QuikTax

A little less tax guesswork

What you earn.
What to set aside.

A clearer planning picture for your business, with your PAYE job kept in perspective. Start with a few numbers.

Your year, in numbers.

Money earned by your business. Do not include PAYE salary.
Include eligible mileage deductions here once, if using that method.
Also employed? Add PAYE details
Use taxable pay, not necessarily your contractual gross salary.
Actual income tax deducted. Do not include employee National Insurance.
See your estimate ↓

Calculated in your browser. Your figures are not saved or sent to QuikTax.

2026/27 · Your planning estimate

Estimated Self Assessment balancing payment

£6,715.80

Not an HMRC account balance. Excludes payments on account.

01 / PAYE employment

Taxable employment income£0.00
Estimated employment-only Income Tax£0.00
Actual PAYE income tax deducted£0.00
Employment tax remaining£0.00

02 / Your business

Turnover£48,000.00
Allowable expenses£9,600.00
Taxable profit£38,400.00
Additional Income Tax from the business£5,166.00
Self-employed Class 4 NI£1,549.80
Incremental business tax + NI£6,715.80

03 / Overall Self Assessment

Combined Income Tax estimate£5,166.00
Less actual PAYE tax deducted£0.00
Add Class 4 NI£1,549.80
Estimated balancing payment£6,715.80
See the calculation basis
Personal Allowance£12,570.00
Combined taxable income£25,830.00
Income Tax before Marriage Allowance£5,166.00

No Marriage Allowance reduction applied. Employment and business share one Personal Allowance. Business Income Tax is combined tax less employment-only tax.

A useful estimate, with clear boundaries.

For 2025/26 and 2026/27, this estimator uses England, Wales and Northern Ireland non-savings Income Tax bands: 20%, 40% and 45%, a £12,570 Personal Allowance (tapered above £100,000), and Class 4 NI of 6% between £12,570 and £50,270 profit, then 2%. It assumes you are liable for Class 4 and below State Pension age. Scottish tax is not supported.

Actual expenses are used; the £1,000 trading allowance is not applied as well. No loss-relief election, pension relief, Gift Aid, student loans, other income, Child Benefit charge, VAT calculation, CIS deductions, voluntary Class 2 NI or employment/self-employment NI interaction is modelled. PAYE inputs are not stored or linked to the iPhone app.

This is a planning tool, not tax advice or a return. HMRC balances can include earlier amounts, payments on account, interest and adjustments. Check your complete circumstances with HMRC or a qualified adviser.

HMRC Income Tax rules ↗HMRC self-employed NI ↗Marriage Allowance eligibility ↗

Rules checked 2 November 2026. Only the listed years are supported.