How to send an invoice: a step-by-step beginner's guide
June 11, 2026 · 6 min read · By Charles Ugo
invoice
Finished a job and not sure how to ask for payment? Sending an invoice is the professional way to do it — and it is simpler than it looks. This guide walks through every step: what to put on the invoice, how to format it, how to email it, and what to do when payment is late.
What goes on an invoice (before you send anything)
You cannot send an invoice you have not built yet. Every invoice needs these fields:
| Field | What to put there |
|---|---|
| Your name / business name | Your legal name or registered business name |
| Your contact info | Email and phone or address |
| Client name + contact | Who you are billing |
| Invoice number | A unique reference (e.g., INV-001). Never reuse a number, even for a voided invoice. |
| Invoice date | The day you are issuing the bill |
| Due date | When payment must arrive (e.g., Net 15 = 15 days from invoice date) |
| Line items | One row per service or product, with quantity, rate, and line total |
| Total amount due | The bold number the client looks for first |
| Payment terms | How you accept payment and any late-fee policy |
Worked example — freelance copywriter: Maya wrote three product descriptions for a skincare brand. Her invoice reads:
| Description | Qty | Rate | Total |
|---|---|---|---|
| Product description, 150 words | 3 | $75 | $225 |
| Rush delivery fee | 1 | $25 | $25 |
| Total due | $250 |
Payment terms: Net 15. She sends it as a PDF the same evening she delivers the files.
Need a full walkthrough on building the document? See How to write an invoice for beginners. Want to understand what all the fields mean visually? See What does an invoice look like?.
The IRS recommends keeping records that support your business income, and your sent invoices are exactly that — so save a copy of every one you send. (General information, not tax advice.)
Choose your format: template vs. generator
You do not need to design from scratch.
Free invoice generator — the fastest option for beginners. Fill in the fields online and download a clean PDF in minutes. Try the invoicepdf.io invoice generator — no account required.
Google Docs template — good when you want a reusable file you can duplicate. The free invoice template for Google Docs keeps your branding consistent across every client.
Accounting software (Wave, FreshBooks, QuickBooks) — worth exploring once you are sending more than 10–15 invoices a month. Overkill for a beginner with one or two clients.
Whatever you use, save the final version as a PDF before sending. PDFs preserve your formatting on every device and cannot be accidentally edited by the recipient.
How to send an invoice by email
Email is how most freelancers and small businesses send invoices. Here is the formula:
Subject line: Invoice #[number] — [Your Name] — [brief project description]
Example: Invoice #007 — Maya Chen — Product Descriptions
Body: Keep it short. Three to four sentences is enough.
Subject: Invoice #007 — Maya Chen — Product Descriptions
Hi Jordan,
Attached is Invoice #007 for the three product descriptions delivered on June 10.
Total due: $250 by June 25 (Net 15).
Let me know if you have any questions. Thanks again for the work!
Maya
Attachment: PDF only. Never paste the invoice as an image in the body of the email — it is hard to save and looks unprofessional.
Tip: Use your regular email client (Gmail, Outlook) unless you are sending through a platform like PayPal. Prefer a platform? See the walkthrough on how to send an invoice on PayPal.
What to do when payment is late
Late payments happen. A clear follow-up process keeps things professional.
Day 1 after due date: Send a short, friendly reminder referencing the invoice number and amount.
Subject: Quick follow-up — Invoice #007 ($250 due June 25)
Hi Jordan,
Just a quick note — Invoice #007 for $250 was due yesterday.
Let me know if anything is needed from my end.
Maya
5–7 days after due date: Follow up again, slightly more direct. Confirm the payment details are correct and ask if there is a specific issue.
Two weeks or more overdue: Consider adding a late-fee clause to your next contract, and evaluate whether to pause new work until the balance is cleared.
What to avoid: Do not ghost the situation or assume it will sort itself out. Polite persistence is the most effective tool.
Common invoicing mistakes (and how to fix them)
| Mistake | Why it matters | Fix |
|---|---|---|
| No due date | Clients treat it as optional | Always set a specific due date |
| Vague line items | Invites disputes | Describe each item specifically |
| Waiting days to send | Delays your payment clock | Send within 24 hours of delivery |
| No follow-up plan | Late payments drag on | Schedule reminders at 1 day and 7 days past due |
| Reusing invoice numbers | Creates confusion in your records | Assign a new unique number every time |
Frequently Asked Questions
How soon should I send an invoice after finishing a job?
Send it the same day or within 24 hours. The faster you send it, the fresher the work is in your client's mind and the sooner payment starts its clock.
What are standard payment terms for a freelancer?
Due on Receipt, Net 15, and Net 30 are the most common. Net 30 means payment is due 30 days from the invoice date — not the 30th of the month. Pick terms that match how quickly you need cash flow. For a deeper look, see what does Net 30 mean on an invoice.
What if a client is late paying me?
Send a short, friendly reminder the day after the due date. If there is still no response after another 5–7 days, follow up again and reference the invoice number. Keep a polite but firm tone throughout.
Can I ask for a deposit before I start work?
Yes. Many freelancers request 25–50% upfront with the balance due on delivery. State this on the invoice and in your contract so there is no confusion.
Do I need accounting software to send invoices?
No. A free template or an online invoice generator is enough for most beginners. Accounting software is worth it once invoice volume grows, but it is not required to get started.