← All free tools Free tool

Statutory interest calculator

See how much interest an overdue retention tranche has actually earned, using the 8%-above-base-rate margin. Nothing is sent to a server.

Overdue retention

Overdue amount

Release date (when it became due) Bank of England base rate

Held at 3.75% as of 30 July 2026. Edit if it's changed since. Calculate as of

Interest owed

Enter a release date above to see interest owed.

Holdback adds this interest to formal release applications automatically, once a tranche is overdue. Send us your last ten completed jobs and we'll show you exactly what's claimable now, free.

Get your free audit