Suffolk County, NY property tax
Official source data 2024
On a $400,000 home in Suffolk County
Reported data is unavailable.
Missing, suppressed, or open-ended Census values prevent a reliable effective-rate estimate here. Use your assessed value and tax rate in a statutory scenario.
Make it your number.
Your actual bill depends on your local assessment, exemptions, and taxing districts.
The county context.
Rank runs from highest to lowest among counties with usable ACS medians. County medians may describe different households and cannot replace parcel-level figures.
Neighboring counties
| County | Effective rate | Same-value estimate | Median tax paid |
|---|---|---|---|
| Western Connecticut Planning Region, CT | 1.42% | $5,695 | $9,295 |
| South Central Connecticut Planning Region, CT | 1.91% | $7,657 | $6,759 |
| Greater Bridgeport Planning Region, CT | 2.02% | $8,088 | $8,670 |
| Southeastern Connecticut Planning Region, CT | 1.62% | $6,466 | $5,228 |
Up to four adjacent counties with usable ACS medians, ordered by population. The 2026 Census adjacency file includes point contacts and boundaries in water.
What can change your bill?
The ACS effective rate is a ratio of medians, not a statutory rate. Local assessed values, levies, classification, caps and exemptions determine the actual bill.
Exemptions & assessment
No uniform flat exemption is applied. Enter your assessor-provided assessment ratio and qualifying exemption for a separate statutory scenario.
Payment dates & appeals
School bills commonly arrive in September and county/town bills in January. Calendars differ in some counties, cities and villages; confirm the payment deadline with that tax collector.
Grievance Day is the fourth Tuesday in May in many towns, but local exceptions are extensive. Form RP-524 must be received by the relevant deadline; verify your municipality's assessment-roll calendar.
Check New York’s official property-tax guidance
Official local guidance
Town and some village assessors perform assessments. Local tax rates and assessment percentages differ; Suffolk does not have a county Board of Assessors.
Use an assessed value, exemption, and local millage
This separate scenario needs your assessor’s inputs. An exemption applies only to eligible levies; do not apply it to the county’s historical effective rate.
Good questions. Clear answers.
How much is property tax on a $400,000 home in Suffolk County?
A reliable effective-rate estimate is unavailable because Census medians are missing, suppressed, or open-ended.
Is the effective rate the rate on my tax bill?
No. It is median real-estate taxes paid divided by median home value in the ACS 2020-2024 survey. Your taxing districts, assessed value, classification and exemptions determine your bill.
Can I subtract a homestead exemption from this estimate?
Use the separate statutory scenario with a qualifying levy. Subtracting an exemption from an ACS effective-rate estimate can double-count relief already reflected in taxes paid.
Does a higher purchase price change my assessment?
Assessment rules and reassessment dates vary by state and locality. Contact the linked official property-tax office before relying on a historical county ratio.
How do I appeal a property-tax assessment?
Read the deadline and procedure on your assessment notice, then use the official state guidance above to locate your assessor or review board. County survey data does not establish your appeal deadline.
Check the source.
Data as of 2024. Retrieved .
- www2.census.gov / Geos20245YR.txt
- www.census.gov / notes-on-acs-estimate-and-annotation-values.html
- www2.census.gov / acsdt5y2024-b01003.dat
- www2.census.gov / acsdt5y2024-b25077.dat
- www2.census.gov / acsdt5y2024-b25103.dat
- www2.census.gov / acsdt5y2024-b25064.dat
- www2.census.gov / acsdt5y2024-b19013.dat
- www.suffolkcountyny.gov / Budget-and-Management As of Guidance reviewed 2026-10-02
- www2.census.gov / county_adjacency2026.txt As of 2026
- www.census.gov / county-adjacency.html As of 2026
- www.tax.ny.gov / property As of 2026-10-02
- www.tax.ny.gov / proptaxbill.htm As of 2026-10-02
- www.tax.ny.gov / proptaxcal.htm As of 2026-10-02