How to Send an Invoice

The job is done. The client looks happy. You’re standing in their driveway, tools loaded back in the truck, and the only thing left is the part that actually pays you: sending the bill.

So what do you do? Text the invoice right there from your phone? Email it tonight after dinner? Hand them a printed copy on the spot? That decision — the send step — does more to determine how fast you get paid than almost anything else in the job.

Most advice on how to send an invoice stops at “attach the PDF and hit send.” But the channel you choose, the timing, and the few words you write around it all move the needle. Here’s how to send an invoice the right way by email, by text, and in person — and how to stop guessing whether it ever landed.

Send it the moment the job is done

Timing is the single biggest lever on when you get paid. The longer the gap between finishing the work and sending the bill, the harder it gets to collect.

The numbers back this up. Only 36% of U.S. invoices are paid on time, and roughly 55% are paid after the due date (Atradius via DocuClipper). On average, U.S. small businesses see payments land about 8 days past the agreed deadline. Automation widens the gap further: only 6% of manual invoices get paid within 30 days, compared to 33% of automated ones (gennai.io).

The fix is a habit, not a feature: send the invoice the same day, ideally before you leave. While the work is fresh in the client’s mind and they’re still happy, paying feels easy. A week later, your invoice is one more thing buried in their inbox.

If you can send before you pull out of the driveway, do it. Everything below assumes you’ve got a clean invoice ready to go on your phone.

How to send an invoice by email

Email is the default for a reason. It’s the right call for first-time clients, corporate or accounts-payable contacts, and any formal industry where a paper trail matters.

A good invoice email has three parts: a clear subject line, a short body, and an easy way to pay.

Subject line. Make it scannable so it survives a crowded inbox. A simple formula works:

[Your business] Invoice #[number] — [short job description] — Due [date]

For example: Okafor Plumbing Invoice #1042 — Water heater replacement — Due July 5. Personalized, specific subject lines pull 50% higher open rates (Robly), and the average marketing email already opens at around 32.55% (Constant Contact, Aug 2024). An invoice your client is expecting will do even better.

Body. Keep it to three or four sentences. Say what the job was, the amount due, the due date, and how they can pay. Skip the long greeting. Something like: Thanks again for having me out today. Your invoice for the water heater replacement is attached — $640, due July 5. You can pay by card using the link in the invoice, or let me know if you’d rather pay another way.

Attachment vs. payment link. A PDF attachment is the standard, and you should include one so the client has a record. But if you want faster collection, lead with a payment link. A link lets them pay in two taps instead of digging out a checkbook. (More on that in Get Paid Faster With Payment Links.)

Did they get it? This is the part email handles badly. Read receipts are unreliable and most clients never confirm. If you’ve ever emailed an invoice from your truck at night and had no idea the next morning whether it even opened, you know the problem. With Pronto Invoice, you can see exactly when your client views the invoice — so “I never got it” stops being a mystery you can’t check.

How to send an invoice by text

For repeat clients who already text you, trade customers, and mobile-first relationships, a text often beats an email. People read texts. Text messages run a 10–20% click-through rate versus 2–4% for email (Influize), and 86% of consumers are opted in to receive texts from businesses in 2026 (SimpleTexting). If your client texted you to book the job, texting the invoice meets them where they already are.

Keep the text short. One or two sentences plus a link is plenty: Hi Dana, thanks for today! Here’s your invoice for the panel repair — $310. You can pay right here: [link].

Two rules make text invoicing work:

• Don’t send a screenshot of the invoice. Send a link to a proper PDF or payment page. A screenshot looks sloppy, can’t be paid from, and is a pain to save.
• Mind the tone. Some contractors worry texting an invoice feels unprofessional. It isn’t — as long as the link goes to a clean, branded invoice. The channel is not the invoice. A professional link to a professional document reads as professional, whatever delivers it.

One caveat: text is best for clients you already have a relationship with. Only 35% of consumers like receiving marketing texts, and 76% prefer email from brands (Influize). A surprise text to a brand-new corporate client can land wrong. Match the channel to the client.

Handing an invoice in person

The most underused way to get paid same-day is the one right in front of you: the client is standing there. Use it.

Pull the invoice up on your phone, show them the total, and ask the question that gets you paid: Want to take care of this now, or should I email it to you?

If they want to pay right now, make it effortless. Hand them a payment link, use tap-to-pay or a card reader, or take Venmo or another mobile method — whatever you’ve got set up. (See Mobile Payment Methods for Small Business for options.)

If they’d rather pay later, lock in a commitment before you leave: No problem — I’ll email it to you right now. Does Friday work for payment? That turns a vague “I’ll get to it” into a date you can follow up on.

A printed invoice is still fine for older clients or anyone who expects paper. But pulling it up digitally on your phone is faster, and it’s the only version you can track after you drive off.

What to double-check before you hit send

Roughly 39% of all invoices contain at least one error (DocuClipper / gennai.io). That’s more than one in three. A disputed invoice delays payment far longer than a slightly late one ever would, so take ten seconds before you send.

Run the checklist:

• Client name and address are correct
• Invoice number is present and unique
• Date and due date are right
• The work is itemized clearly
• Amounts and totals add up
• Payment terms are stated
• At least one easy payment method is included

Catching a wrong total before you send beats explaining it after. For more on getting the layout right, see How to Format an Invoice Properly and Invoice Payment Terms Examples.

Following up when the invoice isn’t paid

Sending is half the job. Following up is the other half — and most contractors hate it because it feels awkward.

A simple cadence removes the guesswork: a friendly nudge 3–5 days before the due date, a reminder the day it’s due, and a firmer one about a week after if it’s still open. Keep each message short and easy: Hi Sam, just checking in on Invoice #123, due July 5. Happy to take payment by phone if that’s easier.

This is where automation earns its keep. Set reminders once and they go out on schedule — never awkward, never forgotten, no mental note to “remember to text them Thursday.” That’s the whole pitch of Automated Invoice Reminders That Work, and it’s a big part of how you get customers to pay invoices faster.

After two or three reminders with no response, change channels. A quick phone call almost always beats a fourth email. If a client keeps going quiet, How to Handle Late-Paying Clients walks through next steps.

Get paid before you leave the driveway

The best way to send an invoice is the one you actually do — right away, on the channel your client already uses, with an easy way to pay and a clear date for follow-up. Email for formal and first-time clients. Text for repeat and trade customers. In person whenever you’re standing there and can ask for payment on the spot.

With Pronto Invoice, you can send by email or text in two taps and see exactly when your client opens it — so you’re never guessing whether the invoice landed. Start sending invoices free at prontoinvoice.com.