Invoice Payment Terms Explained: Net 7, Net 15, Net 30 and More

Payment terms are the agreement about when money is due — and they are where most late-payment arguments actually begin, not end. A client who agreed to Net 30 and paid on day 45 did not break an unclear rule by accident; the rule was never quite written down. This guide is about doing that part properly.

What payment terms actually cover

The term itself is one number: how many days after the invoice date the client has to pay. Around that number sits everything else the agreement needs — when invoicing starts, what happens with deposits, and what you will do if the date passes. Written together, they form a small contract that rides along on every document you send.

Terms are set at the start of a relationship, in the quote or the first agreement. An invoice is the wrong place to introduce them for the first time, because by then the work is done and your leverage is spent.

The standard ladder

Term	What it means	Where it fits
Due on receipt	Payable immediately on receipt of the invoice	Small amounts, new clients, retail-style work
Net 7	Payment due 7 calendar days after the invoice date	Fast work for other small businesses; deposit balances
Net 15	Due 15 days after the invoice date	The practical middle for freelancers and small teams
Net 30	Due 30 days after the invoice date	Established business clients whose payment runs work monthly
Net 45 / Net 60	Due 45 or 60 days after the invoice date	Large organisations — expect to ask, not to be offered
Deposit plus balance	A percentage up front, the rest on one of the terms above	Projects with material costs or real delivery risk

The line between Net 15 and Net 30 is not about trust, it is about mechanics: monthly payment runs exist on 30-day cycles, and a 15-day term on a monthly-run client effectively becomes 30 anyway. Choose the term the client's actual process can honour, then hold them to it.

Picking terms without guessing

New client, real cost of delivery: ask for a deposit, whatever the term on the balance. Deposits are a cash-flow instrument, not a verdict on the client.
Small jobs for individuals: shorter than you think — Net 7 reads as reasonable for a job that took a day.
Repeat work for a big customer: match their cycle rather than fighting it, and price the wait into your planning.
Overseas clients: agree the term in writing and pick the currency for the document at the same time, because "30 days" across borders comes with bank timing you do not control.

Worked example: one invoice, three due dates

Here is why the exact calendar date — not just the term — belongs on the invoice. Say you issue a document dated 28 October 2026, and the client's accounts team applies whichever convention they happen to use:

Convention the client applies	The date they will pay	What that means for you
Net 30 from the invoice date	27 November 2026	The plain reading — and the one to write down explicitly
End of month of the invoice	31 October 2026	Faster than Net 30; fine, but only if it is actually agreed
End of the following month	30 November 2026	Three days later than Net 30 — the difference between two "standard" readings

Same work, same client, three plausible dates. The cure costs one line: next to the total, print the term and its exact landing date — "Net 30 — due 27 November 2026". Nobody has to convert anything, and the conversation about the 30th versus the 27th never happens.

Writing terms so there is nothing to interpret

Name the term and the date together, in the block the client reads first — not only in the terms note at the bottom.
State that days are calendar days, since "days" quietly invites the working-days misreading.
Say what happens when the date lands on a weekend or public holiday — the sensible convention is the next business day, written down once.
If you charge interest on overdue amounts, describe it as plainly as you intend to apply it.
Point back to the agreement: one clause such as "as per quote QUO-0012" ties the invoice to the terms the client actually accepted.

Once the date passes

Terms only matter if the follow-up treats them as real. A short, factual sequence — a note the day after the due date, a call once it is a week late — does most of the work, and the guide to getting paid faster sets out that schedule in detail. What matters here is the framing: by the time you are chasing, you are enforcing terms the client already accepted, not asking for a favour.

Where the term meets the document

In FreeInvoices, payment terms are a choice on the document itself: pick the term and the due date is calculated onto the invoice, exactly the way the worked example above prefers it. Quotes carry a valid-until date instead, and when a quote converts into its invoice, the terms you agreed travel with it — so the dates on the final document are a continuation of the agreement, not a fresh proposal.

Frequently asked questions

Can I change payment terms halfway through a project?

Treat it as a new agreement rather than a moving target: propose the change, get it acknowledged in writing, and apply it to documents issued after that point. Quietly shortening terms on an invoice restarts every trust question you spent the project earning.

What if a client simply ignores the terms?

Assume a process problem before assuming bad faith, ask directly what their payment cycle is, and then decide whether the relationship is worth the wait. If it is not, move to a deposit-plus-balance structure for future work rather than re-litigating the past.

Does "Net 30" count working days or calendar days?

The plain reading is calendar days, which is why writing the exact date removes the question entirely. If your agreement genuinely means business days, that has to be said in words — never left to convention.

Choose a term on the document and let the editor calculate the due date beside the total — terms, dates and totals that agree with each other by construction.

Set terms on an invoice