You are underwriting a rental and the numbers look perfect, except for one line most first-time investors skip: the month nobody pays rent. Vacancy rate is the vital sign of a rental market, and the investors who ignore it are the ones who get surprised by an empty unit right when the mortgage payment is due. Let's make sure you are not one of them, Patriot Nation.
PATRICK'S QUICK ANSWER
Vacancy rate is the share of units sitting empty, and it tells you how healthy a rental market is. I look for single-digit vacancy and always budget an allowance for the empty month, even in tight markets, because vacancy always happens eventually.
Vacancy is the rental market's vital sign: a low rate means demand is strong and units lease quickly, while a rising rate means oversupply, weak demand, or pricing above the market. In San Antonio, single-digit vacancy, roughly 5 to 7 percent in stable neighborhoods, is a healthy reading, with some pockets tighter and some urban pockets looser. Ask Patrick how vacancy rates on rentals would work for your investment goals.
The investor mistake is treating a tight market as permanent. Even in a low-vacancy neighborhood, a lease ends, a unit needs turnover time, and the calendar can leave you empty in a slow month, so every cash-flow model needs a vacancy allowance, commonly around 5 to 8 percent, plus the cash to cover it. The empty month is the rule, not the exception.
Managing vacancy is about pricing and speed: price at or just below the market's sweet spot, respond to maintenance fast enough to renew good tenants, and market the unit the day it opens rather than after it empties. A unit that sits 30 extra days often costs more than a modest rent reduction would have.
What a good vacancy rate actually is
The term "vacancy rate" is the percentage of units sitting empty, and it is the first number I read on any rental market. Below 5 percent is excellent: demand is outpacing supply and units lease fast. Five to 7 percent is healthy and normal, a market that turns over without panic. Above 7 percent, start asking whether the pricing is too high, the marketing is weak, or the area is overbuilt.
The money consequence is simple: every point of vacancy is rent you never collect. A unit empty two extra months a year is losing roughly two months of income on a property that still has a mortgage, taxes, and insurance to pay. That is why the vacancy line belongs in the underwriting, not in the hope column.
Read the submarket, not the city
Citywide vacancy numbers hide the truth that matters to your specific property. Vacancy varies by zip code, property type, and season, so compare your unit against its own submarket. Near a university, demand follows the academic calendar. In a new suburb, it tracks how many homes are being built around you. Downtown, it follows jobs and renters moving in.
The real-world consequence: a 6 percent city average means nothing if your zip runs 9 percent and your building is the oldest on the block. Know the vacancy story of the block you are buying, not the city you are in, and you will underwrite with your eyes open.
The empty month is the rule, not the exception
Every cash-flow model needs a vacancy allowance, commonly around 5 to 8 percent, even in a neighborhood that has not had a vacancy in years. A lease ends, the unit needs a turnover, or the calendar lands you in the slowest month of the year, and there you are with the mortgage still due.
The money consequence is the difference between a deal that survives and a deal that bleeds. Manage the risk on the front end: price at or just below the market's sweet spot, respond to maintenance fast enough to renew good tenants, and market the unit the day it opens instead of the day it empties. A unit that sits 30 extra days usually costs more than a modest rent reduction would have.
The reserve is the safety net
Hold a vacancy reserve, a cash buffer built for the months the rent stops, and underwrite every deal with the allowance already in the model. The deals that hurt investors are rarely the ones that lost a tenant; they are the ones that never planned for it.
Make it a great one, Patriot Nation. Buy the income with the empty month priced in, and the vacancy rate stops being a scary line and becomes just another number you planned for.
Ask Patrick about vacancy rates on rentals
Get a straight answer on vacancy rates on rentals and how it fits your rental or investment plan.
