Invoice Due Date Calculator

"Net 30" and similar payment terms are everywhere on invoices, but the actual due date they imply isn't always obvious at a glance, especially when you're juggling many invoices with different terms. This calculator takes the invoice date and payment term and gives you the exact due date, plus a live status showing whether it's still upcoming, due today, or already overdue.

Standard net terms (15, 30, 45, 60 or 90 days from the invoice date) cover most business arrangements; select custom for anything non-standard your contract specifies. The calculation is a straightforward date addition, but doing it correctly and consistently across dozens of invoices — rather than eyeballing a calendar each time — avoids the easy mistake of chasing payment too early or too late.

Use this when setting up a new customer relationship (agreeing terms upfront and knowing exactly what date that implies), when building a collections follow-up schedule (know precisely when an invoice crosses into overdue territory), or simply to double-check your own or a supplier's stated due date on an invoice.

The status line updates against today's date, so bookmarking this tool and re-checking it periodically for your open invoices is a quick, low-effort way to spot which accounts have quietly slipped into overdue territory before they've been chased — pairing that with the payment reminder generator turns the check into an actual follow-up in under a minute.