7 Types of Invoices Explained: Which One Do You Actually Need?
Learn the 7 types of invoices every freelancer needs — standard, proforma, recurring, credit notes, and more. Free invoice creator at Plainvoice.
Most freelancers send one type of invoice their whole career — but there are actually seven, and each one fits a specific moment in the billing cycle. Use the wrong one and you create confusion; use the right one and payment almost takes care of itself.
This guide covers every invoice type in plain English: what it is, when to send it, and a one-line example. If you are completely new to billing, this plain-English guide to what an invoice actually is is worth reading first.
Quick-Reference: All 7 Types of Invoices at a Glance
| Invoice Type | When to Use | Direction of Money |
|---|---|---|
| Standard / Commercial | After delivering work or goods | Client → You |
| Proforma | Before work starts, as a formal estimate | Client → You (pending agreement) |
| Recurring | Ongoing retainer or repeat fixed-fee billing | Client → You (on schedule) |
| Credit Note / Credit Invoice | To reverse or reduce a previous invoice | You → Client (refund or credit) |
| Interim | Mid-project milestone billing | Client → You (partial payment) |
| Final | Project completion — the closing bill | Client → You (remaining balance) |
| Past-Due / Overdue | Payment deadline has passed | Client → You (overdue) |
Plainvoice handles all of these — free, no account needed. Create any invoice type right now →
1. Standard Invoice (Also Called a Commercial Invoice)
A standard invoice is a formal request for payment sent after you have completed work or delivered a product. It specifies exactly what you did, how much you are charging, and when payment is due — and it is the document that holds up in a payment dispute.
This is the invoice type 99% of clients recognise immediately. It is legally binding the moment the client receives it, which is what separates it from a quote or a proforma.
When a freelancer uses it: Any project with a defined deliverable — a finished website, a copywriting batch, a design handoff, a completed consulting session.
Example: “Invoice #0042 — Brand identity design, 3 logo concepts + final files: $1,200 due in 14 days.”
If you are sending your first invoice as a freelancer, start here. A standard invoice is the default — universally understood, straightforward to create, and exactly what clients expect.
2. Proforma Invoice
A proforma invoice is a preliminary bill issued before work begins. It shows what you plan to charge — not what you have already earned — and it is not a formal payment demand.
Think of it as a formal handshake on price. The client uses it to get internal budget approval or set up a purchase order; you use it to lock in agreed fees before starting a single task.
When a freelancer uses it: When a corporate client needs an official document for their procurement team, or when a client asks for a quote “on letterhead” before signing off on the project.
Example: “Proforma Invoice — Website copywriting, 8 pages × $150 = $1,200. Valid for 30 days.”
A proforma is never a substitute for a real invoice. Once the work is done, follow up with a standard commercial invoice — that is the one the client actually pays against.
3. Recurring Invoice
A recurring invoice is the same bill sent on a predictable schedule — weekly, monthly, or quarterly — for ongoing services at a fixed price. The format stays identical each cycle; only the invoice number and billing date tick forward.
For freelancers, recurring billing transforms unpredictable project income into something closer to a regular paycheck. Retainer clients learn to expect your invoice before it even arrives.
When a freelancer uses it: Monthly social media management, a content retainer, ongoing SEO work — any arrangement where the scope and fee are the same every billing period.
Example: “Monthly retainer — 4 blog posts + editorial strategy: $800, billed on the 1st of each month.”
Pair recurring invoices with clearly defined invoice payment terms — spelling out exactly when payment is due and what happens if it is late stops the “oh, I forgot” cycle before it starts.
4. Credit Note (Also Called a Credit Invoice)
A credit note is the reverse of an invoice — it reduces the amount a client owes you, either to correct an overcharge, cancel a portion of services, or issue a partial refund. It carries a negative monetary value and always references the original invoice number it is adjusting.
Credit notes exist to keep your books clean. Editing or deleting a sent invoice breaks your audit trail and can confuse your client’s accountant. A credit note corrects the record properly.
When a freelancer uses it: You charged $500 for a project but delivered half the agreed scope. Issue a credit note for $250 so the client’s outstanding balance accurately reflects what they actually received.
Example: “Credit Note #CN-007 — Partial cancellation of Invoice #0039: –$250 credit applied to account.”
5. Interim Invoice
An interim invoice bills for a portion of a larger project before it is complete — usually tied to a milestone, a percentage of the total fee, or a defined time period. It lets you collect payment throughout a long engagement rather than waiting until the very end.
For big projects, interim invoices are how freelancers avoid going 60 or 90 days without income while still doing the work.
When a freelancer uses it: A $6,000 brand identity project with a 30/30/40 payment structure — you would send three invoices tied to discovery completion, concept approval, and final delivery.
