DSCR is rent ÷ full PITIA — principal, interest, taxes, insurance, and association dues — not rent ÷ mortgage payment. Underwriting builds PITIA from the tax certificate, a real insurance binder, and the HOA cert. If you priced the deal on Zillow's tax figure and the seller's old premium, expect your ratio to drop when the real numbers land. Verify all three before you write the offer.
Here's the pattern I see more than any other when a DSCR deal falls apart: the investor ran the numbers, the numbers looked great, and then underwriting "changed" them. Except underwriting didn't change anything. The investor computed DSCR with the rent and the principal-and-interest payment, penciled in whatever Zillow said for taxes, borrowed the seller's insurance premium, and forgot the HOA existed.
Then the tax certificate, the insurance binder, and the HOA cert showed up — and a deal that penciled at 1.20 came back at 0.97.
Nobody moved the goalposts. The goalposts were always PITIA: Principal, Interest, Taxes, Insurance, Association dues. The P and I are the easy part — any mortgage calculator gets you within a few dollars. It's the T, the I, and the A that kill deals, because those are the numbers investors guess at and underwriters verify.
This article is about closing that gap before it costs you an appraisal fee, a rate lock, and three weeks of escrow.
Your Numbers vs. Underwriting's Numbers
The core problem is that you and the underwriter are pulling the same line items from completely different sources:
| PITIA Component | Where Investors Get It | Where Underwriting Gets It |
|---|---|---|
| Principal & Interest | Mortgage calculator | The actual locked rate and loan amount |
| Property Taxes | Zillow / the listing / seller's last bill | Tax certificate from title — and, on many files, an estimate of the post-sale reassessed amount |
| Insurance | Seller's legacy premium, or a round guess | An actual insurance binder for a landlord policy, priced today, with all required coverages |
| HOA Dues | Often forgotten entirely | HOA certification — dues, budget, pending special assessments |
| Rent | Listing claims, optimistic comps | Executed lease or the appraiser's Form 1007 rent schedule — lower of the two |
On every line, the underwriter's source is equal to or worse for your ratio than yours. That's not the lender being difficult — it's the difference between marketing numbers and documented numbers. The three killers, one at a time:
The T: Post-Sale Tax Reassessment
The seller's tax bill reflects the seller's world — their assessed value, their exemptions, their purchase price from years ago. The moment you close, most of that dies with the deed.
The mechanics vary by state, but the trap is the same everywhere: if you're paying meaningfully more than the value the county has been taxing, the tax bill is coming up to meet your price. A few directional examples every investor should know:
- California: Prop 13 caps how fast assessed value grows while an owner holds — and resets it to market value at sale. Buy from someone who's owned since 2009 and your assessed value can be double or triple theirs — and a supplemental tax bill shows up mid-year to collect the difference. Zillow shows the seller's bill, not yours.
- Florida: Same movie, different name — the Save Our Homes cap keeps a long-term owner's assessment artificially low, and it resets at transfer. On top of that, the seller's homestead exemption disappears the day an investor takes title.
- Texas: High property taxes generally, and the seller's bill often reflects a homestead exemption and an appraisal cap you won't get on an investment property. Texas is a non-disclosure state, but appraisal districts reassess annually and they're not naive about market values.
Here's the part that stings: some lenders qualify off the current tax certificate, others off an estimated post-sale figure. If your file happens to squeak through on the old bill, you didn't dodge the problem — you just deferred it to yourself. The county catches up, your impound account gets analyzed, and your monthly payment jumps to cover the shortfall. Underwrite yourself at the real number even when the lender doesn't make you.
How to get the real tax number in ten minutes
- Find the parcel on the county assessor or appraisal district website.
- Pull the actual tax rate for that parcel — not a state average.
- Apply the rate to your purchase price, not the seller's assessed value.
- Strip out any homestead, senior, or owner-occupant exemptions on the current bill. You get none of them.
The I: Your Insurance Quote Is Not the Seller's Premium
The seller's premium is a historical artifact. It reflects a policy written years ago, at legacy pricing, often with owner-occupant coverage, sometimes with a carrier that wouldn't write the same house today. You need a landlord policy priced this month, and the gap between those two numbers has gotten wide — especially in coastal markets where wind and flood pricing has repriced dramatically over the past few years.
Where new quotes come in high:
- Coastal wind exposure. Florida, the Gulf Coast, coastal Carolinas — carriers have pulled back and repriced. The seller's grandfathered premium tells you nothing about what a new policy costs.
- Older roofs. A roof past a certain age can mean surcharges, actual-cash-value-only roof coverage, or flat declines from preferred carriers. A 17-year-old roof is an insurance problem before it's a maintenance problem.
- Short-term rentals. A standard landlord policy generally doesn't cover STR use. You need an STR endorsement or a specialty policy, and it costs more. If you're underwriting an Airbnb on a long-term-rental insurance guess, your I is wrong twice.
- Lender-required coverages. Replacement-cost coverage with the lender as mortgagee, plus — commonly — loss-of-rent coverage. These aren't optional, and they're not in the seller's declarations page.
