Penalty interest

Definition

Penalty interest is an elevated rate applied when a borrower breaks the agreement. Under English law a clause that is a genuine pre-estimate of the lender’s loss is enforceable; one that is extravagant and punitive may be an unenforceable penalty. In practice it overlaps with default interest.

In plain terms

There is a line between compensating a lender and punishing a borrower — the law only enforces the former.

Why it matters for your company

Check any penalty clause is a fair loss estimate, and always talk to the lender before triggering it. See default interest.

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In practice

Picture a UK limited company that trips a covenant or misses a scheduled payment date on a business loan. The lender doesn't simply apply a headline extra rate on the whole balance without justification — it should be able to point to a genuine cost or loss the breach caused, such as the expense of managing an account that's fallen out of order. The clearer that link, the more defensible the charge.

For the company, the practical move is the same regardless of how the clause is worded: contact the lender as soon as a breach looks likely, rather than after it has already triggered. A director who flags a problem early is usually in a stronger position to agree a way through than one who lets penalty interest start accruing silently. See default interest for how the two concepts sit alongside each other in most agreements.

How lenders read it

A well-drafted penalty interest clause tends to survive scrutiny because it mirrors a lender's actual administrative and funding cost of a breach, not because of how it is labelled in the contract. Lenders that build these clauses carefully will usually document the reasoning behind the rate uplift, since an unexplained or disproportionate charge is the type most likely to be challenged as an unenforceable penalty rather than a genuine pre-estimate of loss.

From the borrower's side, a useful pitfall to watch for is treating penalty interest as background noise — something bolted onto a loan that will never actually apply. Confusing it with a related charge, such as a breakage cost for exiting early, is another common pitfall; the two arise from different triggers and are priced on different logic, so reading the specific clause that applies to your situation matters more than relying on general assumptions.