Days Overdue Calculator

Count how many days an invoice is overdue from its due date to today — the number you need before chasing or claiming interest.

How it works

Knowing exactly how overdue an invoice is tells you whether to send a gentle nudge, a firm reminder, or — past 45 days for a registered MSME — start claiming interest. Track it per invoice; "roughly a month late" is not a basis for a formal claim.

Frequently asked

When can I start charging interest on a late invoice?: If you’re a registered micro/small enterprise, the MSMED Act allows interest once payment is more than 45 days late. Otherwise it depends on a late-fee clause in your contract.

Retainer shows the days-overdue on every unpaid invoice and turns it into an automatic reminder, so nothing quietly ages past 45 days. Try Retainer free