What goes on an invoice and why it matters
An invoice is a document that tells someone they owe you money and how to pay it. It lists what you sold or what work you did, how much it costs, and when payment is due. The person receiving it uses it to process payment through their accounting system, and you use it to track who owes you what.
Without an invoice, payment often stalls. A business or individual may want to pay you but cannot process it without a document to attach to the payment. If a dispute arises later—you say you invoiced for 10 hours, they say it was 8—the invoice is your proof of what was agreed.
An invoice is not a receipt. A receipt proves payment already happened. An invoice asks for payment to happen.
Key Takeaways
- An invoice must include your name and contact details, the other person's name, a description of what you are charging for, the amount due, and a due date.
- Number your invoices sequentially so you can track them, and keep a copy for your records before you send it.
- Payment terms like "Net 30" (payment due in 30 days) should be stated clearly on the invoice so there is no confusion about when you expect the money.
- You can create an invoice in a spreadsheet, use free templates online, or use invoicing software if you send many invoices.
- Send the invoice as soon as the work is done or the product is delivered, not weeks later, because payment delays compound.
The required information on every invoice
Start with your details at the top: your full name or business name, your address, phone number, and email. If you have a business license number or tax ID, include it. The person paying you needs to know who they are paying and how to reach you if questions come up.
Next, add the other person's details: their name, company name if applicable, and mailing address. This is the bill-to section. If the payment is going to a different address, add a ship-to or pay-to section below it.
Give the invoice a number. Start with 001 and go up from there. This number is how you track the invoice in your records and how the payer references it when they send payment. Write the date you created the invoice and the date payment is due.
In the main section, describe what you are charging for. If you sold a product, name it and say how many. If you provided a service, describe the work and the dates you did it. Add the price per unit or per hour, the quantity, and the total for that line. If there are multiple items or services, list each one separately. At the bottom, add up all the lines to get a subtotal, then add tax if it applies, and show the final amount due.
How to set payment terms and due dates
Payment terms tell the other person when you expect the money. The most common term is Net 30, which means payment is due 30 days from the invoice date. Net 15 means 15 days. Net 60 means 60 days. If you need payment right away, use Net 0 or Due on Receipt.
Write the payment term clearly on the invoice so there is no argument later about when you expected to be paid. If you have not discussed terms with the person beforehand, Net 30 is a safe default for business-to-business work. For personal services or one-time sales, Due on Receipt is more common.
If payment is late, some invoices include a late fee—for example, 1.5% per month on the unpaid balance. Check your state's rules on late fees before you add one; some states cap how much you can charge. Write the late fee policy on the invoice if you plan to use it.
Where to include payment instructions
Tell the payer exactly how to send you money. List every method you accept: bank transfer (and provide your account details), check (and your mailing address), PayPal, Venmo, or credit card. The easier you make it to pay, the faster you get paid.
For bank transfers, include your routing number and account number, or a payment app link. For checks, write "Make checks payable to [your name]" and give a mailing address. If you use an invoicing platform like Square Invoices or Wave, you can embed a payment button directly in the invoice so the payer clicks and pays without leaving the document.
Some payers—especially businesses—need a specific reference to attach to their payment. Ask them in advance if they have a purchase order number or cost center code, and add it to the invoice. This makes their accounting department's job easier and speeds up payment.
Tools for creating invoices
If you send one or two invoices a year, a spreadsheet or word processor works fine. Open a blank document, create a table with your information and the payer's information, list the items or services, and calculate the total. Save it as a PDF before you send it so the formatting does not change on the other end.
If you send invoices regularly, use a free template. Search "free invoice template" and download one that matches your style. Most templates are already formatted with sections for your details, the payer's details, line items, and totals. Fill in the blanks, save it, and send it.
If you send many invoices or want to track payments automatically, use invoicing software. Wave, Square Invoices, and Zoho Invoice are free or low-cost options. They let you create invoices quickly, send them by email, track which ones have been paid, and send automatic reminders when payment is late. Some also integrate with your bank account so you see payments come in without manual entry.
When and how to send your invoice
Send the invoice as soon as the work is done or the product is delivered. Do not wait a week or a month. The sooner the payer receives it, the sooner they can process it, and the sooner you get paid. If you wait, they may forget what the invoice is for, or they may assume you are not in a hurry.
Email is the standard method. Attach the invoice as a PDF or send a link if you are using invoicing software. Write a short message: "Hi [name], attached is the invoice for [description of work]. Payment is due by [date]. Let me know if you have questions." Keep it professional but brief.
If the payer is a business, ask for the email address of the person who handles payments—usually in accounting or accounts payable. Sending it to the wrong person delays everything. If you do not know who that is, call and ask.
Keep a copy of every invoice you send. Save it in a folder on your computer or in your invoicing software. If a payment is late or disputed, you will need to refer back to the original invoice to prove what was agreed.
What to do if payment is late
If the due date passes and you have not received payment, send a reminder. Wait three to five days after the due date, then email the payer: "Hi [name], I wanted to check in on invoice [number] dated [date], which was due on [date]. Could you let me know the status? Thanks." Keep it friendly and assume it was an oversight.
If another week passes with no response, send a second reminder and ask for a specific date when they will pay. If they still do not respond or say they cannot pay, you have a few options. You can offer a payment plan—for example, half now and half in two weeks. You can ask them to pay by a specific method that is faster, like bank transfer instead of check. Or you can stop working with them until the invoice is paid.
If the amount is small and the relationship is not worth the hassle, you may decide to write it off. If the amount is large or the payer is a business, you can pursue it through small claims court or hire a collection agency, though both cost money and take time. The best prevention is to discuss payment terms before you start the work and to invoice immediately when it is done.
Frequently Asked Questions
Do I need to include my tax ID or business license number on an invoice?
If you are a sole proprietor or freelancer, you do not have to. If you are a registered business or LLC, check your state's rules—some require it on invoices. If the payer is a business, they may ask for it for their records. It is safer to include it if you have one.
What if the payer says they never received the invoice?
This happens often with email. Resend it and ask them to confirm they received it. If you are sending to a business email, it may have gone to spam. Ask for an alternative email address or offer to print and mail it. If you use invoicing software, you can see whether they opened the email, which proves delivery.
Can I charge interest or a late fee if payment is overdue?
You can, but check your state's rules first. Most states allow late fees of 1% to 2% per month on the unpaid balance, but some cap it lower or ban it for certain types of transactions. Write the late fee policy on the invoice before you send it so the payer knows it exists.
Should I invoice before or after the work is done?
Invoice after the work is done or the product is delivered. Invoicing before completion can confuse the payer about whether they owe you now or later. The only exception is if you require a deposit upfront—in that case, send a separate invoice for the deposit before you start, then send the final invoice when the work is complete.
What if I need payment faster than Net 30?
Discuss it with the payer before you start. If they agree to Net 15 or Net 0, write it on the invoice. You can also offer a small discount for early payment—for example, "2% discount if paid within 10 days"—to encourage faster payment. For urgent situations, ask if they can pay by bank transfer or credit card instead of check, since those clear faster.