In South Celina's Prosper ISD Pocket, the School Line Isn't What Splits Your Tax Bill. The PID Is.

Say you are cross-shopping two Celina communities that sit inside the same golden triangle of Prosper ISD zoning, both in the $700s, both with a resort pool and a lazy river on the amenity map. Which number on the builder's price sheet actually tells you what you will pay to live there for the next ten years?

Most buyers guess it is the school district line. In this specific pocket of South Celina, that guess is wrong, and the research to prove it comes straight from a builder's own paperwork.

The rounding error hiding inside Lilyana's own numbers

Lilyana sits across a boundary that puts part of the community in Celina ISD and part in Prosper ISD, which is exactly the kind of split that makes buyers nervous about picking the "wrong side" of a subdivision. Hillwood, the community's own master developer, published both rates on its FAQ page as of late 2025: 2.016464 per $100 of assessed value for the Celina ISD side, and 2.021664 for the Prosper ISD side. Rates reset annually, so treat these as the benchmark to verify against, not the final word for this tax year.

Run that gap on a $700,000 home and it comes out to about $36 a year, or roughly three dollars a month. That is not a rounding error you should lose sleep over. It is close enough to be a literal rounding error on a mortgage statement.

If the tax rate itself barely moves between the two school zones inside a single community, then the school line is not the mechanism doing the real work in a buyer's total cost comparison. Something else is, and it shows up as a separate line item entirely: the Public Improvement District assessment, and whether the community you are comparing it to has one at all.

What a PID actually is, and why it is not the same animal as a MUD

Every fast-growing corner of Collin County eventually makes a buyer sit through the PID-versus-MUD conversation, and most explanations blur the two together because both show up as extra charges on top of standard property tax. They are not the same financing tool, and the difference matters most at the exact moment you are deciding between two similarly priced homes.

Mustang Lakes, one of the anchor communities in this Prosper ISD pocket, spells out the distinction in its own buyer FAQ: the community sits inside Mustang Lakes Public Improvement District #1, a district the developer describes as being "within the city limits," which the FAQ says ensures residents get standard city services. The same document notes the assessment funds water lines, sewer lines, storm drainage, and streets, that it can run up to 30 years, and that it can be prepaid by the homeowner at any point.

Lilyana's own FAQ describes the same structure with slightly different terms: a PID assessment that can be prepaid at any time or spread over 28 years, funding water, sewer, drainage, roads, and open space, layered on top of an HOA that was listed at $1,095 a year as of late 2025.

A Municipal Utility District works differently. It is a separate taxing entity created to fund the same kind of infrastructure in areas without existing city utilities, and the assessment attaches to the district's own bond schedule rather than to any one lot. That means an individual homeowner cannot simply write a check and retire a MUD tax the way Mustang Lakes or Lilyana residents can retire their PID assessment. It rides with the land until the district itself pays down its debt, which for most Texas MUDs takes decades. Light Farms, elsewhere in this same neighborhood grouping, was built out through a Municipal Utility District rather than a PID, which means a Light Farms buyer and a Lilyana buyer are looking at two structurally different exit ramps for the same category of charge, even though both communities market themselves on nearly identical amenity language.

That prepay option is the whole ballgame for anyone thinking about resale ten or fifteen years out. A PID assessment you have already paid off disappears from the tax bill for good. A MUD tax is still sitting there for the next buyer to inherit, whether or not you ever benefited from the infrastructure it built.

The part the builder's finance sheet does not spell out

Here is where the mechanism gets expensive in a way that has nothing to do with school zoning at all. Lilyana's FAQ is candid that the PID assessment amount varies by lot size and tells buyers to ask their builder's sales representative for the exact figure rather than publishing a table. That is a reasonable way to handle a variable cost, but it also means the number a buyer sees on move-in day is not always the number on the model home's glossy price sheet.

The same pattern shows up on the ad valorem side. In a lot of new Celina construction, the first year's property tax bill gets calculated off the land value alone, because the county has not yet fully assessed the finished structure. That first-year estimate is the number most buyers see when a lender qualifies them, and it is often lower than what the bill becomes in year two once the house itself is on the roll. A buyer comparing two nearly identical price tags in this Prosper ISD pocket needs the full combined number, not the closing-day snapshot, to know what they are actually signing up for.

This is now the default across South Celina, not a quirk of two communities

It would be easy to read Mustang Lakes and Lilyana as the outliers here, the two communities in this Prosper ISD pocket that happen to use PID financing while everything else plays it straight. The City of Celina's own list of active Public Improvement Districts says otherwise, at least for their nearest neighbors. Cambridge Crossing and Creeks of Legacy, both zoned into this same south Celina, Prosper ISD footprint, carry their own 2025-26 Annual Service Plan Updates on file with the city, the same annual filing Mustang Lakes and Lilyana go through. The city's full roster runs well past this pocket too, covering districts like Cross Creek Meadows and Edgewood Creek over toward east Celina and Glen Crossing out west, which tells you PID financing is not a quirk of one subdivision. It is how Celina is paying for roads and sewer lines in most places new construction is going up right now.

Which means the useful question for a buyer in this pocket of South Celina is not "does this community have one of these special districts." At this point, assume it does. The useful question is which kind, at what rate, and on what prepay terms, because those variables are what actually separate one $700,000 listing from another that looks identical on the surface.

Three questions worth asking before you compare two price sheets

1. Ask whether the community sits inside a MUD, a PID, or both, and get the answer in writing before you write an offer, not after you are already under contract.
2. Ask for the specific per-lot PID assessment amount and whether the builder's advertised monthly payment already includes it or adds it on top.
3. Ask whether the first year's tax estimate is based on land value alone, and ask what the bill is projected to become once the finished structure hits the county roll.

None of those questions will show up on a builder's glossy handout. They are the ones a buyer's agent who has walked this exact stretch of Prosper ISD zoning knows to ask before a number gets locked in.

If you are cross-shopping new construction anywhere in this South Celina pocket, from Mustang Lakes to Lilyana to the newer PID-financed sections filling in around Cambridge Crossing and Creeks of Legacy, Brent Wells spends most of his week inside exactly this kind of builder paperwork. He can pull the actual per-lot assessment before you tour a model home, not after you have already fallen for the kitchen island. Reach out through LivingWell Realty and we will walk the real numbers with you side by side, the way we would for our own family.