When you're a solo founder, you approve every invoice yourself. As your team grows, that doesn't scale — and neither does a shared inbox. Here's how to build an approval workflow that works at any size.
An invoice approval workflow ensures every purchase is reviewed before it's paid. Without one, invoices can be paid twice, fraudulent invoices slip through, or legitimate expenses get rejected after payment. A good workflow adds a lightweight checkpoint without creating bureaucracy.
Single approver (0–5 employees)
One person reviews all invoices. Works fine at low volume. The key is making this fast — ideally a mobile-friendly queue rather than digging through email.
Rules-based auto-approval (5–20 employees)
Trusted suppliers under a certain amount are approved automatically. Everything else goes to a reviewer. Reduces touchpoints by 70-80% without adding risk.
Multi-tier approval (20+ employees)
Invoices over £X require a second approver. Certain categories (capital expenditure, new suppliers) always need finance team sign-off. Larger organisations may use ERP systems.
Configure auto-approval for trusted suppliers and focus on what matters.
Try InboxBill freeHow to Automate Invoice Processing for Your Small Business
The average small business spends 5–10 hours per month manually processing supplier invoices. That's time spent copy-pasting figures into spreadsheets, chasing down PDFs, and reconciling mistakes. Automation cuts this to minutes.
The True Cost of Manual Invoice Processing
Most small business owners know manual invoice processing is slow. Fewer realise just how expensive it is. When you factor in staff time, late payment fees, reconciliation errors, and audit risk, the numbers are sobering.