7 Ways to Finance a Business With One Major Customer Safely

When one major customer brings in most of your revenue, that relationship can open doors to funding. But it’s risky, and lenders or investors will dig into your contract, payment history, the customer’s stability, and how you plan to handle that risk.

You can finance your business through invoice factoring, accounts receivable financing, purchase order loans, contract-backed credit, asset-based lending, supplier credit, or strategic equity. Each one has its own strengths, costs, and repayment quirks.

You’ll also need to cut down risk before you take on funding. Strong contracts, clear payment terms, solid records, and a plan to get more customers will boost your financing options and keep your cash flow safer.

Assess Customer Concentration And Contract Strength

Show lenders or investors how much of your revenue depends on this one customer and how reliable that money really is. Clear data, solid payment records, and good contract terms can help you land better financing.

Measure Revenue Dependency

Figure out what percentage of your revenue comes from the major customer over the last 12, 24, and 36 months. Look at both total sales and gross profit—sometimes a customer brings in a lot of sales but not much profit.

Track how the customer’s spending, order size, and renewal patterns change over time. Are sales based on a signed contract, repeat purchase orders, or just a handshake? Lenders usually see recurring orders as riskier if either side can cancel them easily.

Make a simple schedule with:

Revenue from the major customer
Percentage of total revenue
Gross margin from that customer
Contract length and renewal date
Revenue from your next four biggest customers

If concentration spiked recently, explain why. Maybe it’s just a temporary project, not a long-term trend. Show your plan for getting new customers, but keep projections grounded in real leads and sensible timelines.

Review Payment Terms And Purchase Commitments

Go over the customer’s payment history—average days to pay, late invoices, disputes, and any credit-limit changes. If payments are consistent, you’ll have a stronger case for a loan, line of credit, or invoice financing.

Check if the contract has a fixed term, minimum purchase amount, automatic renewal, or a set notice period for termination. A written promise to buy a specific amount is way better than a vague intention. Find out if the customer can walk away for convenience or cut orders with no penalty.

Watch for terms that affect financing:

Assignment of receivables
Setoff rights
Chargebacks or returns
Early termination clauses
Restrictions on pledging invoices

Get written confirmation of open orders and expected purchases if you can. Keep your signed contracts, purchase orders, invoices, and payment records tidy so lenders can check them fast.

Use Invoice Factoring

Invoice factoring lets you turn unpaid B2B invoices into working capital without waiting months for payment. You sell eligible receivables to a factoring company. Make sure you understand how repayment risk works before you sign anything.

Sell Eligible Receivables

A factor usually fronts about 70% to 90% of the invoice’s value. When your customer pays, the factor takes its cut and sends you the rest. Fees are typically 1% to 5%, but they depend on invoice terms, your customer’s credit, your industry, and how many invoices you factor.

In factoring, your major customer’s credit history matters more than yours. Factors check if the customer accepts the invoice, pays on time, and doesn’t have big disputes. Make sure the invoices are:

Billed to another business or a government agency
Due within agreed terms
Free of disputes, liens, or old financing claims
Backed by completed work or delivered goods

Factoring is best if your customer pays reliably but slowly. Read the contract for minimum volume, setup fees, wire charges, and extra costs if payments come in late.

Compare Recourse And Non-Recourse Agreements

With recourse factoring, you have to repay the factor or swap the invoice if your customer doesn’t pay on time. It’s usually cheaper, but you keep most of the risk. This can work if your major customer is financially solid and pays on time.

With non-recourse factoring, the factor takes on some of the risk if the customer goes bust. But they might exclude disputes, fraud, late deliveries, or other contract issues. Non-recourse costs more, and factors can be picky about which customers or invoices they’ll cover.

Ask:

What events make me repay?
How long does the factor wait before asking for repayment?
What risks does non-recourse not cover?
Who contacts and collects from my customer?

Check the notice and collection process. If the factor contacts your customer directly, it could affect your relationship.

Arrange Accounts Receivable Financing

You can use unpaid invoices to get working capital before your customer pays. Lenders focus on invoice quality, customer payment history, concentration risk, and how well you keep records.

Establish A Borrowing Base

Your borrowing base is the amount you can draw against eligible invoices. Lenders might advance 70% to 85% of approved receivables, depending on customer quality, payment terms, and industry risk.

If one customer dominates, the lender will look closely. They might exclude invoices that are overdue, disputed, owed by related parties, or have return rights. A concentration limit could cap how much of your borrowing base comes from one customer.

Before you close, confirm:

Which invoices qualify
Advance rate
Reserve or holdback
Concentration limits
Fees and interest
Who collects payments
What happens if the customer pays late

Check your customer contract for assignment restrictions. Some contracts block you from assigning payment rights without written consent. Tell your customer about any required lockbox or payment redirection before you start funding.

