How to Send an Invoice That Really Gets Paid

The work is done, the client’s happy, and now there’s just one small thing standing between you and getting paid: knowing how to send an invoice properly. For something so simple, it trips up a surprising number of freelancers. 

There’s the first-timer’s flinch — am I really allowed just to email someone and ask for money? 

There’s the invoice that goes to the wrong person and quietly dies in an inbox no one checks. And there’s the one with a subject line so vague the client swears they never saw it, so three weeks later you’re still unpaid and too polite to say anything.

Thing is, getting paid rarely falls apart because of the work itself. It falls apart at the last step — a careless send, a fuzzy email, a follow-up that never happens. Which is good news, because that step is completely within your control.

Sending an invoice is a simple, repeatable routine, and once you have it down, it takes about five minutes. 

Do it well, and you give yourself the best chance of being paid quickly; do it carelessly, and you can end up chasing for weeks. 

This guide walks through the whole thing: the step-by-step process, the three ways to send an invoice, exactly what to write in the email (with copy-paste templates), when to send, and how to follow up on a late payment without the awkwardness.

How to send an invoice, step by step

To send an invoice, create it with all the required details, save it as a PDF, write a short covering email with a clear subject line, send it to the right person as soon as the work is done, log it, and follow up if it isn’t paid by the due date. 

Seven steps, and after a couple of times they become automatic.

1. Create the invoice. Build it in a template, a document, or invoicing software, with every required field filled in (the full checklist is below). If you don’t have a template yet, our free Google Sheets invoice template covers everything you need.
2. Double-check the details. The three things that cause the most grief: the amount, the due date, and the recipient. Read them once more before anything gets sent.
3. Save it as a PDF. A PDF looks professional and, crucially, is much harder to alter. Never send an invoice as a live Word or Google Docs file.
4. Write the covering email. A clear subject line and a short, friendly body — the exact wording is in its own section below.
5. Send it to the correct person. Not always your day-to-day contact; larger clients route invoices to an accounts or finance inbox. Check first.
6. Log it. Note the invoice number, client, amount, and due date somewhere — a tracker or your invoicing tool — so you know what’s outstanding. For US freelancers, the IRS also lists invoices among the supporting documents businesses should keep as part of their records.
7. Follow up if it isn’t paid. If the due date passes, send a reminder. Most late payments are simple oversights that a polite nudge fixes.

The three ways to send an invoice

There are three common ways to send an invoice: email a PDF, use invoicing software, or send a payable invoice through a payment platform. 

Email is the simplest and free; software is best once you’re juggling several clients, and payment platforms get you paid fastest but take a cut. Most freelancers start with email and add a tool as they grow.

Emailing a PDF is where almost everyone begins, and there’s nothing wrong with staying there while your client list is short. 

Once you’re sending the same invoices every month or chasing several at once, software that tracks and reminds automatically starts to earn its keep — more on that at the end. 

Payment platforms are worth adding when speed matters or a client is overseas; just keep an eye on the fees, which can quietly shave a few percent off every payment.

(Tool names and pricing change often — check each provider’s current plans before committing.)

What to put on an invoice so you actually get paid

A payable invoice needs the word “Invoice,” a unique invoice number, your details and the client’s, the issue and due dates, an itemized list of the work with rates, the total due, and clear payment terms and methods. 

Miss one of these and you give the client a reason — or an excuse — to delay.

• The word “Invoice” and a unique invoice number (e.g. 0007). The number matters for your records and your tax return, and it gives you and the client a clean reference to quote.
• Your details: name or business name, contact information, and your tax/VAT number if you have one.
• The client’s details: their name or company and the correct billing contact.
• Issue date and due date. Spell the due date out (“Due 14 August 2026”), not just “Net 14” — leave no room for confusion.
• An itemized list of what you did, with the rate or quantity for each line, so the client can see exactly what they’re paying for.
• The total due, in bold, in its own clear line. This is the one number they’re looking for — make it easy to find.
• Payment terms and methods: how long they have to pay and how to pay it — bank details, a pay link, or whichever methods you accept.

