Tax projections for Brentwood households

County

Williamson County

Property tax (per $100 assessed, 2025)

1.30 + 0.19 = 1.49

Sales tax, combined

9.75%

County Trustee

Karen L. Paris · Franklin

Assessor of Property

Brad Coleman · Franklin

Population, 2020 → 2024

45,384 → 45,525

State and city business tax

Filed with the TN Department of Revenue

Straight-line distance

7.2 miles from Franklin

Sources: TN Comptroller, TN Department of Revenue, U.S. Census Bureau. Details

Brentwood’s rate is 1.49 per $100 of assessed value for tax year 2025: Williamson County’s 1.30 and the City of Brentwood’s 0.19. The city’s piece is small, lower than Franklin’s 0.296, so most of a Brentwood bill is county tax.

The bill comes from Williamson County Trustee Karen L. Paris, whose office is at 1320 West Main Street, Suite 203, in Franklin. Values are set by Assessor of Property Brad Coleman, in Suite 300 of that building. Census estimates put Brentwood at 45,525 residents in July 2024, only 141 more than the April 2020 count of 45,384, so the city has held nearly level while Franklin and Nolensville grew. The neighboring figures for each place Haven covers are on the service areas page.

For tax year 2025 the federal deduction for state and local taxes is capped at $40,000, or $20,000 for married filing separately, according to the IRS instructions for Schedule A. Above $500,000 of modified adjusted gross income the cap phases down, and it can fall to a floor of $10,000.

Property tax paid to Williamson County is a local tax, so it counts toward that cap for anyone in Brentwood who itemizes. Income close to the phase-down line changes how much of the total is usable, which is why the figure gets checked before the year closes and again at filing.

The IRS hasn’t posted the 2026 figure yet. Until it does, Haven’s tax planning works from the 2025 rule and updates the numbers when the next instructions appear.

A projection estimates next year’s federal liability while there is still time left in the year to change it. Projections sit within Haven’s tax advisory work, and the old site describes them as “detailed liability projections,” offered alongside tax education and answers to specific questions.

The inputs are the figures that move from one return to the next: wages and bonuses, investment income, estimated payments already made, and deductions that shrink as income rises. Several deductions written for 2025 through 2028 phase out by income, so a household near one of those lines gets more from a mid-year projection than from a look back in April. The projection is reviewed in person at the Seaboard Lane office in Cool Springs.