Free calculators
The same maths our filing product runs — free to use, no signup. When you're ready to file, everything you see here happens automatically.
Corporation Tax calculator
Your company's tax bill with marginal relief worked out — the 19%–25% sliding scale explained in one number.
Making Tax Digital eligibility checker
Self-employed or a landlord? Find out when MTD for Income Tax becomes mandatory for you.
Late filing penalty calculator
What Companies House and HMRC charge when accounts or the tax return are late — and how fast it escalates.