Vague payment terms are how a friendly project turns into a waiting room. You said "whenever works." They heard "no rush." You meant the end of the month. They meant after their own client pays them, which might be never. The invoice is not late in their head because nothing in writing ever made it late.
I have watched this movie in reviews, inboxes, and my own early client work. A designer I spoke with had a $4,200 brand job with the words "payment due on completion" and nothing else. Completion, to the client, meant after three extra revision rounds. The money arrived 11 weeks later. The terms were not evil. They were empty.
Clear wording is not aggressive. It is a shared calendar. You name when money moves, what a deposit covers, what a late fee is, and how they can pay. Then you paste the same sentences onto the proposal, the contract, and the invoice so nobody can claim they only saw them at the end.
Write the payment terms
Below are 15-plus examples you can copy. Swap the brackets. Keep the spine. If you want a generator that fills the structure for you, use the Payment Terms Generator. If you are still learning the whole invoice, pair this with how to write an invoice and your first freelance invoice.
The 4 types of payment terms
Almost every freelance and small business invoice uses one of four shapes. Pick the shape that matches the risk, then paste wording that a stranger could understand without a phone call.
Net terms (Net 15, Net 30, Net 60)
Net means the full balance is due that many days after the invoice date. Net 15 is a good freelancer default. Net 30 is common with companies. Net 60 is you financing their business. If a big client insists on Net 60, raise the price or take a deposit so you are not the bank.
Deposit terms (50/50, 30/70)
A deposit is money before you start, or before you start the next phase. 50/50 is simple. 30/70 is gentler for bigger fees. 40/40/20 works when a project has a clear middle milestone. The deposit should be non-refundable for time already blocked, unless you cancelled.
Milestone terms
You invoice when a named chunk of work is done: wireframes, first cut, install, first 10,000 words. Milestones keep a three-month project from becoming one scary bill. Name the milestone in the line item, not only in your head.
Upfront terms
Pay before work, or pay on the day of delivery for small jobs. This is normal for new clients, workshops, rush work, and anyone who has burned you before. Upfront is not rude. Lending unpaid weeks to a stranger is optional.
Net terms wording examples (5 templates)
Put the due date on the invoice as a real date, then keep one of these sentences in the terms block. Codes like Net 30 help accounting software. Humans still need the date.
Payment is due within 15 days of the invoice date (Net 15). The due date on this invoice is [date]. Please include invoice #[number] on the transfer.
Payment is due within 30 days of the invoice date (Net 30). The due date is [date]. If your process needs a purchase order, send the PO number before work continues past this invoice.
Payment is due within 7 days of the invoice date. This timeline applies because the job is under [amount] and was delivered in full on [delivery date].
Payment is due on receipt. Please pay this invoice as soon as it arrives, and no later than [date], which is 5 business days from the invoice date.
Payment is due within 30 days of the invoice date (due [date]). If you pay within 10 days, you may deduct 2% as a prompt-payment discount. After [date], the full amount is due.
I like Net 15 plus a dated due field more than clever discounts. Discounts only help if the client notices them. Dates get processed. If a corporate client cannot do Net 15, keep Net 30 and take a deposit on kickoff so you are not waiting on their entire float.
Deposit terms wording examples (4 templates)
Say what the deposit buys, when the rest is due, and whether unused deposits come back. Silence on refunds is how arguments start after a cancelled kickoff.
A 50% deposit of [deposit amount] is due before work starts. The remaining 50% is due within 15 days of delivery or launch, whichever comes first. The deposit is non-refundable once work has begun.
A 30% deposit of [deposit amount] is due on signing. The remaining 70% is due on [milestone or delivery date], Net 15. Work pauses if the deposit has not cleared.
Billing is split 40% to start, 40% on approval of [middle milestone], and 20% on final files. Each invoice is due within 14 days. Work on the next stage starts after the previous invoice is paid.
A monthly retainer of [amount] is due on the 1st of each month, in advance. Unused hours do not roll over unless we agree in writing. Extra hours are billed on a separate invoice, due Net 15.
If a new client hates deposits, offer a smaller first project that is fully prepaid. Do not skip the deposit on a large first job because they seem nice on Zoom. Nice people still have slow finance teams.
Late fee wording examples (3 templates)
Keep late fees modest and named in advance. One to two percent per month is a common professional range. A flat fee works for small invoices where a percent looks silly. For numbers, use the Late Fee Calculator. For when to actually charge, read how to charge late fees.
Balances unpaid after the due date may accrue a late fee of 1.5% per month (18% per year) on the outstanding amount, calculated from the original due date until paid in full.
If payment is more than 7 days late, a late fee of 2% of the invoice total applies. If payment is more than 30 days late, an additional 2% applies. Fees are only charged if this clause was included before work started.
Invoices unpaid 14 days after the due date may include a late fee of [flat amount]. This fee covers extra admin and payment follow-up. It does not replace the original balance.
Kill fee wording (for creative work)
A kill fee is what you still get if they cancel after you have started. Without it, cancelled projects become free research. Two sentences now save a nasty thread later.
If the client cancels after work has started, a kill fee of 50% of the remaining project fee is due within 14 days, plus payment for any approved extras already delivered. The deposit is credited toward the kill fee.
If the project is cancelled, the client pays for hours already worked at [rate], with a minimum of [amount], invoiced within 7 days of cancellation. Unused deposit after that invoice is refunded within 14 days.
Payment methods accepted wording (2 templates)
Tell them how to pay in the same block as when to pay. Methods that bounce (personal checks on a rush job) should be named as not accepted.
Please pay by bank transfer using the details on this invoice. Card and PayPal are not accepted on this project. Payment is considered received when funds clear, not when a transfer is initiated.
Payment may be made by bank transfer, card link, or the online payment button on this invoice. Cash is not accepted. Card payments may include a [percent] processing fee, shown as a separate line if used.
How to actually use these terms
Where to put them on the invoice
Put a short terms block near the total, not in a footer nobody reads. Repeat the due date in the header. If you use a PDF, keep terms on page one. If you use software, fill the terms field with the same sentences you put in the proposal.
Whether to include them in the contract too
Yes. The invoice reminds. The contract binds. Copy the same deposit, late fee, and pause-work sentences into both. If they only appear on the invoice, a picky client will say the invoice is not the agreement. Give them nothing to pick at.
How to enforce them
Enforcement is a calendar, not a speech. Send the invoice. Send the reminders in how to ask for payment politely. Pause work when the clause says so. Charge the late fee you already named, or waive it once in writing. Do not invent new punishments mid-thread.
If the client still will not pay, stop using friendlier wording and move to the templates in client won't pay. Terms do not collect money by themselves. They make the follow-up boring and defensible.
What Incusia does automatically
You can paste any of these blocks by hand. The failure mode is rewriting them from scratch on every job until one job ships with no due date. A generator and a saved default term stop that. Try the Payment Terms Generator, then reuse the output on every invoice.
Incusia is built so those terms sit on the invoice and the reminder cadence can follow them without you starring the email. If you want that loop instead of a notes file, start at pricing. A free invoice generator is enough for one PDF. Saved terms are what keep the tenth invoice as clear as the first. To turn Net 15 or Net 30 into a calendar date, use the payment due date calculator. For which term to choose in the first place, see Net 30 vs Net 15.