United Kingdom

Calculators on public formulas, nothing more

Each tool computes a published statutory schedule: the mechanics a regulator prints, with the figures dated and the math self-tested. Where a number would need licensed judgement, the tool says so and stops rather than guessing.

Free	No sign-up, no email wall. 1 tools on this market.
Sourced	Every figure carries the statute or schedule it came from, and the date we read it.
Bounded	Deadlines, fees and penalties. Never a liability, and never a legal determination.

Companies House late-filing penalty checker
Four bands, and the penalty doubles if last year’s accounts were late as well. It is automatic and appeals rarely succeed, so the calendar matters more than the argument.