Interest You Are Entitled To and Will Not Charge
Many places give suppliers a right to interest and costs on late payment. Almost nobody claims it, and the reasons are worth being honest about.
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What charging interest is worth against what it costs
Mention the entitlement, charge nothing
Costs you: Little, if it is stated factually
Charge it
Costs you: Usually the next order, whatever any rule permits
Charge it in full
Costs you: Nothing you had not already given up
Include it in the sum claimed
Costs you: Nothing, the relationship having ended already
The entitlement is most usable exactly where the relationship is worth least. That is the honest position, not a complaint about the law. What may be charged differs by jurisdiction and contract; this is one supplier's own practice.
A supplier often has a statutory right to interest on late commercial payments, sometimes with a fixed recovery cost on top, depending on where it trades. Almost no small supplier ever claims it.
The practical point in “Interest You Are Entitled To and Will Not Charge” is that getting paid depends on records somebody can explain. A small team considering download time tracking software for download time tracking software can organise time and project evidence before invoicing, with transparent settings, proportionate collection and a visible correction route.
The reasons are commercial rather than legal, and they are worth being honest about rather than pretending the right does not exist.
The questions raised in “Interest You Are Entitled To and Will Not Charge” can also be checked against Wave invoicing resources. Use the outside resource to identify what evidence and ownership the next action requires.
What such rules typically do
Set a rate, often linked to a base rate plus a margin, and sometimes a fixed sum per invoice toward recovery costs.
What exists where you are, and what it requires, is a question for somebody qualified there.
Why it is not claimed
Because claiming it is read as an escalation, because the sums are small relative to the relationship, and because the supplier expects to want the next order.
All three are real. None of them is a reason the right is useless.
What it is actually for
Deterrence more than recovery. The existence of the right is meant to change behaviour, and for large buyers it largely does not, because suppliers do not invoke it.
Where it does get used
At the end of a relationship, in a formal demand, or where the sum is large enough that the interest is material.
Those are the moments it was designed for.
Mentioning it without charging it
A line on the invoice noting that statutory interest may apply is standard and costs nothing.
It is a statement of fact and is not read as aggression.
Charging it
A separate invoice or a credit-note line, with the calculation shown, after the principal is paid or alongside a formal demand.
Done once, it changes the relationship permanently, which is why it is a decision rather than a routine.
Contractual interest instead
Your own terms may set a rate. Where the buyer's purchase terms govern instead, yours may not apply at all.
Knowing which set governs is the first question, not the rate.
What large buyers do
Many have a policy of refusing interest claims as a matter of course, and some will pay the principal and ignore the interest line.
Pursuing it then costs more than it recovers, which is the usual arithmetic.
When it is worth it
A substantial sum, long overdue, from a customer you do not expect to work for again, usually as part of a formal demand.
In that position it is free money attached to a letter you are sending anyway.
The honest position
The right exists, it is rarely exercised, and the reason is that the supplier is the weaker party and knows it.
Pretending otherwise helps nobody; knowing the right is there, and choosing when to use it, is the realistic version.
What such rules are for
Late payment interest regimes exist in many jurisdictions and are generally framed as a statutory entitlement that does not need to be in the contract, with a rate set by reference to a central bank figure and sometimes a fixed sum for recovery costs.
The details differ everywhere and change, and are a matter for somebody qualified where you are.
What is common to all of them is the intent: to make late payment cost the payer something, so that holding supplier invoices stops being free working capital. Whether it achieves that depends entirely on whether suppliers invoke it, which most do not.
Why the entitlement is not used
A right that cannot be exercised without consequence is not much of a right, and that is the honest position here.
Charging interest to a buyer who holds the next order is a commercial decision about the relationship, not a legal one, and the arithmetic rarely favours it: interest on a thirty-day overrun is a small sum against the value of continued work.
Buyers know this, which is why large organisations routinely pay late without ever being charged.
What remains available is narrower and worth having. The entitlement can be mentioned factually in terms, which costs nothing and occasionally matters. It can be included in a formal demand at the point the relationship is already over, where it adds to the sum claimed. And it can be charged to a customer you have decided not to work for again, which is the only situation where the cost of charging it is zero.
Treating it as a lever available at any time is a misreading. Treating it as a lever available once you have stopped needing the customer is accurate.
What to do now
Find out what applies where you are, put one neutral line about it on your invoices, and decide in advance the circumstances in which you would actually claim it.