NYS Housing and Anti-Discrimination Notice
A Commack address can carry a Town of Huntington tax bill or a Town of Smithtown tax bill, because the hamlet sits in both towns. The town on the bill decides which Assessor values the house, which Receiver of Taxes collects the payment, and which office hears a grievance in May. Here is how we read that split for Commack homes.
TL;DR
- Suffolk County lists Commack as an area in more than one town, with tax map district codes 0400 (Huntington) and 0800 (Smithtown).
- The district code that opens the tax map number on a bill shows which town assessed the parcel.
- Both towns bill for a December 1 to November 30 tax year, with halves due January 10 and May 31.
- The towns assess at different fractions of market value, so assessments on the two sides are not on one scale.
- Both towns take grievance complaints through the third Tuesday in May.
Table of contents
- Why Commack has two tax offices
- Reading the district code on a bill
- Why assessments on each side differ
- Due dates and late interest
- Grievance and exemption dates
- What the split means for a purchase or sale
Why Commack has two tax offices
The Suffolk County Clerk's district code list marks Commack as an area that "lies in multiple townships" and gives it two codes: 0400 for the Town of Huntington and 0800 for the Town of Smithtown. Commack has no village code of its own, so its taxes run through whichever town the parcel sits in.
In each town, the Assessor keeps the roll that apportions the tax warrant for the town, county, school districts and other jurisdictions, and the Receiver of Taxes sends the bills and collects, according to Huntington's Taxes and Assessment page. Smithtown's Receiver of Taxes adds that it does not set tax rates.
Reading the district code on a bill
The county's Tax Map Division identifies every parcel by District, Section, Block and Lot, and the district comes first in that number on a tax bill. On a Commack bill, 0400 means Huntington and 0800 means Smithtown. The mailing address reads Commack either way, so the tax map number is the dependable check.
Why assessments on each side differ
Both towns assess at a small fraction of market value, but not the same fraction. Huntington's grievance page gives a 2026 residential assessment ratio of 0.39 percent and works an example in which an assessment of 4,100 indicates a market value of $1,051,282. The state's 2025 equalization rates, published on data.ny.gov, are 0.45 percent of full value for Huntington and 0.80 percent for Smithtown.
The state's guidance on contesting an assessment gives the conversion: assessment divided by the level of assessment equals the assessor's estimate of market value. So assessments on opposite sides of the town line cannot be compared directly. Smithtown's Assessor answers add that the assessment sets each property's share of a levy, not the tax itself.
Due dates and late interest
Both towns send one bill a year in December for a December 1 to November 30 tax year. The first half is due without penalty by January 10 and the second half by May 31. Huntington moves weekend due dates to the next business day; its payment page lists January 11 and June 1, 2027 for the 2026/2027 bill. Smithtown says there are no grace periods and extended the 2026 second-half date to June 1.
Huntington's Receiver of Taxes adds 1 percent interest per month to an unpaid first half after January 10, reaching 5 percent by May 31. After May 31, unpaid taxes go to the Suffolk County Comptroller with a 5 percent penalty plus 1 percent monthly interest from February 1.
Grievance and exemption dates
Huntington side
Grievance complaints go to the Assessor's Office by the third Tuesday in May. The 2026/2027 period has ended; 2027/2028 details are expected in April 2027.
Smithtown side
Smithtown's key dates list March 1 as the taxable status date and exemption filing deadline, a prior-year July 1 valuation date, a tentative roll on May 1, Grievance Day on the third Tuesday in May, and a final roll on July 1. The appeal page describes an informal review with the Assessor, then a complaint to the Board of Assessment Review.
In 2027 the third Tuesday in May is May 18. State guidance calls Grievance Day "typically the fourth Tuesday in May" and says to confirm locally, so the town calendar counts.
What the split means for a purchase or sale
The district code on the current bill answers three questions at once: which Assessor values the house, which Receiver collects, and which office takes a grievance in May. We start every Commack tax question there. Buying and selling: buyers guide and sellers guide.
