How to write an invoice that gets paid on time

You did the work. The brand loved it. And now it’s been five weeks and your invoice is sitting somewhere in an accounts payable inbox.

Late payments are one of the most frustrating parts of freelance and creator work, and a lot of them come down to the invoice itself: a missing PO number, no due date, sent to the wrong person, or terms nobody agreed to upfront.

The fix is boring but it works: a clear invoice, terms agreed before you start, and a follow-up routine you don’t have to think about. Here’s all of it, including templates.

Quick note: this is general info, not legal advice. Payment and late-fee rules vary by state.

Agree on terms before you do the work

The invoice should never be the first time a client hears your payment terms. Put them in your contract or written agreement: the price, the deposit, when payment is due, how they’ll pay, and what happens if they’re late. Then your invoice just repeats what everyone already signed.

If you’re not sure what to look for in a brand contract, read our guide to contract clauses you need to understand.

Some places require this in writing. New York City’s Freelance Isn’t Free Act, for example, says contracts worth $800 or more must be in writing and must spell out the work, the pay, and the date you get paid. If no date is set, the hiring party must pay within 30 days after you finish the work. New York State added its own Freelance Isn’t Free Act in 2024. Check whether your city or state has something similar.

What every invoice needs

• Your info: name or business name, email, and mailing address if they ask for one.
• Their info: company name, billing contact, and billing email. Ask who handles payments, since it’s often not the person you worked with.
• Invoice number: unique and in order (for example, 2026-014). Accounting teams need it, and so does your own bookkeeping.
• PO number, if they gave you one. At bigger companies, an invoice without a purchase order number can get stuck or rejected.
• Invoice date and due date. Write the actual due date, not just “net 30.”
• What you did: deliverables, campaign name, and dates. Specific enough that someone who wasn’t on the project can approve it.
• Line items and total: price per item, any add-ons like usage rights, subtotal, deposit already paid, and balance due.
• How to pay: the payment methods you accept and the details they need.
• Terms and late fee: repeated from your agreement.

One more thing: many US businesses ask for a Form W-9 before they’ll pay a new contractor. Send it with your first invoice so it doesn’t become the reason for a delay.

Payment terms: pick one and state it

• Due on receipt: payment is due as soon as they get the invoice. Good for small jobs and individual clients.
• Net 15: due 15 days after the invoice date. A reasonable default for small businesses and creators.
• Net 30: due 30 days after the invoice date. Common with companies.
• Net 45, 60 or longer: some big brands and agencies have long standard terms set by their finance teams. You can try to negotiate them down before signing, and if you can’t, at least you know when to expect the money and can budget for it.

Ask for a deposit

For new clients or bigger projects, ask for part of the fee upfront. Many freelancers ask for somewhere in the 25–50% range as a rule of thumb. Send the deposit as its own invoice, and start work once it clears.

A deposit protects your time, and it filters out clients who were never going to pay. A serious client will usually say yes without much fuss.

State your late fee upfront

A late fee only works if it was agreed to in advance. Put it in your contract and repeat it on every invoice. Sample wording:

Payment is due within 15 days of the invoice date. Balances unpaid after the due date are subject to a late fee of [X]% per month.

Some freelancers use a flat fee instead, like a set dollar amount per week late. Some states limit how much interest or how big a fee you can charge, so keep it reasonable and check your state’s rules. Honestly, the main job of a late fee is to signal that you take due dates seriously. You may choose to waive it for a good client who’s a few days late.

Sample invoice layout

INVOICE

[Your Name or Business Name]
[Email] | [Mailing address]

Bill to:
[Company Name]
Attn: [Billing Contact], [Billing Email]

Invoice #: 2026-014
PO #: [if provided]
Invoice date: October 1, 2026
Due date: October 16, 2026 (Net 15)

Description                                   Amount
--------------------------------------------------------
1 TikTok video, [Campaign Name], posted 9/28    $600
Usage rights, organic, 30 days                  $150
3 Instagram Stories, posted 9/29                $250
--------------------------------------------------------
Subtotal                                       $1,000
Deposit received 9/15                           -$500
BALANCE DUE                                      $500

Payment methods: [bank transfer / payment link / check]
Late fee: [X]% per month on balances unpaid after the due date,
per our agreement dated [date].

Thank you!

Send it as a PDF, with a clear subject line like “Invoice 2026-014 from [Your Name], due Oct 16.” Send it to the billing contact and CC the person you worked with.

Make paying you easy

The fewer steps it takes, the faster you get paid. Offer at least two payment methods, include a payment link if you use one, and double-check your bank or payment details before you hit send. If their accounts team needs you to submit through a vendor portal, do it right away, since that’s often where invoices stall.

Follow-up email templates

Set reminders for these the day you send the invoice. Keep the tone friendly and matter-of-fact. Most late payments are disorganization, not bad intent.

1 day late

Subject: Quick reminder: Invoice 2026-014 due yesterday

Hi [Name],

Just a friendly reminder that invoice 2026-014 for [project]
was due yesterday, [date]. I've attached it again here.

Could you let me know when I can expect payment? And if it
should go to someone else on your team, I'm happy to send it
their way.

Thanks so much,
[Your Name]

7 days late

Subject: Following up: Invoice 2026-014, now 7 days past due

Hi [Name],

Following up on invoice 2026-014 for [project], which was due
on [date] and is now a week past due. The balance is $[amount].

Can you confirm the payment date, or let me know if anything is
holding it up on your end? I've attached the invoice and my W-9
in case they're needed.

Thanks,
[Your Name]

14 days late

Subject: Invoice 2026-014: 14 days past due

Hi [Name],

Invoice 2026-014 for [project] is now 14 days past due. Per our
agreement dated [date], a late fee of [X]% per month applies to
balances unpaid after the due date.

Please send payment of $[amount] by [specific date, about a week
out]. I'll need to pause any new work until this is resolved.

If there's an issue with the invoice, reply here and I'll sort
it out right away.

Thank you,
[Your Name]

If they still don’t pay

• Pause new work for that client until you’re paid.
• Go around the inbox. Call, or email their accounts payable team directly.
• Send a final written notice with a firm deadline and a clear next step.
• Look into small claims court for smaller amounts. Limits and filing rules vary by state.
• Check local freelancer protections. If you’re covered by a law like New York City’s, you may be able to file a complaint with the city.

Then learn from it. Next time, that client (or any new client) pays a bigger deposit upfront.

Keep a copy of everything

Your invoices are part of your business records. The IRS lists invoices among the records that support your income, so save every one along with proof of payment.

Your getting-paid checklist

• Payment terms, deposit and late fee agreed in writing before you start
• Deposit invoiced and paid before work begins on bigger projects
• Invoice with a number, PO number, real due date and clear line items
• Sent as a PDF to the billing contact, with a W-9 for new clients
• Follow-up reminders set for 1, 7 and 14 days after the due date
• Paid invoices saved with proof of payment

Getting paid on time makes everything else easier, from pricing your next brand deal to budgeting when your income swings.