Example: “Interim Invoice #2 — Milestone 2: Wireframes approved — $1,800 (30% of total project fee).“
6. Final Invoice
A final invoice closes out a project — it requests the remaining balance after any deposits or interim payments have already been collected. It formally signals that the work is done and the financial relationship for that project is being wrapped up.
A well-structured final invoice shows the total project fee, subtracts all prior payments, and presents the exact balance due. This prevents the “I thought I already paid for this” conversation at the finish line.
When a freelancer uses it: After delivering the last files, completing the final revision round, or hitting the agreed completion milestone when earlier deposits were already collected.
Example: “Final Invoice — Brand identity project: Total $6,000 — Less $3,600 previously paid — Balance due: $2,400.”
7. Past-Due Invoice (Also Called an Overdue Invoice)
A past-due invoice is not a separate format — it is your original standard invoice, resent after the payment deadline has passed, with a clear overdue notice added. Some freelancers include a late-payment fee; others simply flag the balance as overdue and request immediate payment.
The goal is to prompt action without damaging the relationship. A firm, factual reminder almost always works better than an emotional one — and it almost always works faster too.
When a freelancer uses it: Any time a due date passes without payment, typically after at least one gentle reminder email has gone unanswered.
Example: “OVERDUE NOTICE: Invoice #0042 was due June 1. Balance of $1,200 remains unpaid. Please remit payment immediately.”
Knowing how to follow up on an unpaid invoice without torching the client relationship is a skill worth building early. Keep the tone professional, stay factual, and escalate methodically — not emotionally.
Which Invoice Type Do You Actually Need?
For the vast majority of freelance work, the answer is a standard invoice. Here is a quick decision tree for everything else:
- Client needs budget approval before you start? → Proforma invoice
- Monthly retainer or fixed recurring work? → Recurring invoice
- Long project with multiple payment stages? → Interim invoices + final invoice at completion
- Overcharged or need to issue a partial refund? → Credit note
- Payment deadline has passed? → Resend the original as a past-due notice
- Everything else? → Standard invoice
One distinction worth keeping clear in your own records: an invoice is a request for payment, not proof that payment was received. Understanding the difference between an invoice and a receipt keeps your accounting straight — especially when a client asks for “proof of payment” after they have already paid.
Ready to send? Plainvoice creates any of these invoice types — free, no sign-up required →
Frequently Asked Questions
What is a proforma invoice?
A proforma invoice is a preliminary document sent before work begins that outlines the estimated cost of goods or services. Unlike a standard invoice, it is not a legal payment demand — it is a formal quote both parties use to agree on price and scope upfront. Once the work is delivered, you follow up with a real commercial invoice, which is what the client actually pays against.
What is the difference between a credit note and an invoice?
An invoice requests payment from a client; a credit note does the opposite — it reduces the amount the client owes or issues a refund. If you sent an invoice for $500 but the client is owed a $200 discount, you issue a credit note for $200. The credit note always references the original invoice number and carries a negative monetary value. Never edit or delete a sent invoice — always use a credit note to correct the record.
What type of invoice should a freelancer use?
For most one-off projects, a standard (commercial) invoice is all you need — send it after the work is done, include a clear due date, and follow up if it goes unpaid. Use a proforma invoice when a client needs budget sign-off before you start. Use a recurring invoice for monthly retainers. Use interim plus final invoices for long projects with milestone payments. And if a payment goes overdue, resend the original as a past-due notice.
What is the difference between an interim invoice and a final invoice?
An interim invoice bills for part of a project while work is still ongoing — typically tied to a milestone or a percentage of the total fee. A final invoice closes out the project and requests the remaining balance after all prior payments are credited. For a $6,000 project with a 30/30/40 payment schedule, you might send two interim invoices and one final invoice at delivery.
Is a proforma invoice legally binding?
No. A proforma invoice is a preliminary estimate, not a binding payment demand. It becomes the basis for a binding transaction only when both parties agree to terms — usually via a signed contract or statement of work. Always follow a proforma with a proper commercial invoice once the work is complete.
When should I use a recurring invoice?
Use a recurring invoice any time you charge a client the same amount on a regular schedule — monthly content management, a social media retainer, or ongoing SEO services. The format stays identical each cycle; only the invoice number and billing date change. Recurring invoices cut admin time and make your cash flow far more predictable.
Can I edit an invoice I have already sent to a client?
You should not edit or delete a sent invoice — doing so breaks your financial audit trail and can confuse your client’s accounts-payable team. Instead, issue a credit note that cancels or reduces the original amount, then send a corrected invoice if needed. This keeps your records clean and gives both sides a clear, traceable paper trail.