You can have $10 million in revenue, a profitable P&L, and a decade of operating history. If your debt service coverage ratio falls below the bank's threshold, you're not getting that loan. DSCR is the metric that separates businesses that can borrow from businesses that can't—and most owners don't think about it until they're sitting across from a lender hearing "no."
What DSCR actually measures
The formula is simple: Net Operating Income ÷ Total Debt Service = DSCR
Net operating income is your EBITDA (or a variation of it, depending on the lender). Total debt service is all principal and interest payments on your debt for the period.
A DSCR of 1.0 means you generate exactly enough cash to cover your debt payments. Nothing left over. No margin for error.
Most lenders want to see 1.20 to 1.35 minimum, depending on the industry and loan type. Commercial real estate loans often require 1.25. Equipment financing might accept 1.15. SBA loans typically want 1.15 or higher.
That spread matters. A 1.25 DSCR means for every $1.00 in debt payments, you're generating $1.25 in operating cash flow. That extra $0.25 is the cushion that lets lenders sleep at night.
Why banks obsess over this number
Revenue doesn't repay loans. Profit on paper doesn't repay loans. Cash flow repays loans.
DSCR strips away the noise and answers one question: Can this business actually make the payments?
A construction company might show $500,000 in net income, but if they're carrying heavy equipment debt and a line of credit, that profit might not translate to enough cash to service everything. DSCR exposes that gap.
Banks also use DSCR covenants in loan agreements. You might close the loan with a 1.30 DSCR, but the covenant requires you to maintain 1.15 going forward. Drop below that, and you're in technical default—even if you've never missed a payment. That gives the bank leverage to renegotiate terms, demand additional collateral, or accelerate the loan.
How to calculate yours before the bank does
Pull your trailing twelve months of financials and work through this:
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Calculate Net Operating Income: Start with EBITDA. Some lenders add back owner compensation above market rate, one-time expenses, or non-cash charges. Ask your lender how they calculate it—they'll tell you.
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Total up Annual Debt Service: Every loan payment, every lease payment (if it's a capital lease), every line of credit with required monthly payments. Principal plus interest, annualized.
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Divide: NOI ÷ Debt Service = DSCR
Here's a real example: A manufacturing company has $1.2 million in EBITDA. They're carrying $650,000 in annual debt service across equipment loans and a term note. Their DSCR is 1.85—healthy, with room to take on additional debt if needed.
Compare that to a real estate investor with $180,000 in NOI and $160,000 in mortgage payments. Their DSCR is 1.125—barely above the threshold. One bad quarter, one vacancy, and they're in covenant trouble.
What to do when your DSCR falls short
If you're below the threshold, you have three levers:
Increase net operating income. This is the hard one, but it's the real fix. Better margins, more volume, cutting overhead. Every dollar of EBITDA improvement flows directly to DSCR.
Reduce debt service. Refinance to extend terms, negotiate lower rates, or pay down principal to reduce required payments. A $500,000 loan over 5 years requires more annual debt service than the same loan over 7 years.
Time the measurement. If you're applying for a loan during a down quarter, wait if you can. DSCR is calculated on trailing performance—a few strong months can move the needle.
Some lenders will also accept a global DSCR that includes owner income outside the business, or they'll look at projections for newer companies. But those conversations go better when you know your numbers cold before walking in.
Where to start
Run your DSCR calculation today, even if you're not applying for a loan. Know where you stand, know what's dragging it down, and know what it would take to improve it. When opportunity shows up—a competitor's assets for sale, a real estate deal, new equipment—you'll already know whether the financing is realistic.
At Laverton Advisory, we help business owners understand their numbers before they matter most. If you want to know where you stand with lenders, that's a conversation worth having.
Derek Hammock is a CPA and fractional CFO at Laverton Advisory. He works with founder-led businesses to build the financial clarity they need to make better decisions.