Invoice payment terms calculator

Calculate an invoice due date from an issue date and agreed payment terms, then use a visible reminder timeline to plan your handoff. PayFollow runs the calculation in your browser and does not send reminders or track payment status.

Example: an invoice issued on September 13 with 14-day terms is due on September 27. If the dates do not match, review the agreement before sending anything.

How payment terms change the reminder timeline

Start with the issue date and the number of agreed days, then check the result against the wording in your contract or client instructions. A simple planning table can make the next steps visible:

Terms	Example issue date	Example due date	Planning note
Due on receipt	September 13	September 13	Confirm the payment method and send a clear handoff.
Net 14	September 13	September 27	Consider a friendly check-in before or on the due date.
Net 30	September 13	October 13	Use the agreed calendar and watch for month-length changes.

These dates are examples, not a replacement for the agreement. If your terms use business days, a month-end rule, milestone approval, or a different time zone, record that distinction before you send a message.

What the local tool provides

Due-date calculation for 0–365 day terms
Conflict warnings when a manually entered due date differs
Optional expected-payment date as a planning note
Copyable terms sentence and reminder messages

Questions to check before sending

Does “Net 30” always mean 30 calendar days?

Not necessarily. Use the definition in the agreement or the client’s instructions. The calculator helps you test a date from a day count; it does not interpret legal or commercial terms for you.

When should I follow up?

Choose a timing and tone that fit the relationship and the agreed process. The invoice follow-up sequence guide shows a four-stage planning example, and the polite payment reminder guide provides editable wording.

What if my manually entered date differs?

Pause and compare the issue date, term, calendar rule, and any milestone condition. A visible mismatch is a review signal, not proof that either date is correct.

These are drafting aids, not legal, tax, collections, or payment-processing advice. Use the terms you already agreed with your client and review every message yourself.

Open the invoice and follow-up tool →Read the follow-up sequence guide Freelance invoice guide

Privacy: your entries stay in this browser. No account, upload, tracking, or automated sending is involved.