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Debt service coverage, explained with the actual arithmetic

By Klark Sparks  ·  September 14, 2026  ·  7 min read

The short answer

Debt service coverage compares the cash your business generates against the debt payments it would owe. Lenders want a cushion above one, not a break-even. It is the most common reason a profitable-feeling business gets declined, and the usual fix is documenting legitimate add-backs rather than changing the business.

Part of our guide to Term Loans — what it is, what it costs, and who it suits.

Not sure this is the right product at all? The Idaho small business funding guide covers every option an Idaho business has.

If a lender declines you with a vague reference to credit criteria, this is usually the number they mean. It is worth understanding because it is calculable in advance, and knowing it before you apply changes what you ask for.

The calculation

In plain terms: cash available to service debt, divided by the debt payments due. A result of 1.0 means the business generates exactly enough to make its payments and nothing more. Lenders want a cushion above that — the exact threshold varies by lender, by industry and by how stable the revenue is.

Why a cushion? Because a business at exactly 1.0 has no room for a bad quarter, an unexpected repair or a customer paying late. The margin above 1.0 is the lender’s tolerance for the business having a normal year rather than a perfect one.

An illustration

These figures are made up to show the shape of it, not to suggest any particular threshold or offer.

Say a business shows $80,000 of net income, plus $30,000 of depreciation and $60,000 of owner compensation that a lender agrees to add back. That gives $170,000 of cash available. If existing and proposed debt payments total $100,000 a year, coverage is 1.7 — comfortable almost anywhere.

Take the same business with $150,000 of annual debt payments and coverage falls to roughly 1.13. Still above one, and thin enough that many lenders would decline or reduce the loan size until the payment fits.

Notice what moved: not the business, the payment. Coverage problems are frequently solved by borrowing less or borrowing over a longer term, both of which lower the annual payment. That is often a better conversation than arguing about the income.

Add-backs, and why Idaho businesses need them

Net income on a tax return understates the cash a small business actually generates, often deliberately. Lenders know this and will add certain things back:

  • Depreciation and amortisation, which are accounting entries rather than cash going out.
  • Interest on debt being refinanced, since it is being replaced.
  • Owner compensation above a reasonable market salary for the role.
  • Genuine one-off expenses that will not recur, if you can evidence them.
  • Personal expenses run through the business, where they can be identified and documented.

This matters enormously here, because a great many well-run Idaho businesses minimise taxable income efficiently and then discover their tax return says they earn very little. The income exists. It needs to be found and defended.

Documenting them properly

Every add-back needs evidence. "We ran some personal costs through the business" is not an add-back; a schedule listing them with supporting detail is. A file resting on many undocumented add-backs gets sceptical treatment, and the credit committee is not in the room with you to be persuaded.

Prepare the schedule before you apply, with your accountant if you have one. Volunteered and evidenced reads as competence. Produced reluctantly under questioning reads as something else.

If coverage is the problem

  1. Borrow less, or over a longer term. Both reduce the annual payment directly, and are the fastest fixes available.
  2. Clear small existing debts. Each one consumes coverage out of proportion to its size.
  3. Document add-backs properly. This is often worth more than everything else combined.
  4. Wait for a stronger tax year, if the need can wait. Changing how the business reports income takes a full cycle to show up.
  5. Consider a secured structure. Collateral sometimes buys tolerance on coverage that an unsecured request would not get.

And if the honest answer is that the business genuinely cannot service the debt, that is worth hearing. A lender declining on coverage is telling you the payment would hurt. Sometimes they are right.

Common questions

What coverage ratio do I need?
It varies by lender, industry and how stable your revenue is. Everyone wants a cushion above 1.0; how much varies. Ask the specific lender rather than working from a number you read somewhere.
Does my owner salary count against me?
Not entirely. Lenders typically add back compensation above a reasonable market salary for someone doing your job, on the basis that you could pay yourself less if you had to. Below that level it is treated as a genuine cost.
Can I include income from a business I am buying?
In an acquisition, yes — coverage is generally calculated on the target business’s historical performance, adjusted for the new debt and any changes you can evidence. That is much of why acquisitions underwrite better than startups.
Why did my bank say no when I am clearly profitable?
Most often because the profit visible on the tax return, after aggressive minimisation, does not support the payment on paper. The business is fine; the documentation is working against you. Properly evidenced add-backs are the usual remedy.

Want this applied to your actual numbers?

Reading about it only gets you so far. One short application, a soft credit pull, and a straight answer about what fits.