The anatomy of a payable invoice

An invoice is a payment request with a paper trail. To be processed without questions, it needs: the word Invoice and a unique number; your legal business name, address and contact; the client's name and address; an issue date and a due date; itemized lines (description, quantity, rate, amount); subtotal, discount, tax and total; the amount already paid and balance due; and clear payment instructions.

Numbering that scales

Start anywhere sensible (INV-1001 is common) and never reuse a number. Sequential numbers make missing payments visible at a glance and keep your bookkeeping — and your accountant — happy at tax time.

Payment terms, decoded

Net 30 means payment is due 30 days after the invoice date; Net 15 and Net 7 are common for freelancers. Due on receipt sounds firm but is vague in practice — a real date gets paid sooner. Many small businesses also add a late fee line (“1.5% per month on overdue balances”); even if you rarely charge it, its presence speeds up payment. Offering a small early-payment discount (“2/10 Net 30” — 2% off if paid in 10 days) is a classic B2B practice.

Tax, handled simply

If your work is taxable in your state, show the tax as its own line with the rate — never bury it inside prices. Keep your tax ID/EIN on file for clients who ask for a W-9 (most US businesses will, before paying you $600 or more in a year). Sales-tax rules differ by state and by whether you sell goods or services; one short call to your state tax office prevents the classic mistakes.

Send it like a professional

Send the invoice the day the work is delivered (or on the agreed schedule), as a PDF attached to a short, friendly email that repeats the total and due date in plain text. Name the file clearly — BrightStudio-Invoice-1001.pdf — because your client's accounts-payable folder holds hundreds of files named “invoice.pdf”. Then track it: unpaid at the due date, send the polite reminder the next morning (templates are on this site).

Mistakes that delay payment

No due date. Math errors. Billing the wrong entity name (ask for the client's legal name and AP contact before you start). Sending to your day-to-day contact instead of accounts payable. And the quiet killer: waiting two weeks to send the invoice at all.