What this document is
An invoice is the document that asks for money. It lists what you supplied, how much is owed, when it is due, and exactly how to pay it. A vague invoice invites slow payment and questions; a clear one leaves the client with no reason to delay and no excuse to say they did not understand the amount or the deadline.
A good invoice is also a record. If a payment is late, the invoice is the reference point for a reminder or a demand. If you are keeping books or reporting tax, it is the primary evidence that the work was billed.
When to use it
- You have completed work, or reached a milestone, and it is time to be paid.
- You took a deposit and need to bill the balance on delivery.
- A client needs a formal document with an amount and due date for their own payment process.
- You bill regularly and want consistent, numbered records for your accounts.
When not to use it
- You have received the money and now need proof of payment — issue a payment receipt instead.
- You are ordering from a supplier rather than billing a client — that is a purchase order.
- Nothing has been agreed yet — send a quotation first, not an invoice.
Information you will need
- Your name or business name, contact details, and tax ID if you use one
- The client's name and billing details
- A unique invoice number and the invoice date
- A line-by-line description of the work or items, with quantities and amounts
- The subtotal, any tax, and the total due with currency
- The payment due date and accepted payment methods with account details
- Reference to any deposit already paid and the remaining balance
Clauses included
Supplier and client details
Identifies who is billing and who owes, with contact and tax details where relevant.
Invoice number and date
A unique reference and date so the invoice can be tracked, paid, and reconciled.
Line items
Describes each service or item, quantity, and price, so the total is transparent.
Totals and tax
Shows the subtotal, any applicable tax, and the final amount due.
Deposit and balance
Credits any deposit already paid and states the remaining balance due.
Due date and late terms
Sets when payment is due and any agreed late-payment terms.
Payment details
Gives the account number, wallet, or link so the client can pay without asking.
What the guided builder asks
- 1PartiesWho is providing the money?
- 2AmountHow much is being provided?
- 3RepaymentWill it be repaid once or in installments?
- 4InterestWill interest apply?
- 5Late paymentWhat happens if a payment is late?
- 6Additional termsAdditional terms (optional)
- 7ReviewClauses included
- 8ExportExport PDF · Export DOCX
How to sign it
Invoices are not usually signed — they are issued. Send it as a PDF so the amounts cannot be altered accidentally, and keep a copy with its number for your records.
If a client disputes an invoice, the underlying agreement, quotation, or delivery confirmation is what supports it, so keep those together.
Common mistakes
- Leaving off a due date, so 'I'll pay soon' stretches into months.
- Reusing invoice numbers or skipping them, which makes tracking and accounting messy.
- Not stating the payment method and account, forcing the client to ask and delaying payment.
- Forgetting to credit a deposit already paid, then over-charging the client.
- Sending an editable file that could be altered instead of a fixed PDF.
Frequently asked questions
Does an invoice prove I was paid?
No. An invoice requests payment; it does not confirm it. Once the client pays, issue a payment receipt or final payment confirmation as proof the money arrived.
Do I need a tax ID on my invoice?
It depends on your country and whether you are registered for tax. If you are, including your tax ID is usually required. If you are not registered, a plain invoice with your details is generally fine — check local rules for your situation.
What payment terms should I set?
Common terms are due on receipt, 7 days, or 15 days. Shorter terms get you paid faster; whatever you choose, state it plainly and match what your agreement or quotation promised.
What if the invoice is not paid on time?
Send a friendly payment reminder first, referencing the invoice number and due date. If it stays unpaid, a firmer notice or final demand is the next step. Our guide on writing a payment reminder walks through it.
Can I charge late fees?
Only if it was agreed beforehand, in your contract or on earlier invoices, and within what local law allows. Adding a surprise late fee to an overdue invoice is hard to enforce.
This template provides general document assistance and is not a substitute for legal advice. Legal requirements vary by jurisdiction, transaction type, and individual circumstances.