Toolsmith Software · Free tools

Tax set-aside calculator

Self-employed? Work out how much of every payment to put aside for the taxman, so January's Self Assessment bill never catches you out. UK sole-trader figures, 2026/27.

Expected profit this year (income after business expenses)

Other taxed income (e.g. a salary already taxed, optional)

Set aside

0% of profit

That's about

£0/month

Income tax£0

Class 4 National Insurance£0

Total to set aside£0

You keep (from profit)£0

Estimate for an England/Wales/NI sole trader, 2026/27: personal allowance £12,570 (tapered above £100,000), income tax 20/40/45%, Class 4 NI 6% between £12,570–£50,270 then 2% above. Assumes the personal allowance applies to your profit first. Doesn't include student loan repayments, Gift Aid, voluntary Class 2 contributions, or your first-year Payments on Account. Not tax advice — confirm with your accountant.

Built by Toolsmith Software — a tool that sets the money aside automatically every time you get paid is a great first automation. We build those.