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Business Loans for Companies With One Major Customer: Concentration Risk Explained

Winning one large customer can transform a business.

A manufacturer may build a production line around one OEM. A staffing company may place hundreds of workers with one national account. A contractor may generate most of its annual revenue from one general contractor or government customer.

That concentration can also become a major underwriting question when the business applies for financing.

The lender wants to know what happens to repayment capacity if that customer reduces orders, pays late, renegotiates pricing or leaves entirely.

Quick Answer: A company can still qualify for business financing when one customer represents a large share of revenue, but the lender will usually examine the relationship more closely. Expect questions about the customer's percentage of sales and receivables, contract terms, payment history, profitability, replacement risk and what cash flow would look like if that account materially declined.

What Is Customer Concentration Risk?

Customer concentration risk exists when a disproportionate share of a company's sales, gross profit or accounts receivable depends on one customer or a small group of customers.

The issue is not that having a large customer is inherently bad.

A major account can provide predictable orders, scale and recurring revenue.

The risk is that one outside decision can materially change the borrower's financial performance.

The U.S. Office of the Comptroller of the Currency describes concentrated receivables as a form of “single-party” risk: if the major customer takes its business elsewhere or its financial condition deteriorates, the borrower itself can be compromised. OCC guidance also notes that buyer concentration can significantly affect cash flow when problems arise. OCC.gov

BDC similarly identifies customer concentration as a material business risk during commercial due diligence and recommends understanding how much of sales comes from major customers and whether future purchases are likely to continue. BDC.ca

That same risk matters to a business lender.

Is There a Customer-Concentration Percentage That Automatically Causes a Decline?

No universal percentage applies to every business loan.

A lender can become concerned at very different concentration levels depending on the financing product, customer quality, contract structure and the rest of the borrower's financial profile.

For example, OCC guidance for asset-based lending at national banks says a bank normally considers an individual receivable account concentrated when it represents 10% or more of the receivables portfolio. That is supervisory guidance for a specific form of bank lending. It is not a universal rule saying every business with one customer above 10% of revenue is unfinanceable. OCC.gov

A cash-flow lender may be comfortable with a larger percentage when the relationship is long-standing and the borrower could still service debt if volumes declined.

Another lender may be uncomfortable with the same percentage if the contract can be cancelled immediately and the borrower has high fixed overhead.

Do not focus on finding a magic cutoff.

Prepare to explain the actual risk.

For the wider cash-flow underwriting framework, see Mehmi's Business Loans for Cash Flow.

What Does a Lender Review About the Major Customer?

The lender usually wants to know whether the relationship is durable and how severely the business would be affected if it changed.

The analysis can include:

• Percentage of total revenue generated by the customer
• Percentage of gross profit generated by the customer
• Percentage of accounts receivable owed by the customer
• Length of the business relationship
• Written contract or purchase-order history
• Remaining contract term
• Cancellation and termination provisions
• Minimum-purchase commitments, if any
• Historical payment behaviour
• Current outstanding invoices
• Customer financial strength
• Whether pricing can be renegotiated
• Whether the work is recurring or project-based
• How quickly the customer could realistically be replaced

That last question is critical.

A business with one customer at 40% of revenue can look very different if dozens of similar buyers exist and production could be redirected quickly.

The same 40% concentration can be much harder to mitigate when the company produces a highly customized product usable only by that one customer.

Can a Major Customer Actually Strengthen a Loan Application?

Yes, in some respects.

A strong anchor customer can validate demand.

Suppose a manufacturing company has supplied the same investment-grade multinational for ten years, has consistent purchase orders, clean collections and a multi-year contract.

That relationship can support the credit story.

It shows the business has an established source of revenue.

But the lender still has to consider concentration.

The major customer being financially strong reduces customer default risk.

It does not eliminate relationship-loss risk.

A financially strong customer can still change suppliers, move production internally or reduce purchasing.

The strongest application therefore presents both sides:

“This customer is important and historically reliable, and here is how we would continue servicing debt if order volume declined.”

Why Does Customer Concentration Matter More for Some Businesses Than Others?

Fixed costs determine how painful losing the account would be.

OCC guidance specifically notes that a business with limited fixed costs and more variable production costs is better positioned to absorb the loss of a major customer than a company carrying substantial fixed costs. OCC.gov

Consider two companies that each lose 40% of revenue.

A staffing company may be able to reduce some labour costs as placements decline.

A manufacturer that built a dedicated plant, hired permanent staff and financed specialized machinery for the customer may have far less flexibility.

That is why a lender will often look beyond the revenue percentage into the contribution margin and fixed-cost structure.

