The most expensive sentence in rental investing is “it cash-flows.” I hear it from first-time buyers every week, and the spreadsheet behind it has rent, a mortgage payment, and a vague line called “expenses.” In Texas that spreadsheet is wrong by several hundred dollars a month, and the gap is almost always the same five costs.
I run the sales side at Diamond and work with investors every day — first-time DFW landlords and out-of-state buyers underwriting a Texas house they will never drive past. This is the walkthrough I give them: the one-minute screen, the five Texas costs that break beginner math, the three numbers that decide a deal, a worked hypothetical, and what a BRRRR refinance really looks like at 2026 rates. It is stage 2 of our new-investor guides. If you have not decided whether you are a flipper or a landlord, read fix-and-flip vs. buy-and-hold in Texas first; this post assumes “hold” and goes deeper on the hold math.
Two things up front. This is operator-side education, not financial, tax, or legal advice — I am not a lender, a CPA, or a licensed broker, and nothing here is a promise of returns. And every deal figure below is hypothetical; I will not publish what Diamond paid a seller or our spread on any property.
The one-minute screen: the 1% rule
The 1% rule says monthly rent should be at least 1% of your total cost — all-in at $225,000, it should rent for $2,250 or more. It is a screen, not a decision: ten seconds, two numbers, and it tells you whether a deal is worth running the real math on.
It is hard to hit in Dallas–Fort Worth as of 2026 because prices outran rents through the early 2020s. A renovated three-bedroom that would sell for $285,000 in an older Tarrant or Dallas County suburb typically leases for $2,100–$2,400 a month — 0.74%–0.84% of value — and the newer Collin and Denton County suburbs are usually worse. DFW investors get to 1% by buying below market: bought off-market for $198,000 and made rent-ready for $22,000, that house carries a $223,500 basis, and $2,300 a month is 1.03%. That is the band investors underwrite to — ARV × 75–80% minus repairs — and the discount to retail is what makes a Texas rental screen at all. It is also blind to taxes: a 1% deal carrying a 2.3% tax bill is materially weaker than one at 0.7%.
The five Texas costs that break beginner math
1. Property taxes — and the exemption you do not get
What matters for a rental is the combined nominal rate — city + county + school district + any special district — applied to the appraisal district’s market value. Approximate combined nominal rates by DFW county, as of 2026:
| County | Approximate combined nominal rate (2026) |
|---|---|
| Dallas County (Dallas, Garland, Mesquite, Irving) | ~2.0%–2.5% |
| Tarrant County (Fort Worth, Arlington) | ~2.0%–2.5% |
| Collin County (Plano, McKinney, Frisco) | ~1.7%–2.2% |
| Denton County (Denton, Lewisville) | ~1.8%–2.3% |
| Any subdivision inside a MUD or PID | add roughly 0.5%–1.0% |
Those are ranges, not quotes — the rate is parcel-specific, so pull the truth-in-taxation estimate for the address from the county appraisal district before you offer.
Now the part beginners miss. Homeowners get two protections: the $140,000 school-district homestead exemption (raised for the 2026 tax year) and the 10% annual cap on appraised-value increases. A rental gets neither. It is taxed at full market value, and the district can move that value up as fast as the market does — which is why the homeowner next door pays an effective rate near 1.6%–1.7% while you pay the full nominal rate. Our 2026 Texas property-tax bill guide covers the changes, the temporary non-homestead cap, and the January 31 deadline that applies to you too.
Budget it at the nominal rate on the post-rehab value, not the purchase price. The district catches a renovated house within a cycle or two, and taxing a discounted purchase price is the most common way a Texas rental pro forma turns out optimistic.
2. Insurance — hail, deductibles, and the roof schedule
North Texas is hail country and the insurance market has repriced accordingly. As of 2026, a landlord policy (a DP-3 form; a standard homeowners policy generally will not cover a non-owner-occupied rental) on a typical DFW three-bedroom runs roughly $2,500–$4,500 a year, with the top of the range for an older roof, prior claims, or a low deductible.
