Calculators
Free UK tax & accountant calculators
Quick, no-signup estimates using 2026/27 UK rates — then compare accountants to get the real number for your business.
Turn an estimate into a conversation
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Prepare your records and compare what each quote includes, with a checklist tailored to your business.
Tax
Sole trader tax & NI
Estimate Income Tax and Class 4 National Insurance on your self-employment profit for 2026/27 — see what to set aside for self assessment.
Salary vs dividends
Compare take-home pay for a limited company director across salary and dividend splits.
Corporation tax
Estimate your limited company's Corporation Tax bill at 2026/27 rates, including marginal relief, and see how profit bands change what you pay.
Contractor take-home
Compare take-home pay outside IR35 (your own limited company) against inside IR35 (umbrella).
Payroll
VAT
Compliance
Accountant fees
Plan an accounting budget with monthly and annual estimates from our editorial UK fee benchmarks. Confirm the scope and price with a firm.
Late filing penalty
Estimate Companies House and HMRC self assessment penalties for a late filing — see how fines escalate the longer accounts or returns are overdue.
Do I need MTD?
Check whether Making Tax Digital applies to you in 2026, 2027 or 2028 — VAT, Income Tax, and why Corporation Tax is not in MTD.
Late payment interest
Work out statutory interest and compensation you can charge on overdue business invoices (Bank of England base rate + 8%).