Invoice Early-payment Terms Calculator

How to use Invoice Early-payment Terms Calculator

Forgoing discount d finances the discounted amount at a period fraction d/(1−d). Multiply by the explicitly chosen year basis divided by the extra days to obtain a simple annual equivalent, not APR or APY.

1. Enter invoice face amount, early discount fraction, discount deadline day, net due day.
2. Choose the stated convention and check the units and supported model.
3. Calculate, inspect the result, then copy or download it.

Good to know

• Positive invoice, discount fraction0–1 excluding1, whole discount/net days0–3650 with net later than discount. No credit recommendation or legal interpretation of payment terms.
• Runs locally. Text/JSON fields are capped at30,000 characters; stricter page-specific and numeric-string limits also apply. Numeric inputs are bounded to magnitude1e15 and nonzero magnitude at least1e-100 unless an exact-string mode states otherwise. Approximate summaries use12 significant digits; CSV numeric cells retain the complete stored value and potentially formula-like string cells gain a protective apostrophe; unsupported, non-finite or detected underflow states return an error.
• Educational user-assumption arithmetic only. No live prices, laws, tax rules, quotes or financial advice.