A San Antonio address is not always a City of San Antonio one

What buying in San Antonio actually involves

The property tax is the largest cost of owning here after the mortgage, and it is worked out unit by unit. A house in the City of San Antonio and Northside ISD, the school district more of the city's residents live in than any other, pays seven: Bexar County, the county's Road and Flood Control Fund, University Health, the City, the school district, the Alamo Community College District and the San Antonio River Authority, and their 2025 rates add to 2.290174 per $100 of value. Each takes a homestead exemption off first, the school district a flat $140,000, the flood fund $3,000 and 20%, the county, University Health and the City 20% each, the River Authority 4% and the college 1%, which the Tax Code's floor makes $5,000, so on the $280,999 Bexar County median house an owner who lives in it pays about $4,390 a year and a landlord about $6,435. The exemptions are not automatic: you apply to the Bexar Appraisal District, and in the year you buy you get a prorated one only if the seller had none. A house in San Antonio ISD, North East ISD or another school district, in one of the separate cities, or in a special improvement district outside the limits pays a different bill.

The value the rates are charged on is reset every year, and an owner has until 15 May, or 30 days after the appraisal district mails the notice if that is later, to protest it. On a homestead the taxable value may rise no more than 10% a year once the owner has held the exemption, and the cap ends with the sale, so a buyer is taxed on the full value from the first bill and the seller's bill understates the buyer's. The school district's line is the largest on the bill: Northside ISD's 1.0049 per $100 is nearly twice the City's 0.54159, which was the same for 2024 and 2025. And some of what an owner pays the City does not arrive as tax at all: the City owns CPS Energy, which has paid $10.6 billion into the City's revenue since the City bought it in 1942, and the garbage fee, $25.26 a month for the medium cart, comes on the CPS Energy bill, with the City's stormwater fee on the water bill from SAWS.

Where the city ends matters more here than in most places. San Antonio grew by annexation to 499 square miles of land, and in 2017 Senate Bill 6 stopped that: in a county the size of Bexar, a Texas city may now annex only with the owner's consent or the voters' approval. So the newer subdivisions beyond the limits, in the City's extraterritorial jurisdiction, mostly stay outside it, and many were built with a special improvement district the county created with the City's consent, 22 of which levy 0.54159 per $100, the same as the City's own rate, for the roads and pipes. Inside the limits the school district is its own map: on the Census Bureau's 2020 blocks, 468,901 of the city's 1,434,625 people lived in Northside ISD, 368,830 in North East ISD and 298,175 in San Antonio ISD. The City's own down payment loans, HIP 80 and HIP 120, are only for a house inside the limits.

Water is the other map to read. San Antonio sits along the Balcones Escarpment, where storms can stall: in October 1998 rain fell on the communities along it almost without a break for up to 36 hours. The flood of September 1921 killed at least fifty-one people downtown and led to the Olmos Dam, finished in 1926; on 17 October 1998, 11.26 inches of rain fell at the airport, the most on any day on record; and in the early hours of 12 June 2025, 3.98 inches fell there in one hour, the highest hourly total since records began in 1934, and 13 people died, 11 of them after 15 vehicles were swept into Beitel Creek from a Loop 410 frontage road. A homeowners policy does not cover rising water, so a flood policy is a separate premium, and it is worth pricing on the exact address, and asking the seller about past flooding, even where a lender does not require one.

Moving to San Antonio: check these before you commit

• The appraisal district's value for the house, the protest deadline on this year's notice, and what the 10% homestead cap has done to the seller's bill, since the cap ends on the sale
• Which city, school district and special district tax the address, from the Bexar Appraisal District's record rather than the mailing address
• Whether the house is inside the City of San Antonio at all, which the City's own down payment loans require, rather than in one of the separate cities it surrounds or in its extraterritorial jurisdiction
• FEMA's flood map for the exact address, the creeks and low crossings on the routes you will drive, the seller's disclosure of past flooding, and a quote for a separate flood policy
• The roof's age, and whether the homeowners policy pays replacement cost or depreciated value on it and what its wind and hail deductible is