If you are under contract right now to build a new home in San Tan Valley, the date on that paperwork matters more than it did two weeks ago. As SanTanValley.com reported, on October 1, the town's first-ever sales tax takes effect, and the rate attached to construction has almost nothing to do with the rate attached to everything else the tax touches. That gap is not an accident of drafting. As Rose Law Group Reporter reported, it is the town solving a funding problem it is not legally allowed to solve the way every other Arizona city solves it.
San Tan Valley became Arizona's 92nd municipality in September 2025. For its first several months of existence, it collected no local transaction privilege tax at all, which is Arizona's formal name for what most people call a sales tax. The Arizona Department of Revenue's San Tan Valley tax profile records that the Town Council voted on July 1 to adopt a full tax code, and it takes effect this Thursday.
A Tax With Four Different Numbers
SanTanValley.com's town sales tax guide lists the general rate at 2.25%, and it applies to retail sales, restaurants and bars, rentals, utilities and standard use tax. Layered onto the 6.7% Arizonans already pay in the area (5.6% to the state, 1.1% to Pinal County), the combined rate inside town limits becomes 8.95% starting October 1. Outside the town's boundary, the rate stays at 6.7%, because the town's authority stops where its map does.
Hotels and short-term lodging carry a 4.25% rate, which Councilmember Gia Jenkins noted during the council discussion would apply to Airbnbs even though the town currently has no hotels. Metal mining, a category almost no resident will ever encounter, sits at 0.10%.
Then there is construction, taxed at 5%, more than double the general rate.
| Category | Rate starting Oct. 1, 2026 |
|---|---|
| General retail, restaurants, bars, rentals, utilities | 2.25% |
| Construction contracting | 5% |
| Hotels and transient lodging | 4.25% |
| Metal mining | 0.10% |
| Retail food for home consumption | 2.25% (delayed to Jan. 1, 2027) |
As Pinal Post reported, groceries are the one category that does not start October 1. That piece was pushed to January 1, 2027, and the reason ties back to the statewide ballot measure rather than local budgeting. A measure on the November 3 ballot, referred by the state legislature as House Concurrent Resolution 2021, would require voter approval before any city or town could create or raise a grocery tax, and would cap it at 2%. San Tan Valley's council-set grocery rate of 2.25% sits above that cap. Finance Director Gabe Garcia told the council the delayed start gives the town room to pull the tax back if voters approve the measure before collection ever begins.
Why Construction Got Priced Differently
The 5% construction rate is the number that does not fit the pattern of everything else on that table, and Town Manager Brent Billingsley explained why in plain terms at the same council meeting. Most growing Arizona towns fund new roads, drainage and parks through a one-time impact fee charged to developers when they pull a building permit. San Tan Valley cannot currently do that on a large share of its own housing stock. A change in state law protects lots that Pinal County had already approved through a final plat or site plan before the town adopted its own impact fee ordinance, and that protection runs for roughly 30 months from the July 1 meeting. By the town's own estimate, that covers 6,000 to 7,000 single-family lots already in the pipeline.
Billingsley described the relationship between the two revenue tools directly: "one can be higher than the other, but the total is still the same." Asked where the 5% figure came from, he said it was set specifically as an offset for the development impact fees the town cannot yet collect.
That is the mechanism worth sitting with. The council also directed that every dollar collected under the construction tax go into a fund reserved for infrastructure rather than day-to-day town operations, which keeps the money tied to the same purpose an impact fee would have served.
The Line That Changes the Math
Because the new rate only applies inside town limits, two lots a few hundred yards apart can land on opposite sides of a real cost difference. A home going up inside the boundary carries the 5% construction rate on top of state and county tax. A home going up just outside it does not, because the town's authority ends at its own edge, not at some broader sense of the San Tan Valley area. SanTanValley.com maintains an address-lookup map specifically because the boundary question comes up often enough to need one.
For anyone comparing a lot in San Tan Valley against a similar one in a neighboring East Valley community, this is the detail that a median price alone will not show. Most established Valley cities settled their impact fee structures years ago, so the cost is baked into permit paperwork long before a buyer ever sees a contract. San Tan Valley is working that same math out in real time, in public council meetings, because it has no fee history of its own to fall back on.
The Date That Decides Which Rules Apply
The town's ordinance grandfathers construction contracts signed before October 1. James Ashley, speaking for the Home Builders Association of Central Arizona, thanked the council for honoring those existing agreements, and the exemption holds until a given contract ends or gets renegotiated. The Arizona Department of Revenue has told contractors with qualifying pre-October contracts to contact the town directly for instructions on how that treatment gets applied.
Practically, this means two people building nearly identical homes on the same street can face a different effective cost structure based purely on which side of October 1 their signature falls. Anyone mid-negotiation on a new-construction contract in San Tan Valley right now has a real reason to ask when that contract will actually be executed, not just what the listed price says.
What This Means Beyond October 1
San Tan Valley's population sits near 100,000 and is projected to grow by roughly 27% by 2030. A town that size needs a revenue base to match, and the council was candid about that gap. Vice Mayor Tyler Hudgins and the rest of the council heard directly from residents asking to slow the process down, including a request from resident and write-in council candidate Donna Hallman to delay the vote. Garcia's response was that the timeline had been set months earlier, before the incorporation date itself was even known, and that further delay meant giving up budgeted revenue the town was already counting on.
That tension, between a new town's need for money and residents wanting more time to weigh in, is likely to keep surfacing as San Tan Valley fills in the rest of its tax and fee structure over the next few years. The construction rate landing at 5% while the general rate sits at 2.25% is the first visible result of that process, and it will not be the last place where a number on the page turns out to be doing more than one job.
A Few Questions Worth Asking Before You Sign
Does the new tax apply to buying an existing home, not new construction? The general 2.25% rate applies to categories like retail sales, restaurants, rentals and utilities. The 5% rate specifically targets construction contracting, which is the category that applies to building a new home.
What happens to the grocery tax if the November ballot measure passes? Billingsley told the council that if the statewide measure passes, the town would pull back the food tax before any collection begins, since its January 1, 2027 start date was chosen to allow exactly that kind of reversal.
How do I find out if a specific address is inside or outside town limits? The town's rate only applies within its incorporated boundary. Because that boundary does not always match a resident's general sense of where San Tan Valley starts and ends, checking a specific address against the town's own map is the only reliable way to know which combined rate applies.
Buying new construction in a town that is still writing its own rulebook means the fine print changes faster than it does somewhere with decades of settled fee schedules. If you are weighing a lot in San Tan Valley against something in a more established East Valley community, or trying to time a construction contract around October 1, Mark Palacio can walk through what the current rules mean for your specific timeline before you sign anything.
This article is general information, not legal, tax or financial advice. Consult a qualified professional about your situation.
