Work out what you may legally add to an overdue B2B invoice: statutory interest at the locked half-year rate, plus the automatic fixed compensation almost every invoice forgets.
Statutory rate
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Reference rate used
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Interest per day
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Interest so far
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Fixed compensation
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Total you can invoice
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Lost if you skip it
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Half-year rate lock Applies the reference rate in force on 31 December or 30 June before the invoice fell late, which is the rate the statute points at - not the rate in force today.
Fixed compensation tier Adds the automatic recovery sum for the size of the debt: 40, 70 or 100 pounds in the UK, 40 euro in the euro area. It is owed even if the contract says nothing.
German nine-point margin Uses the nine percentage points that section 288(2) BGB gives on German B2B debts, instead of the eight-point EU minimum that general-purpose calculators apply everywhere.
Shortfall against the shortcut Shows in money what the invoice loses if the fixed sum is left off and the flat eight-point margin is used - the two mistakes that make up almost every under-billed claim.
Claim ledger export With a licence key: downloads the worked figures as a .csv row you can keep, hand to your accountant, or attach to a letter before action.