Updated 2026 · Based on median market data for San Antonio, TX
The median monthly rent in San Antonio, TX is $1,390, translating to $16,680 in annual gross rental income per unit. The rent-to-price ratio is 0.51% — well below the 1% rule, making pure cash flow investing challenging at median prices and requiring investors to target below-median purchases or value-add strategies. For context, a 0.51% rent-to-price ratio means that for every $100,000 invested in property, you collect approximately $505/mo in gross rent. The gross rent multiplier of 16.5x means it takes 16.5 years of gross rent to equal the purchase price — a high ratio that reflects price appreciation outpacing rent growth.
Renters in San Antonio spend approximately 30% of the local median household income ($55,400) on rent. This exceeds the standard 30% affordability threshold, suggesting rent growth may face resistance — but it also means a large portion of the population finds buying even more out of reach, supporting deep rental demand. Landlords should be cautious about aggressive rent increases and focus instead on tenant retention to minimize costly turnover.
The vacancy rate in San Antonio is 6.8%. This is a healthy vacancy rate that indicates balanced supply and demand. You should be able to find quality tenants without extended vacancies, though expect normal turnover periods of 2-4 weeks between tenants. Budget for one month of vacancy per year in your underwriting to be conservative. Population growth of 1.4% annually is actively adding rental demand, creating a tailwind for landlords.
San Antonio's GRM (price divided by annual rent) is 16.5x. A GRM above 16x means the property is expensive relative to its income. Investors here are typically betting on appreciation rather than current cash flow, which adds risk if the appreciation thesis does not materialize. For comparison, the national average GRM for investment-grade rentals is approximately 13-15x. To beat San Antonio's median GRM, target properties where you can achieve rents above $1,390 through renovations, better marketing, or targeting underserved tenant segments — or buy at a discount to the $275,000 median price. Every point lower on GRM translates to roughly 0.5-0.8% improvement in your cap rate.
At the median rent of $1,390/mo, a single-family rental in San Antonio generates approximately $16,680 in gross annual income. After accounting for 6.8% vacancy ($1,134 lost), property taxes of $4,730, insurance (~$1,100), and maintenance (~$1,100), the estimated NOI is $8,616 per year, or $718/mo. Adding an 8% management fee ($1,334/yr) reduces investor cash flow further. Before debt service, you are looking at approximately $7,281/yr in landlord net income. Whether this is attractive depends on your total capital invested — at a $55,000 down payment, the unlevered yield on equity from NOI alone is 15.7%.
Rent growth in San Antonio is driven by the interplay of population growth (1.4%), income growth, and housing supply constraints. Moderate population growth of 1.4% supports steady rent increases of approximately 2.5% per year. That trajectory takes today's $1,390/mo to $1,497 in 3 years and $1,573 in 5 years. The affordability headroom of $-5/mo between current rents and the 30% income threshold is essentially zero, meaning rent increases must be matched by income growth to avoid tenant turnover.
The median income of $55,400 supports a mixed tenant base of young professionals, small families, and long-term renters. The larger population base of 1,547,253 gives you a deeper tenant pool to draw from, reducing re-leasing time.
San Antonio is a large enough market to support multiple professional property management companies, giving you negotiating leverage on fees. Expect to pay 8-10% of collected rent for full-service management, with leasing fees of 50-100% of one month's rent for new tenant placement. At $1,390/mo rent, that is $125/mo in management fees. Self-management makes sense if you are local, have fewer than 5 units, and the rent level justifies your time — at $1,390/mo, self-management of a small portfolio saves meaningful dollars but professional management becomes economical at 3-4 units.
San Antonio vs Texas state average and national average across key investment metrics. San Antonio's cap rate is below both benchmarks — deal sourcing is critical here.