Rental numbers for ZIP 78598 (Port Mansfield, TX)
Negative cash flow at any interest rate with 25% down: the rent does not cover operating costs and principal.
- Gross yield
- 4.3%
- rent x 12 / price
- Est. cap rate
- -0.2%
- NOI / price
- Cash flow
- -$1,506/mo
- at 7.78%, 25% down
- Typical price
- $271,000
- Zillow ZHVI, Aug 2026
- HUD Fair Market Rent
- $970/mo
- HUD Fair Market Rent, 2 bedroom, FY2026
The pro forma
Typical home, default assumptions
| Operator | Line | Amount | Source |
|---|---|---|---|
| Gross rent | $11,640 | ||
| Vacancy | $582 | ||
| Management | $885 | ||
| Property tax | $4,568 | ||
| Insurance | $3,437 | ||
| Maintenance | $2,711 | ||
| Net operating income | -$542 | ||
| Loan payments | $17,530 | ||
| Cash flow | -$18,072 |
| Operator | Line | Amount | Source |
|---|---|---|---|
| Typical price | $271,090 | ||
| Down payment (25%) | $67,773 | ||
| Loan | $203,318 | ||
| Rate | 7.78% | ||
| Monthly payment | $1,461 | ||
| Cash in | $75,905 | ||
| Cash-on-cash return | -23.8% | ||
| DSCR | -0.03 | ||
| Break-even rate | none |
Assumptions
Change them in the calculator- Down payment25%
- A common minimum for investment-property and DSCR loans.
- Interest rate7.78%
- Freddie Mac 30-year 7.03% (week of 2026-09-24) + 0.75 point investor premium.
- Loan term30 years
- Fixed, fully amortising.
- Closing costs3% of price
- Added to cash invested.
- Insurance$3,437 a year
- NAIC 2023 average homeowners (HO-3) premium for Texas, $2,864, x 1.2 for a landlord policy.
- Maintenance1% of price a year
- The 1% rule of thumb; older homes run higher.
- Vacancy5% of rent
- About 18 days empty a year.
- Management8% of collected rent
- A typical full-service fee; zero if you self-manage.
Trends
Five years to August 2026
- Price, 12 months
- +4.9%
- Rent, 12 months
- n/a
- no Zillow rent series here
- Rent minus price growth
- n/a
- positive means yields are improving
Show the numbers
| Month | Typical value |
|---|---|
| Aug 2021 | $320,341 |
| Aug 2022 | $322,393 |
| Aug 2023 | $283,467 |
| Aug 2024 | $285,705 |
| Aug 2025 | $258,427 |
| Aug 2026 | $271,090 |
Rent references
Two sources, never blended
| Source | Studio | 1 bed | 2 bed | 3 bed | 4 bed |
|---|---|---|---|---|---|
| HUD Small Area FMR, FY2026 | $740 | $740 | $970 | $1,350 | $1,430 |
| Zillow observed rent, Aug 2026 | not published for this ZIP | ||||
HUD's Fair Market Rent is the 40th percentile gross rent (rent plus utilities) for a standard unit, and it is what Section 8 vouchers pay against. Zillow's index tracks asking rents on listed homes. The two measure different things, so they are shown side by side and never averaged. HUD area: Willacy County, TX.
Property tax
- Effective rate
- 1.69%
- county, ACS
- At the typical price
- $4,568/yr
Median real estate taxes paid divided by median home value, Census ACS 2020 to 2024. Willacy County: 1.69%. Actual bills depend on the assessment, exemptions and any non-homestead rate.
Supply
- Permits per 1,000 households
- 6.8
- Willacy County, last 12 months
- National percentile
- 58th
- among US counties
39 new housing units permitted in 2025-09 to 2026-08, Census Building Permits Survey. A high figure means more new supply competing for tenants.
