How to Automate Invoice Chasing with AI

The Quick Answer

You can automate invoice chasing with an AI agent - Claude Cowork, Perplexity Computer, or Manus - connected to your accounting software. The agent spots overdue invoices, drafts a polite follow-up, and sends it. Each reminder gets a bit firmer. Takes under an hour to set up and saves you 3-5 hours of manual chasing every week.

The key is combining three layers: your accounting software (which knows when invoices are overdue), an automation platform (which orchestrates the workflow), and an AI model (which writes emails that sound human, not robotic). Once configured, you'll spend just minutes reviewing escalations instead of hours chasing individually.

Why Manual Invoice Chasing Fails

Most business owners chase invoices manually. It's awkward. You send one email, nothing happens. You wait a week. You send another, apologising for the repeated contact. It gets deprioritised against client work. Some invoices slip through the cracks altogether.

Manual chasing is inconsistent. You might chase one customer aggressively and another gently, depending on your mood or relationship. Your tone varies. Your timing is erratic. Customers don't take you seriously because they sense the friction.

Worse, it wastes hours. You're checking which invoices are overdue, composing emails, tracking responses, escalating when needed. That's cognitive work that drains energy from building your business.

The Automated Workflow: Step by Step

Here's how a professional automated system works:

1. Trigger: Your accounting software detects an invoice that's overdue by, say, 3 days.
2. AI drafts: The automation platform calls an AI model (OpenAI, Anthropic, or similar) with your customer's name, invoice amount, and due date. The AI writes a brief, polite follow-up email.
3. Send: The system sends the email via your email provider (Gmail, Outlook, or a transactional service like Mailgun).
4. Wait and escalate: After 7 more days with no payment, the system sends a second email with a slightly firmer tone. After 14 days, it escalates further. After 21 days, it alerts you directly because human intervention is needed.
5. Payment received: When the customer pays, your accounting software marks the invoice as paid, and the automation chain stops.

The beauty is consistency and speed. Every customer gets the same sequence. The tone is professional. The timing is predictable. You're alerted only when you need to step in.

What You'll Need

Three layers of technology:

• Accounting software API: Xero, QuickBooks, or Sage must expose an API so you can read invoice data and payment status.
• AI agent: Claude Cowork, Perplexity Computer, or Manus. These handle the logic, scheduling, and email drafting in one place. No flowcharts, no wiring things together.
• AI model: ChatGPT via OpenAI API, Claude via Anthropic API, or similar. You'll pass invoice details to the AI and ask it to draft an email.

You'll also need:

• An email provider that allows sending via API (Mailgun, SendGrid, or your mail server).
• A way to track which emails were sent (logs in your automation platform or a simple spreadsheet pulled from your accounting software).

Example Email Sequence

How This Works with Specific Accounting Software

Xero

Xero has excellent API docs. You can query invoices by status and due date. Claude Cowork and Manus can access Xero directly through computer use, or connect via API. Either way, the agent handles email drafting, scheduling, and escalation in one go.

QuickBooks Online

QuickBooks API is less intuitive than Xero's, but it works. You can filter invoices by due date and status. An AI agent handles the integration and email sequencing without you building separate workflows for each step.

Sage

Sage (Sage Intacct) has a solid API. The setup is slightly more involved, but the workflow is identical: query overdue invoices, trigger AI-drafted emails, escalate over time.

Frequently Asked Questions

Last updated: March 2026 | Back to Guides