A ZIP code or a seller's old tax bill cannot tell you exactly what you will owe. Start with the property's appraisal record, taxing units, and your own eligibility for exemptions.
Start with the specific address
Texas has no state property tax. Local taxing units, which may include a school district, county, city, and special districts, set their own rates. The combined rate and taxable value depend on the property, so a broad Austin percentage is a poor substitute for an address-level estimate.
Find the parcel in the county appraisal district's records and identify each taxing unit. Check the current value and exemption history, then use the applicable units' published rates to build an estimate. A prior owner's bill may reflect exemptions you will not qualify for.
Separate appraised value from the purchase price
The appraisal district determines the taxable value under Texas rules; the contract price is not itself the tax bill. Appraisals are tied to the tax year's assessment process, and future values and rates can change. Budget for that uncertainty rather than projecting a single year's bill indefinitely.
For a waterfront home, large lot, condo, or property crossing jurisdictional boundaries, confirm the actual parcel and taxing units instead of relying on a neighborhood label or ZIP code.
Check exemptions against your circumstances
Texas offers a residence homestead exemption and other exemptions for qualifying owners, but eligibility is determined under state rules and administered by the local appraisal district. If you are moving from another state, ask the district what documentation and timing apply to your purchase and intended use of the home.
Include insurance, any HOA dues, maintenance, and potential special assessments in the broader ownership budget. A lender, tax adviser, or attorney can help with personal financial or legal questions; a real estate guide cannot determine your tax liability.