Ad space

Self Assessment Tax Checker (2026/27)

Estimate how much Income Tax and Class 4 National Insurance you'll owe on self-employed profits for the 2026/27 tax year (6 April 2026 – 5 April 2027).

This is a general information estimate, not tax advice. It covers Income Tax and Class 4 NI only — it does not account for the trading allowance, capital allowances, Payments on Account, or other expenses and reliefs. Check your exact position with HMRC or a qualified accountant.

Your details

Your self-employment income after allowable business expenses.

Mandatory Class 2 NI was abolished from April 2024 for profits above £7,105 — your State Pension record is protected automatically above that level via Class 4.

£0
Estimated tax + NI owed
£0
You keep
0%
Effective rate

Breakdown

Net profit£0
Personal Allowance£0
Income Tax£0
Class 4 National Insurance£0
Voluntary Class 2 NI£0
Total due to HMRC£0
You keep£0

Income Tax by band

BandTaxed at this rateTax
Ad space

How this is calculated

Income Tax on self-employed profits uses the same Personal Allowance and rate bands as employed income: £12,570 tax-free (tapered away between £100,000 and £125,140), then 20% up to £50,270, 40% up to £125,140, and 45% above. Class 4 National Insurance is charged at 6% on profits between £12,570 and £50,270, and 2% above that. Mandatory Class 2 NI was abolished from April 2024 for anyone with profits above £7,105 — your State Pension record is protected automatically. Below that threshold, you can choose to pay voluntary Class 2 at £3.65 a week (£189.80 a year) to keep building your record. This tool doesn't include Payments on Account, which HMRC may require in advance for the following tax year.

Ad space