Invoice factoring underwriting judges a deal mainly by the customers who owe the invoices, not by the business selling them. The factor buys receivables and gets paid when those customers pay, so it checks each debtor's credit, reads the aging report, caps exposure to any one customer and uses the client's bank statements to confirm the invoices are real.
Why does invoice factoring underwriting focus on account debtors?
Invoice factoring underwriting focuses on account debtors because they are the source of repayment. An account debtor is the customer who owes money on an invoice. When a factor buys that invoice, its money comes back when the debtor pays, so the debtor's ability and habit of paying matter more than the seller's balance sheet.
This flips the usual order of business lending. A term lender asks whether the borrower's cash flow can cover a payment. A factor asks whether a list of other companies will pay their bills on time. A young or unprofitable client selling to large, reliable customers can be a fine factoring account. A profitable client selling to shaky customers may not be.
The legal mechanism supports this. Under UCC section 9-406, published by Cornell Law School's Legal Information Institute, once an account debtor receives notice that the amount owed has been assigned and that payment goes to the assignee, it can discharge its debt only by paying the assignee. Paying the original seller after that notice no longer settles the bill. That is why factors send notices of assignment and ask debtors to pay into an account the factor controls.
The client still gets reviewed. A factor checks who owns the business, whether it has tax liens or other lenders with a claim on receivables, and whether it actually delivers what it invoices. But the client review is about honesty and operations. The repayment review is about the debtors.
That makes factoring a common option for businesses that cannot pass a cash flow test yet. Lenders that do fund young companies on their own merits use a different set of checks, covered in startup business loan underwriting.
Account debtor credit checks before a factor buys invoices
Account debtor credit checks tell a factor whether each customer is likely to pay in full and on time. The factor looks at business credit reports, payment history with suppliers, public filings, size, industry and its own history with that debtor, then sets a credit limit for how much of that debtor's paper it will buy.
The checks scale with exposure. A small debtor with a single invoice might get a quick credit report. A large debtor whose invoices will make up much of the portfolio gets a deeper look and an ongoing limit that the factor reviews as balances grow.
What the factor wants to learn about each debtor:
- Does it pay? Trade payment history shows whether it pays suppliers within terms or stretches them.
- Is it solvent? Liens, judgments, bankruptcy filings and collection actions all count against it.
- Is it real and independent? The debtor should exist at the stated address, and it should not be owned by the client or its owners.
- Will it dispute? Some debtors routinely short-pay or dispute invoices. A dispute stops payment just as surely as insolvency.
- Will it accept the assignment? Some large buyers have contract terms that limit assignment or require their own paperwork before paying a factor.
Government and very large corporate debtors usually pay, but often slowly and with strict invoicing rules. A rejected invoice for a missing purchase order number can sit unpaid for months.
Reading an accounts receivable aging report in a factoring file
An accounts receivable aging report lists every unpaid invoice by customer and sorts it into columns by how long it has been outstanding, usually current, 31 to 60, 61 to 90 and over 90 days. In a factoring file it shows which debtors pay on time, which invoices are too old to buy and how concentrated the receivables are.
Most factors set an age limit, often 90 days from the invoice date. Invoices past it are ineligible. Many also apply a cross-aging rule: if a large enough share of one debtor's balance is past the limit, the factor treats all of that debtor's invoices as ineligible, since the debtor is showing it does not pay on time.
A worked aging example
The figures below are an example. The 90 day limit, 50% cross-aging rule, 25% concentration cap and 85% advance rate are example policy values a factor might use, not industry standards.
| Debtor (example) | Current | 31 to 60 | 61 to 90 | Over 90 | Total |
|---|---|---|---|---|---|
| Regional Grocer A | $62,000 | $18,000 | $0 | $0 | $80,000 |
| Hospital System B | $24,000 | $16,000 | $12,000 | $4,000 | $56,000 |
| Builder C | $6,000 | $0 | $4,000 | $14,000 | $24,000 |
| Distributor D | $28,000 | $12,000 | $0 | $0 | $40,000 |
| Total | $120,000 | $46,000 | $16,000 | $18,000 | $200,000 |
Step by step:
- Remove invoices over 90 days. That takes out $18,000, leaving $182,000.
- Apply cross-aging. Builder C has $14,000 of its $24,000 over 90 days, which is 58%. The rest of its balance, $10,000, is also excluded. Eligible receivables fall to $172,000.