If building this from scratch feels fiddly, start from a ready-made layout — our free Google Sheets invoice template and Google Docs invoice template have every field in place. 

For the edge cases, getting a job approved and priced before you bill for it, or matching a client’s purchase order, see pro forma invoice and purchase order vs invoice. 

What to write in the invoice email

Keep the email short: a subject line with the word “Invoice,” the number, and the project or client, plus a friendly body stating what it’s for, the total, the due date, and how to pay — with the invoice attached as a PDF. 

The email’s job is to make the invoice impossible to miss and effortless to pay.

Start with the subject line, because it’s what determines whether the email gets opened and found again later. Use a simple formula: Invoice #[number] — [project/service] for [client name]. 

For example, “Invoice #0007 — Homepage Design for Brightwave.” Specific and searchable beats “Invoice” or, worse, an empty subject.

Then the body. Here’s a template you can copy and fill in:

Subject: Invoice #0007 — Homepage Design for Brightwave

Hi [Name],

Thanks again for the work on [project] — it's been a pleasure.

Please find attached invoice #0007 for [brief description], totalling
[amount]. Payment is due by [date], and you can pay by [bank transfer /
the pay link below / your preferred method].

Any questions, just reply to this email and I'll sort it out. Thanks!

[Your name]
[Business name / contact details]

For a client you invoice regularly, you can trim it right down:

Hi [Name],

Attached is invoice #0012 for [month/project], totalling [amount], due
[date]. Details are the same as usual. Thanks!

[Your name]

A few things that make the difference: attach the invoice as a PDF, give the file a clear name (Invoice_0007_YourName.pdf, not document(3).pdf), and consider cc’ing yourself so you have a timestamped copy of exactly what you sent.

When should you send an invoice?

Send an invoice as soon as the work is complete, or at the milestone or schedule you agreed up front — the sooner it lands, the sooner you’re paid. 

Invoicing is one of those tasks that feels like it can wait and absolutely shouldn’t; every day you delay is a day added to when the money arrives.

The best time to settle how and when you’ll invoice is before you start the work, not after. Agree your terms up front — Net 14, Net 30, a deposit before you begin — so the invoice is expected rather than a surprise. 

For a one-off project, send the moment it’s delivered. For longer work, bill at agreed milestones so you’re not carrying the whole cost until the end. On a retainer, pick a fixed day each month and stick to it. 

And for a large job, an upfront deposit protects your cash flow. Issue a deposit invoice for the agreed amount, due before you start.

A pro forma is a different document: it sets out what you intend to charge so the client can approve it or raise a purchase order, but it isn’t a payment request in itself. 

See pro forma invoice for when that extra step is worth taking.

And one small thing that helps: send during business hours. An invoice that arrives at 2 am reads slightly differently from one that lands mid-morning on a Tuesday.

How to follow up on an unpaid invoice

Chasing a late invoice is normal business, not rudeness — the client agreed to pay, and a reminder is simply doing your job. 

Follow a simple cadence: a friendly nudge a few days before the due date, a reminder on the due date, then polite follow-ups around 7 and 14 days past, keeping each one short and factual. 

This is the step most freelancers skip out of politeness, and it’s the reason they stay unpaid.

A reminder schedule that works without feeling aggressive:

• A few days before the due date: a gentle heads-up that the invoice is coming due.
• On the due date: a short reminder that payment is due today.
• Around 7 days past due: a polite follow-up noting the invoice is overdue.
• Around 14 days past due: a firmer (still courteous) message asking for a payment date.

Here’s a reminder you can copy for the on-time or just-overdue nudge:

Subject: Reminder — Invoice #0007 (due [date])

Hi [Name],

Just a quick reminder that invoice #0007 for [project], totaling [amount], is due on [date]. I've reattached it here for convenience.

Let me know if you need anything from me to process it. Thanks!

[Your name]

And a firmer version once it’s clearly overdue:

Subject: Overdue — Invoice #0007

Hi [Name],

Invoice #0007 for [amount] was due on [date] and is now [X] days overdue. Could you let me know when I can expect payment, or flag if there's anything holding it up? Happy to help sort out any issues.