Mehmi's Working Capital for Cash Flow explains the broader principle: repayment depends on what remains after costs, not the headline revenue number.

How Does a Lender Stress-Test the Loss of the Customer?

A useful underwriting exercise is to remove some or all of the major customer's revenue from the forecast.

Then adjust expenses realistically.

Some costs disappear when customer volume disappears.

Others remain.

For example, materials specifically used for that customer's orders might decline.

Facility rent, administrative salaries, existing debt and insurance may not.

The underwriter then asks whether enough cash remains to cover existing and proposed financing.

That stress test is often more useful than the concentration percentage itself.

If the business would remain profitable after losing its largest customer, the risk is easier to understand.

If the loss would immediately push the business into negative cash flow, the lender may reduce the financing amount, require more collateral or decide the risk is too high.

Mehmi's Business Funding During a Revenue Drop explains how financing changes when a major source of sales has already weakened.

Illustrative Example: Business Loan With One Customer at 45% of Revenue

Assume an established U.S. manufacturer generates:

USD $200,000 per month in revenue

Its largest customer represents:

45% of revenue, or USD $90,000 per month

Assume current operating expenses are approximately:

USD $155,000 per month

Existing business debt requires:

USD $10,000 per month

That leaves approximately:

USD $35,000 per month

before a new loan payment.

Now assume the company requests:

Loan amount: USD $150,000
Assumed nominal annual interest rate: 10.50%
Term: 36 months
Payment frequency: Monthly
Origination fee: USD $0 assumed
Legal, UCC, documentation, late and NSF charges: Excluded

The estimated monthly payment is approximately:

USD $4,875.37

Total scheduled repayment is approximately:

USD $175,513.19

Estimated interest is approximately:

USD $25,513.19

Under current operations, the company would retain approximately:

USD $30,124.63 per month

after the proposed loan payment.

On the surface, that looks comfortable.

Now stress-test the major customer.

Assume the customer disappears.

Monthly revenue falls from USD $200,000 to:

USD $110,000

Assume USD $45,000 of direct variable expenses associated with that customer's production also disappear.

Operating expenses therefore fall from USD $155,000 to:

USD $110,000

Existing debt remains:

USD $10,000

Before the new loan, the company is now approximately:

USD $10,000 negative per month

After the proposed USD $4,875.37 payment, the modeled monthly deficit becomes approximately:

USD $14,875.37

This simplified example shows why the lender cannot evaluate the loan solely from current revenue.

The business comfortably supports the payment today.

It does not support it if the concentrated customer disappears under the assumptions above.

This is an illustrative stress test, not a prediction or Mehmi financing offer.

What If the Customer Is Under a Long-Term Contract?

That can strengthen the file, but read the contract carefully.

The lender may want to know:

How long is the remaining term?

Can either side terminate for convenience?

Are minimum purchase volumes actually guaranteed?

Can volumes be changed?

Is renewal automatic?

Can the customer offset disputed amounts?

Does the customer have exclusivity?

Has the contract ever been renegotiated?

A three-year agreement with enforceable minimum purchases can provide more forward visibility than an open purchase-order relationship.

But the existence of a contract alone does not eliminate risk.

A customer can experience financial difficulty.

A dispute can arise.

Or the contract may contain termination rights that materially reduce its practical value.

Provide the full relevant agreement rather than simply telling the lender that the company is “under contract.”

Does Customer Payment History Matter?

Yes.

A major customer that consistently pays within agreed terms is different from one that generates substantial sales but routinely pays late.

Payment history matters particularly when the customer also represents most of the company's receivables.

Suppose the customer represents 50% of revenue and 70% of current accounts receivable because it has stretched payments from 45 to 90 days.

The concentration risk has increased in two ways:

The borrower depends heavily on the customer's future orders.

And a large portion of the company's current cash is already trapped with that customer.

Businesses dealing primarily with collection timing can compare the options in Mehmi's Business Funding Between Customer Payments.

What Happens in Accounts-Receivable Financing?

Customer concentration becomes even more direct because the receivables themselves support the financing facility.

An A/R lender or asset-based lender establishes a borrowing base using eligible invoices.

When one customer represents an unusually large percentage of the receivable book, the lender can limit how much of that customer's balance counts toward borrowing availability.

OCC guidance for national-bank ABL says banks normally treat individual accounts representing at least 10% of the receivables portfolio as concentrated and recommends limiting concentrated accounts to 10% to 20% of the receivables borrowing base or reducing the advance percentage against the concentration. Again, those figures are OCC supervisory guidance—not universal factoring or ABL terms. OCC.gov

That distinction is important.

