Automated invoice reminders send payment follow-up messages on a schedule without you logging in, finding the invoice, and manually writing the email. You set up the sequence once, day 7, day 14, day 21, and the system handles it every time an invoice goes unpaid. Most small business invoicing software either has this built in or connects to a tool that does it in under an hour of setup.
This is one of the single highest-value things a service business can automate because the payoff is immediate: faster payment, fewer awkward conversations, and hours back every week.
Why Invoice Follow-Up Is the First Thing Most Small Businesses Should Automate
The average small service business has 15-25% of its outstanding invoices sitting past 30 days at any given time. For a business doing $20,000/month in revenue, that is $3,000-5,000 sitting in limbo. The reason is not that customers refuse to pay. It is that life gets busy on both sides, and nobody is following up consistently.
Most business owners follow up when they remember to. That means some invoices get chased three times in a week and others sit for 60 days without a single nudge. Automation makes the follow-up consistent, which is the main thing that gets invoices paid faster.
A study by FreshBooks found that invoices with automated payment reminders get paid 3 days faster on average than those without. On a 30-day invoice, that is a 10% improvement in your cash cycle, and it costs you nothing after the initial setup.
Option 1: Use the Reminders Built Into Your Invoicing Software
Before you buy anything, check what your existing invoicing software can do. Most of the common platforms have automated reminders built in.
QuickBooks Online: Settings > Sales > Reminders. You can set reminders for before the due date, on the due date, and at intervals after. QuickBooks sends the reminder email automatically. Takes about 10 minutes to configure.
FreshBooks: Invoices > Invoice Settings > Late Payment Reminders. Toggle it on, set the interval, customize the email body. Works the same way.
Wave: Settings > Invoice Reminders. Three reminder templates, each configurable. Free tool, this feature is included.
Xero: Invoices > Invoice Reminders (under Settings). Similar setup.
The limitation with built-in reminders: they are basic. They send the same email template to everyone, they do not adjust based on customer relationship, and they stop when the invoice closes. If you want more control, different messaging for a first-time client vs. a long-term account, or a text instead of an email, you need to layer in a third-party tool.
Option 2: Use Zapier or Make.com to Build a Custom Reminder Sequence
If your invoicing software's built-in reminders are too rigid, or if you want to add SMS reminders (which have much higher open rates than email), you can build a simple automation using Zapier or Make.com.
Here is the basic flow:
- Trigger: Invoice becomes overdue in your invoicing software (QuickBooks, FreshBooks, etc.)
- Step 1: Wait 7 days, then send an email reminder
- Step 2: Wait 7 more days, then send a second email reminder
- Step 3: Wait 7 more days, then send an SMS via Twilio + flag the invoice for a personal call
This takes about 2-4 hours to set up in Zapier if you have never used it before. The cost is about $20/month for Zapier (for low volume) plus $15/month for Twilio if you add SMS.
The SMS step is often worth it on its own. Email reminders get opened about 25% of the time. A text reminder that simply says "Hi [Name], just a reminder that invoice #[number] for $[amount] is past due, you can pay here: [link]" gets read over 90% of the time. For contractors, tradespeople, and anyone who works with clients who are rarely at a desk, SMS reminders outperform email consistently.
Option 3: Let Your CRM Handle It
If you are using a CRM that has payment tracking or can connect to your invoicing software, you can run your reminder sequence from there. Tools like HubSpot, Keap, and GoHighLevel let you build multi-step follow-up sequences that include email, SMS, and task reminders for your team.
The advantage of the CRM approach: you can vary the messaging based on customer type. A first-time customer gets a gentler message. A long-term account might get a shorter, more casual nudge. The sequence is conditional, not just timed.
The setup is more involved, expect 4-8 hours to build this properly, but if you are already using a CRM, it may be the cleaner solution because everything lives in one place.
What Your Reminder Messages Should Say
Most automated reminder emails fail because they are too formal and cold. The goal is to get paid, not to sound like a collections department.
Day 7 (first reminder): Subject: Invoice #[number], just a reminder
"Hi [Name], just following up on invoice #[number] for [amount], due on [date]. If you have any questions about the invoice, reply here and I'll sort it out. Payment link: [link]. Thanks."
Keep it short. No guilt. Just a clear, friendly reminder with a direct link.
Day 14 (second reminder): Subject: Invoice #[number], still outstanding
"Hi [Name], wanted to flag that invoice #[number] for [amount] is now [X] days overdue. If there is an issue with the invoice or timing, let me know and we can work something out. Otherwise, payment link: [link]."
Day 21 (third reminder, escalate personally): At this point, automated messages are usually not the right move. Flag this invoice for a personal call. Your automation can send you a notification or create a task in your CRM. The call should be straightforward: "Hey [Name], I have invoice #[number] sitting at 21 days, want to sort it out today?"
What Not to Do
Do not turn off the automation for "nice" customers. The assumption that a good client will feel insulted by a reminder is almost always wrong. Most people appreciate a reminder, they are busy too. Turn off the automation only for clients who specifically ask you to.
Do not send more than three automated reminders. After three, you are not getting paid through email alone. Pick up the phone.
Do not use the exact same message each time. Vary the subject line and the body. Same subject line three times in a row looks like spam and may get filtered.
Do not send reminders in the first 3 days after the due date for long-term clients. Give a small grace period before the first trigger fires, especially for clients you have worked with for more than a year.