how to send a professional invoice

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The 10 fields every invoice needs

An invoice is a legal document that asks for money, triggers accounting entries, and records the terms of a sale. A sloppy invoice takes longer to get paid, creates tax problems, and occasionally ends up disputed. This guide walks through every field that should be on a proper invoice, the formatting that gets paid fastest, and the payment-terms tactics that move DSO from 45 days to 18.

Professional formatting rules

PDF, not Word or Google Doc. Lockable, non-editable, consistent rendering.

Payment terms — what to ask for, and what you’ll get

One page. If you need more, summarize line items and attach a detail sheet. Many AP systems cap at one page for auto-routing.

Early-pay discount math (2/10 net 30)

Your logo at the top, small. Professional appearance matters more than you’d think — a logo-less Word doc looks like an individual; a branded PDF looks like a real business that will follow up.

Send-day tactics to get paid faster

Clear font. Arial or a similar sans-serif at 10–11pt for body, 14pt+ for the invoice total. Decorative fonts signal amateur.

What to do when an invoice is overdue

Offering 2% off for payment within 10 days (instead of the full 30-day window) is equivalent to a ~36% annualized discount rate. Steep but it works: many AP teams are incentivized to capture early-pay discounts, and you get paid 20 days sooner.

Late fees — should you include them?

Good tactic when: you need faster cash, you’re billing larger amounts, or your cost of capital (or your line of credit rate) is high.

Tax handling — jurisdictional basics

Bad tactic when: most of your invoices are small, the 2% is meaningful to your margin, or your clients usually pay on time anyway.

Run the numbers

Contract language allowing 1–2% per month late fee on overdue invoices is standard and enforceable. Advantages:

How To Send A Professional İnvoice