A business might have:

$1 million of total receivables

but still be unable to borrow against the full amount if $700,000 is owed by one customer.

Canadian businesses can review Mehmi's Accounts Receivable Financing in Canada and Asset-Based Lending Canada: Borrowing Base Guide for how concentration can affect eligibility and availability.

Can Factoring Work With One Major Customer?

Potentially.

In some cases, the major customer can actually be the strongest part of the factoring file if it is a financially sound commercial debtor with clean invoices and reliable payment history.

But concentration limits can still apply.

A factor taking exposure to one account debtor has to consider what happens if that debtor disputes invoices, delays payment or becomes insolvent.

The company should therefore provide clean documentation such as invoices, purchase orders, delivery evidence and payment history.

Canadian businesses can review Mehmi's Invoice Factoring in Canada: Costs & Approval for the differences between borrower credit and customer credit in factoring.

Factoring is weaker when the invoices themselves are disputed or the major customer has deteriorating financial strength.

Would a Business Line of Credit Be Better Than a Term Loan?

It can be when the concentrated customer also creates a recurring working-capital cycle.

Suppose a manufacturer purchases materials today and the major customer pays 60 days after delivery.

The company repeatedly needs cash before collections arrive.

A revolving line can potentially rise and fall with that operating cycle.

A fixed term loan can be useful for a one-time need, but it does not automatically refresh when the next order begins.

For Canadian borrowers, Mehmi's Business Line of Credit Canada: Rates & Limits explains why customer concentration, receivable quality and the line's ability to revolve can influence approval.

A line is not automatically safer.

If losing the major customer would destroy the company's ability to repay the line, the same concentration problem still exists.

What Documents Can Strengthen the Application?

A concentrated business should provide more transparency, not less.

Useful documentation can include recent year-end and interim financial statements, current business bank statements, A/R and A/P aging reports, an existing debt schedule and a customer sales breakdown.

For the major customer specifically, provide relevant contracts, purchase orders, historical sales, payment history and information showing the length and quality of the relationship.

A strong credit package should also quantify concentration in several ways:

Revenue concentration.

Gross-profit concentration.

Receivables concentration.

And backlog or purchase-order concentration.

Those numbers may differ materially.

A customer could represent 50% of revenue but only 25% of gross profit if the work is low-margin.

That changes the downside analysis.

Businesses applying for ordinary operating capital can also use Mehmi's Business Loans for Daily Expenses to prepare the broader use-of-funds and repayment story.

How Can You Strengthen the File Before Applying?

Do not try to hide the customer concentration.

Show the lender that management understands it.

Useful mitigation can include diversifying the sales pipeline, obtaining longer contractual commitments, reducing unnecessary fixed costs, improving cash reserves and securing additional collateral where appropriate.

The company can also reduce the loan request.

If the proposed financing only works while the major customer remains at today's volume, the amount may be too aggressive.

Another option is to finance the underlying asset instead of relying entirely on cash-flow lending.

For example, if a manufacturer is borrowing primarily to buy machinery serving several customers, equipment financing may isolate the long-life asset from the general working-capital facility.

If the need is caused by supplier timing connected to the major customer, Mehmi's Business Funding for Supplier Bills explains how confirmed orders and repayment timing can support a clearer financing request.

What If the Major Customer Is About to Renew Its Contract?

That can materially change the timing of the application.

A lender may be hesitant to underwrite several years of debt when the account representing half of the borrower's revenue expires next month.

If possible, a completed renewal can provide more certainty.

If financing cannot wait, be transparent about the renewal status.

Provide evidence of negotiations, historical renewals and current order activity.

Do not describe a pending renewal as a completed contract.

Likewise, do not assume that past renewals guarantee another one.

The lender may offer a smaller amount, shorter term or conditional structure until the relationship is more certain.

What If You Already Lost the Major Customer?

Then the lender needs to underwrite the new business, not the old one.

Do not apply using trailing annual sales as though nothing changed.

If a customer representing 40% of revenue left last month, current repayment capacity should be based on the remaining revenue and whatever replacement business is genuinely contracted.

Signed orders and contracts are stronger evidence than a sales pipeline.

Mehmi's Business Funding During a Revenue Drop provides a separate framework for businesses already dealing with the loss of material revenue.

Financing can bridge the period required to replace a customer.

It cannot guarantee that the replacement customer arrives before the money runs out.

What Should U.S. Businesses Know?

Customer concentration is primarily a credit issue rather than a special federal loan category.

