Harvest Invoices: Does It Automatically Remind Clients About Unpaid Bills?

You finished the project, logged every hour, and sent the invoice straight out of Harvest. That part felt good. Three weeks later the money still has not landed, and now you are staring at your own sent folder wondering whether it is your job to say something.

It is a fair question to ask of any billing tool. You already pay for software that tracks your time and turns it into a professional invoice. Expecting it to also watch that invoice after it leaves your outbox, and nudge the client if the due date slides past, is not unreasonable.

Harvest does have an answer here, and it is a genuine one. But the way it is switched on, who it applies to, and what it deliberately leaves alone all matter more than most people realise until an invoice goes quiet. This guide covers exactly what Harvest sends on its own, how to configure it, the setting that trips up nearly everyone, and where you will still need to fill a gap yourself.

The Short Answer: Yes, But Only Once an Invoice Is Late

Harvest can send automatic reminder emails to your clients when an invoice passes its due date. The feature is called late invoice reminder messages, and it is available across Harvest's plans rather than being locked behind the top tier.

Two details matter straight away. First, these are late reminders: Harvest fires them after the due date has passed, not before. Second, they are off by default. An administrator has to turn them on, and that switch does less than you would expect for invoices you have already sent.

So the honest answer is yes, with conditions: Harvest reminds clients about unpaid bills, but only once you set it up, and only for a fairly specific group of invoices. The rest of this article is about getting your invoices into that group.

Where Harvest's Automatic Reminders Live

The default setting sits in one place, and it is not somewhere you would stumble across by accident. In Harvest, an administrator goes to Invoices, then Configure, then Messages, and scrolls down to the Reminder message section. There is a checkbox labelled Automated reminder. Tick it, choose your timing, edit the wording, and save.

Harvest's own documentation walks through this in detail in its guide to late invoice reminder messages, which is worth reading once end to end before you rely on the feature.

A few practical notes on that screen:

Setting the default reminder requires administrator access. Managers with invoicing permissions can still enable and edit reminders on individual invoices, but they cannot change the company-wide default.
The message body supports variables, so you can pull in the invoice amount, issue date, and due date rather than sending wording that says nothing specific.
You can also send a one-off reminder by hand. Open any late invoice and click the Send reminder button in the top left. That is useful when you want to say something particular to one client without changing the rules for everyone.

How the Reminder Schedule Actually Works

Harvest lets you choose two numbers: how many days after the due date the first reminder goes out, and how often reminders repeat after that. The repeat interval counts from the previous reminder, not from the due date, which is the part people tend to get backwards.

Harvest's documentation gives a clean example. Say you set reminders to start three days late and repeat every seven days. An invoice due on the 1st of the month gets its first reminder on the 4th. The second one goes out seven days after that, on the 11th. It carries on at that spacing until the invoice is marked as paid.

That structure suits most service businesses well. A short first gap lets a busy client catch up without feeling chased, and a weekly rhythm afterwards keeps the invoice visible. For more on that timing, see our look at how many reminders to send before you stop.

The Setting That Catches Almost Everyone Out

Here is the detail that causes the most confusion, and it is worth reading twice. When you enable or update the default reminder settings in Harvest, they only apply to invoices sent after that change. They do not reach backwards.

Picture it. You have four invoices sitting unpaid. You switch on automatic reminders, feel a small sense of relief, and move on. Those four will never get a single automatic reminder, because they were already out the door. Only invoice five onwards is covered.

The same logic applies to edits. If you rewrite your reminder message, invoices that already have a reminder scheduled keep the old wording. To update them you have to remove the existing reminder from each invoice and set a new one up, at which point the next reminder reflects your changes.

Fixing the backlog is manual. Open each existing invoice from Invoices, then Overview, click Send reminder, adjust the message and frequency, and confirm. Three unpaid invoices is two minutes of work. Thirty is an afternoon.

Recurring Invoices Need Their Own Setup

Harvest treats recurring invoices as a separate case, and this catches out retainer-based businesses in particular.

If you use free-form recurring invoices that Harvest sends automatically rather than saving as drafts for you to review, reminders have to be configured on each individual recurring template. The company-wide default does not flow down to them. You enable the reminder inside the recurring template's sending settings, and it applies to invoices generated from that point forward.

