DSCR is the number that decides whether your SBA loan gets approved. Lenders run it before they run almost anything else. It's the first filter, and if you fail it, the rest of your deal package doesn't matter.
Most buyers hear "Debt Service Coverage Ratio" and assume it's complicated. It isn't. The math is one division problem. What trips people up is understanding what goes into each side of that equation, and where deals quietly fail before anyone notices.
This article explains DSCR from the ground up: the formula, the thresholds, a step-by-step worked example, and the mistakes that cause deals to look fine on paper until someone runs the actual numbers.
The DSCR Formula
DSCR = SDE ÷ Annual Debt Service
That's it. Two inputs. One output. A DSCR of 1.5x means the business generates $1.50 in earnings for every $1.00 of annual debt payments. A DSCR of 0.9x means it generates $0.90, which means it can't cover its own debt.
Before the formula can be useful, you need to know exactly what each component means, because both SDE and "annual debt service" have definitions that matter.
What is SDE?
SDE stands for Seller's Discretionary Earnings. It's the total financial benefit to a full-time owner-operator running the business. SDE starts with net profit and adds back:
- Owner's salary and compensation
- Owner benefits (health insurance, retirement contributions, vehicle)
- Non-cash expenses (depreciation, amortization)
- One-time or non-recurring expenses (a one-time legal settlement, for example)
- Interest expense on existing debt being retired at close
The purpose of these add-backs is to normalize earnings to what a new owner would actually earn. If the current owner pays himself $200K/year and you'd run the business yourself for less, that $200K comes back into the SDE figure.
SDE is used for main street businesses, typically those under $2M to $3M in enterprise value where the owner is active in the business. Larger businesses typically use EBITDA instead, which doesn't add back owner compensation because those businesses have professional management layers. If you're looking at owner-operated small business acquisitions, SDE is your number.
What is Annual Debt Service?
Annual debt service is the total of all loan payments you'll make in a year on the acquisition financing. For a typical SBA deal, this means two components:
- SBA loan payments. Your primary acquisition loan at SBA 7(a) rates (approximately Prime + 2.75%, around 10% to 10.5% as of early 2026) over a 10-year term.
- Seller note payments. If the seller is carrying back a portion of the purchase price as a note (common in SBA deals), those payments count too. The SBA requires seller notes to be on standby (meaning no principal payments during the first 24 months) but interest typically still accrues.
Many buyers forget the seller note when calculating debt service. This is how deals that "look fine" end up with a DSCR that doesn't clear the SBA minimum.
Run the DSCR math on any deal in seconds
The free SBA calculator handles the full loan structure: SBA payment, seller note, DSCR, and cash required at closing.
Open the calculator →DSCR Thresholds: What the Numbers Mean
Not all passing DSCRs are created equal. Here's how to interpret where a deal lands:
Below 1.0x: The deal can't cover its debt
The business generates less cash than its annual debt obligations. Walk away. No SBA lender will touch this, and the underlying math tells you that even without debt service, the business wouldn't survive its own loan payments. If you're seeing this, either the asking price is too high, the SDE is overstated, or both.
1.0x to 1.25x: Below SBA minimum
The business covers its debt, but barely. The SBA requires a minimum of 1.25x, so this range doesn't get approved. There's also no meaningful cushion: any revenue dip, unexpected expense, or slow month puts you in negative cash flow territory. Even if you could structure around SBA requirements, this is a fragile deal.
1.25x to 1.5x: Meets SBA minimum (tight)
This passes SBA underwriting, but there's limited margin for error. You're covering debt service, but after paying yourself a reasonable salary, there may not be much left. Lenders will approve this if everything else is clean. You should think carefully about whether the cushion is sufficient given the specific business risks.
1.5x to 2.0x: Comfortable
This is where most well-structured SBA deals land. You're covering debt service, paying yourself, and generating enough excess to handle the unexpected. Lenders are comfortable here. You should be too.
2.0x and above: Strong
Significant cash flow cushion. The business earns twice its debt obligations. At this level, you have real flexibility for owner compensation, working capital reserves, and reinvestment. Deals with DSCR above 2.0x are either priced below market or genuinely exceptional businesses.
Step-by-Step Worked Example
Let's run a real deal through the math so the formula stops being abstract.
Deal parameters
- Asking price: $1,500,000
- SDE: $450,000
- Down payment: 10% = $150,000
- Seller note: 10% = $150,000 at 6% interest, 5-year term
- SBA loan: $1,200,000 at 10.5%, 10-year term
Step 1: Calculate SBA loan payment
Using the standard amortization formula at 10.5% over 10 years on $1,200,000:
Monthly SBA payment is approximately $16,260/month, which works out to roughly $195,100/year.
Step 2: Calculate seller note payment
$150,000 at 6% over 5 years:
Monthly seller note payment is approximately $2,900/month, which works out to roughly $34,800/year.
Step 3: Total annual debt service
$195,100 + $34,800 = $229,900/year
Step 4: Calculate DSCR
DSCR = $450,000 ÷ $229,900 = 1.96x
This deal is strong. It clears the SBA minimum comfortably, leaves real cash flow after debt service, and has meaningful cushion against revenue softness. At 3.3x SDE multiple ($1.5M ÷ $450K), the price is also reasonable for a stable business.