The deductible is where the real math hides. Texas carriers commonly write wind/hail deductibles as a percentage of dwelling coverage — 1%–2% is typical, some push 2%–5% in hail-prone counties — so on $230,000 of dwelling coverage a 2% deductible is $4,600 out of pocket per hail claim. Then the roof schedule: as a shingle roof ages, many Texas policies switch it from replacement cost to actual cash value (ACV), paying replacement cost minus depreciation. Per our DFW roof-replacement cost guide, a $14,000 hail roof claim on replacement-cost coverage pays about $9,400 after the deductible, while the same claim on a 15-year-old roof the carrier has moved to ACV might pay $2,400 and leave you covering $11,600. Get a landlord quote on the address before you offer, hold the deductible in reserve, and price a roof past ten years into the rehab, not the capex line.
3. Vacancy and turnover
A rental is not occupied twelve months a year. As of 2026, a well-priced DFW single-family house sits two to four weeks between tenants and a mispriced one two to three months, so I budget 5%–8% of gross rent as a vacancy allowance — $115–$184 a month on a $2,300 rental. Turnover comes with the vacancy: a make-ready between tenants (paint, cleaning, a flooring repair, re-key) runs $1,500–$4,000 on a typical DFW house, plus the leasing fee below, and the average tenancy I see is about two years — so model a turn every 24 months, not never.
4. Management — 8–10% plus a leasing fee, or your own Tuesday nights
Third-party management in DFW as of 2026 typically costs 8%–10% of collected rent, plus a leasing fee of half to a full month’s rent per placement. On a $2,300 rental, 8% is $184 a month and a one-month leasing fee spread over a two-year tenancy is another $96 — about $280 a month all-in.
Self-managing saves most of that line but none of the vacancy or turnover, and it is only real if you live within driving distance, can take a repair call on a weeknight, and know the Texas Property Code’s landlord obligations. If you are buying from outside Texas, budget management from day one — the out-of-state investing playbook covers building that bench remotely. Run the deal with management first; if it only works self-managed, you are buying a part-time job.
5. Maintenance and capital reserves
Maintenance is the small stuff — a disposal, a leaking faucet, a fence section — and I budget 5%–10% of rent, low end for a freshly renovated house, high end for a 1970s house with original plumbing. Capital expenditures are the big systems that fail on a schedule. In DFW an asphalt roof realistically lasts 12–18 years and costs $10,000–$17,000 to replace; an HVAC system lasts roughly 12–17 years in Texas heat (the AC and HVAC replacement cost guide has 2026 ranges); and the clay soil under most of the metro makes foundation movement a real line item — read the Texas foundation repair cost guide before buying anything on an unchecked slab. Spread those over their lives and a realistic capex reserve is $100–$250 a month per unit, lower when the roof and HVAC are recent.
If the house is in an HOA, the dues are an operating line like taxes — and read the CC&Rs before you offer, because some DFW associations cap or prohibit leasing, and all of them can fine and lien.
The offsetting upside — no state income tax. A Texas rental’s net income is taxed federally (and by your home state, if you live elsewhere) but not by Texas — with depreciation, a genuine advantage of holding here, and an after-tax question for a Texas CPA.
The three numbers that decide a rental
NOI and cap rate. Net operating income is gross rent minus every operating expense above, before the mortgage. Cap rate is NOI divided by your all-in price: the property’s unleveraged yield, and the right tool for comparing two houses. On a renovated DFW single-family house with all reserves funded, roughly 4%–5.5% on your basis is typical as of 2026.
Cash-on-cash return. Annual cash flow after the mortgage, divided by the cash you actually put in — down payment, closing costs, points, and rehab. This is the number that tells you whether the deal works at your leverage.
DSCR — calculated two ways. Lenders usually compute the debt-service-coverage ratio as gross monthly rent ÷ PITIA (principal, interest, taxes, insurance, HOA). You should also compute NOI ÷ annual debt service, which is stricter because it funds the operating lines before the loan gets paid. Lender norms as of 2026, consistent with the DSCR refinance section of our hard-money guide: most will close at 1.0, price the best terms at 1.20–1.25 or better, and the median closed loan runs near 1.16. A deal can pass the lender’s preferred 1.25 and fail your own 1.0; that gap is where first-year landlords get surprised.
