Diagnostic checklist (work in order)
- Step 1: Compare assessed values — If your Total Assessed Value or Taxable Assessed Value changed, the assessor reassessed you. Common in Nassau (every year). If significant, file a grievance.
- Step 2: Compare exemption section line-by-line — Most common cause of unexpected increase. Lost STAR (didn’t renew, income too high, ownership changed), lost Senior (didn’t return IVP letter), or lost Veterans (filing lapsed).
- Step 3: Check school district rate — Schools account for 60–75% of bill. A 5% school district rate increase translates to ~3–4% total bill increase. Compare current year rate to prior year on the bill.
- Step 4: Check county and town rates — County: ~$3-4/$1k. Town: $2-5/$1k. Both can change annually. Generally smaller impact than school rate changes.
- Step 5: Check village rate (if you’re in one) — About 60 LI villages. Village rate can vary 5–15% year over year, especially after a budget vote.
- Step 6: Check special districts — Fire district, library district, ambulance, sewer, water — each can change independently. A new bond issue at the fire district level can add $50-$200/yr.
- Step 7: Check for new home improvements — If you renovated/built last year, the assessor may have added the improvement to your bill this year.
What to do once you find the cause
Lost exemption
- Re-register for STAR at tax.ny.gov/star
- Re-file Senior or Veterans exemption with your assessor
- If lapsed only for one year, you typically cannot recover that year retroactively — but you can be re-included for the next year
Reassessment / over-assessment
- File a grievance the next available cycle
- Nassau: by March 31, 2026
- Suffolk: by third Tuesday of May (May 19, 2026)
Higher rate
- Limited recourse — the rate is set by elected boards. You can attend school board, town board, or village board meetings to advocate for budget discipline
- NY State’s 2% property tax cap limits annual growth in most jurisdictions
New home improvement / accessory unit
- If you built a permitted addition, deck, pool, ADU — the assessor added it
- Check whether your town offers a Home Improvement Exemption for short-term phase-in
Frequently asked questions
My bill went up 12% but the rate cap is 2%. How?
The 2% cap applies to the school district’s total levy, not your individual bill. If your assessment went up faster than the district average, your share of the levy increases more. Also: village + special districts have separate caps; school cap is just one piece.
Can my bill go up if my house didn’t change?
Yes. The taxing jurisdictions (school, town, county, village, specials) can each increase their levy. Even at a stable assessment, you pay more if the rates rise.
My bill went up 30% — is that legal?
It’s unusual but possible. A combination of reassessment + lost exemption + village levy increase can stack to large swings. Check each line item to identify the contributors. If reassessment is the cause, grieve.
Get one email when LI tax rules change
Grievance deadlines, STAR limit updates, new exemption laws. One short email, only when something actionable happens. Unsubscribe in one click.
Sources and citations
- NY General Municipal Law § 3-c — Property tax levy cap statute nysenate.gov
- NY Tax & Finance — Property tax calendar tax.ny.gov
Last verified May 11, 2026. Tax rules change; we re-check every page each quarter.
Educational content and estimates only, not legal, tax or financial advice. Verify with your county or town receiver, an attorney or a CPA before making financial decisions.