The definition, in one sentence
Net effective rent is what you actually pay per month once a free-rent concession is spread across the whole lease term. Listed rent is the sticker. Net effective rent is the truth, at least for year one.
The arithmetic is simple and the consequence is not obvious, which is why this catches so many renters. Understanding it is the difference between picking the cheaper apartment and picking the one that looked cheaper. It is also the reason our homepage publishes the comparison rather than saving it for a sales call.
The worked example
Two real-shaped San Antonio options, both two-bedrooms, both twelve-month leases.
| Unit A | Unit B | |
|---|---|---|
| Advertised rent | $1,500 | $1,400 |
| Concession | 2 months free | None |
| Months actually paid | 10 | 12 |
| Total across the term | $15,000 | $16,800 |
| Net effective rent | $1,250 | $1,400 |
Unit A has the higher sticker price and costs $1,800 less over the year. If you had sorted a listing site by price ascending, you would never have seen it.
The formula, if you want to run your own:
Net effective rent = (listed rent × term months − listed rent × months free) ÷ term months
The catch nobody puts in the ad
Concessions are year-one only. At renewal, you negotiate from the listed rent, $1,500 in the example above, not $1,250.
That is why renewal offers so often feel like a brutal increase. A renter who thinks of their rent as $1,250 gets a renewal at $1,530 and reads it as a 22% hike. It is really the concession expiring plus a modest increase. Budgeting for the listed rent from day one avoids that entirely.
Ask how the concession is applied
Some properties waive whole months, so months one and two cost nothing and every other month is full price. Others spread the discount evenly and you pay the net effective figure monthly. The total is the same; the cash-flow shape is very different, and it matters if your move-in budget is tight.
Why this matters more right now
San Antonio is in a genuine renter’s market. Vacancy is near 10%, about half of communities are running one-to-three-months-free concessions, and Class A rents are down roughly 3.2% year over year. When that many properties are running specials of different depths, sticker-price comparison becomes actively misleading rather than just imprecise.
Concession depth also moves seasonally. Deepest December through February, thinnest May through August. That timing question is covered in best time of year to lease, and what is currently on offer sits in current San Antonio move-in specials.
Do not stop at net effective rent
One more step, and it is the one that changes answers again. Net effective rent covers the concession. It does not cover the mandatory fee stack, valet trash, pest, RUBS water and sewer, billing admin, tech and amenity packages, which adds 7-15% over base rent and does not get discounted by a concession.
The genuinely comparable number is:
Net effective rent + mandatory monthly fee stack
Run both properties through that and you have an apples-to-apples figure. The fee side is broken down on what San Antonio apartments actually cost per month.
The short version
Compare on net effective rent plus fees, never on advertised rent. Budget for the listed rent at renewal, not the discounted average. And if you would rather have someone assemble that comparison across six properties with a confirmation date on every concession, that is free, start here.
