Invoicing feels like the easy part of contracting — until the first client goes quiet for three weeks. The fix usually isn't a stronger follow-up email. It's a better invoice, sent at the right moment, with nothing for the client to ask you to clarify.
Step 1: Agree on terms before you start work
The invoice is downstream of the agreement, not a substitute for it. Before the first hour of work, confirm in writing: the rate, whether it's hourly or fixed, when you'll bill (weekly, on completion, at milestones), and how many days the client has to pay once they receive an invoice.
Step 2: Track the work as you go
Reconstructing three weeks of work from memory the night before you invoice is where errors creep in. A simple running note — date, task, time spent — turns invoicing into transcription instead of guesswork.
Step 3: Build the invoice
Every line item should be specific enough that someone outside the project understands what they're paying for. "Website work — $2,400" invites questions. "Homepage redesign, 2 rounds of revisions — 16 hrs @ $150/hr" doesn't.
- List each deliverable or work block on its own line
- Use consistent units — don't mix flat fees and hourly rates on the same invoice without labeling which is which
- Total clearly, with tax broken out separately if you charge it
Step 4: Send it the same day the work is done
Invoices sent promptly get paid faster — not because clients are impatient, but because the work is still fresh in whoever approves it. Waiting a week to "batch" your invoicing just adds a week to your payment cycle.
Step 5: Set a due date, not just terms
"Net 30" requires the client to do the math. A stated due date — "Due by March 14, 2026" — doesn't. Put both if you want to be thorough, but never one without the other.
Build the invoice as you read this
The tool typesets your line items into a clean, ready-to-send PDF in real time.
Step 6: Follow up before the due date, not after
A short note two or three days before the due date — "just confirming this is queued up for payment" — reads as organized, not pushy. It also surfaces problems (a missing PO number, a wrong contact) while there's still time to fix them before the invoice is officially late.
Step 7: Know what to do when a payment is late
If the due date passes, a plain, factual follow-up works better than an apologetic one: restate the invoice number, amount, and original due date, and ask directly whether there's an issue on their end. Save escalation — late fees, pausing work — for a second missed date, not the first.