Payment terms are the part of an invoice most likely to be misread, mostly because "Net 30" is shorthand that not everyone interprets the same way. Getting this section right is one of the simplest ways to reduce late payments, since most lateness comes from ambiguity rather than refusal to pay.
"Net 30" means payment is due 30 calendar days after the invoice date — not 30 business days, and not 30 days after the work was delivered if that's a different date. Net 15, Net 45, and Net 60 follow the same logic with a different number of days. The "net" simply refers to the full amount due, as opposed to a discounted early-payment amount (covered below).
Due on receipt means payment is expected immediately when the client receives the invoice. This suits small jobs, one-off work, or clients you don't have an ongoing relationship with yet.
Net 15 is common for freelancers and smaller clients who can turn payments around quickly and don't have a lengthy approval process.
Net 30 is the most widely used term for B2B work, largely because it matches how many companies' accounts payable cycles run.
Net 60 / Net 90 are typically requested by larger clients with slower internal approval chains — these are worth resisting if cash flow is a concern, since they tie up your money for a long stretch.
Some invoices include terms like "2/10 Net 30" — meaning a 2% discount if paid within 10 days, otherwise the full amount is due in 30. This is more common in larger B2B transactions than freelance work, but it's a useful tool if you want to incentivize faster payment without changing your standard terms.
"Net 30" requires the reader to do date math, and date math is where mistakes creep in — especially around month boundaries (a Net 30 invoice dated January 31st is due March 2nd, not February 28th, which trips people up constantly). Writing both — "Net 30 (Due: March 2, 2026)" — removes any chance of miscounting on either side.
If you charge a fee for late payment, state the exact rate (e.g. "1.5% per month on overdue balances") directly on the invoice, not in a separate contract the client might not have in front of them when the due date passes. A late fee that's only mentioned after the fact is much harder to enforce, and can come across as an unexpected penalty rather than a previously agreed term.
The shorter your payment terms, the faster you get paid — but very short terms (like due on receipt) can feel aggressive for an established client relationship, while very long terms (Net 60+) put real strain on freelancers and small businesses who don't have the cash reserves a larger company does. Net 15 or Net 30 is a reasonable default for most freelance and small business invoicing; reserve due-on-receipt for new or one-off clients, and only agree to Net 60+ if a larger client requires it and you've planned your cash flow around the delay.
Re-typing your payment terms on every invoice is exactly the kind of detail that gets forgotten under deadline pressure. Cleanbill's invoice generator lets you set your default terms once and applies them to every invoice you create, while still calculating the literal due date for you from the issue date.
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