ZIP CODE 78664 // AUSTIN-ROUND ROCK-GEORGETOWN, TX // DATA AS OF 2026-09-30
Round Rock, TX (78664) Rental Property Cap Rate & Cash Flow Report
Located in Williamson County (Round Rock, TX), Zip Code 78664 ranks #233 of 500 within this selected sample (54th percentile) with a Zillow ZHVI typical home-value index of $327,633 (-5.6% YoY) and a ZORI observed market rent of $1,643/mo (+3.2% YoY). Requires at least 56.9% down payment at 6.5% interest to reach $0/mo break-even cash flow. This model combines different housing populations; it is not an observed average property return. Costs assume state-average tax, 0.5% annual insurance, 13% reserves and no HOA or management. Figures below follow your edits; this headline describes the original benchmark.
Net Monthly Cash Flow
-$765/mo
Annual: -$9,181/yr
Modeled Cap Rate
3.27%
NOI: $10,699/yr
Cash-on-Cash Return
-12.18%
Cash Needed: $75,356
1% Rule Ratio
0.50%
Gross Yield: 6.02%
Break-Even Rent
$2,522/mo
State Tax: 1.47%/yr
INTERACTIVE PRO-FORMA STATEMENT (ZIP 78664 BENCHMARK)
Edit any value
Purchase Price (ZHVI proxy)
Monthly Gross Rent (ZORI proxy)
Down Payment (%)
Interest Rate (30Y Fixed %)
Annual Property Tax (TX Avg 1.47%)
Annual Home Insurance ($)
Monthly HOA Fee ($)
Monthly Debt Service (P&I)
-$1,657/mo
Monthly Operating Expenses (Tax + Ins + 13% Reserves)
-$751/mo
HISTORICAL ZHVI PRICE VS. ZORI RENT TRAJECTORY (78664)
| Year | ZHVI Value | ZORI Rent | Gross Yield |
|---|---|---|---|
| 2021 | $391,198 | $1,550/mo | 4.75% |
| 2022 | $444,627 | $1,713/mo | 4.62% |
| 2023 | $385,962 | $1,686/mo | 5.24% |
| 2024 | $372,352 | $1,635/mo | 5.27% |
| 2025 | $347,060 | $1,592/mo | 5.50% |
| 2026 | $327,633 | $1,643/mo | 6.02% |
COMPARABLE U.S. RENTAL MARKETS
| Zip / City | Price | Rent | Cap Rate | Cash Flow |
|---|---|---|---|---|
| 76028 Burleson, TX | $335,960 | $1,694/mo | 3.29% | -$777/mo |
| 77429 Cypress, TX | $373,727 | $1,862/mo | 3.23% | -$883/mo |
| 78253 San Antonio, TX | $319,964 | $1,592/mo | 3.22% | -$758/mo |
| 77584 Pearland, TX | $382,920 | $1,905/mo | 3.22% | -$908/mo |
| 77082 Houston, TX | $248,562 | $1,265/mo | 3.34% | -$564/mo |
| 79912 El Paso, TX | $320,367 | $1,554/mo | 3.09% | -$794/mo |