Side Income
Invoicing, terms and the mechanics of getting paid on time
Late payment is a process problem more often than a client problem, and most of the process is yours.
Everything below about invoicing and payment terms comes from what actually happens rather than from what is supposed to.
What holds up in practice
- Invoices missing a purchase order or reference are frequently rejected without notice.
- Many organisations pay on fixed runs regardless of the date on the invoice.
- Several jurisdictions provide a statutory right to interest on late commercial payment.
Find out how they actually pay
Large organisations typically process supplier payments in scheduled runs, so an invoice arriving a day after a cut-off waits for the next one. Asking at the start of a relationship when the payment runs happen, and what the invoice must contain, is the single highest-value question available.
It converts a vague thirty-day term into a specific date you can plan against. It also identifies whether a purchase order number is required before any work begins.
Invoices are rejected for formatting
A missing reference, wrong entity name, incorrect address or absent purchase order will often cause an invoice to be returned or simply parked. In many organisations nobody tells the supplier, and the first sign is that the money does not arrive.
Where it helps most, confirming the exact required fields once, in writing, prevents this permanently. Sending the invoice to the accounts inbox rather than only to your contact is part of the same fix.
Terms are negotiable at the start
Payment terms are usually treated as fixed and are frequently negotiable before the first engagement, particularly for small suppliers. Shorter terms, staged payments or a deposit are ordinary requests in most sectors.
They are almost impossible to change once a relationship has settled into a pattern. Put the agreed terms in the engagement document rather than only on the invoice.
Chase early and unemotionally
A short, polite message a few days after the due date, addressed to accounts payable with the invoice attached, resolves most late payments. Escalating gradually with a documented sequence is more effective than a single strongly worded message later. Keeping the tone administrative preserves the relationship while making clear the matter is being tracked.
Most delays are internal process failures rather than deliberate withholding.
Statutory remedies exist in some places
Several jurisdictions give commercial suppliers a right to interest and a fixed recovery cost on late payment, applying automatically. Mentioning the applicable provision in a later chase is legitimate and sometimes effective. Whether it exists, and whether it covers your kind of engagement, varies by country.
Put simply, check the position where you are before relying on it, and take advice for anything substantial.
Cashflow is the actual risk
The problem with late payment is not usually the eventual loss but the gap between doing the work and being able to pay your own costs. Deposits, staged payments and shorter terms address that directly in a way that chasing does not. A concentrated client base makes a single late payer an emergency, which is an argument for spreading work.
Where it helps most, where the sums are large or a client stops responding, that is a point for legal advice rather than another email.
The takeaway
Ask when the payment runs happen and exactly what the invoice must contain. Most late payment starts there.
The version you keep doing is the version that works.
Questions readers ask
What should I do first when an invoice is late?
Confirm it was received and accepted by accounts payable, and that it contained the required references. Rejected invoices are frequently never flagged to the supplier.
Can I charge interest on late payment?
Several jurisdictions provide a statutory right for commercial transactions. Check whether it applies to your engagement where you live.
