Early Payment Discount Formula: Should Indian MSMEs Pay Suppliers Before the Due Date?

A supplier offers a 2% discount if your business pays within 10 days. Otherwise, the full invoice is due in 30 days. Should you pay early? The answer depends on the actual savings, the cost of using cash 20 days sooner and the risk of running short before your next customer payment. A small discount can represent a surprisingly high annualised financing rate, but the rate alone is not a complete cash-flow decision. This guide explains the early payment discount formula from both sides of a transaction. Buyers can decide when taking a discount is worthwhile. Suppliers can decide whether offering one is cheaper than borrowing or chasing collections. The calculations use illustrative rupee amounts and do not assume that every Indian supplier offers the same terms. What does 2/10 net 30 mean?The notation '2/10 net 30' means the buyer may deduct 2% from the eligible invoice amount if payment is made within 10 days of the agreed starting date. If the buyer does not take that discount, the full amount is due within 30 days. The difference between the discount deadline and normal due date is 20 days. Confirm whether the clock starts from the invoice date, receipt, acceptance or another contractually defined event. TermDiscount windowFull-payment deadlineDays accelerated1/10 net 301% within 10 days30 days202/10 net 302% within 10 days30 days201/15 net 451% within 15 days45 days302/10 net 602% within 10 days60 days50 The basic early payment discount formulaFirst calculate the rupee saving: Discount = eligible invoice amount × discount percentage. Then calculate the discounted payment: Early payment = eligible invoice amount − discount. The number of days paid early equals the normal due date minus the discount deadline. To compare the discount with an annual borrowing rate, use a simple annualised equivalent. Simple annualised cost of skipping the discount = [d ÷ (1 − d)] × [365 ÷ (N − D)], where d is the discount expressed as a decimal, N is the normal due day and D is the discount due day. The first denominator uses the amount actually paid early, not the original invoice. This is a simple annualisation, not a promise that the return can be earned repeatedly or a bank's effective interest rate. Worked example: a ₹5 lakh supplier invoiceSuppose a manufacturer owes ₹5,00,000 for approved material and has 2/10 net 30 terms. Paying by day 10 costs ₹4,90,000. Paying on day 30 costs ₹5,00,000. The immediate saving is ₹10,000 for advancing the payment by 20 days. The periodic return is ₹10,000 ÷ ₹4,90,000 = 2.0408%. The simple annualised equivalent is 2.0408% × 365 ÷ 20 = approximately 37.24%. MeasureCalculationResultDiscount₹5,00,000 × 2%₹10,000Early payment₹5,00,000 − ₹10,000₹4,90,000Days advanced30 − 1020 daysPeriodic return₹10,000 ÷ ₹4,90,0002.0408%Simple annualised equivalent2.0408% × 365 ÷ 2037.24%Illustrative funding cost at 14%₹4,90,000 × 14% × 20 ÷ 365₹3,759Illustrative net saving₹10,000 − ₹3,759₹6,241 The funding-cost calculation assumes a simple annual rate of 14% and 20 days of financing. It excludes bank fees, taxes and minimum-balance conditions. If the business can fund the payment at that marginal cost without risking payroll or production, the discount looks financially attractive. If it has no unused credit and paying early would delay wages or a critical purchase, the same transaction can be operationally dangerous. Why the 37.24% figure is not a loan quoteThe annualised figure compares the price of 20 days of supplier credit with the money you would pay early. It is useful for ranking options. It is not the actual interest charged on the invoice, and it is not the effective annual rate of a bank facility. Compounding the 20-day periodic rate repeatedly would produce a higher theoretical effective annual rate, but many businesses do not repeat identical transactions every 20 days. Compare simple rates with simple rates, and include actual fees when using an overdraft or invoice finance. The buyer's decision: discount versus liquidityA buyer should make two tests. First, compare the discount with the marginal cost of funds for the extra days. Second, test the remaining cash buffer after the early payment. A positive calculated saving is not enough if the payment forces an emergency loan or causes a supplier or salary default elsewhere. Use a short cash forecast showing expected receipts, committed payments and available credit before approving an early settlement. Confirm the invoice is genuine, approved and free of unresolved quality or quantity disputes.Check the discount applies to the intended invoice base and that the supplier will honour the deduction.Estimate the funding cost using your actual marginal rate, including relevant charges.Run a 30-day cash forecast after the proposed early payment.Confirm the payment can reach the supplier before the agreed discount deadline.Document the discount in the purchase order, invoice or supplier agreement. The supplier's decision: is faster cash worth the discount?Now reverse the example. A supplier offers to collect ₹4,90,000 on day 10 instead of ₹5,00,000 on day 30. It sacrifices ₹10,000 to accelerate cash by 20 days. That is an expensive implied financing cost compared with a 14% simple annual funding example. The offer may still make sense if collection risk is high, the supplier faces a short cash shortage, or the customer will not agree to a safer advance or milestone structure. The supplier should measure the real alternative, not assume faster is always better. Suppose the supplier could draw ₹4,90,000 for 20 days at 14% simple annual interest, with no extra fees. The approximate interest would be ₹3,759, far below the ₹10,000 discount. In that simplified case, borrowing may cost less than offering 2/10 net 30. But the loan may not be available, the customer may not pay on day 30, and collections may carry additional costs. A practical decision must include those uncertainties. When a smaller discount can be betterThe percentage is only one variable. A 1% discount for payment 35 days early can be meaningful, while 2% for payment 50 days early has a lower annualised