What every invoice needs
Include your business name and contact details, the customer's name, a unique invoice number, the invoice date, the due date, a description of what was provided, the amount, and how to pay. If you charge sales tax, show it as a separate line.
Describe the work in terms the customer's accounts team will recognize. Vague lines like services rendered slow approval because the person paying cannot match it to anything.
Send promptly and to the right person
Send the invoice as soon as the work is done, or at the agreed milestone. Each week of delay is a week added to when you are paid. Ask at the start who handles payments and send it directly to that person, not only to the project contact.
Many larger companies have accounts payable portals or require a purchase order number on the invoice. Ask for it up front.
Make paying easy
Add a payment link or accept cards and bank transfer through your invoicing tool. Each extra step, like mailing a check, adds delay. If you accept cards, consider whether to pass on the processing fee, which is allowed in some cases and restricted in others, so check the current rules with your processor.
Put the payment instructions in the same place on every invoice so people learn where to look.
Terms and incentives
State the due date clearly, not only the number of days. Shorter terms usually bring faster payment. For long projects, break billing into stages. For recurring services, use automatic billing with the customer's permission.
Some businesses offer a small early-payment discount. Work out the real cost before offering it. Others add a late fee, which should be written on the contract and invoice in advance.
Automate reminders
Set the software to send a friendly reminder a few days before the due date, on the due date and after. A polite reminder before the date works more than people expect, since many late payments are forgetfulness.
Keep your tone steady and professional. Save personal calls for larger or older balances. Track which customers always pay late and adjust their terms next time.
A short example of the difference
Two freelancers finish similar projects. One sends a plain invoice two weeks later saying design work, with a mailing address for checks. The other sends the invoice the same day, lists the deliverables, includes the purchase order number and a card payment link, and schedules two reminders. The second is usually paid in days. Nothing about the work or the customer changed, only the friction of paying.
Track the results. After a quarter of the new habits, compare average days to payment with the quarter before. If the number has not moved, look at which customers are still slow and whether their invoices go to the right person. Small experiments, such as changing the due date wording or adding a payment link, can be tested on a few customers at a time.
Common questions
Should I invoice before or after the work?
It depends on the agreement. Deposits and milestone invoices before completion protect cash on larger jobs.
Do I need invoice numbers in order?
Sequential numbers make records easier to audit and help spot missing invoices. Avoid reusing numbers.
Can I email invoices as PDFs?
Yes, though a link with online payment is usually faster. Keep a copy in your records either way.
This guide is general information, not tax, legal or accounting advice. Rules, fees and due dates change; check with the IRS, the NJ Division of Taxation or a licensed professional for your situation.