MUD and PID Taxes in Round Rock, Hutto & Georgetown: What Buyers Should Know

If you're house hunting in Round Rock, Hutto, Georgetown or anywhere else in Williamson County, you'll see "MUD" or "PID" on a lot of listings, especially new construction. Both add to your yearly tax bill, and on the same price home they can change your monthly payment by a few hundred dollars. Here's how I walk my buyers through them before they write an offer.

What is a MUD?

A Municipal Utility District (MUD) is a special taxing district, usually set up by a developer, that sells bonds to build the water, sewer and drainage lines for a new neighborhood. Homeowners inside the district repay those bonds through a MUD tax that shows up on the regular property tax bill, right next to the school district, county and city.

MUDs are everywhere in our area. Community Impact reported that Williamson County has more than 80 active MUDs, with over 20 created since 2020. Round Rock MUD #1 and #2, Stonewall Ranch MUD, Rancho Del Cielo MUD and SE Williamson Co MUD #1 are a few that show up on local tax rolls.

What is a PID?

A Public Improvement District (PID) is created by a city or county to pay for improvements like roads, sidewalks, landscaping, parks or amenity centers. Instead of a tax rate, a PID charges each lot an assessment, a fixed amount that is usually paid in yearly installments over many years. Georgetown Village PID #1 is one long-standing local example.

One thing I like about PIDs: you can often pay the remaining assessment off early and save the interest. Ask the city or the PID administrator for a payoff figure.

How much do they add?

Before any MUD or PID, a typical Round Rock address (Round Rock ISD, City of Round Rock, Williamson County and ACC) runs roughly $1.75 per $100 of taxable value, based on the 2025 adopted rates. Newer MUDs in our area commonly add another $0.80 to $1.00 per $100, and some neighborhoods also pay an emergency services district (ESD) rate of up to $0.10.

Example: $400,000 taxable value	Per year	Per month
No MUD, about $1.75 per $100	$7,000	$583
Add a $0.85 MUD rate	+$3,400	+$283
Total with MUD	$10,400	$867

Illustration only, before homestead exemptions. Your actual rates depend on the exact address.

That $283 a month is real buying power. On a mortgage at today's rates it can be the difference between qualifying for a $400,000 home and a $350,000 home, so I always run the full tax picture before we pick a price range.

Do MUD taxes ever go down?

Usually, yes, but slowly. As the neighborhood fills in and home values rise, the MUD can spread its debt over more taxable value and lower its rate. Williamson County's tax assessor has said it often takes 20 to 30 years for a MUD rate to drop below a typical city rate. Some older MUDs in our area are already well under $0.40. Some areas also get annexed by the city, and the city takes over the MUD's debt.

The flip side: a newer MUD that hasn't sold all its bonds yet can still issue more debt. The MUD notice tells you how much the district is authorized to borrow, so read that line.

What Texas law requires the seller to tell you

• MUD notice (Texas Water Code 49.452): the seller must give you a written "Notice to Purchaser of Special Taxing or Assessment District" before you sign the contract. It shows the current tax rate and the district's bond authority. If you don't get it, you can terminate the contract. If it shows up late and you close anyway, you give up that right. A signed copy is recorded at closing.
• PID notice (Texas Property Code 5.014): also due before you sign the contract, signed at closing, notarized and recorded. If you don't get it in time, you can terminate. Heads up: the required form doesn't list the assessment amount, so we have to ask the city or the PID for the actual dollar figure.

My checklist before you make an offer

1. Look up the property on the Williamson Central Appraisal District site and list every taxing unit on it.
2. Get the MUD's current rate and the PID's yearly installment, plus how many years are left.
3. Ask your lender to qualify you using the full tax rate, not an estimate from the listing.
4. Compare the total monthly payment, not just the price. A cheaper home in a high-MUD neighborhood can cost more each month than a pricier home without one.
5. File your homestead exemption after you move in. It lowers your taxable value for most taxing units.

Frequently asked questions

Are MUD taxes deductible? MUD taxes are property taxes, so they generally count toward the federal state and local tax deduction if you itemize. Ask your tax professional about your situation.

Is a MUD neighborhood a bad buy? Not at all. MUDs are why so many newer neighborhoods exist, and they often come with parks and trails. You just need to price the payment in from day one.

Do new builders include the MUD rate in their payment quotes? Sometimes, sometimes not. I always double-check. See my new construction guide for what to ask the builder.

I'm an investor. Does this change my numbers? Absolutely. A MUD can wipe out your cash flow. Run it through my free rental cash-flow checklist or visit my investor page.

This is general information, not legal or tax advice. Tax rates change every year; confirm current rates with the Williamson Central Appraisal District, the district itself, or a tax professional.