Chase overdue invoices automatically with Gmail and Google Sheets

Automatically emails customers reminders about overdue invoices, getting firmer over time, so you get paid without chasing.

How the work actually flows

A straight line. Runs once per each overdue invoice.

Pattern: Sequence (1) ยท Multiple Instances without Synchronization (12)

flowchart TD trig(["daily overdue invoice check"]):::trigtime s0[["identify overdue invoices"]]:::mi s1["review email history with client"]:::task s2["draft tone-matched reminder"]:::task s3["send and log reminder"]:::task trig --> s0 s0 --> s1 s1 --> s2 s2 --> s3 out[/"reminder email sent per invoice"/]:::out pay{{"get paid without awkward chasing"}}:::pay s3 --> out out --> pay classDef task fill:#e7f6fe,stroke:#34b8f0,color:#2c2a29 classDef svc fill:#f6f8fa,stroke:#7c8795,color:#2c2a29 classDef mi fill:#e7f6fe,stroke:#0079a8,color:#2c2a29,stroke-width:2px classDef human fill:#fff,stroke:#0079a8,color:#0079a8 classDef store fill:#f6f8fa,stroke:#0079a8,color:#2c2a29 classDef trig fill:#00a4eb,stroke:#0079a8,color:#fff,font-weight:bold classDef trigtime fill:#00a4eb,stroke:#0079a8,color:#fff,font-weight:bold classDef trigdata fill:#8ad4f5,stroke:#0079a8,color:#06314c,font-weight:bold classDef gate fill:#fff,stroke:#e8a23d,color:#6b4708,font-weight:bold classDef out fill:#1f9d6b,stroke:#167a53,color:#fff,font-weight:bold classDef pay fill:#06314c,stroke:#021f33,color:#fff
Starts itA stepRuns once per itemResultPayoff
Build size
Advanced

A larger build with multiple systems, AI reasoning, and custom rules.

Business functions
Email AutomationImage & Media ProcessingSpreadsheet & Database OpsFinance & Accounting
Connects
GmailGoogle SheetsOpenAI

The problem it solves

Chasing late payments eats up time you don't have, and it's awkward to keep asking the same client for money. You either let invoices slide for months or fire off the same generic reminder that gets ignored.

Who it fits

A small business or agency that invoices clients directly and struggles to collect payment on time.

How it works

  1. Checks your invoice spreadsheet every day for bills that are now 7, 14, 21, or 28 days overdue
  2. Reviews recent Gmail conversations with that client so it never nags right after you've already talked about the invoice
  3. Writes a reminder email in a tone that matches how overdue the invoice is, from polite to firm
  4. Sends the email automatically and logs that a reminder went out
What you get

Overdue invoices that get paid without a call

Customers get a friendly reminder that grows firmer over time, so late invoices get paid without an awkward phone call.

What you get

A personalized reminder email sent to each overdue customer, timed to how late they are.

What you need

A Gmail account, a Google Sheets invoice tracker, and an OpenAI API key.

We can build this. But should you?

The hard question is not how to build it. It is whether this is the right thing to build first.

That is what a Fractional Chief AI Officer figures out with you, before anyone writes a line of code.

Let's Talk Strategy

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