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Calculators and checklists for company owners, built by the person who files the returns. No selling attached.

These are the calculators and checklists: income tax, National Insurance, corporation tax, capital gains tax and stamp duty, plus checks for VAT, SEIS, R&D, CIS and the employment allowance. Fasih Khan built them around decisions company owners face. If you want the written explanation of a rule instead, the blog covers those.

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Every tool, in one place

The cards below list each calculator, checker and checklist. Scroll through them, or use the filters to narrow down to the topic you came here for.

Capital gains tax on property calculatorThe capital gains tax on property calculator shows the tax on selling a buy to let or second home in 2026/27, including costs of sale and...Capital gains tax on shares calculatorThe capital gains tax on shares calculator shows what a sale of shares, crypto, a business or other assets could cost you, with Business...Construction CIS and VAT health checkA construction CIS and VAT health check for limited companies: what to test in your returns, the April 2026 rule changes, and where money...Corporation tax calculatorCorporation tax calculator for 2026/27: see what your limited company owes on its profit, with marginal relief and associated companies...Employment allowance checkerAn employment allowance checker for limited company directors: who can claim the £10,500, why single-director companies cannot, and how to...Income tax calculatorIncome tax calculator for 2026/27: see what a salary leaves you after tax, pension and student loan, in Scotland or the rest of the UK.National Insurance calculatorThe National Insurance calculator shows employee, employer and Class 4 contributions for 2026/27, with the Employment Allowance, for...R&D tax credit eligibility checklistAn R&D tax credit eligibility checklist for UK limited companies: which projects qualify, which costs count, and the filing deadlines that...Salary and dividend plannerA salary and dividend planner for UK limited company directors: how the mix works in 2026/27, the allowances to check and where directors...Salary and dividends calculatorThe salary and dividends calculator shows what a director of a limited company keeps from a 2026/27 pay mix after company and personal tax.SEIS eligibility checklistA plain English SEIS eligibility checklist: the company tests, the trade tests, the share rules, and what HMRC wants to see before advance...Stamp duty calculatorStamp duty calculator for a residential purchase in England or Northern Ireland: bands, first-time buyer relief and the surcharges, for...Stamp duty on shares calculatorThe stamp duty on shares calculator shows what a buyer pays on a share transfer using a stock transfer form, for directors of UK limited...Switching accountants checklistA switching accountants checklist for limited company directors: what to check before you move, what the new firm does, what you sign, and...VAT scheme checker for online sellersA VAT scheme checker for online sellers in plain English: flat rate against standard, import VAT, marketplace rules, refunds and the traps...

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ACCA qualified, AAT licensed · Rated 5.0 on Google · Xero and QuickBooks certified · Luton office, clients UK-wide