Manage Lender Reporting Requirements

You’ll probably need to submit an accounts receivable aging report, borrowing-base certificate, invoice register, and bank statement regularly. If one customer is most of your revenue, the lender might want weekly reports.

Keep your records clean and consistent. Match each invoice to a contract, purchase order, delivery note, or proof of service. Report credits, disputes, returns, offsets, and payments right away. Don’t include invoices in the borrowing base after they’re paid.

Watch your major customer’s payment habits closely. A missed payment, dispute, or big change in their finances can cut your availability or trigger a reserve. Assign someone to handle lender reports and keep documents organized.

Late or sloppy reporting delays funding and can breach your agreement. Double-check reporting deadlines, formats, and contact info before drawing funds.

Secure a Purchase Order Loan

A purchase order loan covers supplier costs before your customer pays. Lenders check your purchase order, supplier, profit margin, and customer’s ability to pay before approving.

Fund Supplier Deposits

Purchase order financing is a good fit when you have a valid customer purchase order but don’t have the cash for goods or materials. The lender usually pays your supplier directly, saving your cash for other needs.

Before you apply, gather the purchase order, supplier quote, delivery terms, and a clear cost breakdown. Lenders compare the supplier’s price to the customer’s order value. You’ll need enough gross margin to cover financing fees, shipping, insurance, and surprises.

Ask about the total fee, payment schedule, minimum funding amount, and what happens if the customer changes or cancels the order. Fees usually run 1.5% to 6% per transaction, depending on the lender, order, customer, industry, and risk.

Confirm Customer Creditworthiness

Lenders care more about your customer’s ability to pay than your own credit. Before you seek funding, check their payment history, financial health, order terms, and track record for accepting deliveries.

Prove the purchase order is real and authorized. Lenders might contact your customer to confirm the order, delivery schedule, and payment terms. If the customer can cancel the order without a penalty, you might get worse terms.

Check if the customer pays your business, the lender, or a factor after delivery. You’re still on the hook for meeting specs and deadlines. If the customer rejects the shipment or pays late, you could still owe fees, depending on your agreement. Make sure you’ve got enough margin to cover these risks.

Obtain A Contract-Backed Line Of Credit

A contract-backed line of credit helps you cover payroll, materials, and other costs before your customer pays. Lenders focus on the contract’s value, payment terms, customer strength, and whether you can deliver.

Pledge Contracted Revenue

You might qualify by assigning some or all of your expected contract payments to the lender. The lender checks the customer’s credit, contract amount, payment schedule, cancellation rights, and acceptance terms. A signed contract with a reliable customer is a lot stronger than a proposal or nonbinding agreement.

Your credit limit might be based on a portion of eligible receivables instead of the full contract value. For example, a lender could advance funds after you send approved invoices for delivered goods or services. The lender might require payments to go to a controlled account and use them to pay down the balance.

Before you sign, check if the arrangement covers just one contract or future receivables too. Look at the interest rate, draw fees, repayment rules, and any personal guarantee. Make sure your cash-flow forecast shows you can pay the loan after covering operating costs.

Negotiate Covenants And Collateral

Read every covenant before you accept the facility. Usual requirements are minimum cash balances, timely financial statements, limits on new debt, restrictions on owner payouts, and notice of contract changes. If you breach a covenant, the lender could cut your borrowing limit or call the loan, even if your customer still owes you.

Ask the lender to tie borrowing limits to clear milestones, like approved invoices or finished project stages. Avoid broad terms that let the lender cancel funding just because they feel like it.

The lender might want accounts receivable, equipment, inventory, or a personal guarantee as collateral. Try to keep the security interest focused on assets linked to the contract. Negotiate release terms so the lender drops its claim once you pay off the related balance. Get any customer-consent requirements in writing, especially if assignment is restricted.

Pursue Asset-Based Lending

Asset-based lending lets you borrow against business assets like inventory or equipment, not just profits or credit history. You can use these assets to back a loan or revolving credit line, but having one major customer may affect how lenders value your collateral.

Leverage Inventory And Equipment

You can pledge finished goods, raw materials, machinery, vehicles, and other equipment as collateral. Lenders usually check ownership records, appraisals, resale values, maintenance logs, and the condition of each asset.

Equipment with a strong resale market might get you more borrowing power than specialized machinery with limited buyers. Inventory can also support financing, but lenders often get picky.

They might exclude obsolete, seasonal, damaged, or slow-moving goods. If your main customer makes up most of your sales, double-check that your inventory isn’t just custom-made for them.

Lenders may discount custom goods since they’re tough to sell if your customer cuts orders. You’ll want to ask about reporting requirements, too.