A fully worked hypothetical: a Tarrant County rental
Everything below is illustrative — round numbers on a made-up deal, not a specific Diamond property and not a promise of what you will earn: a 1980s three-bedroom, two-bath brick house in an older Tarrant County suburb, roof and HVAC replaced in the last few years, no HOA, bought off-market through the marketplace.
| Acquisition | Figure |
|---|---|
| Post-rehab value (closed comps) | $285,000 |
| Investor’s purchase price (via Diamond) | $198,000 |
| Rent-ready rehab (cosmetic, water heater, make-ready) | $22,000 |
| Purchase closing costs | $3,500 |
| All-in basis | $223,500 |
| Rent (renovated comps in the submarket) | $2,300/month — $27,600/year |
The screen passes — 1.03% of basis, 0.81% of retail — and the price sits inside the 75–80%-of-ARV-minus-repairs band ($285,000 × 78% − $22,000 ≈ $200,000). Now the operating statement, with all five costs funded and the tax line on the post-rehab value:
| Operating expense | Monthly | Annual |
|---|---|---|
| Property tax (~2.2% nominal on the $285,000 post-rehab value) | $523 | $6,270 |
| Landlord insurance (2% wind/hail deductible = $4,600) | $250 | $3,000 |
| Property management (8% of rent) | $184 | $2,208 |
| Leasing fee (one month’s rent over a 24-month tenancy) | $96 | $1,152 |
| Vacancy allowance (6%) | $138 | $1,656 |
| Maintenance (5%) | $115 | $1,380 |
| Capital reserve (recent roof and HVAC) | $150 | $1,800 |
| HOA | $0 | $0 |
| Total operating expenses | $1,456 | $17,466 |
| Net operating income | $844 | $10,134 |
That is a 63.3% operating-expense ratio, which startles people who learned a 40% rule of thumb elsewhere; Texas taxes and management are why. The cap rate on the $223,500 basis is 4.5%, and 3.6% on retail value.
Now the financing. A DSCR purchase loan at 75% of the $198,000 price is $148,500, 30-year fixed. The hard-money guide’s July 2026 figures put DSCR money at roughly 6.125%–7.5% for strong files, but rates have moved since: Freddie Mac’s conforming 30-year jumped to 7.28% on October 1, and investor money prices meaningfully above that owner-occupied benchmark. For a first-time borrower I will use 7.75% with 1.5 points — $1,064 a month of principal and interest, $12,766 a year.
| Summary | Figure |
|---|---|
| Lender DSCR — rent ÷ PITIA: $2,300 ÷ ($1,064 + $523 + $250) | 1.25 — passes |
| Investor coverage — NOI ÷ debt service: $10,134 ÷ $12,766 | 0.79 — fails |
| Monthly cash flow after debt (NOI $844 − P&I $1,064) | −$220 |
| Cash invested (down $49,500 + closing $3,500 + points $2,228 + rehab $22,000) | ~$77,200 |
| Cash-on-cash, with management | about −3.4% |
| Cash-on-cash, self-managed (+$280/month) | about +0.9% |
Read that honestly. The lender says yes at 1.25 — right at the ratio most lenders price best. The investor’s math says this house, at 75% leverage and a high-7s rate with every reserve funded and a manager in place, loses about $220 a month; self-managed it roughly breaks even, about $60 a month on $77,000 of cash. What you are buying is roughly $61,500 of day-one equity, about $1,300 of year-one principal paydown, and depreciation on a federal return — real, but not income. If you need $200 a month in hand, this deal does not deliver it at 75% leverage: the loan would need to drop to roughly $90,000, about $108,000 down instead of $49,500. Knowing that before you offer is the entire point of running the numbers.
BRRRR mechanics at 2026 rates: the refinance lenders actually make
Buy-rehab-rent-refinance-repeat is the same deal with a different financing sequence: buy and renovate with hard money or cash, place a tenant, then refinance into a DSCR loan against the new appraised value and pull your capital back out. Here is how it works as of 2026 on the hypothetical above.
