Corporation Tax & Limited Company calculators
26 free calculators covering corporation tax & limited company, on 2026/27 and 2025/26 UK rates. Every result shows the bands and assumptions behind it, so you can check the numbers before you act on them.
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Work out your limited company corporation tax for 2026/27, including the 19% small profits rate, the 25% main rate and marginal relief between £50,000 and £250,000.
2026/27R&D tax credit calculator
Estimate your R&D tax relief under the merged scheme (20% RDEC) or the enhanced support for R&D intensive loss-making SMEs, from your qualifying expenditure.
2026/27Late filing penalty calculator
Work out Companies House late filing penalties and HMRC corporation tax penalties for a limited company, by how late the accounts and return are.
2026/27Annual Investment Allowance (AIA) Calculator
See how much of your plant and machinery spend qualifies for the £1m Annual Investment Allowance in 2026/27 and the corporation tax saving it creates.
2026/27Apprenticeship Levy Calculator
Check whether your company owes the apprenticeship levy in 2026/27, using the 0.5% rate and £15,000 allowance, and see the monthly cost.
2026/27Associated Companies Tax Calculator
Find out how associated companies split the corporation tax £50,000 and £250,000 thresholds in 2026/27 and the extra tax that results.
2026/27Business Rates Calculator
Estimate your company's annual business rates bill for 2026/27 from the rateable value, the small business multiplier and small business rate relief.
2026/27Capital Allowances Calculator
Work out capital allowances on plant and machinery for 2026/27, splitting spend between the Annual Investment Allowance and the 18% main pool.
2026/27Company Car Tax Calculator
Calculate the benefit in kind tax on a company car for 2026/27, covering the appropriate percentage, personal tax and employer Class 1A NIC.
2026/27Company Structure Comparison Calculator
Compare take-home income as a sole trader against a limited company for 2026/27, factoring in corporation tax, dividend tax and National Insurance.
2026/27Directors Loan Calculator
Work out the section 455 tax on an overdrawn director's loan for 2026/27, plus the benefit in kind if the loan is interest-free or low-interest.
2026/27Disincorporation Relief Calculator
Estimate the corporation tax impact of transferring your company's business back to sole trader or partnership status in 2026/27.
2026/27EIS Tax Relief Calculator
Calculate the income tax relief and capital gains deferral available on an EIS investment for 2026/27, up to the £1m annual limit.
2026/27EIS and SEIS Combined Relief Calculator
Compare income tax relief and effective net cost across SEIS and EIS investments for 2026/27, using the 50% and 30% relief rates side by side.
2026/27Electric company car tax calculator
Work out the 2026/27 benefit in kind tax on an electric company car for both the director and the company, using the current EV appropriate percentage.
2026/27Full expensing calculator
See the corporation tax saving from full expensing on new plant and machinery in 2026/27, compared with the Annual Investment Allowance and standard writing-down allowances.
2026/27Group relief calculator
Calculate the corporation tax saved by surrendering a loss-making company's losses to a profitable group member under group relief in 2026/27.
2026/27Loss relief calculator
Estimate the corporation tax refund from carrying a trading loss back against last year's profit, or the future saving from carrying it forward, for 2026/27.
2026/27PAYE vs limited company calculator
Compare take-home pay as a PAYE employee against running your own limited company on the same day rate, including 2026/27 tax, NIC and dividend rates.
2026/27Profit split optimiser
Compare different director salary and dividend combinations for the same company profit to find the mix with the lowest combined tax for 2026/27.
2026/27Property capital allowances calculator
Estimate the Annual Investment Allowance and structures and buildings allowance available on a commercial property purchase or fit-out in 2026/27.
2026/27R&D tax relief calculator
Estimate your company's R&D tax relief under the 2026/27 merged scheme or the enhanced R&D intensive support scheme for loss-making, R&D-heavy companies.
2026/27RDEC merged scheme calculator
Work out the above-the-line RDEC credit and net cash benefit on qualifying R&D spend under the 2026/27 merged scheme, before and after corporation tax.
2026/27SEIS tax relief calculator
Calculate the income tax relief, potential capital gains reinvestment relief and effective at-risk capital on a SEIS qualifying investment for 2026/27.
2026/27Self-employed vs limited company calculator
Compare take-home profit as a sole trader against running the same business through a limited company for 2026/27, including Class 4 NIC and dividend tax.
2026/27Trading allowance calculator
Check whether the £1,000 trading allowance saves you more tax than deducting actual expenses on side income for 2026/27, and see the tax due either way.
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