I've reviewed hundreds of freelancer invoices. Here are the mistakes I see constantly — and they're costing you clients.

1. No payment terms. If you don't specify "Net 15" or "Due on receipt," clients will pay whenever they feel like it. Put it on every invoice.

2. Vague line items. "Design work — $500" tells your client nothing. Break it down: "Homepage redesign (3 revisions) — $500." Specificity builds trust.

3. Missing your business details. Your full name, email, and payment info should be on every invoice. Clients shouldn't have to ask how to pay you.

4. Not numbering invoices. INV-001, INV-002 — it takes 2 seconds and makes tax season painless. Your future self will thank you.

5. Sending PDFs without a follow-up. An invoice without a "hey, just sent this over" message gets buried. Always follow up.

Most of these come down to not having a proper template. I built a starter pack with professional invoice templates, quote templates, pricing calculators, and stock sheets specifically for freelancers who want to stop winging it.

The details matter. Your clients notice.