After debt service, the owner has $220,000/year in cash flow before taking a salary. That's the number that actually matters for the buyer: what stays in your pocket after the bank and the seller are paid.
How Deal Structure Affects DSCR
DSCR isn't fixed. The same business at the same price can produce very different DSCR numbers depending on how you structure the deal. The two levers that matter most:
Down payment percentage
A larger down payment reduces your SBA loan amount, which reduces your monthly payment, which improves DSCR. Here's what that looks like on the same $1.5M deal:
- 10% down ($150K): SBA loan = $1.2M, annual SBA payment is approximately $195,100, DSCR is approximately 1.96x.
- 15% down ($225K): SBA loan = $1.125M, annual SBA payment is approximately $182,900, DSCR is approximately 2.06x.
- 20% down ($300K): SBA loan = $1.05M, annual SBA payment is approximately $170,700, DSCR is approximately 2.18x.
The improvement is meaningful, but so is the tradeoff: more cash at closing. If you're at the edge of approval, a bigger down payment can get a deal done. But don't over-inject equity if it leaves you without working capital reserves.
Seller note percentage
Seller notes are often misunderstood. A larger seller note reduces your SBA loan (which reduces the SBA payment) but it adds seller note payments. The net effect on DSCR depends on the relative interest rates.
Because seller note rates are typically lower than SBA rates (6% vs. 10.5%), a larger seller note usually improves DSCR slightly. But the improvement is modest. Don't rely on seller note structuring to rescue a deal that fundamentally doesn't pencil.
Buyer Compensation: The Adjustment Most Buyers Miss
SDE represents the total benefit to a full-time owner. If you're replacing the current owner and plan to pay yourself a salary from the business, that salary reduces the cash available for debt service.
This is the buyer compensation adjustment, and it's where a lot of deal models break down.
Example: You're buying a business with $450K SDE. You plan to run it full-time and take a $120K salary. The adjusted SDE for DSCR purposes is $450K minus $120K, or $330K.
Running the same deal with adjusted SDE:
DSCR = $330,000 ÷ $229,900 = 1.44x
Still passes SBA minimum at 1.25x, but the cushion shrinks considerably. And if your target salary was $180K, the adjusted SDE drops to $270K, DSCR falls to 1.17x, and the deal doesn't get approved.
Model your compensation assumptions before you fall in love with a deal. SDE looks impressive until you subtract what you actually need to live on.
Common DSCR Mistakes
Using EBITDA instead of SDE
For small businesses where the owner is active, SDE and EBITDA can differ significantly. EBITDA doesn't add back owner compensation. If a broker presents EBITDA for a business where the owner earns $200K/year and works full-time, you're looking at an understated cash flow number. Ask specifically for SDE and the add-back schedule.
Forgetting the seller note payment
The seller note goes into the debt service denominator. If you run DSCR using only the SBA payment, your number will look better than it actually is. Every buyer who has done this has been surprised when their lender runs the real math.
Not accounting for buyer compensation
If you're replacing a full-time owner, the salary you need to live on reduces available SDE. Run the math with your realistic compensation assumption, not with raw SDE.
Ignoring working capital needs
DSCR measures cash flow against debt payments. It doesn't account for the cash you need to operate the business between collecting receivables and paying payables. A business can have a strong DSCR and still run into cash flow trouble if you close with no working capital reserve. The SBA allows working capital to be included in the loan. Use it.
Relying on projected SDE, not historical
Lenders underwrite based on historical SDE, typically averaged over 2 to 3 years. A seller who projects strong future earnings is telling a story. The bank needs evidence. If the last three years show $450K, $380K, $290K (declining), the lender will likely weight toward the more recent figures. Run DSCR on the trailing 12 months and on the 3-year average to see the range.
Worked Example: A Deal That Doesn't Pass
Same structure, different price point, to show what failure looks like.
- Asking price: $2,000,000
- SDE: $400,000
- Multiple: 5.0x (the first warning sign)
- Down payment: 10% = $200,000
- Seller note: 10% = $200,000 at 6%, 5 years
- SBA loan: $1,600,000 at 10.5%, 10 years
Monthly SBA payment is approximately $21,700, annual approximately $260,100.
Monthly seller note is approximately $3,866, annual approximately $46,400.
Total annual debt service is approximately $306,500.
DSCR = $400,000 ÷ $306,500 = 1.31x
Technically above the 1.25x floor. But now subtract $120K buyer compensation:
Adjusted SDE = $280,000
DSCR = $280,000 ÷ $306,500 = 0.91x
The deal fails. The business can't cover its debt payments after you pay yourself a reasonable salary. And at 5.0x SDE, this is a price that reflects peak optimism, not acquisition math.
The math doesn't lie. "This looks great until you run the DSCR."
Try It Yourself
The free SBA loan calculator runs all of this automatically. Enter the asking price, SDE, down payment percentage, seller note terms, and your compensation assumption, and it outputs the full loan structure, DSCR, and cash required at closing.
Run every deal you're seriously considering through it before you invest more time. The calculation takes 90 seconds. Discovering a deal fails at the LOI stage takes months.
For the full SBA loan mechanics (how rates are set, eligibility requirements, and the application process) read the SBA 7(a) loan guide. For deal valuation methodology and what multiples mean, see how to value a small business.
And if you're still building the fundamentals of the acquisition process, the complete guide to buying a small business covers the full journey, from defining your criteria to closing day.