equivalent than 2% for payment 20 days early. The annualised rate changes as the gap between deadlines changes. Always calculate it rather than assuming the larger headline percentage is the more expensive option. TermsSimple annualised equivalent, approx.What it means1/10 net 3018.43%A 1% saving for 20 days of earlier cash.2/10 net 3037.24%A 2% saving for the same 20-day gap.1/15 net 4512.29%A 1% saving for 30 days.2/10 net 6014.90%A 2% saving for 50 days. Do not ignore GST, invoice wording and credit notesCommercial discount calculations and tax treatment are separate questions. In India, whether a post-supply discount changes taxable value depends on the applicable GST provisions, documentation and conditions. Do not simply reduce the tax component or edit an already issued tax invoice because a spreadsheet shows a discount. Have the finance team confirm the current rule and whether a credit note or other adjustment is appropriate. Agree in advance whether the discount is calculated on the taxable value, gross invoice or another defined base. The agreement should state the discount percentage, eligible products, starting date, deadline, treatment of partial payments, disputed invoices and required documentation. It should also clarify what happens when a due date falls on a bank holiday. A vague message saying '2% if you pay fast' invites disputes. For customer-facing terms, Nitross also has a B2B payment terms guide covering credit limits and approval controls. Respect statutory MSME payment rulesSupplier credit arrangements cannot be treated as a way to bypass statutory protections for qualifying micro and small enterprise suppliers. India's MSMED Act contains delayed-payment rules tied to acceptance and agreed payment periods, with an outer 45-day limit for a qualifying written agreement. An early-payment discount is a voluntary commercial incentive, not permission to stretch the due date indefinitely. Verify supplier status and the actual contract with a qualified adviser where necessary. Build a spreadsheet that flags discounts worth takingA simple workbook can hold invoice amount, discount percentage, discount deadline, normal due date, marginal annual funding rate and cash-buffer status. Calculate the discount, discounted payment, days accelerated, annualised equivalent, funding cost and net estimated benefit. Add a final human approval column. The model should never automatically approve payment just because the annualised rate is high. ColumnExampleExcel or Sheets ideaA: Eligible amount500000InputB: Discount fraction0.02InputC: Discount day10InputD: Net day30InputE: Funding rate0.14InputF: Discount saving10000=A2*B2G: Early amount490000=A2-F2H: Days advanced20=D2-C2I: Annualised equivalent0.3724=B2/(1-B2)*365/H2J: Funding cost3758.90=G2*E2*H2/365K: Net benefit6241.10=F2-J2 Use input validation to prevent zero or negative day gaps, discounts of 100%, and missing invoice amounts. If D is not greater than C, the annualisation formula is not meaningful. Add a conditional flag for invoices that have not passed three-way matching or have open disputes. Keep bank charges separate if they do not scale linearly with time. A 14-day rollout for a small finance teamYou can test the system without buying new software. Start with a sample of supplier invoices, verify their payment terms and compare the savings to your cost of funds. Then make discount capture a controlled part of the payment run rather than a last-minute request from procurement. PeriodTaskOutputDays 1–3Collect invoices and supplier terms for the last 60 days.A list of actual discounts offered and missed.Days 4–5Confirm current funding costs and cash-buffer rules.A finance-approved comparison rate.Days 6–8Build and test the calculation sheet.Validated buyer and supplier examples.Days 9–11Update approval and payment-run timing.Documented discount capture workflow.Days 12–14Pilot with a few suppliers and review results.Savings report and exceptions list. Common mistakesDo not compare 2% with a bank's annual rate without adjusting for the number of days. Do not divide by the original invoice when calculating the periodic return on cash paid early. Do not use 30 days when the actual acceleration is 20 days. Do not take discounts on disputed invoices. Do not overlook GST documentation or supplier agreement wording. Do not count a projected saving as realised until the supplier accepts the payment as full settlement. Frequently asked questionsIs 2/10 net 30 always worth taking? No. The implied annualised rate is high, but your actual liquidity, borrowing costs, invoice validity and payment timing determine whether it is feasible. How is an early payment discount different from a trade discount? A trade discount generally relates to commercial pricing or quantity. An early payment discount rewards payment within a defined period. Tax and accounting treatment can differ. Should a supplier offer a 2% discount for 20 days faster payment? Compare the implied financing cost with realistic borrowing, collection risk and the value of earlier cash. It is not automatically the cheapest financing option. Can a buyer deduct the discount from GST automatically? No. The tax treatment depends on applicable rules and documentation. Ask the accountant to confirm the correct process. Does this work for freelancers and agencies? Yes, if payment terms are agreed clearly. The same calculation can help a service business evaluate an advance-payment discount, but service delivery and refund risks should be included. What if a buyer pays on day 11? Under a strict 10-day window, the discount may no longer apply. The contract or supplier's written acceptance governs. Your next actionTake the ten largest supplier invoices with optional early-payment terms. Calculate the rupee saving, days accelerated, funding cost and remaining cash buffer for each. Approve only those that make sense after the operational and documentation checks. For a wider view of the cash consequences, use Nitross's weekly working-capital framework. Sources and further readingOracle: Guidelines for Defining Payment Terms.Oracle JD Edwards: Payment Terms.Spendesk: Early payment discounts and annualised costs.