Sole Trader Tax Calculator 2026/2027

Tax Year:

Tax Code (PAYE side):

Self-employment turnover £:

Allowable expenses £:

Additional PAYE income £:

Pay Class 2 NI voluntarily (State Pension credit, ~£180/year)

Scottish taxpayer (uses SRIT bands)

Trading profit = turnover − expenses, with the £1,000 Trading Allowance applied automatically when it gives a smaller taxable profit.
Class 4 NI: 6% on profit between £12,570 and £50,270, 2% above (post-April 2024).
Class 2 NI: voluntary since April 2024 (used to be mandatory). Worth paying if your profit is under the Small Profits Threshold and you want a State Pension credit for the year.
Optional PAYE income stacks with self-employment income for income tax band placement, but Class 1 NI on PAYE and Class 4 NI on self-employment are computed separately.

Sole Trader / Self-Employed

Models self-employment income via Self Assessment. Optional PAYE-side input handles the common UK case of a side-hustler combining freelance with a part-time PAYE job.

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