Nearby ZIP codes
| ZIP | Distance | Typical price | Rent | Gross yield | Cash flow /mo |
|---|---|---|---|---|---|
| 78583Rio Hondo | 19.9 mi | $216,000 | $1,050* | 5.8% | -$895 |
| 78597South Padre Island | 20.4 mi | $440,000 | $2,683 | 7.3% | -$1,093 |
| 78580Raymondville | 23.9 mi | $120,000 | $1,000* | 10.0% | -$330 |
| 78569Lyford | 26.5 mi | $172,000 | $1,000* | 7.0% | -$640 |
| 78550Harlingen | 27.8 mi | $182,000 | $1,073 | 7.1% | -$694 |
| 78566Los Fresnos | 29.1 mi | $228,000 | $1,000* | 5.3% | -$1,116 |
| 78594Santa Rosa | 30.8 mi | $106,000 | $970* | 11.0% | -$242 |
| 78593Santa Rosa | 34.3 mi | $158,000 | $990* | 7.5% | -$587 |
* HUD Fair Market Rent, 2 bedroom (no Zillow rent index for that ZIP).
Run the numbers on a real listing
The calculator opens with this ZIP's figures. Swap in a listing's price and rent, your rate and your costs.
Open the calculator for 78598Questions
- Is 78598 good for rental property?
- On the typical home here, priced at $271,000 and renting for $970 a month (HUD Fair Market Rent, 2 bedroom, FY2026), the gross yield is 4.3% and the estimated cap rate is -0.2%. At a 7.78% investor rate with 25% down, estimated cash flow is -$1,506 a month. The median gross yield across the 8,418 ZIP codes with full Zillow data is 5.6%. These are figures for a typical property, not a judgement on any particular one.
- What is the typical rent in 78598?
- Zillow does not publish a rent index for 78598. HUD's FY2026 Small Area Fair Market Rent for a 2-bedroom here is $970, the 40th percentile of gross rents and the basis for Section 8 payment standards.
- What is the property tax rate in 78598?
- The effective property tax rate is about 1.69% of value (median taxes paid divided by median home value, Census ACS 2020 to 2024, county figure because the ZIP-level one is not published). On the typical $271,000 home that is about $4,568 a year. Your bill depends on the assessment and local exemptions.
- What interest rate makes a rental in 78598 break even?
- With the default assumptions, no interest rate brings cash flow to zero: rent does not cover operating costs plus principal on a 30-year loan with 25% down.
- How fast are prices and rents changing in 78598?
- Over the 12 months to August 2026, the typical home value changed +4.9%.
Sources and method
- Zillow Home Value Index (ZHVI), mid tier, smoothed and seasonally adjusted
Zillow Research. Read: 2026-08.
Typical home value by ZIP, county, metro and state, and the price trend.
- HUD Small Area Fair Market Rents, FY2026
US Department of Housing and Urban Development. Read: FY2026.
Rent by bedroom count for every ZIP. The rent used on tier B pages, and a reference on all pages. It is the 40th percentile gross rent, so it runs below market.
- American Community Survey 5-year estimates, 2020 to 2024 (B25103 median real estate taxes paid, B25077 median home value, B11001 households)
US Census Bureau. Read: 2020 to 2024.
Effective property tax rate (median taxes paid divided by median value) by ZIP code tabulation area, county and state; households for the permits ratio.
- Freddie Mac Primary Mortgage Market Survey, 30-year fixed (FRED series MORTGAGE30US)
Freddie Mac via the Federal Reserve Bank of St. Louis. Read: 2026-09-24.
The weekly 30-year rate. The site adds a disclosed investor premium to it for the loan payment.
- Building Permits Survey, county monthly files
US Census Bureau. Read: 2025-09 to 2026-08.
New housing units permitted in the last 12 months per 1,000 households, a supply-pressure signal.
- NAIC Homeowners Insurance Report, data for 2023
National Association of Insurance Commissioners. Read: 2023.
Average HO-3 homeowners premium by state, multiplied by 1.2 as a landlord-policy assumption.
Data: Zillow Research (ZHVI, ZORI), HUD, US Census Bureau, Freddie Mac. Every formula is on the methodology page.
Estimates from public data for a typical property. Not investment, tax or legal advice. Your property, financing and costs will differ.