Taxes and Insurance Are Half Your Texas DSCR Ratio

Published 2026-09-13 · Aiden Fahimi, Frisco, TX

You ran the numbers before you made the offer. Market rent covers the mortgage with something left over. Then the lender's worksheet comes back and the ratio is thinner than you expected — sometimes under the line entirely. Nothing about the rent changed. What changed is that the lender counted the whole housing payment, and in Texas the parts that are not principal and interest carry unusual weight.

That gap between your math and the underwriter's math is worth understanding before you sign anything, because once you see where the pressure comes from, you can also see which loan structures relieve it.

What the ratio actually divides

Debt service coverage ratio compares the property's rental income to the property's full debt service. The numerator is rent — either the lease in place or the appraiser's market rent opinion, whichever the program calls for. The denominator is not just the note payment. It is principal, interest, taxes, insurance and any HOA dues. In most of the country the tax and insurance portion is a modest passenger riding along behind the loan payment. In Texas it is frequently a co-driver.

Texas has no state income tax, and local jurisdictions fund themselves through property taxes accordingly. On a rental in Dallas-Fort Worth or Houston, the annual tax bill can be a meaningful fraction of the total annual carry. Layer on hazard insurance — which in the Gulf Coast half of the state also has to contend with wind, hail and named-storm exposure — and you have two line items that together can rival the loan payment itself for size. The ratio is sensitive to them in a way that surprises investors who learned the formula somewhere with cheaper carrying costs.

The two numbers that move most between offer and underwriting

Both escrow inputs have a habit of changing after you've already committed to a price.

• The tax figure is forward-looking, not historical. A property that was owner-occupied carried a homestead exemption and the assessment caps that come with it. Once it becomes a rental in your name or your entity's, those protections fall away. Underwriting generally wants the tax number you will actually pay, not the number the seller paid. A newly built house in a growth corridor is the other version of this problem: the first assessment may reflect a bare lot, and the next one will not.
• The insurance quote is the one you actually bind. Deductible structure, wind and hail treatment, and whether you carry loss-of-rents coverage all move the premium. A high-deductible policy lowers the escrow figure and improves the ratio on paper while shifting real risk onto your balance sheet. That is a legitimate trade, but it should be a deliberate one, not an accident of whichever quote came back first.

These are also the two items most likely to quietly sink a file late in the process. If you want the wider list of what goes wrong at that stage, the things that kill Texas DSCR deals at underwriting covers the rest of the pattern.

Why "rent equals payment" is the beginner's version of DSCR

The single most common misunderstanding I run into is that DSCR is one product with one test: does rent cover the payment, yes or no. That framing is useful for about ten minutes and then it starts costing people deals.

DSCR is a category, not a product. Within it there are structures built for exactly the escrow-heavy situation Texas creates:

• Interest-only DSCR reduces the debt service side of the fraction during the interest-only period. Where taxes and insurance are doing the damage, this is often the structural answer rather than hunting for a cheaper property.
• Sub-1.0 DSCR programs exist precisely because a ratio below break-even is not automatically a bad asset. A house in a strong submarket with a heavy tax bill can be a sound investment and still fail a 1.0 test. That program is designed for it.
• Short-term rental DSCR uses a different income basis entirely, which changes how the same escrow figure lands.
• Portfolio DSCR tests across a group of properties, so one tax-heavy door does not decide the outcome alone.
• Cash-out refinance, entity-vested and jumbo DSCR each have their own ratio behavior worth knowing before you assume the answer.

Houston deserves a particular note here, because coastal insurance pricing and tax rates interact differently than they do inland. The structural choices that follow from that are worth reading in the Houston-specific breakdown of insurance, tax and structure.

Running the ratio yourself before you commit

Do this early, while you can still walk or renegotiate:

1. Pull the county's current assessed value and rate, then estimate forward without any exemption the seller may have held.
2. Get a real insurance quote on the actual address, with the deductible you intend to carry.
3. Add both to a realistic principal-and-interest figure, plus any HOA dues.
4. Divide the defensible rent — a signed lease or a supportable market opinion — by that total.

Whatever comes out, bring it to the conversation rather than the property alone. If the ratio is thin, that is a structuring question, not a verdict. And if you are still deciding whether the file belongs in DSCR at all, the comparison against non-QM is the right place to start.

What to do next

Send the address, your rent assumption, and the insurance quote if you have one. I will run the ratio against the DSCR structures that actually fit the numbers instead of the one everyone assumes exists. Aiden Fahimi, NMLS 1943973, Expo Lending LLC, NMLS 2619446, 400 Stonebrook Pkwy Ste 102, Frisco, TX 75036. Call (346) 214-2030 or email hello@expolending.com. Persian-speaking investors across Dallas-Fort Worth and Houston are welcome to have this conversation in Farsi.