Every bookkeeping VA has at least one client who’s “a little late” on invoices. 15 days. Then 30. Then you start feeling awkward about following up because you don’t want to be pushy with someone you have a relationship with. Then 45 days have gone by and you’re three invoices behind.

The three-line email below gets about 80% of those invoices paid within 48 hours of sending it. It’s not magic — it’s the specific structure that works when softer follow-ups have failed.

The email

Subject: Re: Invoice [###]

Hi [Client name],

Quick follow-up — invoice [###] for $[amount] from [date] is showing as [X] days past due on my end. Can you confirm when payment will be sent so I can update the account?

Thanks, [Your name]

That’s it. Three lines of body text. One subject line.

Why each line works

“Quick follow-up” — Signals that this is a routine message, not an emotional escalation. Clients who expect to be yelled at brace for it. When they don’t get it, they’re disarmed. Most overdue invoices resolve not because of pressure but because the client simply forgot; this phrase makes it easy for them to pretend they forgot even if they didn’t.

“invoice [###] for $[amount] from [date]” — Specific. The client can’t pretend not to know which invoice you mean. They can’t say “let me check with my bookkeeper” — you are the bookkeeper. They have to address this specific invoice.

“is showing as [X] days past due on my end” — “On my end” is the critical phrase. It gives the client a graceful out: maybe payment was sent and didn’t arrive. This preserves the relationship while still naming the problem. 90% of the time the payment wasn’t sent, but giving them the possibility of blaming the mail or the bank removes the emotional obstacle to replying.

“Can you confirm when payment will be sent so I can update the account?” — This is the line that converts. Three things happen:

  1. It asks a question that requires a response. Most follow-up emails end with a statement, which the client can ignore. A question sits in their inbox until answered.
  2. It asks for a date, not for payment. The client can commit to a date without immediately having to write a check.
  3. “Update the account” gives the client the impression that you’re organized, on top of your AR, and tracking this. Clients pay organized people faster than they pay disorganized people.

“Thanks” — Not “thanks in advance,” not “thank you so much,” just “thanks.” Matches the low-temperature tone of the rest of the email.

What NOT to include

These are the common additions that tank the conversion rate:

“Just following up on…” — The word “just” is a diminisher. It signals you’re apologizing for sending the email. Don’t apologize for billing.

“I understand things can get busy…” — Also a diminisher. You’re absolving the client of responsibility before they’ve taken responsibility. Don’t.

“Please let me know if there’s anything I can do to help move this along” — This sounds collaborative, but it shifts the problem to you. There isn’t anything you can do — they need to pay the invoice.

“Hope you’re doing well!” — Skippable small talk. The opening small talk is what told the client to ignore your first follow-up; don’t repeat the mistake.

A threat of late fees — Unless your contract has a late fee clause and you’ve actually calculated the fee, don’t threaten it. Empty threats tell the client you’re bluffing on the entire email.

When to send it

Your contract specifies payment terms — typically Net 14 or Net 30. Here’s the cadence that works:

Day 0: Invoice sent.

Day 7 (if Net 14) or Day 15 (if Net 30): Friendly reminder. “Heads up — invoice [###] is due in a week. Let me know if you need anything to process payment.”

Day 14 or 30 (due date): If unpaid, no email yet.

Day 17 or 33 (3 days past due): “Hi [Client], just a note that invoice [###] is 3 days past due. Should be a quick fix — let me know if there’s an issue I can help with.”

Day 24 or 40 (10 days past due): The three-line email above.

Day 38 or 54 (24 days past due): Move to phone call or formal notice per your contract.

Most late invoices resolve at the 10-day-past-due mark. The three-line email is the one that breaks the ice.

The phone call, if it comes to that

If 24 days past due passes without response, the email game is over. Time to pick up the phone.

The phone script:

“Hi [Client], it’s [your name] calling about invoice [###] for [amount]. I’ve sent two emails and haven’t heard back — I wanted to check in and make sure everything’s okay on your end. Is there a reason the invoice hasn’t been paid?”

Three rules for this call:

  1. Do not apologize for calling. You are not calling about something awkward; you are calling about an invoice that is legitimately owed.
  2. Wait for them to explain. The reason matters — “I forgot” is different from “we’re having cash flow issues” and each leads to a different next step. Shut up and let them talk.
  3. Get a specific commitment. “I’ll pay it this week” is too vague. “I’ll send it Friday” is a commitment. Follow up Friday.

When the client never pays

Sometimes the invoice doesn’t get paid. The three-line email works on 80% of late invoices; the 20% are a different category.

The escalation path:

  1. Formal notice letter. Not an email. A physical letter or a certified email through a services like SimplyNoted. “Formal Notice of Overdue Invoice” at the top. Includes the invoice number, amount, date due, and a deadline for payment before the debt is sent to collections.

  2. Termination of services. Per your contract’s termination clause, you stop work until the account is current. Keep all records — you’ll need them.

  3. Small claims court or collections agency if the amount is significant ($2,000+) and the client is responsive but refusing to pay. Small claims is cheap ($50–$100 filing fee in most jurisdictions) and effective against small business owners. Collections agencies take 30–50% of recovered funds but handle it for you.

In practice, moving a client to termination of services recovers about half of the remaining invoices. The rest become writeoffs. You book the bad debt, learn from the red flags you missed in the discovery call, and move on.

The quiet benefit

The three-line email isn’t just about the specific invoice. It’s about you.

Every time you follow up with a professional, unapologetic, specific email, you reinforce to yourself that billing is a normal part of business, not an awkward exception. VAs who dread billing end up with worse financial outcomes than VAs who treat it as routine — because the dread compounds. You avoid one follow-up, then two, then you have $8,000 in AR and you’re afraid to look at it.

Sending the three-line email once breaks that pattern. Do it today if you have an open invoice you’ve been avoiding.

If you want the full invoicing system — late fee clause, termination language, collection letter template, and the email scripts above — the TenKeyOps Email Scripts Pack has all of it in editable form.

Billing is not rude. Working for free is.