Above roughly $250,000, a business line of credit stops being a product you shop for and becomes a calculation lenders run. The limit on a large line is not set by what you ask for; it is set by what your balance sheet, cash flow, and collateral can defend. Five numbers do most of that defending — and this article walks through each one the way an underwriter reads it. If you cannot produce those five numbers from memory today, that is normal — but it is also the difference between borrowers who negotiate and borrowers who wait.
$250,000: The Unsecured Ceiling Most Lenders Won't Cross
Small unsecured lines are underwritten on credit and revenue, and they work well — but there is a practical ceiling where that model runs out of information. For most lenders, it arrives somewhere in the low-to-mid six figures. Past that point, the product changes character: lenders want collateral, or a file so strong that collateral becomes a formality. High-limit lines come with borrowing base reporting, covenants, and periodic monitoring, because the lender's exposure is large enough to watch closely. This is not a wall; it is a change of tier — and the flip side is equally real. Companies with strong files and real collateral should not accept an unsecured-sized limit by default. If receivables or property can support a larger commitment, the larger commitment typically prices better per dollar borrowed, because the lender's risk is lower. One tell that you have crossed into this tier: the lender starts asking for monthly borrowing base certificates before they ask for your story. The structures that carry high limits on assets alone are the same ones described on our business lines of credit page — secured, mechanical, and willing to grow with sales.
75–85%: The Advance Rate Against Receivables
For a secured line, the engine is the borrowing base, and the base runs on advance rates. Accounts receivable lead: lenders commonly advance 75–85% of eligible receivables. The gap between "receivables" and eligible receivables is where files win or lose. Invoices are typically excluded if they are past 90 days, owed by related parties, already pledged elsewhere, or concentrated with one customer beyond the lender's cap — commonly a single-digit share of the base to low double digits, depending on the customer's credit. Watch the arithmetic of a $1 million receivable ledger: strip out $200,000 of ineligibles and you are advancing against $800,000 at, say, 80% — a $640,000 borrowing capacity from a million dollars of paper.
Two structural notes for growing companies. First, advances are re-measured as invoices age — a base that was $640,000 in January can quietly be $480,000 in March if collections lag, so cash forecasting has to account for base movement, not just the headline limit. Second, because ineligible invoices can be cured — collected, replaced, swapped — a rigorous collections process is, in a real sense, part of your borrowing capacity. In practice, most growing companies learn their true advance rate not from a term sheet but from their first borrowing base report — a document worth studying line by line. Companies that treat the aging report as a finance document rather than a collections chore tend to find their limit grows on its own.
1.25x: The Coverage Threshold That Caps Bigger Lines
Collateral tells a lender what it can recover; coverage tells it whether it should have to. The standard test is fixed-charge coverage: adjusted cash flow — EBITDA minus owner distributions — divided by total debt service, including the new line's payments. Many lenders want that ratio at 1.25x or better, meaning cash flow covers obligations with a quarter of cushion. The number moves against you as you grow: every new draw adds to debt service, every new hire adds to fixed costs, and an expansion can drop coverage below the threshold at precisely the moment you need the line most. Lenders have watched this movie many times, which is why a growth plan that shows how coverage recovers — say, contract revenue starting in month four — does more for a large request than optimism does. One nuance worth knowing: some lenders calculate coverage on trailing twelve months, others on the most recent quarter annualized. Same company, two different answers — so a file reviewed when its financials are strongest fares better than one reviewed at the seasonal bottom. If your coverage looks thin, the fix is rarely cosmetic: pay down existing debt, time draws to match revenue arrival, or bring documentation that supports the second half of the year.
12 Months: The Clock That Governs Every Line
Large lines live on annual cycles. Commitment periods commonly run 12 months, with renewal subject to a fresh look at financials, and many agreements include a clean-up requirement — commonly a stretch of 30 days at zero during the year. On larger facilities, borrowing base certificates may be due monthly, aging reports quarterly, and tax returns annually. None of this is bureaucracy for its own sake: on a $500,000 commitment, the lender's monitoring costs are real, and the borrowers who keep that paperwork pristine are the ones whose renewals are quiet and whose limits ratchet upward. There is also a negotiating rhythm hidden in the cycle: the month before renewal, with financials clean and utilization low, is the natural moment to ask for an increase. Asking mid-year, mid-draw, with an incomplete file, is the natural moment to be told no — the timing of the ask matters as much as the numbers behind it.
$5,000,000: The SBA Reference Point — and What Happens Above It
The SBA 7(a) program, including its working capital line variants, generally supports loans up to $5 million, with the agency guaranteeing commonly 75–85% of the amount depending on size. It is worth knowing what that guarantee does and does not do: it does not lower your payment, and it does not make an unqualified deal qualified. It shifts a portion of the lender's risk, which improves terms for borrowers whose fundamentals already work — a distinction that saves wasted applications. For growing companies, the $5 million mark serves as a useful landmark: below it, a government guarantee can meaningfully improve terms; above it, you are in purely private territory. Facilities larger than $5 million are typically assembled rather than shopped — a receivables facility from a bank or factor, equipment term debt, and a commercial real estate loan on any owned property, stacked into one capital structure. That stacking is normal at scale; what matters is that each layer matches its asset, with the line reserved for the working capital it was built to finance. For the term-loan layers, a lender will walk through business loan structures that fit alongside the line rather than competing with it. In that assembled world, the lender's question shifts from whether to approve to who leads, who participates, and in what order — which is why having the right team around the table matters more at this scale than at any other.
The Numbers in Action: A $500,000 Line for a Distributor
Put the five numbers to work. A regional distributor does $8 million in annual revenue. The calculation runs in two passes.
Capacity from collateral. Receivables: $650,000 outstanding, $600,000 eligible after excluding invoices past 90 days and concentration excess on the largest customer — at an 80% advance rate, that contributes $480,000. Inventory: $250,000 on hand, $200,000 eligible at a 40% advance rate, contributing $80,000. Total borrowing base: $560,000.
Capacity from cash flow. EBITDA runs $950,000; owner distributions take $100,000, leaving $850,000 of adjusted cash flow. Existing equipment and vehicle debt service consumes $500,000 a year. The company requests a $500,000 line; fully drawn at pricing typical of a secured facility — call it 10% for this illustration only — the line's annual cost is about $50,000. Total debt service: $550,000. Coverage: $850,000 ÷ $550,000 = 1.55x, comfortably above a 1.25x floor.
The file supports a $500,000 line: within the borrowing base, above the coverage floor, and structured with monthly certificates so the lender can watch the base move. Notice what did the approving — 1.55x coverage, a base that exceeds the request, and reporting that keeps the lender comfortable. Notice what almost killed it: the concentration excess on the largest customer, resolved before submission rather than after. That sequencing, fix first and apply second, is the entire game at this scale. Your own figures will differ, and the pricing you are quoted depends on your collateral, credit, and structure; the method is what any lender will run with you. And for a growing company, the exercise is worth repeating annually: numbers move, bases move, and the limit conversation is never really finished.
None of these numbers is a verdict; they are inputs, and how they combine is what a lender actually reads. If you want to see how your five numbers pencil out, bring them to our team at Tesni, LLC and we will run the calculation on your file.