Payment reminders that chase invoices for you
Turn on automatic reminders for overdue invoices and stop being the one who has to notice, and then ask.
Chasing a late payer by hand is awkward. You have to keep track of which invoices are actually overdue, decide how long is too long to wait, and write an email that reads as a nudge instead of a complaint. Then, if it doesn’t get paid, you have to do it again a week later. Most people put it off, which is how a 30-day invoice quietly becomes 60.
SendBilling does the noticing and the asking. Set a reminder rule once, and every invoice on that rule follows up on its own the moment it's overdue — with wording you wrote, sent from an address that looks like you sent it.
That matters most for the invoices you're least likely to chase: the small one you forgot about, the client you don't want to bother, the one from three weeks ago that's slipped off your radar entirely. A reminder rule doesn't forget, and it doesn't feel awkward sending the same follow-up twice — it just does the job the same way, every time, until the invoice is paid.
How it works
No dashboard to babysit. Set the rule once and the reminder sends itself when an invoice crosses the line — the same flow runs whether it's one invoice or a hundred.
1. Invoice sent
Due in 14 days
2. Due date passes
Still unpaid
3. Reminder sends
On your schedule
4. Client pays
No email from you
Reminder: Invoice #1042 is now overdue
Hi Jordan — just a friendly note that invoice #1042 for $1,200.00 was due on Jul 4 and hasn’t been marked paid yet. You can view and pay it here whenever works for you.
An invoice goes out with its due date attached. If the due date passes and the invoice is still marked unpaid, SendBilling checks it against your reminder rules and sends the first match. Mark the invoice paid at any point and the reminders stop — there's nothing to cancel by hand.
What you get
Automatic overdue reminders
Turn reminders on once and forget about them. When an invoice passes its due date unpaid, SendBilling sends the reminder for you — you don’t have to notice it’s late first.
Your own schedule and cadence
Set reminders to fire a set number of days before or after the due date, and stack more than one — a friendly nudge a few days out, a firmer one a week overdue.
Sent from your own email
Connect your own SMTP server in Settings → Email sending and reminders go out from your address, not a “sent via SendBilling” footer. Leave it blank and we send on your behalf instead.
Templates you control
Edit the subject and body for every reminder, drop in placeholders for the client name, invoice number, amount, and due date, and preview exactly what a client will receive before it ever sends.
Pairs well with
Build a reminder sequence around real exceptions
A useful reminder process is consistent but not blind. Dates can trigger messages automatically, while disputes, missing purchase orders, changed contacts, or promised payment dates still require human review.
Before the due date
Use a short courtesy reminder that repeats the invoice number, due date, balance, and contact route for questions without assuming payment is late.
On or after the due date
State that the record remains unpaid, provide the document link, and ask the customer to share a payment reference if funds were already sent.
Escalation
Change the recipient or tone only according to the relationship and agreement. Avoid repeated automated messages when an approver or dispute owner is already engaged.
Stop conditions
Pause reminders when payment is verified, a credit is issued, the invoice is corrected, the debt is disputed, or the sender agrees to a new date.
Late fees and collection wording can be regulated. Do not add a fee or threaten an action that was not agreed and is not permitted where the parties operate.
Read the unpaid-invoice guidePayment reminder questions
How do automatic payment reminders work?
In Settings → Reminders, add a rule such as “3 days after the due date” for invoices, estimates, or retainers. Once an invoice matching that rule goes unpaid past its due date, SendBilling sends the reminder email automatically — no one has to remember to send it.
Can I write my own reminder wording?
Yes. Edit the subject and body under the Emails tab, and insert placeholders for things like the client’s name, invoice number, amount due, and due date so each reminder is filled in automatically. Preview the rendered email against a real invoice before you turn it on.
Is this feature free right now?
Yes. SendBilling is in early access, so scheduled reminders, custom schedules, and your own SMTP sending are all free and unlimited on every plan. Paid tiers launch later with the same features plus priority support.
Stop chasing invoices by hand.
Set a reminder schedule once, free on every plan during early access. See all the free tools on the features page or check the pricing page for what launches later.
Updated July 2026