Calculator

Payment Terms Calculator: The Complete Guide

Never miss a due date or an early-payment discount again. Everything you need to know - plus a free tool to do it instantly.

Open the Payment Terms tool

What is payment terms?

Payment terms determine exactly when an invoice is due and whether an early-payment discount is available - but the rules differ by term type, and manually tracking a dozen invoices on different terms gets error-prone fast. Accountdesq's Payment Terms Calculator supports every common trade credit term - Net 15/30/45/60, 2/10 Net 30 style early-payment discounts, End of Month (EOM), 15th of Next Month (proximo), and fully custom terms - and instantly calculates the discount date, due date, days remaining or overdue, and an estimated late fee for as many invoices as you're tracking at once.

How it works

Add each invoice with its date, amount, and payment term (or load sample invoices to see it in action). The tool calculates the exact discount date and amount (if the term includes one), the due date, a visual timeline from invoice date to due date, and a live status - on track, due soon, or overdue with an estimated late fee. A summary at the top totals what's overdue, what's due within 7 days, and how much early-payment discount is still available if you act now. Export the full payment schedule as a PDF or Excel report.

Why it matters

Missing a Net 30 due date damages a customer relationship; missing a 2/10 discount window quietly forfeits what's effectively a very high annualized return for paying 20 days earlier. Tracking every open invoice's terms in one place - with dates already calculated - turns a manual date-math exercise into an at-a-glance action list.

Common mistakes

Miscounting EOM (End of Month) terms - the due date depends on the invoice's month-end, not a fixed number of days after the invoice date
Missing the early-payment discount window because it's tracked separately (or not at all) from the due date
Confusing '2/10 Net 30' as a 2-day or 10% discount, when it actually means 2% off if paid within 10 days
Not accounting for weekends/holidays shifting an effective payment date, even though the stated due date doesn't move

Best practices

Review the 'Due Soon' and 'Discount Available' totals at least weekly to act before windows close
Standardize on one or two payment terms across most customers/vendors to simplify tracking
Always confirm your actual contract's late fee rate - the estimate here is illustrative at 1.5%/month
Use the visual timeline to spot invoices approaching their discount window before it's too late to act

Ready to put this into practice?

Use the free Payment Terms Calculator to create a real payment terms in under a minute - no signup, exports to PDF and Excel.

Open Payment Terms tool