Some lenders require regular inventory counts, equipment inspections, or borrowing-base reports. Missing these requirements can limit your access to funds or bump up your costs.

Understand Advance Rates

An advance rate is the percentage of an asset’s approved value that a lender will finance. For example, a lender might offer 80% of eligible accounts receivable but a lower rate for inventory or equipment because they take longer to sell.

Ask the lender how it defines eligible collateral. They might exclude invoices owed by your main customer if that customer has weak credit, pays slowly, or represents too much of your receivables.

Customer concentration limits can shrink your borrowing base, even if the customer pays on time. Before signing, review these details:

Which assets qualify
How often values get updated
Fees for inspections and reports
How concentration limits affect borrowing
What happens if your customer pays late

This structure can give you working capital, but you’ll want to keep enough cash on hand in case orders drop suddenly.

Seek Supplier Trade Credit

Supplier trade credit lets you get inventory, materials, or services before paying for them. You can protect cash flow while you wait for your customer to pay, but you need to match the credit terms to your sales cycle.

Make sure your supplier can actually support this setup.

Extend Payment Windows

Ask suppliers to extend payment terms from immediate payment or Net 30 to Net 60 or Net 90, depending on your customer’s payment schedule. Explain that one customer drives a big chunk of your revenue, and back it up with purchase orders, contracts, and payment records.

Start with suppliers who already know your payment history. They’re usually more open to longer terms than new suppliers.

You could offer a partial payment at delivery and pay the rest later, or ask for a higher credit limit for confirmed customer orders. Always review the full cost before agreeing, since some suppliers might charge higher prices, late fees, or reduce discounts for longer terms.

Protect your credit record by tracking due dates and keeping enough cash on hand if your customer pays late or disputes an invoice.

Align Terms With Customer Collections

Set your supplier due dates just after you expect to collect from your customer. For example, if your customer pays 45 days after invoicing, try to get supplier terms of Net 60.

That gives you time to get paid, check the amount, and pay your supplier without dipping into expensive short-term debt. Don’t rely only on your customer’s usual payment habits.

Review the contract for approval steps, billing requirements, dispute rights, and payment deadlines. Sometimes a customer that usually pays in 45 days might take longer if they need a signed delivery record or a purchase-order match.

Track each transaction in a simple schedule:

Customer invoice date and expected payment date
Supplier invoice date and due date
Expected gross margin
Cash needed if payment’s late

Keep supplier terms separate from customer concentration risk. If your main customer cancels, pays late, or cuts orders, contact your supplier early and try to renegotiate before the account goes overdue.

Use Equity Or Strategic Capital

Equity can fund growth without monthly loan payments, but it does shrink your ownership. Strategic investors might also bring connections, advice, or access to new customers, which could help you rely less on one big account.

Attract Industry Investors

Look for investors who know your customer’s industry and appreciate your specialized knowledge, contracts, or delivery systems. A strategic investor could be a supplier, distributor, industry exec, or company that wants what you offer.

Prepare clear evidence before you seek funding. Show your revenue history, customer concentration, contract terms, renewal rates, profit margins, and your plan to win more customers.

Explain how the investment will reduce risk, not just support the status quo. Define the investor’s role in writing.

Spell out whether they get shares, voting rights, board seats, or information rights. Steer clear of exclusivity unless you’re sure how it could affect future sales or partnerships.

Protect Ownership And Control

Negotiate the investment with your long-term goals in mind, not just the cash you need right now. Giving up a big ownership chunk might solve today’s funding problem but leave you with less say over pricing, hiring, budgets, and future fundraising.

Before you accept an offer, figure out how much dilution you’ll face. Review the valuation, share percentage, liquidation preferences, and any future funding rights.

Ask a lawyer to walk you through terms that could give the investor priority if the company sells or shuts down. You might want to raise money in stages tied to specific goals, like hiring a sales rep or landing a second major customer.

Keep enough voting power for routine decisions, and limit approval rights to big moves. Document your rights in a shareholder agreement.

Reduce Risk Before Accepting Funding

A single major customer might make your revenue look steady, but it can leave you exposed. Build a broader sales pipeline and test if your projected cash flow can handle loan payments during a customer loss or delay.

Diversify The Customer Base

Set a goal for customer concentration before you take on funding. Maybe aim to keep your largest customer below 30% of annual revenue over time.

The right limit depends on your industry, contract strength, profit margin, and how easily you can replace the account. Use some borrowed funds for sales activities that bring in new revenue, like hiring a salesperson, entering a new market, or improving retention.

Don’t spend the whole loan on expansion unless you’re sure there’s demand. Track leads, conversion rates, sales cycles, and expected contract values.

Review your major customer’s contract for renewal dates, termination rights, payment terms, and minimum purchase commitments. Ask if the customer can cancel without notice or delay payments.

