Does Invoice Ninja Send Automatic Payment Reminders?

You finish a project, send the invoice from Invoice Ninja, and the due date slides past without a word. Now the money sits in limbo, and the job of nudging your client lands back on you. Writing that follow-up email is nobody's favorite part of running a business — it takes time you don't have, and it always feels a little awkward, no matter how politely you phrase it.

If Invoice Ninja is your billing tool, you've probably wondered whether it can take that chore off your plate. It's a fair question. The platform is known for doing a lot on a small budget, but its reminder features live a few menus deep, and it isn't obvious from the invoice screen what the software will and won't do on its own once a client goes quiet.

The good news: yes, Invoice Ninja can send automatic payment reminders. This post walks through exactly how the feature works, how to set it up step by step, the settings that quietly stop reminders from sending, what the built-in emails do well, and where you may want more than three templated nudges.

The Short Answer: Yes, Up to Three Automatic Reminders

Invoice Ninja includes a built-in reminder system that emails your clients about unpaid invoices on a schedule you define. According to Invoice Ninja's official documentation, you can configure up to three reminder emails, each with its own timing, its own subject line and message, and an optional late fee. Once configured, the reminders run on their own — you don't have to remember anything or click anything for each invoice.

That makes Invoice Ninja more capable out of the box than several better-known competitors. But the system comes with conditions: reminders only fire on invoices in the right status, only for clients with reminders switched on, and only three times. Each of those details trips up real users, so let's go through them.

How Invoice Ninja's Payment Reminders Work

Reminders live under Settings, then Templates & Reminders, in the Advanced Settings area. There you'll find slots for a first, second, and third reminder. Each slot has three parts you control.

First, the schedule. You choose when each reminder goes out relative to either the invoice date or the due date — for example, three days before the due date, seven days after it, and thirty days after it. Sending one nudge before the deadline and two after is a popular pattern, because a gentle heads-up often prevents the invoice from going overdue at all.

Second, the message. Every reminder has its own editable subject line and body, so the tone can escalate gradually: a friendly note first, a firmer follow-up later. The templates support variables for the client name, invoice number, balance, and a payment link, so each email arrives with the details filled in.

Third, the enable switch. Each reminder must be individually enabled before it will send. A schedule that's filled in but not enabled does nothing — a detail that catches plenty of people on their first setup.

Setting Up Automatic Reminders, Step by Step

The whole setup takes about ten minutes. Here's the path:

Open Settings and choose Templates & Reminders under Advanced Settings.
Select First Reminder. Set the schedule — the number of days, and whether that counts before or after the invoice or due date.
Edit the subject and body so it sounds like you, then tick Enable.
Repeat for the second and third reminders, spacing them out — many businesses use something like 7 and 21 days past due.
Optionally add a late fee to a reminder, as a flat amount or a percentage of the balance.
Check each client you invoice has Send Reminders enabled on their client record.

From then on, any invoice you email or mark as sent will follow that schedule automatically until it's paid.

The Fine Print: When Reminders Won't Send

Most complaints about Invoice Ninja reminders "not working" come down to one of four quiet conditions rather than a bug.

The client has reminders turned off. Reminders only fire for clients whose record has Send Reminders enabled. If one client has a special arrangement and the setting was switched off, their overdue invoices won't trigger anything — including late fees — even though every other client gets nudged on schedule.

The invoice is still a draft. Draft invoices are invisible to the client and to the reminder system. The countdown only starts once an invoice is emailed or marked as sent. If you delivered a PDF some other way and never marked the invoice sent, no reminder will ever go out for it.

There's no due date. If you leave the due date blank, the invoice is treated as due immediately, and it won't be considered overdue in the way the reminder schedule expects. A concrete due date gives your before-due and after-due reminders a fixed point to count from — and gives your client a specific date to act on, which works better than vague urgency. If you're unsure what terms to set, our post on how Zoho Books handles the same reminder question shows how another tool treats these defaults, and the differences are instructive.

You self-host and the scheduler isn't running. Invoice Ninja is popular as a self-hosted app, and on your own server the reminder emails depend on the background scheduler being configured. If the cron job isn't set up correctly, everything else can look perfect while nothing ever sends. Hosted accounts don't have this problem.

