Calculator Inputs
Enter invoice details, payment terms, and discount assumptions. Results appear above this form after you submit.
Example Data Table
| Quantity | Unit Price | Charges | Tax Rate | Terms | Payment Day | Invoice Total | Discount | Payable |
|---|---|---|---|---|---|---|---|---|
| 120 | $45.00 | $150.00 | 7.50% | 2/10, net 30 | 8 | $5,966.25 | $111.00 | $5,855.25 |
Formula Used
Gross Merchandise Value = Quantity × Unit Price
Taxable Amount = Gross Merchandise Value + Additional Charges
Tax Amount = Taxable Amount × Tax Rate
Invoice Total = Gross Merchandise Value + Additional Charges + Tax Amount
Discountable Base = Selected eligible components for discount
Discount Amount = Discountable Base × Cash Discount Rate
Payable Amount = Invoice Total − Discount Amount
Annualized Cost of Skipping Discount = (Discount Rate ÷ (1 − Discount Rate)) × (Annual Basis ÷ (Net Days − Discount Days))
Tax and discount treatment can differ by jurisdiction and contract wording. This calculator uses the options you choose for charges and tax inclusion.
How to Use This Calculator
- Enter quantity and unit price to build the merchandise value.
- Add extra charges and the applicable tax rate.
- Enter discount terms, such as 2% within 10 days and full payment in 30 days.
- Choose whether charges or tax are part of the discount base.
- Set the actual payment day, then calculate to review savings, payable amount, and the cost of missing the discount.
FAQs
1. What is a cash discount?
A cash discount is a price reduction offered for early payment. Terms like 2/10, net 30 mean a 2% discount applies within 10 days; otherwise, the full invoice is due in 30 days.
2. Why does the calculator ask for actual payment day?
The payment day decides whether the discount is still valid. It also helps compare the amount paid today with the amount due later under normal credit terms.
3. What does annualized cost of skipping discount mean?
It estimates the implied yearly financing cost of ignoring the discount and paying later. This helps compare supplier credit terms against loans, overdrafts, or internal cash costs.
4. Should tax be included in the discount base?
That depends on local rules and invoice structure. Some businesses discount only merchandise, while others apply the discount to broader invoice components. Use the checkbox settings that match your policy.
5. Can I include freight, handling, or service fees?
Yes. Enter them as additional charges. Then choose whether those charges should be part of the discountable base or remain outside the early payment reduction.
6. Why is my discount amount zero?
A zero discount usually means the payment day falls after the discount window, the rate is set to zero, or the discountable base became zero because no components were selected.
7. Can this calculator support 360-day and 365-day analysis?
Yes. Select either annual basis to match your organization’s finance convention. This mainly affects the annualized cost calculation used for payment timing decisions.
8. When is this calculator most useful?
It is useful for accounts payable reviews, supplier term negotiations, treasury planning, invoice approval workflows, and evaluating whether taking an early payment discount improves cash management.