Thanks,
[Your name]

Most late payments are honest oversights that one polite reminder clears. If you’d rather never send these by hand, invoicing software does the whole cadence automatically — see invoice automation for freelancers.

Common invoicing mistakes to avoid

The same handful of slip-ups account for most delayed payments:

• Sending to the wrong person. Your project contact isn’t always who pays the bills. Confirm the right recipient before you send.
• A vague or empty subject line. “Invoice” or a blank subject gets lost. Name the number and the project.
• Sending an editable file. A live Word or Docs file can be altered and looks less professional. Always send a PDF.
• No due date or payment terms. “Pay whenever” gets paid whenever. Give a clear date and terms.
• No invoice number. It complicates your records and makes follow-ups messy. Number every invoice.
• Never following up. The single biggest cause of staying unpaid. Build the reminder schedule into your routine.
• Waiting weeks to send. The clock only starts when the invoice lands. Send promptly.

Tools that make sending and chasing invoices easier

While your client list is short, a template and a simple tracker are all you need — our free invoice tracker keeps tabs on what’s outstanding. 

Once you’re sending the same invoices every month and chasing several at a time, software that builds, sends, tracks, and automatically reminds saves real hours and takes the awkward chasing off your plate entirely. 

If you’re ready to move beyond templates, our guide to the best invoicing tool for freelancers compares the strongest options for different needs and budgets.

For how that works and which route suits you, see invoice management system and invoice automation for freelancers. No tool is essential to send an invoice, though — a PDF and a good email will always do the job.

The bottom line

Sending an invoice comes down to a routine: build it with all the right details, save it as a PDF, send a clear email to the right person as soon as the work’s done, and follow up on a schedule if it isn’t paid. 

Get that routine down, and the part of freelancing that feels awkward — asking to be paid — turns into a five-minute admin job you barely think about. 

Grab the free Google Sheets invoice template, and your next invoice can go out in minutes.

Frequently Asked Questions

How do I send an invoice by email?

Create the invoice, save it as a PDF, and attach it to an email with a clear subject line (for example, “Invoice #0007 — [Project] for [Client]”). In the body, briefly state what the invoice is for, the total, the due date, and how to pay, then send it to the client’s correct billing contact.

How do I send an invoice as a freelancer for the first time?

Use a template so nothing’s missing, fill in your details, the client’s details, an invoice number, the itemized work, the total, and the due date, then save it as a PDF and email it with a short covering note. 

Agree your payment terms with the client before you start the work so the invoice is expected.

Should I send an invoice as a PDF or a Word document?

Send it as a PDF. A PDF looks professional and is much harder to alter, whereas a Word or Google Docs file can be changed and appears less polished. Build the invoice in whatever you like, then export it to PDF before sending.

What should an invoice include?

The word “Invoice,” a unique invoice number, your details, the client’s details, the issue and due dates, an itemized list of the work with rates, the total due, and your payment terms and accepted methods. Missing fields are a common reason invoices get queried or delayed.

When should I send an invoice?

As soon as the work is complete, or at the milestone or on the schedule you agreed with the client up front. Sending promptly gets you paid sooner, so don’t let finished invoices sit. For ongoing work, bill at agreed milestones or on a fixed day each month.

How do I follow up on an unpaid invoice?

Send a polite reminder on a schedule: a nudge just before the due date, a reminder on it, then follow-ups around 7 and 14 days past due. 

Keep each message short and factual — most late payments are oversights a friendly reminder resolves. Invoicing software can automate the whole sequence.

Do I need software to send an invoice?

No. You can send a perfectly professional invoice with a template, a PDF, and an email. Software becomes worthwhile once you’re managing several clients or recurring invoices, because it tracks payments and chases them for you automatically.

Related guides: best invoicing tool for freelancers · invoice template google sheets · invoice management system · invoice automation for freelancers · pro forma invoice · purchase order vs invoice