The LTV cap. DSCR lenders generally cap a cash-out refinance near 75% of appraised value, rising toward 80% for 740+ credit with strong coverage. On a $285,000 appraisal, 75% is $213,750 — on paper, about 96% of the $223,500 basis back.
Seasoning. Most lenders require three to six months of ownership (some twelve) before lending on appraised value instead of purchase price — months of hard-money carry the hard-money guide prices in detail.
DSCR sizing, the real constraint. Cash-out DSCR money prices higher than a purchase loan — into the high 7s and 8s as of 2026. At 7.875%, the payment on $213,750 is about $1,550 and PITIA about $2,323, so the lender DSCR is $2,300 ÷ $2,323 = 0.99 — it does not clear the 1.0 floor, let alone the 1.20–1.25 most lenders want. So the lender sizes the loan down: at 1.20 the maximum PITIA is about $1,917, the maximum P&I about $1,144, and the maximum loan about $158,000 — roughly 55% of value. You pull out $158,000 of your $223,500 basis, leave about $65,000 in, and the monthly cash flow with a manager is roughly −$300 because the cash-out rate is higher.
That is not an argument against BRRRR; it is an argument for modeling the refinance before you buy, at the rent, rate, and ratio the lender will actually use. In DFW at 2026 rates, plan to leave roughly 30% of your basis in a typical deal and treat anything better as upside.
The rental calculator tie-in: what to override
Every marketplace deal page carries a rental calculator pre-filled with the purchase price, our scoped rehab, and the area’s rent comps. It is a starting point, not an answer; the five costs above are the fields to override: property tax at the parcel’s nominal rate on the post-rehab value; insurance from an actual landlord quote; management at 8%–10% plus the leasing fee unless you will honestly self-manage; vacancy, maintenance, and capex adjusted for the age of the roof, HVAC, and foundation; and financing at your lender’s real rate, points, and LTV. If the deal still works after every override, submit the offer inside the portal; if it only works with the defaults, it does not work. For the offer, the single-closing assignment at a Texas title company, and the one-to-four-week close, read how buying from Diamond works.
A good first rental versus a trap
A good first Texas rental, as of 2026, tends to look like this: bought meaningfully below its post-rehab value, so there is equity on day one and the rent screens at or near 1% of basis; a three- or four-bedroom in an established, mostly owner-occupied neighborhood with real rent comps; roof and HVAC recent or priced into the rehab; a tax rate at the low end of its county’s range with no MUD, PID, or HOA; an insurance quote in hand; and a lender DSCR comfortably above 1.25 with your own coverage near 1.0. Thin cash flow is acceptable on a first deal. Negative cash flow you did not know about is not.
A trap tends to look like this: a near-retail purchase that only hits 1% because taxes and insurance were left off; a new-build in a MUD district with a combined rate pushing 3%; a roof nearing its carrier’s ACV switch (often 15 years, earlier on budget carriers) under a 2% hail deductible; a flood-zone address nobody checked; a rent number from a listing that never leased; and a pro forma that only works self-managed from 1,500 miles away.
For how these numbers move with the broader market, the Q4 2026 Texas investment-property brief covers what changed this fall, and the buy page lists the Texas markets we source in. When you are ready to run this analysis on live inventory, browse the current deals on the marketplace — the rental calculator, the vetted DSCR and conventional lenders, and the contractor list come with every property, and the account is free.
The bottom line
A Texas rental is decided by five costs most beginners never model — full-rate property taxes, hail-priced insurance, vacancy and turnover, management, and a capital reserve — and by three numbers that only mean something once those costs are honest: cap rate to compare properties, cash-on-cash to judge your leverage, and DSCR both the lender’s way and yours. Use the 1% rule to decide what to analyze, buy below market because that discount is where the DFW margin lives in 2026, and model the BRRRR refinance at the lender’s coverage ratio, not the LTV cap.
Diamond is the seller of the deal and the source of the calculators and the lender roster; the capital, the analysis, and the decision are yours.
Nothing here is investment, legal, tax, or lending advice, and we are not financial advisors. The figures above are hypothetical illustrations, not underwriting for any property and not a projection of returns; verify every rate, tax, insurance, and lender number against current quotes for the actual address. Diamond sells deals as a principal and does not originate loans.