How DSCR is calculated on a Connecticut rental

The formula, and why the denominator does the damage

Debt service coverage ratio is a single division: rent on top, payment underneath. What separates a useful estimate from a fantasy is how much of the payment you put in the denominator. Investors who test a deal with principal and interest alone will almost always find that the property “covers itself”. It usually does — until the tax bill and the insurance premium arrive.

Lenders use a combined figure usually called PITIA: principal and interest, property tax, insurance, and association dues, with flood insurance added when the property sits in a mapped zone and mortgage insurance added if a program charges it. Every one of those components is real money leaving the property every month, and every one of them belongs under the line. A ratio built on a partial payment is not conservative; it is wrong in a direction that flatters the deal.

That matters more in Connecticut than in many states because the two largest non-mortgage components — property tax and insurance — are unusually variable from one town to the next. Two identical three-family buildings with the same rent and the same loan amount can produce ratios that differ by a meaningful margin simply because one sits in a town with a much higher mill rate or a coastal insurance load.

Step one: the rent figure a lender will actually use

For an occupied property, the rent is the lease in place, subject to the lender’s rules on lease terms and the appraiser’s review. For a vacant property or a purchase where the seller’s tenants are leaving, the rent comes from a market rent analysis the appraiser supports, sometimes delivered as a form 1007 rent schedule or its equivalent.

Here is where investors routinely overestimate. A seller’s pro forma is not rent; it is a wish with a spreadsheet. If three units are leased at below-market figures and the seller projects market rent after a turnover, the lender will underwrite the leases. If one unit is an attic conversion the town does not recognize, the appraiser may exclude it entirely. If the property is a short-term rental, the income assumption depends on whether the program accepts platform revenue or an appraiser’s projection, and many programs use long-term market rent instead.

The practical rule: underwrite the rent you can document today, and treat the increase as upside you have not yet earned. A deal that only works after a planned rent bump is a deal that has to survive a year of carrying costs before it works at all.

• Occupied: signed leases plus the rent roll, with deposits accounted for
• Vacant at purchase: appraiser-supported market rent, not the listing sheet
• Short-term rental: platform statements or an appraiser analysis, and only where the program allows it
• Mixed use: each unit documented separately, with legal use confirmed

Step two: property tax, modeled from the parcel

Connecticut property tax is municipal. The assessor places a value on the grand list, and the town applies a mill rate to that value. A revaluation resets assessments on a cycle, and the town’s mill rate reflects its own budget decisions. The consequence for underwriting is simple: the number on the seller’s listing sheet may be last year’s bill, a phase-in of an older assessment, or a figure the seller rounded in a hopeful direction.

Pull the actual bill from the town’s assessment database and confirm which assessment year it reflects. On a three-family in a city with a heavy mill rate, a revaluation that raises the assessed value by a meaningful margin can add enough to the monthly payment to push the ratio below a program floor. That is not a hypothetical risk; it is the most common way a Connecticut deal comes in thinner than the investor projected.

If the property has been improved without permits, or if a prior owner received a local tax abatement, the current bill may not represent what you will owe. Ask the assessor’s office directly. A five-minute phone call is cheaper than discovering the difference after closing.

Step three: insurance, quoted for the address

Insurance is the line investors most often guess at and the one that punishes guessing hardest. In Connecticut the exposure splits into two broad categories: coastal wind and flood, and old-building condition. A shoreline property in Fairfield County may carry flood and wind costs that dwarf the tax difference between towns. An inland three-decker may be cheap to insure in theory but expensive in practice because the carrier wants the knob-and-tube wiring replaced or the roof certified before it will bind.

Get a quote on the specific address. Not a comparable house, not a town average, not an agent’s rule of thumb. Ask what the carrier assumes about occupancy, whether flood is included or excluded, what the wind deductible is, and what conditions apply before coverage takes effect. Those conditions become closing conditions when the lender needs a policy in force at funding.

A realistic model uses the quoted annual premium divided by twelve. If the property is in a mapped flood zone, add the flood premium and ask for the elevation certificate — the difference between an elevated structure and a low one can be dramatic and it is not something you can estimate from the address alone.

Step four: run the division, then interpret it honestly

Add the monthly components, divide the rent by the total, and look at the number without flattering it. At 1.00 the property exactly covers its payment. Above 1.00 there is a cushion. Below 1.00 the owner is subsidizing the property every month, and only a narrower set of programs will consider that file — usually with stronger credit, more equity, or larger reserves.

The interpretation matters as much as the arithmetic. A ratio of 1.05 on a 1920s triple-decker with a twenty-year-old roof is not the same risk as a ratio of 1.05 on a renovated property with a new heating plant. The ratio describes the rent relative to the payment; it says nothing about the capital needs of the building, the strength of the tenant base, or the direction of the local rental market. Underwriters know this, which is why the ratio is a gate rather than the whole decision.

A useful habit is to stress the deal: what happens to the ratio if the tax bill rises after revaluation, if insurance reprices at renewal, or if one unit sits vacant for two months. If the deal only survives in the best case, it is not a DSCR deal with a thin cushion; it is a speculative purchase with a mortgage attached.

Where Connecticut investors get the inputs wrong

Three errors recur. The first is using a purchase-price percentage to estimate taxes instead of pulling the actual bill. The second is insuring at an owner-occupied rate and assuming the premium will not change once the property is rented — carriers reprice for occupancy, and a policy written for the wrong use can be voided at claim time. The third is forgetting association dues on a condo or a unit in a planned community, which can be a substantial monthly figure that belongs in the denominator.

A fourth, subtler error is ignoring the cost of the financing itself. Points, lender fees and closing costs are not part of the ratio, but they are part of the deal, and a program with slightly better pricing and a prepayment penalty can cost more than a program with a slightly higher rate and no penalty if you plan to refinance or sell within a few years.

What we do with your numbers

Send us the address or town, the unit count, the rent you can document, the purchase price or current value, and the loan amount you have in mind. We will run the ratio on realistic tax and insurance figures for that specific property, then tell you which program shapes look workable and which parts of the file are most likely to become conditions.

That is a scenario review, not an approval. It is also the cheapest possible way to find out that a deal does not work — before an appraisal fee, an inspection, or a signed contract makes the answer expensive. Loan Daddy LLC is a mortgage broker; we arrange and shop financing from wholesale lenders and do not issue credit ourselves. Business-purpose, non-owner-occupied investment property only.