CORPORATION TAX CALCULATOR
CORPORATION TAX UK Seller Calculator
See what your company owes at FY2026 rates, and whether you’re in the 26.5% marginal band, with a free calculator and Excel workbook.
Corporation Tax Calculator
UK corporation tax has two headline rates and a strange middle: 19% up to £50,000, 25% from £250,000, and an effective 26.5% on every pound in between. This calculator shows which of the three your company is actually paying, on FY2026 rates.
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Enter your taxable profits to see the tax.
Your band limits –
Marginal relief –
Marginal rate on the next £1 –
FY2026 rates, from 1 April 2026. Assumes a 12-month accounting period and no dividends received from other companies. This is the arithmetic, not advice: reliefs, group questions and what counts as an associated company can all move the answer.
Take this calculator into Excel
The workbook version shows every step of the computation, runs a profit planner across eight profit levels so you can see the 26.5% band, and works out what a well-timed £10,000 pension contribution or capital purchase would actually save at your profit level.
Download the Excel workbook Profits heading into the 26.5% band? Get in touchFAQs
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We’re certified partners with Xero and QuickBooks. Our digital-first approach means you’ll always have real-time access to your financial data.
We offer fixed monthly packages with no hidden fees. Pricing depends on your business size and the level of support you need — but you’ll always know exactly what you’re paying for.
Absolutely. We handle VAT, corporation tax, self-assessments, and payroll tax. We also manage HMRC correspondence on your behalf to ensure you never miss a deadline.
No. While many of our clients are London-based, we also support businesses across the UK and ecommerce sellers worldwide through our cloud-based systems.
RESOURCES
Fresh takes on business and accounting.
Company law allows accounts to run for 18 months; corporation tax never allows an accounting period longer than 12. Here is how the split is drawn.
The associated companies rules get more involved once a group has layers. Sub-subsidiaries, dormant holding companies and short accounting periods, worked through in a single example.
An acquisition partway through the year still counts as an associated company for the whole accounting period. What that does to your thresholds, and to your tax bill.
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