What they are
New communities need water lines, sewers, roads, drainage. Developers front that infrastructure and recover it through special districts: a MUD (Municipal Utility District) taxes property within it to repay utility bonds; a PID (Public Improvement District) levies assessments for improvements, sometimes as a fixed annual amount or a payoff-able balance. Both are legal, disclosed, and common in the corridor's newest phases — and both sit on top of your county, city, and school taxes.
What they do to the payment
An additional assessment on a corridor-typical home can add a meaningful monthly sum for years — run your scenario in the MUD/PID impact calculator. This is exactly why a sales-office payment estimate quoted at a generic tax rate can undershoot reality: the buydown savings on the front of the flyer can be quietly consumed by the assessment that isn't on it.
How to verify, every time
Ask the builder in writing for the total tax rate including all MUD/PID assessments; cross-check the county appraisal district's record for the specific lot; and for PIDs, ask whether the assessment is payoff-able, what the balance is, and whether the seller is paying any portion. Texas requires MUD/PID notice in contracts — read that page like it's the price, because it is. Educational only, August 2026; rates vary lot by lot — verify with the county and district.
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