Late Fees: The Optional Extra Push

Each reminder can add a late fee to the invoice — either a flat amount or a percentage of what's outstanding. The fee appears as a new line item, so the client sees exactly what changed and why. Some business owners swear by a modest fee on the second or third reminder; others skip fees entirely to keep relationships smooth and let the reminder emails do the work. Invoice Ninja leaves the choice to you, and applies whatever you pick consistently across every overdue invoice.

Where the Built-In Reminders Fall Short

For a free and open-source tool, Invoice Ninja's reminder system is generous. Still, three scheduled emails have natural limits, and it helps to know them before you rely on the system completely.

The sequence ends at three. After the third reminder, the software goes quiet. A client who has ignored three emails simply stops hearing from you unless you step back in manually — and those are precisely the invoices that need the most attention.

Every client gets the same message. The templates are fixed per reminder slot, not per client. Your biggest account and a brand-new customer receive identical wording at identical intervals. There's no way to soften the tone for a long-term relationship or firm it up for a repeat late payer without editing settings globally.

Templated emails start to feel templated. Clients recognize automated system emails, and messages that arrive from a billing platform's template are easier to ignore than a note that reads like a person wrote it. Reminder fatigue is real, and identical phrasing every time speeds it up.

No sense of the conversation. If a client replies saying they'll pay Friday, Invoice Ninja doesn't know. The third reminder will still fire on schedule, which can land as tone-deaf right after a friendly exchange.

Making Automated Follow-Up Feel Human

None of these limits mean you should abandon Invoice Ninja's reminders — they're a solid safety net, and turning them on is one of the fastest wins available in the app. The question is what to layer on top for the invoices that slip through: the client on their fourth week overdue, the account that deserves a personal touch, the reply that changes the plan.

A dedicated reminder layer such as DueDrop works alongside your existing invoicing tool and focuses purely on the follow-up: friendly, personalized messages that read like you wrote them, sent on a cadence that keeps going past reminder number three. You keep invoicing exactly where you do today; the follow-up simply stops sounding like a template. And for the messages you'd rather send yourself, our guide to following up when an invoice is a week overdue has scripts you can borrow today.

Frequently Asked Questions

How many automatic reminders can Invoice Ninja send per invoice?

Three. Invoice Ninja provides first, second, and third reminder slots, each with its own schedule, subject, and message. After the third reminder is sent, the automated sequence ends and any further follow-up is up to you.

Why are my Invoice Ninja reminders not sending?

Check four things in order: the reminder slots are actually enabled in Templates & Reminders, the client's record has Send Reminders switched on, the invoice was emailed or marked as sent rather than left in draft, and the invoice has a due date. On self-hosted installs, also confirm the background scheduler (cron) is running.

Can I customize the reminder emails?

Yes. Each of the three reminders has an editable subject line and body with variables for the client name, invoice number, balance, and payment link. You can make the first reminder gentle and the third one firmer.

Can Invoice Ninja charge late fees automatically?

Yes. Any reminder can add a flat amount or a percentage of the outstanding balance as a new line item on the invoice. Fees only apply to clients who have reminders enabled, so special arrangements stay untouched.

Do reminders stop once the client pays?

Yes. Reminders track the invoice status, so once an invoice is paid in full it's closed out and no further reminders are sent for it. Partial payments leave the invoice active, and the remaining balance continues through the schedule.

Key Takeaways

Invoice Ninja does send automatic payment reminders — up to three per invoice, configured under Settings > Templates & Reminders.
Each reminder has its own timing (before or after the invoice or due date), editable subject and body, and an optional flat or percentage late fee.
Reminders only fire when the slot is enabled, the client has Send Reminders on, the invoice is sent (not draft), and a due date exists — self-hosted installs also need the scheduler running.
The sequence stops after three emails and every client gets identical templates, so the hardest cases still need a human touch or a dedicated follow-up layer.
Enable a before-due-date reminder — a friendly heads-up often prevents the invoice from ever going overdue.