carried forward against future profits of the same trade or relieved in other permitted ways.

The best question is not simply whether a loss can be claimed, but where it produces the greatest legitimate tax benefit under the available rules.

5. Get the tax treatment of equipment right

Computers, machinery, tools, vehicles and other assets can have different treatments depending on the accounting basis and type of purchase. Cash basis is now the default for many eligible sole traders.

Do not buy things purely for a deduction. Tax planning should improve the treatment or timing of genuine expenditure, not encourage unnecessary spending.

6. Review whether a limited company would actually be better

There is no universal profit level at which incorporation automatically becomes the right answer. A company introduces Corporation Tax, PAYE, employer NIC, dividend tax, filing obligations and extraction planning.

The comparison needs to reflect how much money you withdraw, your pension plans, administrative cost and whether profits will be retained for future investment.

7. Making Tax Digital for Income Tax has started

MTD for Income Tax began on 6 April 2026. The first mandatory cohort is based on qualifying income over £50,000 in 2024/25, followed by lower thresholds in later years.

Qualifying income broadly means gross self-employment and UK property income before expenses. Someone with £42,000 self-employment turnover and £11,000 gross rents can therefore have £53,000 qualifying income.

• Over £50,000 in 2024/25 → MTD from 6 April 2026
• Over £30,000 in 2025/26 → MTD from 6 April 2027
• Over £20,000 in 2026/27 → MTD from 6 April 2028