For asset-based lending, OCC supervisory guidance provides a useful public example of how national banks are expected to analyze customer quality, concentrations, delinquency and borrowing-base eligibility. OCC.gov

U.S. secured receivables or business-asset financing can also involve UCC security interests.

The specific lender and state determine documentation and filing requirements.

For Mehmi Financial Group specifically, current U.S. commercial-brokerage availability is state- and product-specific. Mehmi's Terms effective September 20, 2026 list California, Illinois, Missouri, Nebraska, North Carolina, North Dakota and Vermont as restricted for general commercial brokerage unless Mehmi confirms an applicable authorization or exemption. (Mehmi Financial Group Terms) Mehmi Financial Group

Those are Mehmi service restrictions, not statements that commercial financing itself is unavailable in those states.

What Should Canadian Businesses Know?

Canadian lenders similarly treat customer concentration as a business and repayment risk.

BDC's commercial due-diligence guidance specifically identifies customer concentration as an area requiring closer investigation and recommends assessing key-customer relationships and future purchasing expectations. BDC.ca

BDC also notes in its discussion of demand loans that a lender can lose confidence in a borrower after the loss of a major customer, potentially affecting an existing demand facility. That is a feature of demand-loan structures, not a claim that every Canadian loan can automatically be recalled for customer loss. BDC.ca

For secured Canadian A/R or asset-based facilities, common-law provinces generally use PPSA security registrations, while Quebec uses the RDPRM framework.

The financing provider should handle the applicable security process for the province and transaction.

When Should You Consider Borrowing Less or Waiting?

When losing or reducing the major account would make the proposed debt unaffordable.

A lender may still approve the loan based on today's performance.

Management should perform its own downside analysis.

Ask:

What happens if the customer cuts purchases by 25%?

What happens if payment terms move from 30 to 60 days?

What happens if the contract is not renewed?

What costs can actually be removed?

How many months would it take to replace the revenue?

If the answer is that one customer decision would immediately create a debt-service deficit, reducing the requested amount or waiting for greater diversification may be appropriate.

Mehmi's Fast Funding for Cash Flow Gaps explains why financing should create breathing room rather than leave the business dependent on one optimistic revenue assumption.

FAQ: Business Loans and Customer Concentration

Can I get a business loan if one customer is 50% of my revenue?

Potentially. The lender will likely investigate the relationship closely, including contract terms, payment history, profitability and what happens to cash flow if that customer reduces or stops purchasing.

Is 20% customer concentration too high?

There is no universal business-loan cutoff. Different lenders and products use different concentration policies. OCC's ABL guidance uses specific concentration concepts for receivables lending, but those should not be applied as a universal rule to every business loan. OCC.gov

Does a written contract remove concentration risk?

No. A strong contract can improve revenue visibility, but termination rights, minimum-purchase obligations, customer credit quality and contract duration still matter.

Does it help if the major customer is a large public company?

It can strengthen the customer's credit-quality profile, particularly for receivables financing. The borrower still faces the risk that the customer reduces purchases or changes suppliers.

Can accounts receivable financing work if one customer owes most of my invoices?

Potentially, but the lender can impose concentration limits or lower advance availability against that customer. The exact limits are provider-specific.

Should I apply before or after renewing the major customer's contract?

A completed renewal can reduce uncertainty, particularly when the current contract expires soon. If financing cannot wait, disclose the renewal status honestly and provide supporting evidence.

What if the large customer pays slowly but always pays?

That still affects working capital and potentially A/R availability. A lender will review aging, payment consistency and how much of the receivable portfolio depends on that payer.

Should I borrow to diversify away from the major customer?

Potentially, when the financing supports a specific and economically supportable diversification plan. Do not add debt based solely on hoped-for new sales without modeling how the existing business will service the payment while diversification occurs.

Discuss Financing When One Customer Drives a Large Share of Revenue

Customer concentration should be quantified and explained before the financing application reaches underwriting.

Show how much revenue and gross profit comes from the major account.

Document the contract and payment history.

Calculate what the business looks like if that revenue declines.

Then size the financing around a payment the company can realistically support.

Mehmi Financial Group operates as a commercial financing brokerage and intermediary rather than a direct lender. Its current Terms identify business loans, working capital, business lines of credit, asset-based financing, invoice factoring and accounts-receivable financing among the commercial products that may be brokered where legally available. Independent financing providers control final underwriting, pricing, collateral requirements and funding decisions. Mehmi Financial Group

To discuss a business with significant customer concentration, call Mehmi Financial Group at 833-863-4644 or use the verified Mehmi Financial Group contact page. The current contact page confirms the toll-free number and notes that financing decisions depend on lender review and complete documentation. Mehmi Financial Group

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