The fix is boring and cheap: get a real quote from an agent during due diligence, on the correct policy type, with the coverages your lender will require. It costs you a phone call. Skipping it can cost you the deal in week three.
The A: HOA Dues and the Special Assessment You Didn't See
Association dues go straight into PITIA, dollar for dollar. On a condo, $350/month in dues does exactly as much DSCR damage as $350/month in taxes — and investors reliably model the taxes while forgetting the dues.
Underwriting orders an HOA certification, and it surfaces things the listing didn't mention: the actual current dues, pending or recently passed special assessments, budget shortfalls, and litigation. Post-Surfside, condo associations across the country have been forced to fund reserves and deferred maintenance properly, and the money comes from owners — as higher dues, special assessments, or both.
Request the HOA docs — budget, meeting minutes, reserve study if there is one — early in due diligence, not the week of closing. Meeting minutes are where future assessments live before they become line items.
The Flood Zone Surprise
If the property sits in a FEMA Special Flood Hazard Area — zones like AE or VE — flood insurance isn't a suggestion, it's a federal requirement on the loan, and it's a real monthly number inside your I. Two ways this ambushes people:
- The investor never checked the map. FEMA's Flood Map Service Center is free and takes two minutes per address.
- The maps changed. A property that wasn't in a flood zone when the seller bought can be in one now — the seller not carrying flood insurance proves nothing about your requirement.
A Worked Example: The Deal That Passes, Then Fails
Round, illustrative numbers. Purchase price $400,000, 75% LTV, $300,000 loan, 30-year fixed, P&I roughly $2,000/month. Market rent $2,900.
The investor's math (seller's numbers)
- Rent: $2,900
- P&I: $2,000 · Taxes (Zillow, seller's bill): $250 · Insurance (seller's premium): $100 · HOA: "didn't see one"
- PITIA: $2,350 → DSCR = 2,900 ÷ 2,350 = 1.23 — comfortably approved, decent pricing tier
Underwriting's math (documented numbers)
- Rent: $2,900 (Form 1007 confirms the lease)
- P&I: $2,000 · Taxes (estimated post-sale, no exemptions): $500 · Insurance (landlord binder, wind included): $280 · HOA (cert): $150
- PITIA: $2,930 → DSCR = 2,900 ÷ 2,930 = 0.99 — below 1.0, repriced or restructured
Same property. Same rent. Same loan. The T went from $250 to $500 because the seller bought a decade ago with a homestead exemption. The I nearly tripled because a current landlord policy with wind coverage is not a 2015 owner-occupant policy. And there was an HOA after all. The ratio fell 24 points and crossed the one line that matters.
The deal isn't dead — but now you're restructuring under deadline
A sub-1.0 DSCR usually means repricing, not rejection. The standard rescues:
- Lower the LTV. Drop to 70% ($280,000 loan) and P&I falls to roughly $1,865. PITIA becomes $2,795 and DSCR climbs back to about 1.04.
- Buy the rate down. Points upfront for a lower payment. Works, but the points are real cash at closing.
- Interest-only. An IO payment on the same $300,000 loan drops the qualifying payment by a couple hundred dollars a month and can lift this file back over 1.0. You're trading amortization for coverage — a legitimate tool, not a free lunch.
- Sub-1.0 programs. Ratios down to 0.75 can be financed with rate add-ons and strong compensating factors — but you'll pay for the coverage you don't have.
Every one of those options exists before you offer, too — when you can negotiate price instead of scrambling for cash. That's the whole argument for doing this work early.
The Pre-Offer PITIA Verification Checklist
Do these four things before you write the offer
- Taxes: Pull the parcel's actual tax rate from the county site. Apply it to your purchase price, exemptions stripped. In reset states (CA, FL, and functionally most others when the price jump is big), assume the bill follows your price, not the seller's history.
- Insurance: Get a real landlord-policy quote during due diligence — correct policy type, wind/flood if applicable, loss-of-rent, STR endorsement if it's a short-term rental. Do not underwrite off the seller's premium.
- HOA: Request the cert, budget, and meeting minutes early. Confirm current dues and hunt for special assessments that haven't hit the listing data yet.
- Flood: Check the FEMA flood map for the address. If it's in an SFHA, price flood coverage into the I before you fall in love with the deal.
Then run the ratio at those numbers — our DSCR calculator takes the full PITIA, not just P&I. If the deal only works on the seller's numbers, the deal doesn't work. Better to know that on day two than in week three.
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Related Guides
- How to Calculate Your DSCR Ratio (With Examples)
- 2026 DSCR Loan Requirements
- DSCR Loans in Florida — where insurance math matters most
- State of DSCR Lending 2026 — Our Funded-Loan Data
Glossary & Tools
- PITIA · Flood Zone · Impound Account · Form 1007
- DSCR & Mortgage Calculator — run the ratio on full PITIA
DSCR Capital Partners is a brand of UTM Financial, LLC (NMLS #2591548), a licensed mortgage broker. Informational only; not a loan commitment. Worked examples use illustrative round numbers, not quotes. Tax and insurance commentary is general in nature — verify figures for your specific property and jurisdiction. Equal Housing Lender.