The mechanical part of invoicing — which fields go where — is covered in how to make an invoice. This piece is about the other half: the conversation with the client, what you collect before starting work, and what you do when the invoice goes out.
A well-built invoice sent to the wrong person sits in a void for three weeks. A simple invoice sent to the right AP contact, with the right PO number, clears in seven. The logistics matter more than the design.
Before work starts: collect four things
This is where most freelancers lose two weeks. Ask for all of these during intake — before any invoice is needed — and keep them in a client file.
- Legal billing entity name — the exact name on the purchase order or contract, not just the trade name. "Acme Inc." and "Acme Marketing LLC" are different entities and an AP system will flag the wrong one.
- Billing address — often different from the office address. Ask specifically for "the billing address your AP team needs on invoices."
- Accounts-payable contact — the person (or team inbox) that actually processes invoices. Get both their name and email. The person who hired you almost never pays you directly.
- PO number or internal reference — many companies won't pay an invoice without a matching PO on file. If the client uses POs, ask for the number before invoicing. If they don't, ask if there's any internal reference (project code, client ID) that should appear on the invoice.
Ask this once, at the start, in a single short email: "Before I kick off, can I grab your billing entity name, billing address, AP contact email, and any PO or reference number I should put on invoices?" You'll look professional and save a week of follow-up later.
Set payment terms before the work
Payment terms are part of the agreement, not a surprise at invoice time. Cover these in your proposal, engagement email, or statement of work:
- Total fee and schedule — fixed fee, hourly rate with estimated hours, or monthly retainer. Be specific.
- Deposit — for projects over ~$3K, 50% up front is standard. For trust-verified clients you've worked with before, this can be waived.
- Milestone or billing schedule — for multi-month projects, specify when invoices go out (e.g., month-end, on milestone delivery, 25% at each of 4 checkpoints).
- Payment terms — Net 30 default; state the late-fee rate. New clients can get Net 15 if you want tighter cash flow.
- What happens if scope changes — hourly overflow for fixed-fee projects, change-order process for bigger pivots. Saves a fight later.
If these aren't locked before work starts, the first invoice becomes an awkward negotiation. Lock them early and the invoice is a confirmation, not a surprise.
The invoice email (template)
Short, clear, and with the PDF attached. Don't bury the amount in a paragraph of thank-yous.
Why this works: invoice number + project + amount + due date are all in the subject or first line, so the AP team can route it without opening the PDF. CC'ing the project manager creates social proof — they see the AP team received it, which reduces "I didn't get it" pushback later.
Common first-time mistakes
- Sending the invoice to the signer — they didn't hire you to process paperwork. Route to AP; CC the signer for visibility.
- No PO number when the client uses POs — automatic rejection in most enterprise AP systems. Ask for the PO before invoicing.
- Vague line items — "design work — $5,000" gets questioned. "3 logo concepts at $500 + brand guidelines at $2,500 + 2 rounds of revisions at $500" doesn't.
- Starting the invoice number at INV-2026-042 — signals you're pretending to be more established than you are. INV-001 is fine for a first invoice. Clients don't care.
- Discounting the first invoice to "build a relationship" — you set a pricing precedent you'll fight for years. Charge the rate you agreed to. If you want to do a favor, deliver extra value, not a lower number.
- Sending as .docx or .xlsx — both editable, both a risk. AP teams archive PDFs; send PDFs.
- Not logging it in your own books — the moment you send the invoice, record it. A simple sheet (invoice number, client, amount, issue date, due date, paid date) saves you at tax time.
FAQ
Should I invoice before or after the work is done?
Depends on the project size and your client relationship. Small jobs under ~$2K: invoice on completion. Larger projects: 50% deposit up front, 50% on delivery. Multi-month engagements: monthly invoices at month-start, or milestone billing at defined checkpoints. New clients with no payment history: lean toward deposits. Cash flow is the first thing that kills new freelancers — don't wait six weeks to get paid for six weeks of work.
What information do I need from the client before I can send an invoice?
Four things: the exact legal billing entity name (not just the person who hired you — often different from the contact), the billing address, the accounts-payable email, and any PO number or internal reference the client uses. Ask for all four during project intake — before work starts — not after. Waiting until invoice time to collect this creates two weeks of unnecessary back-and-forth.
What payment terms should I use for a first-time client?
Default to Net 30 — that's what corporate clients expect and what their AP systems are set up for. For anything over $3K with a new client, add a 50% deposit requirement. Include the late-fee rate (1.5% monthly is standard) on the invoice. Avoid 'due on receipt' for a first-time client — it reads as pushy and rarely gets paid faster.
How much should I charge for my first invoice?
Charge what the agreement says. The pricing conversation happens before the work, not at invoice time. If you're new to freelancing and unsure what to charge, the freelance rate calculator walks backward from your take-home goal to an hourly or project rate that makes sense given taxes, business costs, and non-billable time. Don't discount your first invoice to 'build a relationship' — it sets a precedent you'll regret.
Should I send the invoice in the same email as a thank-you note?
Short cover note is fine; long thank-you emails with the invoice buried at the bottom are not. AP teams scan for the PDF attachment — keep the email copy focused on what the invoice is for, the amount, the due date, and any PO reference. Save the relationship-building for a separate email.
The client hasn't paid and it's been three weeks — what now?
Send a polite reminder on day 1 after the due date. Day 7: more formal, CC the signer. Day 15: phone call. Day 30: demand letter citing your late-fee terms. Most unpaid invoices are oversight, not refusal — a reminder usually fixes it. If it doesn't, escalation is appropriate; you're not being aggressive, you're enforcing a contract they agreed to.
Keep reading
- · How to make an invoice — required fields, payment terms, and numbering conventions.
- · Invoice vs. receipt vs. bill — the legal difference and when it matters.
- · Freelance rate calculator — figure out what to charge before you quote.
- · Invoice generator — make the invoice you're about to send.