How lenders calculate DSCR, and what number you actually need

If you learn one number before you talk to a bank, learn this one. Debt service coverage decides more files than credit scores do, and unlike your score you can work it out yourself this evening with your tax returns and a calculator.

Underwriters call it DSCR. It answers one question. After the business pays everything it has to pay, is there enough left to make the loan payment, and how much room is there beyond that.

The arithmetic

Cash available to service debt, divided by total annual debt payments including the new loan.

The numerator is not net income. Net income is what your return shows after depreciation, after interest, and after whatever you paid yourself, and none of those three belong in a coverage number for the reasons below. What an underwriter builds instead is usually called adjusted cash flow, and it starts at net income and adds back:

Depreciation and amortization, because they are accounting entries rather than money leaving the business.

Interest expense, because the numerator is cash flow measured before any financing cost, and every loan that continues past closing already has its whole payment, principal and interest together, charged once in the denominator. Adding the interest back is what stops it being counted twice.

Owner compensation, but only to the extent the business could genuinely operate without it. If you pay yourself $180,000 and a hired manager doing your job would cost $90,000, roughly $90,000 comes back. Underwriters differ on this and it is the single most negotiable line in the calculation.

One-time items, if you can document them. A roof replacement, a legal settlement, a one-off equipment purchase run through the income statement. Documented, not asserted.

The denominator is simpler and less forgiving. It is twelve months of payments on every obligation the business will carry after closing. Term debt, equipment finance, vehicle notes, the interest on a line of credit, capital lease payments, and the annual payment on the new loan. It comes off your debt schedule, cross-checked against your credit report, which is exactly why a missing obligation on that schedule causes so much trouble.

Worked through

A distributor with $2.4 million in revenue. Last year's return shows net income of $118,000. Depreciation was $64,000. Interest was $21,000. The owner took $165,000 in salary and agrees a replacement manager would cost $95,000, so $70,000 comes back.

Adjusted cash flow is $118,000 plus $64,000 plus $21,000 plus $70,000, which is $273,000.

Existing debt: an equipment note at $2,100 a month and a vehicle note at $780, which is $34,560 a year. The new loan is $500,000 over ten years at around 11 percent, roughly $6,900 a month, or $82,800 a year. Total debt service after closing is $117,360.

$273,000 divided by $117,360 is 2.33.

That is a comfortable file. The business could lose more than half its cash flow and still make every payment. In practice an underwriter will also run it on the two prior years, and often on a weighted average that leans on the most recent year, because one strong year against two weak ones is a different story than three steady ones.

Now change one thing. Say the owner will not accept a replacement-manager figure and the full $165,000 stays out. Adjusted cash flow drops to $203,000 and coverage falls to 1.73. Still good. This is why the owner compensation line is worth understanding before someone else decides it for you.

The number you need

There is no single answer, and anyone who gives you one is simplifying something that matters.

Below 1.0 the business does not generate enough to cover its payments. Almost no conventional lender goes there, and collateral rarely changes it, because collateral is a recovery plan and coverage is a repayment plan.

At 1.0 to 1.1 you are technically covered and practically exposed. The SBA's 2026 guidance for 7(a) loans under $350,000 sets the floor at 1.1, meaning the lender must document a debt service coverage ratio of 1.1 or better under the standard small loan screening process (the SBA's 7(a) loan program page). That is a documented program floor, not a target, and hitting it exactly is a thin place to stand.

At 1.15 to 1.25 you are in the range most credit committees are comfortable with. That is roughly fifteen to twenty-five cents of cushion on every dollar of payment, which absorbs a slow quarter without a conversation.

Above 1.5 coverage stops being the question and the file turns on something else, usually collateral, industry, or how long you have been operating.

The right way to hold it: 1.0 is the floor nobody goes below, 1.1 is what the program documents on small 7(a) loans, and 1.15 to 1.25 is what most lenders actually want to see before they are relaxed about it. Where your particular bank sits inside that range depends on its own credit policy, your industry, and how steady the three years look.

Global coverage, which is the one that surprises people

Most owners run the business calculation, get a good number, and stop. The lender does not stop there.

Global coverage puts the business and the household together. It adds your personal income from all sources to the business cash flow, and adds your personal debt payments to the business debt payments. Mortgage, car notes, credit card minimums, student loans, all of it.

This matters because your business obligations are personally backed anyway. A business that covers 1.4 on its own while the owner carries a mortgage and two car payments against a modest draw can come out under 1.0 globally, and the file that looked strong on one page becomes a conversation on the next.

Run both. If the two numbers are far apart, you know exactly where the work is.

What moves it

Coverage is a ratio, so there are only two directions.

Reduce the denominator. Retiring one obligation with an outsized monthly payment relative to its balance moves coverage more than most owners expect, and it moves immediately. A $700 monthly payment on a small remaining balance is $8,400 a year out of the denominator. Refinancing short-term obligations onto a longer term does the same thing without paying anything off, which is often part of why the new loan is being requested.

Increase the numerator. Revenue growth is the honest answer and it takes quarters. Margin improvement is faster and smaller. Documenting a genuine one-time expense from last year is faster still and costs nothing but the paperwork to prove it.

The one thing not to do is present a coverage number built on add-backs you cannot support. Underwriters see optimistic add-backs constantly. An add-back you cannot document does not lift your ratio, it lowers your credibility, and that costs more than the ratio would have gained.

Run yours

Pull your last return, add back depreciation, amortization, interest, and the portion of your compensation the business could operate without. Total the annual payments from your debt schedule, add the new loan payment, and divide.

If you would rather have it done for you alongside everything else a lender looks at, you can check your lendability in about three minutes. Fifteen questions, no credit pull. It gives you a coverage read, a realistic date for the money, and the first thing to work on. It is an educational estimate, not a credit decision, but it is built on the same arithmetic above.

Zero2Ten LLC provides software and educational tools for small business owners preparing for financing. Zero2Ten is not a lender, does not broker loans, does not make credit decisions, and does not guarantee loan approval or terms. Lendability results are educational estimates based on information you provide and are not loan offers, credit decisions, or pre-approvals. Any lender introduction is at your request and lenders make independent decisions under their own criteria.