Rental numbers for ZIP 08830 (Iselin, NJ)
Negative cash flow at any interest rate with 25% down: the rent does not cover operating costs and principal.
- Gross yield
- 5.5%
- rent x 12 / price
- Est. cap rate
- 1.3%
- NOI / price
- Cash flow
- -$2,410/mo
- at 7.78%, 25% down
- Typical price
- $563,000
- Zillow ZHVI, Aug 2026
- Typical rent
- $2,574/mo
- Zillow ZORI, Aug 2026
The pro forma
Typical home, default assumptions
| Operator | Line | Amount | Source |
|---|---|---|---|
| Gross rent | $30,888 | ||
| Vacancy | $1,544 | ||
| Management | $2,347 | ||
| Property tax | $12,029 | ||
| Insurance | $1,861 | ||
| Maintenance | $5,629 | ||
| Net operating income | $7,477 | ||
| Loan payments | $36,399 | ||
| Cash flow | -$28,921 |
| Operator | Line | Amount | Source |
|---|---|---|---|
| Typical price | $562,890 | ||
| Down payment (25%) | $140,723 | ||
| Loan | $422,168 | ||
| Rate | 7.78% | ||
| Monthly payment | $3,033 | ||
| Cash in | $157,609 | ||
| Cash-on-cash return | -18.4% | ||
| DSCR | 0.21 | ||
| 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$1,861 a year
- NAIC 2023 average homeowners (HO-3) premium for New Jersey, $1,551, 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
- +3.8%
- Rent, 12 months
- +2.2%
- Rent minus price growth
- -1.5 pts
- positive means yields are improving
Show the numbers
| Month | Typical value | Rent |
|---|---|---|
| Aug 2021 | $395,160 | n/a |
| Aug 2022 | $426,269 | n/a |
| Aug 2023 | $462,187 | n/a |
| Aug 2024 | $512,015 | $2,399 |
| Aug 2025 | $542,550 | $2,518 |
| Aug 2026 | $562,890 | $2,574 |
Rent references
Two sources, never blended
| Source | Studio | 1 bed | 2 bed | 3 bed | 4 bed |
|---|---|---|---|---|---|
| HUD Small Area FMR, FY2026 | $2,010 | $2,200 | $2,770 | $3,320 | $3,670 |
| Zillow observed rent, Aug 2026 | $2,574 typical, all home types | ||||
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: Middlesex-Somerset-Hunterdon, NJ HUD Metro FMR Area.
Property tax
- Effective rate
- 2.14%
- ZIP area, ACS
- At the typical price
- $12,029/yr
Median real estate taxes paid divided by median home value, Census ACS 2020 to 2024. Middlesex County: 2.10%. Actual bills depend on the assessment, exemptions and any non-homestead rate.
Supply
- Permits per 1,000 households
- 4.7
- Middlesex County, last 12 months
- National percentile
- 47th
- among US counties
1,454 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 |
|---|---|---|---|---|---|
| 07067Colonia | 1.3 mi | $647,000 | $2,472 | 4.6% | -$3,111 |
| 07095Woodbridge | 1.9 mi | $485,000 | $2,519 | 6.2% | -$1,965 |
| 08863Fords | 2.3 mi | $541,000 | $2,395 | 5.3% | -$2,457 |
| 08820Edison | 2.6 mi | $828,000 | $3,136 | 4.5% | -$3,661 |
| 07001Avenel | 2.6 mi | $529,000 | $2,540* | 5.8% | -$2,219 |
| 08840Metuchen | 2.9 mi | $687,000 | $2,691 | 4.7% | -$3,100 |
| 07065Rahway | 3.2 mi | $541,000 | $2,482 | 5.5% | -$2,506 |
| 07066Clark | 3.5 mi | $726,000 | $2,350 | 3.9% | -$3,614 |
* 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 08830Questions
- Is 08830 good for rental property?
- On the typical home here, priced at $563,000 and renting for $2,574 a month (Zillow ZORI, Aug 2026), the gross yield is 5.5% and the estimated cap rate is 1.3%. At a 7.78% investor rate with 25% down, estimated cash flow is -$2,410 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 08830?
- Zillow's observed rent index for 08830 was $2,574 a month in August 2026, across all home types. HUD's FY2026 Small Area Fair Market Rent for a 2-bedroom here is $2,770, the 40th percentile of gross rents and the basis for Section 8 payment standards.
- What is the property tax rate in 08830?
- The effective property tax rate is about 2.14% of value (median taxes paid divided by median home value, Census ACS 2020 to 2024). On the typical $563,000 home that is about $12,029 a year. Your bill depends on the assessment and local exemptions.
- What interest rate makes a rental in 08830 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 08830?
- Over the 12 months to August 2026, the typical home value changed +3.8% and the typical rent changed +2.2%. Prices rising faster than rents pushes yields down.
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.
- Zillow Observed Rent Index (ZORI), all homes plus multifamily, smoothed
Zillow Research. Read: 2026-08.
Typical market rent by ZIP, county and metro, and the rent trend (tier A pages).
- 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.