Cross-aging is a rule that lets a factor declare all of a customer’s invoices ineligible when enough of that customer’s balance has gone past due. The agreement sets the trigger percentage. Ten percent is a common example, and the provision is sometimes called the 10 percent rule.
The consequence surprises business owners. One stale invoice does not simply get excluded on its own. It can pull every other invoice from the same customer out of your funding base, including invoices issued last week that nobody disputes.
The Rule Itself
A factor calculates, for each customer, what share of that customer’s total outstanding balance is aged beyond a stated point, usually 90 days from invoice date. If that share exceeds the threshold in your agreement, the customer’s entire balance becomes ineligible.
Three numbers in your agreement control the outcome:
- The aging point. Often 90 days from invoice date, sometimes 60, occasionally measured from due date instead.
- The threshold. The share of the customer’s balance that can be aged before the rule fires. Ten percent is a common example, but your agreement sets the actual figure.
- The scope. Whether the rule applies per customer or, in stricter agreements, across affiliated entities of the same customer.
Read all three before signing. A 10 percent threshold measured at 60 days from invoice date is a substantially tighter rule than a higher threshold measured at 90 days from due date, and the difference will show up in your availability.
A Worked Example
Suppose one customer owes you four invoices:
| Invoice | Amount | Age |
| Invoice 1 | $12,000 | 95 days |
| Invoice 2 | $8,000 | 40 days |
| Invoice 3 | $30,000 | 10 days |
| Invoice 4 | $10,000 | 5 days |
| Total | $60,000 |
Only $12,000 is past 90 days. That is 20 percent of the customer’s $60,000 balance, which clears a 10 percent threshold and trips the rule.
The factor now treats the whole $60,000 as ineligible at an 85 percent advance rate, that removes $51,000 of availability. Had only the aged invoice been excluded, the reduction would have been $10,200. A $12,000 collection problem has caused an additional $40,800 temporary reduction in borrowing-base availability.
That arithmetic is the whole point of understanding cross-aging. The damage scales with the customer’s total balance, not with the size of the invoice that went stale.
What It Does to Your Availability
The practical effect lands without warning. You submit a schedule expecting a normal advance, and the funding comes back materially lower because a single customer crossed the line since your last submission.
It is worse when that customer is a large share of your book. A business with heavy concentration in one or two accounts can lose most of its availability from one slow payer. Cross-aging and concentration limits compound each other, and they are separate provisions in the agreement.
Cross-aging is also distinct from a past-due invoice simply being unfundable on its own. Whether a factor will advance against an already-late invoice is a different question, covered in our guide to factoring past-due invoices.
- 6+ months in business
- $15,000+ monthly revenue
- Active business bank account
Why Factors Apply the Rule
The rule concentrates on exposure to a single account debtor. When a meaningful share of one customer’s balance has gone unpaid past the aging point, the factor treats its remaining exposure to that same customer as less certain than the invoice dates alone would suggest.
The broader credit environment also matters to factors. According to the Administrative Office of the U.S. Courts, business filings rose 16.9 percent, from 23,043 to 26,941, in the year ending June 30, 2026. A factor holding several invoices from a customer that later fails is exposed on all of them, not merely the old ones.
Seen that way, cross-aging is an early-warning mechanism rather than a penalty aimed at you. It is blunt, and it is a common borrowing-base eligibility provision.
What You Can Do About It
Cross-aging is manageable, and most of the management happens before the rule fires.
Watch the ratio per customer, not the total. Your accounting system can report aged balance as a percentage of total balance by customer. Check it weekly against your threshold.
Chase the specific invoices that will trip it. Collecting one $12,000 invoice can restore far more availability than collecting $12,000 spread across several accounts, if that collection drops the customer below the cross-aging threshold. Prioritize by which collection prevents a cross-age event.
Negotiate the terms at the start. Threshold, aging point and measurement basis may be negotiable depending on the factor, customer quality and historical aging. This costs nothing to ask for and is difficult to change later.
Ask about carve-outs for known slow payers. Some customers may have predictable but longer payment cycles. Factors will sometimes agree to treat these differently if you raise it during underwriting.
Resolve disputes quickly. A disputed invoice sits and ages while the argument continues, and the clock does not stop because you are in the right. Verification catches problems early, which is one reason factors check invoices before funding, as our guide to how factoring companies verify invoices explains.
If your need is occasional rather than ongoing, single invoice factoring works differently, since there is no continuing borrowing base to manage.
Apply for Invoice Factoring with Delta Capital Group
Delta Capital Group provides invoice factoring and working-capital options to businesses across the country. Eligibility terms are set out during underwriting rather than discovered later. Approvals happen in as little as 24 hours. Minimum qualifications are 6 months in business, $15,000 in monthly revenue, and a 500 credit score. Apply at deltacapitalgroup.com.
Frequently Asked Questions
What is the 10 percent rule in factoring?
It is a common cross-aging threshold. If more than 10 percent of a single customer’s outstanding balance is aged beyond the stated point, usually 90 days, the factor treats that customer’s entire balance as ineligible rather than excluding only the aged portion.
Is cross-aging the same as dilution?
No. Dilution measures the gap between invoiced amounts and amounts actually collected, caused by credits, returns, and short payments. Cross-aging concerns timing. Both reduce what a factor will advance, through different mechanisms and separate provisions.
Can I negotiate the cross-aging threshold?
Sometimes. A factor may agree to a different threshold or aging point when the account history supports it, for example, measurement from due date rather than invoice date. Raise it before signing.
Does cross-aging apply across different customers?
Standard cross-aging is calculated per customer, so one slow payer does not affect unrelated accounts. Some agreements extend it across affiliated entities under common ownership. Check how your agreement defines the customer.
What happens when a cross-aged customer finally pays?
The customer’s balance can return to eligible once the aged share falls back below the threshold, assuming the receivables satisfy the factor’s other eligibility requirements, and availability recovers on the next borrowing base calculation. That is why chasing the specific aged invoice is usually the fastest remedy.
