Rental numbers for ZIP 63021 (Ballwin, MO)
Negative cash flow at any interest rate with 25% down: the rent does not cover operating costs and principal.
- Gross yield
- 4.9%
- rent x 12 / price
- Est. cap rate
- 1.6%
- NOI / price
- Cash flow
- -$1,576/mo
- at 7.78%, 25% down
- Typical price
- $390,000
- Zillow ZHVI, Aug 2026
- Typical rent
- $1,593/mo
- Zillow ZORI, Aug 2026
The pro forma
Typical home, default assumptions
| Operator | Line | Amount | Source |
|---|---|---|---|
| Gross rent | $19,116 | ||
| Vacancy | $956 | ||
| Management | $1,453 | ||
| Property tax | $4,608 | ||
| Insurance | $1,907 | ||
| Maintenance | $3,898 | ||
| Net operating income | $6,294 | ||
| Loan payments | $25,208 | ||
| Cash flow | -$18,914 |
| Operator | Line | Amount | Source |
|---|---|---|---|
| Typical price | $389,835 | ||
| Down payment (25%) | $97,459 | ||
| Loan | $292,376 | ||
| Rate | 7.78% | ||
| Monthly payment | $2,101 | ||
| Cash in | $109,154 | ||
| Cash-on-cash return | -17.3% | ||
| DSCR | 0.25 | ||
| 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$1,907 a year
- NAIC 2023 average homeowners (HO-3) premium for Missouri, $1,589, 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
- +2.1%
- Rent, 12 months
- +4.4%
- Rent minus price growth
- +2.3 pts
- positive means yields are improving
Show the numbers
| Month | Typical value | Rent |
|---|---|---|
| Aug 2021 | $316,211 | n/a |
| Aug 2022 | $347,474 | $1,383 |
| Aug 2023 | $361,026 | $1,438 |
| Aug 2024 | $370,792 | $1,502 |
| Aug 2025 | $381,795 | $1,526 |
| Aug 2026 | $389,835 | $1,593 |
Rent references
Two sources, never blended
| Source | Studio | 1 bed | 2 bed | 3 bed | 4 bed |
|---|---|---|---|---|---|
| HUD Small Area FMR, FY2026 | $1,130 | $1,180 | $1,440 | $1,850 | $2,140 |
| Zillow observed rent, Aug 2026 | $1,593 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: St. Louis, MO-IL HUD Metro FMR Area.
Property tax
- Effective rate
- 1.18%
- ZIP area, ACS
- At the typical price
- $4,608/yr
Median real estate taxes paid divided by median home value, Census ACS 2020 to 2024. St. Louis County: 1.21%. Actual bills depend on the assessment, exemptions and any non-homestead rate.
Supply
- Permits per 1,000 households
- 2.4
- St. Louis County, last 12 months
- National percentile
- 29th
- among US counties
994 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 |
|---|---|---|---|---|---|
| 63011Ballwin | 2.5 mi | $441,000 | $1,947 | 5.3% | -$1,616 |
| 63088Valley Park | 2.8 mi | $291,000 | $1,420* | 5.9% | -$1,069 |
| 63040Wildwood | 4.8 mi | $479,000 | $1,620* | 4.1% | -$2,197 |
| 63017Chesterfield | 6.0 mi | $559,000 | $1,749 | 3.8% | -$2,631 |
| 63049High Ridge | 6.4 mi | $281,000 | $1,080* | 4.6% | -$1,174 |
| 63131Des Peres | 6.6 mi | $1,002,000 | $1,830* | 2.2% | -$5,656 |
| 63026Fenton | 6.6 mi | $354,000 | $1,546 | 5.2% | -$1,342 |
| 63038Wildwood | 6.6 mi | $662,000 | $1,500* | 2.7% | -$3,586 |
* 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 63021Questions
- Is 63021 good for rental property?
- On the typical home here, priced at $390,000 and renting for $1,593 a month (Zillow ZORI, Aug 2026), the gross yield is 4.9% and the estimated cap rate is 1.6%. At a 7.78% investor rate with 25% down, estimated cash flow is -$1,576 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 63021?
- Zillow's observed rent index for 63021 was $1,593 a month in August 2026, across all home types. HUD's FY2026 Small Area Fair Market Rent for a 2-bedroom here is $1,440, the 40th percentile of gross rents and the basis for Section 8 payment standards.
- What is the property tax rate in 63021?
- The effective property tax rate is about 1.18% of value (median taxes paid divided by median home value, Census ACS 2020 to 2024). On the typical $390,000 home that is about $4,608 a year. Your bill depends on the assessment and local exemptions.
- What interest rate makes a rental in 63021 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 63021?
- Over the 12 months to August 2026, the typical home value changed +2.1% and the typical rent changed +4.4%. Rents rising faster than prices pushes yields up.
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.