Do I need an invoice if I already sent a contract?

Yes. A contract defines the agreement; an invoice requests payment for work delivered under that agreement. Accounts payable teams process invoices, not contracts. Send both.

What is the difference between an invoice and a receipt?

An invoice requests payment. A receipt confirms payment was received. Send the invoice before or when payment is due; send the receipt after money clears.

Should I charge sales tax on my invoice?

It depends on your jurisdiction, what you sell, and where your client is located. Digital services, physical goods, and B2B sales are treated differently. Consult a tax professional for your situation and show tax as a separate line item when it applies.

How soon should I send an invoice after finishing work?

Within 24–48 hours of delivery or client approval. Waiting until month-end adds 15–30 days to your cash cycle for no reason.

Can I invoice for a deposit before starting work?

Yes. Label it clearly as "Deposit: [project name]" with its own invoice number. Apply the deposit as a credit on the final invoice so the client is not charged twice.

How to Write an Invoice: What to Include and Common Mistakes

A practical guide to writing invoices clients pay faster — the nine required fields, numbering systems, payment terms, a real example, and a copy-paste payment email.

Get Started For Free