- Apply the concentration cap. No debtor may exceed 25% of eligible receivables, which is $43,000. Regional Grocer A has $80,000 eligible, so $37,000 is excluded. Hospital System B has $52,000 left after step 1, so $9,000 is excluded. Eligible receivables fall to $126,000.
- Apply the advance rate. 85% of $126,000 is $107,100 available to the client.
The client has $200,000 of open invoices but can draw only about $107,000 against them. That gap surprises many first-time clients and is worth explaining before the deal closes.
Concentration limits and advance rates on factored invoices
Concentration limits cap how much of a factor's exposure can sit with one account debtor, and advance rates set how much of each eligible invoice the factor pays up front. Together they keep a single slow or failed customer from wiping out the reserve the factor holds back to cover disputes, short payments and fees.
The FDIC RMS Manual of Examination Policies, Section 3.2 describes the same controls for banks that lend against receivables: an agreement setting a percentage advance against acceptable receivables, a maximum dollar amount due from any one account debtor, the financial strength of debtor accounts, the aging of receivables and concentrations of debtor accounts. Factors work with the same tools, though they buy invoices rather than lend against them.
The advance is not the whole price. The factor holds the rest of each invoice as a reserve and releases it, minus fees, after the debtor pays. If a debtor short-pays, the reserve absorbs the gap. A lower advance rate builds a larger cushion.
Concentration caps are set per debtor and can be raised for very strong ones. A client selling mostly to one national retailer may get a higher cap on that retailer than it would on a small regional buyer. Even then, a factor with most of its money riding on one debtor relationship is taking the debtor's risk and the risk of that relationship ending.
Factors also watch dilution, which is the share of invoiced amounts never collected because of credits, returns, discounts or disputes. A client with high dilution needs a lower advance rate, because more of each invoice will not turn into cash.
What do a factoring client's bank statements show?
A factoring client's bank statements show whether its customers have really been paying it, what it already owes other lenders and how it handles cash. The factor matches past debtor payments to the invoices on the aging report and looks for debits to other funders that may already claim the same receivables.
Payments from debtors land in the client's operating account before factoring starts. Reading several months of those credits answers questions the aging report cannot:
- Do the debtors on the aging appear as payers? A large customer on the aging report that never shows up as a deposit is a question the client must answer.
- How long do debtors take? Matching invoice dates to deposit dates gives each debtor's real payment speed.
- Is there another factor or lender? Deposits from a factoring company, or regular debits to one, suggest receivables are already sold or pledged. Daily ACH debits often signal a merchant cash advance with its own claim on future receipts.
- Are tax payments current? Missing payroll tax deposits can lead to a federal tax lien, which can compete with the factor's claim.
- Does cash flow cover costs between collections? Even with an advance, the client must pay staff and suppliers.
A staffing agency is a common factoring client, and its statements should show insurance premiums for workers' compensation coverage it carries for its placed staff. Gaps in those premiums are worth asking about. Workers' compensation benefits that a person receives are a separate topic, covered in workers' compensation income for a mortgage.
TrueBankFlow groups deposits from the same payer with their cadence and average amount, sorts loan payments into their own category and flags out-of-pattern credits, each linked to the statement line, which makes it faster to match debtor payments against the aging report. The decision on each debtor stays with the factor.
Factoring fraud signs: fake invoices, double pledging and diverted payments
Factoring fraud signs include invoices for work not done, the same invoices sold to two factors, debtors owned by the client, and debtor payments diverted to the client's account after the notice of assignment. Each one breaks the link between an invoice and real cash, so factors check for them before funding and keep checking after.
Watch for these:
- Invoices with no delivery proof. Factors ask for signed delivery receipts, bills of lading or timesheets. Missing proof on a large invoice is a stop sign.
- Verification that fails. A factor calls or emails the debtor's payables team to confirm an invoice. A debtor who has never heard of the invoice ends the deal.
- Related debtors. A debtor sharing an address, phone number or owner with the client may be a shell that pays only as long as the scheme lasts.
- Prior UCC filings. Another lender with a filed lien on receivables may claim the same invoices.
- Payments still landing with the client. After notice, debtor payments should go to the factor. Debtor deposits still showing on the client's statement mean the client is keeping money that belongs to the factor.
- Sudden jumps in invoice volume from a client whose deposits never showed that size.
Factoring sits beside other forms of business credit. A client that grows past factoring may move to a bank line secured by receivables, which brings in the cash flow and projection tests covered in commercial loan underwriting and cash flow projection analysis.