Customer Concentration Risk: How to Explain It to Lenders

If one customer brings in most of your sales, lenders worry that losing or waiting on that customer would stop your loan repayments. The way to answer that concern is not to hide the number but to show it: your top-customer share, how long and how reliably that customer has paid, a stress test of what happens if orders fall, and what you are doing to reduce the dependence. A well-prepared file often turns "too risky" into "approve with conditions".

The numbers in this guide are illustrative. Each bank or NBFC applies its own credit policy; RBI does not prescribe a concentration limit for MSME borrowers.

Why lenders care about one big customer

A lender repays itself from your cash flow. When 60-70% of that cash flow comes from one buyer, three risks concentrate:

• Volume risk: the buyer cuts orders, switches supplier or brings work in-house.
• Payment risk: the buyer stretches payment from 45 to 90 days, or disputes invoices.
• Bargaining risk: the buyer squeezes your price because you have nowhere else to sell.

Credit officers usually look at four numbers:

Worked example: a ₹2 crore manufacturer

Patel Components makes fasteners. Illustrative annual figures:

• Turnover: ₹2 crore, of which Buyer A (a listed auto-parts company) is ₹1.3 crore, or 65%
• Receivables: ₹40 lakh, of which Buyer A owes ₹32 lakh, or 80%
• EBITDA: ₹24 lakh
• Annual debt service (interest plus principal on all loans): ₹12 lakh
• DSCR = ₹24 lakh ÷ ₹12 lakh = 2.0
• Contribution margin (sales minus variable costs): 25%

Stress test 1: Buyer A cuts orders by 30%

• Lost sales: ₹1.3 crore × 30% = ₹39 lakh
• Lost contribution: ₹39 lakh × 25% = ₹9.75 lakh
• New EBITDA: ₹24 lakh − ₹9.75 lakh = ₹14.25 lakh
• New DSCR: ₹14.25 lakh ÷ ₹12 lakh = 1.19

Many lenders look for a DSCR of around 1.25 or more, so this scenario falls just below a common comfort level. Showing it yourself tells the lender you understand the risk.

Stress test 2: Buyer A pays 30 days late

• Buyer A's sales per day: ₹1.3 crore ÷ 365 = about ₹35,600
• Extra cash tied up: ₹35,600 × 30 = about ₹10.7 lakh

That ₹10.7 lakh has to come from somewhere: a higher working capital limit, your own funds or delayed supplier payments. To see what an extra loan instalment would cost, use the EMI calculator.

What the lender might do with this

A lender seeing this file might sanction a lower limit than requested, ask for a higher margin, insist that Buyer A's payments come into an account with that lender, or suggest financing Buyer A's invoices through TReDS instead of an open cash credit limit.

How to present concentration in your loan file

Prepare a two-page note to attach to your application or CMA data:

1. Customer table: top 10 customers, sales in the last two years and the current year, share of total, and receivable days for each.
2. Relationship history: how many years you have supplied the big buyer, approved-vendor status, and any long-term contract or rate agreement.
3. Payment evidence: 12 months of bank statements with the buyer's receipts highlighted, and an ageing report of its dues.
4. Buyer quality: if it is a listed company, a PSU or a government department, say so; their annual reports or vendor portals help.
5. Stress test: the two scenarios above, with your own numbers.
6. Mitigation plan: new customers you are onboarding, target share by a date, and any credit insurance or TReDS use.

Documents checklist

• Purchase orders, supply agreement or vendor registration letter from the large buyer
• GST returns (GSTR-1) showing invoice-wise sales to each customer
• Receivables ageing, customer-wise
• Udyam registration certificate (see Udyam registration and MSME loan benefits)
• Audited financial statements and provisional figures for the current year
• Bank statements of all business accounts for 12 months
• Any TReDS registration or trade credit insurance policy

Ways to reduce the risk that lenders accept

Use TReDS for the big buyer's invoices. TReDS is an RBI-authorised platform where MSME invoices raised on large buyers are financed by banks and NBFCs without recourse to the seller, so the payment risk shifts to the buyer. As of October 2026, companies with turnover above ₹250 crore and central public sector enterprises are required to register on TReDS. Compare costs in invoice discounting vs factoring.

Route the buyer's payments through the lender. Some lenders ask for a letter from the buyer, or a tripartite arrangement, so that payments land in the account where the limit is held. It reassures them that the cash cannot be diverted.

Consider trade credit insurance. General insurers offer policies that cover non-payment by buyers. Check the premium, the buyer limit the insurer approves and the claim conditions before relying on it.

Price for the risk. If the big buyer demands 90-day credit, calculate what that costs you; see the cost of 30-day credit terms.

Diversify in steps. Lenders respect a realistic plan, such as bringing the top customer from 65% to 50% over two years, more than a promise of instant change.

Your rights if the big customer pays late

If you are a micro or small enterprise registered on Udyam, the MSMED Act requires a buyer to pay within the agreed period, which cannot exceed 45 days from acceptance of the goods or services. Delayed amounts attract compound interest at three times the RBI bank rate. You can file a delayed-payment case on the MSME ODR portal (odr.msme.gov.in, which replaced MSME Samadhaan for new cases from 15 October 2025), where the state's Micro and Small Enterprises Facilitation Council takes it up. Buyers also lose the income-tax deduction for such dues until they actually pay, under Section 37(2)(g) of the Income-tax Act, 2025 (old Section 43B(h)), which gives you leverage in a polite reminder.

Common mistakes

• Hiding the concentration: lenders see it in GST data anyway, and discovering it later damages trust.
• Applying for a limit sized on the big buyer's peak orders without showing how you repay if those orders drop.
• Letting the big buyer's dues age past 90 days: banks typically exclude older receivables from drawing power, which shrinks your usable limit just when you need it.
• No written contract: an emailed rate agreement is better than nothing; a signed vendor agreement is better still.
• Using a term loan to bridge late payments instead of a working capital or invoice-based product.

If the lender rejects or cuts your limit

1. Ask the branch for the reason in writing and which documents would change the decision.
2. Fix what you can, such as adding the stress test, TReDS registration or a buyer letter, and reapply; a CGTMSE guarantee may also help, see CGTMSE collateral-free loans.
3. If the bank does not reply, delays your application without reason or charges fees not in its schedule, complain to its grievance cell. If unresolved after 30 days, file on cms.rbi.org.in under the Reserve Bank – Integrated Ombudsman Scheme, 2026. Note that the Ombudsman does not take up a lender's commercial judgment, such as how much limit to sanction; it looks at deficiency in service.

Key takeaways

• Lenders worry when one customer dominates sales or receivables; there is no RBI threshold, but above about half of sales expect close questions.
• Show the numbers yourself: customer table, payment history and a DSCR stress test.
• In the illustrative example, a 30% cut in the big buyer's orders drops DSCR from 2.0 to 1.19.
• TReDS, payment routing, credit insurance and a dated diversification plan are mitigants lenders accept.
• MSE suppliers can use the 45-day rule and the MSME ODR portal when the big buyer pays late.