If you're comparing two Spring Hill homes by their tax history, last year's bill on a Maury County address may overstate this year's cost compared with Williamson County. The two sides are about 10 cents apart per $100 of assessed value now. Using the Maury County rate in effect before this year, the gap was about 64 cents. Maury County caused that change by revaluing every property in 2026 and then cutting its rate by more than a quarter.
The county line still matters. What has changed is why it matters. On the Maury side, the bill now depends mostly on how much one particular home's appraisal rose compared with the rest of the county. It no longer depends much on the county itself.
The Rates, Side by Side
Spring Hill sends its own city tax bill to both counties at the same rate. For the fiscal year running July 1, 2026 through June 30, 2027, Ordinance 26-09 sets $0.739 per $100 of assessed value for properties in Maury County and the same $0.739 for properties in Williamson County. The difference comes from the county layer.
On the Maury side, the county rate used to be $1.91 per $100. The Maury County Commission adopted a new certified, revenue-neutral rate of $1.369 with its FY 2026-27 budget, which Main Street Maury reported as a 28 percent drop. On the Williamson side, the County Commission adopted a $1.30 countywide rate on June 18, 2026. The University of Tennessee's County Technical Assistance Service lists $1.27 for property inside Spring Hill. That 3-cent difference equals the solid-waste line in Williamson's FY 2026-27 rate table.
| Spring Hill address in... | County rate per $100 assessed | City rate per $100 assessed | Combined |
|---|---|---|---|
| Maury County, before the 2026 reappraisal | $1.91 | $0.739 | about $2.649 |
| Maury County, FY 2026-27 | $1.369 | $0.739 | about $2.108 |
| Williamson County, FY 2026-27 | $1.27 | $0.739 | about $2.009 |
Here's what that means in dollars. In Tennessee, residential property is assessed at 25 percent of appraised value. Spring Hill's citywide median sale price in July 2026 was $634,500 across 30 single-family closings, with an average of 22 days on market. Suppose a home on each side had that same $634,500 appraisal:
- Maury side, old county rate: roughly $4,202 a year
- Maury side, FY 2026-27: roughly $3,344 a year
- Williamson side, FY 2026-27: roughly $3,187 a year
The yearly difference at that price drops from about $1,015 to about $157. These numbers just show how the rates compare. They don't predict any real home's bill, because a real bill depends on that parcel's own appraisal and any exemptions.
Why the Maury Rate Fell When Values Rose
When Tennessee counties reappraise, the law requires the change to be revenue-neutral. Maury County Property Assessor Bobby Daniels explained it to Main Street Maury this spring. Total assessed value of all property in Maury County rose 43.17 percent from 2025 to 2026, so the State Board of Equalization gave the county a lower certified rate that brings in about the same money from existing properties as the year before.
"The county and municipalities can't benefit off the value change during a reappraisal… If property values started declining, the offset would be a higher tax rate."
The rule balances out for the county as a whole. It doesn't balance out house by house. Daniels said that an owner whose valuation rose more than 43.17 percent should expect a higher bill than last year. An owner whose valuation rose 43.17 percent or less should be billed less.
That changes how a buyer should read a seller's tax history. On the Maury side of Spring Hill, the 2025 bill was calculated with a rate and a valuation that have both been replaced. To estimate the new county portion, compare the home's 2026 appraisal with its 2025 appraisal and see whether the increase was above or below the county's 43.17 percent. Keep in mind that 43.17 percent describes the whole county's assessed value. It isn't the change for a typical house.
The City Portion Didn't Follow the Same Rule
Spring Hill's piece of the bill works differently. The State Board of Equalization certified a city rate of $0.6476 per $100 for both the Maury and Williamson portions of Spring Hill after reviewing the 2026 assessment data. The Board of Mayor and Aldermen kept the rate at $0.739 instead. That required the public hearing state law calls for when a rate exceeds the certified rate. The finance department's memo estimated the choice would bring in about $3.1 million above what the certified rate would have produced.
The city did the same thing the year before, when Williamson County reappraised. In May 2025, Spring Hill acknowledged certified rates of $0.6760 for its Maury portion and $0.5353 for its Williamson portion. Then in June 2025 it passed a budget at $0.739. The Williamson Herald reported that the Williamson-side reassessment would add more than $3.7 million in city property-tax revenue at that unchanged rate.
So in two straight years, each side of the line has had its values reset while the city rate stayed the same. On the Maury side this year, the county portion follows the revenue-neutral rule. The city portion rises along with the home's new appraisal. A Maury-side homeowner whose value went up 43 percent pays about the same county tax as last year and a larger city tax.
The Line Runs Through the Neighborhoods
The county line runs through the middle of Spring Hill, and you can't always tell where it is from the street. The City's 2016 special census counted 9,954 of 36,530 residents in Maury County, about 27 percent. That figure is ten years old, so it only gives a rough sense of the split. Broadly, Williamson is to the north and Maury is to the south. Local records place these communities on the Maury side:
- Southern Springs, off Kedron Road and Saturn Parkway, is on Spring Hill's Maury County side, according to the Columbia Daily Herald.
- Harvest Point is identified by the Columbia Daily Herald as a Maury County development.
- Reserves at Port Royal Phase 5 has recorded plats labeled "MAURY COUNTY - SPRING HILL, TENNESSEE."
The Port Royal area shows why a neighborhood name isn't enough. A city resolution adopted in December 2025 for Dartford Townhomes cites recorded plats in both Maury and Williamson counties. Two homes in the same development can be billed by different counties.
The mailing address won't settle it either. Williamson County's property search notes that its "City" field means the tax authority, which can differ from the mailing city. Before you compare two homes, check each parcel with one of these tools:
- The City's Spring Hill GIS Data Viewer, to see the parcel on a map
- Williamson County's property search, which lets you filter by Spring Hill
- The Comptroller-hosted TN Property Viewer, which works for either county and sends parcel questions to that county's assessor
Once you know the county and the current appraisal, you can multiply 25 percent of the appraised value by the combined rate for that side.
What's Still Moving
Maury County's new rate is a starting point, and it may not stay put. Main Street Maury reported that the FY 2026-27 budget is projected to run a $14.5 million deficit over property-tax revenue. Budget Committee chair Scott Sumners told the paper he expects revenues to overperform, and that "I still want to get to where we have a true balanced budget." Williamson County's budget document lists the school construction, juvenile facility, jail, and courts projects it is planning to fund. Rates on both sides get reset every budget season, and the gap between them could change again.
A Few Common Questions
Does the Maury side still cost more in property taxes? At the rates for FY 2026-27, yes, by about 10 cents per $100 of assessed value. For a home appraised at $634,500, that comes to roughly $157 a year at identical appraisals. Before the reappraisal, the gap was much larger.
If I'm looking at a Maury-side home, is the seller's 2025 tax bill useful? Only as background. The 2025 county portion used the old $1.91 rate and the old valuation. A current estimate starts from the 2026 appraisal and the $1.369 county rate. The city rate is still $0.739.
Can I assume a whole subdivision is in one county? No. Dartford Townhomes has recorded plats in both counties. Check each address in a parcel tool instead.
Did Spring Hill raise its tax rate? The rate stayed at $0.739. Because it's above the $0.6476 certified rate, the city expects about $3.1 million more than revenue neutrality would have produced.
If you own a home on either side of the Spring Hill county line and want to know how its value compares with the latest reappraisal, Mary Brown can walk through recent sales near your street with you and tell you what she finds. Request Your Home Valuation, and we'll begin with your parcel's current appraisal.