Even a signed, long-term contract doesn’t remove the need for backup customers.

Prepare Cash Flow Forecasts

Build a 13-week cash flow forecast before you accept funding. List expected customer receipts by week, using realistic payment dates—not just invoice due dates.

Then record payroll, suppliers, taxes, loan payments, rent, and other fixed costs. Make at least three cases:

Base case: your main customer pays on time and revenue stays steady.
Delay case: the customer pays 30 to 60 days late.
Loss case: the customer cuts orders or stops buying.

Check if you can make debt payments in each case. Try to keep a cash reserve for a few months of essential expenses, if you can.

Compare your forecast with the funding terms—interest, fees, repayment schedule, and any borrowing base limits. Update your forecast every week after funding arrives.

If cash dips below your minimum, pause non-essential spending and contact the lender early. It’s way better than waiting until you miss a payment.

Frequently Asked Questions

A major customer can support financing if you provide reliable payment records, signed contracts, and clear cash-flow projections. Compare loan terms, invoice-based funding, and steps to reduce your dependence on one client.

How can a business secure financing when most of its revenue comes from one customer?

Show that your customer pays on time and runs a stable business. Lenders will check your payment history, contract terms, renewal dates, and the customer’s share of your revenue.

Prepare at least 12 to 24 months of financial statements, tax returns, bank records, and accounts receivable reports. A signed, long-term contract helps, especially if it spells out payment terms and minimum purchases.

Improve your odds by offering collateral, cutting expenses, or adding a personal guarantee. Don’t borrow more than your cash flow can handle if your customer pays late or leaves.

What financing options are available for businesses with customer concentration risk?

You might consider:

Business lines of credit: Draw funds as needed, pay interest only on what you use.
Term loans: Get a fixed amount, repay over time.
Invoice financing: Get an advance against unpaid invoices from approved customers.
Invoice factoring: Sell eligible invoices to a finance company, which collects payment.
Purchase-order financing: A lender funds production or purchasing before you fill an order.
SBA-backed loans: Lender provides the loan, SBA guarantees part of the balance.
Equipment financing: Use equipment as collateral.
Customer deposits: Negotiate partial payment upfront to cut your borrowing need.

Each option has different costs, repayment terms, and approval standards. Compare APR, fees, personal guarantees, collateral, and how customer concentration affects approval.

Can invoices from a major customer be used as collateral for funding?

Yes, some lenders accept unpaid invoices as collateral through accounts receivable financing or a revolving line of credit. The lender checks if the invoices are valid, undisputed, and payable by a creditworthy customer.

You might get a percentage of the invoice value before your customer pays. The lender may hold a security interest in the receivables and require payments to a controlled account.

Read your agreement closely. Watch for reserve amounts, service fees, recourse requirements, minimum volume rules, and what happens if your customer pays late or disputes an invoice.

How does a single large customer affect eligibility for an SBA loan?

Customer concentration can increase the lender’s risk. They might ask what would happen to your revenue, payroll, and debt payments if that customer cut orders or ended the contract.

SBA loans still require the lender to check your credit history, cash flow, collateral, management experience, and repayment ability. A strong contract, steady payment history, and a realistic backup sales plan can help.

Be upfront about your customer concentration. Hiding a major risk can hurt your application and cause problems during underwriting.

What documents do lenders require when a business depends on one key client?

Have these ready:

Two or three years of business tax returns, if available
Recent profit-and-loss statements and balance sheets
Business and personal bank statements
Accounts receivable aging reports
Copies of invoices and payment records
The major customer contract, with renewal and termination terms
Purchase orders, statements of work, or service agreements
A customer concentration report showing revenue by client
A cash-flow forecast with different customer-loss scenarios
Business licenses, ownership records, and debt schedules
Personal tax returns and a personal financial statement, if needed

Lenders may also want proof that the customer accepted the work and there’s no billing dispute. Keep records showing when you delivered goods or services and when the customer paid.

How can a business reduce customer concentration risk while raising capital?

Build a sales plan that goes after new customers in different industries or regions. Set monthly targets for qualified leads and proposals.

Track signed contracts and revenue from customers outside your main account. You might want to get a bit creative with your goals—sometimes it takes some trial and error to see what sticks.

Try negotiating shorter payment periods, deposits, or automatic renewals with your biggest customer. Minimum purchase commitments can help your cash flow, but let's be honest, they won't solve everything if you don't bring in new customers.

Use financing to fund things that actually help you grow your customer base. That could mean hiring sales staff, ramping up marketing, getting certifications, or buying equipment.

Keep an eye on how much revenue each new customer brings in. Don't use new debt just to patch over losses from a declining key account—it's a slippery slope.