Five monthly retainers on five templates means five places to check. A small job, but only if you know to do it.

What Harvest's Reminders Do Not Cover

Knowing the boundaries here saves you from assuming a gap is covered when it is not. Harvest's reminders are deliberately narrow:

Nothing before the due date. Harvest only reminds once an invoice is late. A short, friendly note a few days before the money is due is often the single most effective message you can send, and it is not something Harvest will do for you.
The message is a template, not a conversation. Variables let you drop in numbers, but the tone and structure stay the same for every client. A long-standing client who is normally prompt and a client who is habitually three weeks late receive identical wording.
It sends from your invoicing system, not from you. Clients learn to recognise automated billing mail quickly, and a message that looks system-generated is easier to leave sitting in an inbox than a note that reads like it came from a person.
Turning the default off does not switch everything off. Reminders that were enabled or edited on individual invoices, or on recurring templates, keep running until you disable each one.
No follow-up beyond email. If a client does not respond, Harvest has no escalation path. The next move is yours.

A Practical Setup Checklist for Harvest Users

If you want Harvest doing as much as it reasonably can, work through this once and you will not need to revisit it:

Turn on the default automated reminder under Invoices, Configure, Messages, and pick your timing. Three days late with a seven-day repeat is a sensible starting point.
Rewrite the default wording in your own voice. The stock template is fine, but a sentence that sounds like you will read better than one that sounds like software.
Go through every currently unpaid invoice and enable reminders on each one by hand. This is the step that gets skipped, and it is the one that actually recovers money this month.
Open each recurring invoice template and tick the reminder box in its sending settings.
Diarise a check in a fortnight. Look at whether reminders are landing and whether anything has quietly slipped through.

For a wider comparison of how different billing tools handle this, our breakdown of what FreshBooks automates and what it leaves to you covers a tool with a similar shape of limitation, and the same patterns show up in Invoice2go's reminder setup too.

When You Need More Than the Built-In Reminders

For many businesses, Harvest's built-in reminders configured properly are enough. If you send a modest number of invoices and most clients pay within a week or two of the due date, another layer solves a problem you do not have.

The picture changes when late payment stops being occasional. If you are regularly writing follow-ups by hand, if the template wording is clearly not landing with certain clients, or if you want a gentle nudge to go out before the due date rather than after it, you have reached the edge of what the built-in feature was designed to do.

That is the gap a dedicated reminder layer fills. DueDrop sits alongside the invoicing tool you already use, keeps an eye on which invoices are still open, and sends follow-ups that read like they came from you rather than from a billing system, without asking you to move away from Harvest. If you would rather start by tightening what you already have, this guide to automating reminders whatever you invoice with is a good next read.

Frequently Asked Questions

Does Harvest send payment reminders automatically?

Yes. Harvest can send automatic reminder emails once an invoice passes its due date, but the feature is off until an administrator enables it under Invoices, Configure, Messages. It does not run out of the box.

Will enabling reminders affect invoices I have already sent?

No. Harvest applies the default reminder settings only to invoices sent after the setting is enabled or updated. Invoices that were already out the door need reminders enabled on them individually, one at a time, from the Invoices Overview screen.

Can Harvest remind clients before an invoice is due?

No. Harvest's reminders are late reminders, triggered only after the due date has passed. If you want a courtesy nudge a few days before the money is due, you will need to send it yourself or use a separate reminder tool alongside Harvest.

Do recurring invoices get reminders automatically?

Not from the company-wide default. For free-form recurring invoices that Harvest sends automatically, reminders have to be enabled on each individual recurring template in its sending settings.

How do I stop Harvest sending reminders on one specific invoice?

Open the invoice from Invoices, Overview. You will see a small clock icon with a note about emailing the client a reminder. Click Edit reminder, then Remove reminder, and confirm. Disabling the company-wide default on its own will not stop reminders that were enabled directly on an invoice.

The Takeaways

Harvest does send automatic reminders for unpaid invoices, but only after the due date and only once an administrator switches the feature on.
Enabling the default changes nothing for invoices you have already sent. Those need reminders added by hand, invoice by invoice.
Recurring invoice templates are configured separately from the company-wide default.
Reminder timing counts the repeat interval from the previous reminder, not from the due date.
The built-in feature covers the basics. Before-due nudges and wording that adapts to the client are still yours to handle.