Bank Math: Why Your $1M in AR Doesn’t Mean You Have $1M to Borrow

You’ve got $1,000,000 sitting in accounts receivable.

You think that means you’ve got a fat business line of credit.

Then the bank runs their math and says, “We only count $720,000.”

Your available line just got cut by $280,000. Same day. No warning.

Real-world situation

This is what it looks like in the wild:

• You’re shipping product.

• Customers are paying slower.

• Payroll hits every two weeks.

• Vendors want their money.

• You lean on your line to stay smooth.

Then the lender updates the “base” and your availability drops. Not because sales fell. Not because you did something wrong. Because the bank changed what they’re willing to count.

That gap is where cash flow problems start.

The risk (plain language)

Your AR is not what you can borrow against.

Your AR is what your accounting system shows.

The lender uses bank math. They strip your receivables down to what they actually trust in a worst-case scenario.

So “$1M in AR” becomes “what the bank actually counts.”

Then they apply their percentage and tell you what you can draw.

Here’s the flow:

Total AR → subtract what the bank doesn’t count → what the bank actually counts → multiply by advance rate → available line

A typical range is 75–85% of what they count. Call it 80% in the middle.

Example math:

• $1,000,000 total AR

• Minus $150,000 they won’t count (too old, disputed, foreign, etc.)

• Minus $80,000 because you’ve got too much with one customer

• Minus $50,000 because one old invoice poisons the rest of that customer’s invoices

• = $720,000 “counted” AR

• × 80% advance rate

• = $576,000 available credit

You started with $1M on paper. You ended with $576K in real borrowing power.

That’s not a rounding error. That’s the difference between staying current and scrambling.

Failure scenario (how this actually breaks companies)

This is the standard blow-up:

1. Customers slow pay. Your aging creeps up.

2. The bank re-runs the base. Availability shrinks.

3. You’re already drawn heavy. Now you’re “over” the limit.

4. The lender sends the notice. You’ve got days to fix it.

5. You wire cash you don’t have, or you miss payroll, or you take a bad rescue deal.

This is where “we just need a little more time” turns into a crisis.

And if you try to patch it with a bridge loan, the bridge has to be built around the bank math, not your balance sheet. Otherwise you’re bridging the wrong gap.

The bank math that cuts your line

1) Old invoices (90+ days)

Most lenders stop counting invoices once they’re past 90 days.

If your customers pay slow, your counted AR drops. That’s it.

And it compounds: the exact moment you need the line most is the moment the base starts shrinking.

2) Having too much with one customer

If one customer is 30–40% of your AR, the lender gets nervous.

They don’t want one buyer controlling your whole collateral pool.

So they cap what they’ll count from that customer.

Simple example:

• Total AR: $1,000,000

• Customer A: $350,000

• Lender only counts up to 25% from any one customer

• They’ll count $250,000

• The extra $100,000 gets ignored for the base

You can be “paid on time” for five years. Doesn’t matter. The math is the math.

3) One old invoice poisons the rest (cross-aging)

This one surprises people.

If Customer B has one invoice that goes past the cutoff, the lender can stop counting all invoices for that customer. Even the current ones.

Example:

• Customer B total: $200,000

• $160,000 is current

• $40,000 is 95 days

• Bank says: we’re not counting any of Customer B until that old one clears

Availability drops, overnight, with no change to your sales.

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We can help. Structure Your Capital https://realinnovativecapital.org/ 📞 858-585-4493

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Filter 4: Ineligibles

Beyond aging and concentration, lenders maintain a list of ineligibles: AR that is structurally excluded from the borrowing base regardless of aging.

Common “doesn’t count” items:

• Foreign invoices: harder to collect fast if something goes sideways.

• Related-party invoices: you can’t borrow against money you “owe yourself.”

• Customers who are also vendors: the bank worries the customer nets invoices and pays you less.

• Government invoices: slow pay cycles. Some lenders won’t count them without a specific program.

• Disputed invoices: if it’s not clean, it doesn’t count.

In some industries, 10–20% of AR gets tossed out before the math even starts.

RIC-AI as the fix (structure-first, not “submit and hope”)

This is the part most founders miss: the problem isn’t “your lender is being difficult.”

The problem is mismatch.

• Your current structure assumes the full AR number is usable.

• The lender’s appetite is based on what they can liquidate cleanly.

• The gap shows up as a surprise line cut.

Our job is to fix the structure so it fits lender appetite before you’re in trouble.

Here’s how we work it, in order:

1. Structured Capital: We build around the counted AR number, not the accounting AR number. We size the line with real buffers and real timing.

2. Lender Appetite: We place you with lenders whose rules match your AR profile (aging behavior, customer mix, invoice quality, industry).

3. Approval Probability: Clean story + clean collateral math = fewer surprises in underwriting and fewer “base” fights after closing.

4. Outcome: A line that stays usable when the real world gets messy.

Lumira (our internal underwriting intelligence and support infrastructure) runs the stress test up front—so you see the “line cut” scenario before the lender shows it to you.

If you’re running tight on a business line of credit, or you’re thinking about a bridge loan to buy time while AR catches up, you want the bridge sized to the bank math. Not the paper number.

Outbound reference: U.S. Small Business Administration

We can help. Structure Your Capital https://realinnovativecapital.org/ 📞 858-585-4493