To invoice a client, agree the price and payment terms before you begin; send an itemized, numbered invoice as soon as the work (or each agreed stage) is delivered; send it to the person who pays, with a clear due date and payment instructions; and follow up politely on the day after it falls due.
Getting paid on time depends less on the invoice than on what happens before it is sent. This guide covers the whole relationship, from the first conversation to a late payment.
Before the work: agree how you will be paid
Clients rarely object to paying; they object to surprises. Agree these in writing at the start, in a contract, a proposal or an email the client confirms:
- Price and basis: a fixed fee, hourly or daily rates, or unit prices.
- Schedule: when you will invoice (on completion, monthly, at milestones) and any deposit.
- Terms: how long the client has to pay, and any late fee.
- Paperwork: who receives invoices, whether you need a purchase order number, and any supplier forms the client needs from you first.
For a business client, ask the last question early. Large companies often can’t pay a supplier until you are set up in their system, and that can take longer than the work.
Deposits and staged payments
For larger jobs, ask for part of the price up front and invoice the rest in stages. It spreads the risk and keeps cash flowing while you work.
| Job | A common structure |
|---|---|
| Small, quick job | Invoice on completion, due on receipt or within 7–14 days |
| Project over a few weeks | Deposit at the start, balance on completion |
| Longer project | Deposit, then invoices at agreed milestones |
| Construction | Progress billing against the contract’s schedule |
| Ongoing service | Monthly invoices on a fixed date |
On each later invoice, show what has already been paid so the client can see the full picture. Templates for trades, like the contractor template, show the deposit as a deduction automatically.
When the work is done: invoice promptly
Send the invoice the day you deliver. It is when the client is happiest with the work and the details are fresh for both of you. Waiting a week adds a week to your payment and makes the invoice look like an afterthought.
Make it easy to approve:
- Use the client’s own project name and PO number.
- Itemize the work so it matches the agreement line by line.
- State the due date as a date.
- Include every detail needed to pay you.
Invoice
INV-0042
Engagement
Q3 operations review
Amount due
$8,198.40
Due Oct 31, 2026
| Description | Hours | Rate | Amount |
|---|---|---|---|
| Professional fees | |||
| Operations review and analysis | 24 | $225.00 | $5,400.00 |
| Stakeholder interviews, eight sessions | 10 | $225.00 | $2,250.00 |
| Professional fees subtotal | $7,650.00 | ||
| Expenses | |||
| Travel — Boston to Cambridge, two site days | 1 | $486.40 | $486.40 |
| Report printing and binding | 1 | $62.00 | $62.00 |
| Expenses subtotal | $548.40 | ||
- Subtotal
- $8,198.40
- Total USD
- $8,198.40
Notes
Receipts for expenses are attached.
A consultant’s invoice: fees and expenses in separate sections, so the client’s finance team can approve each against its budget. Consultant template
Make paying easy
The fewer steps between reading your invoice and paying it, the sooner you are paid.
- Offer the methods your clients use. Businesses usually pay by bank transfer; individuals often prefer card.
- Give complete details. Account name, bank, account and routing numbers, or a payment link that works.
- Ask for a reference. “Please quote INV-0042” lets you match the payment instantly.
- Send it to the payer. Copy your client contact, but address it to accounts payable.
Following up
On the day after the due date, send a short, friendly reminder with the invoice attached again. Assume there is a simple reason, because there usually is. If there is no reply after a week, write again and ask when payment is scheduled. If a month passes, call. The wording for each is in how to send an invoice.
Keep every message factual: the invoice number, the amount, the original due date and what you are asking for. Don’t stop work on the next stage without telling the client first, and don’t add charges you didn’t agree.
If a client doesn’t pay
If reminders fail, you have options that escalate gradually:
- A final written notice giving a date and saying what will happen next.
- Pausing further work until the account is settled, if your contract allows it.
- Charging late fees or interest that you agreed, or that the law in your country allows.
- A collection agency, or a small claims court for smaller amounts. Rules and limits differ by state and country, so check the ones that apply to you.
Most disputes never get this far, especially when the terms were agreed up front and every invoice was clear.
Keep records
Keep a copy of every invoice, the date you sent it, any reminders, and the date you were paid. They are your income records for tax, and your evidence if a payment is ever disputed. Folio keeps your invoices in your browser and can download a backup of them all.