LONG ISLAND TAX TRIM (516) 518-6678

Paying too much property tax in Nassau County? We'll find out, and fix it.

Long Island Tax Trim files your assessment grievance with the county for you. Our fee is 30% of your first-year savings, and only if you win. Most firms charge 50%.

No reduction, no feeNothing to pay up front, and nothing at all if the county doesn't lower your assessment.
30%, not 50%On $2,000 of yearly savings you keep $1,400 with us, against $1,000 at a typical firm.
Run by a CPALed by Xiongwei Li, CPA, of Li CPA Group. You deal with a professional who answers the phone.
Your taxes can't go upNassau County states a grievance will never increase your assessment.

What a grievance is

Your property tax is based on the value the county assigns to your home. If that value is too high compared with similar homes, you can ask the county's Assessment Review Commission to lower it. That request is called a grievance. Many Nassau homeowners file every year. Those who never file often pay more than their neighbors for a similar house.

How it works

  1. Today: sign up. Two minutes, no payment.
  2. Within two business days: we send you the county's authorization form. Nothing is filed until you sign it.
  3. January 4 to March 1, 2027: we research comparable sales and file your grievance with Nassau County's Assessment Review Commission.
  4. The county decides. If your assessment is reduced, the lower figure applies to the 2028/29 tax year and you pay us 30% of that first year's savings, once. If it isn't reduced, you pay nothing.

Who we are

Long Island Tax Trim is run by a CPA, not a call center. The firm is led by Xiongwei Li, CPA, of Li CPA Group, an accounting practice serving New York families and small businesses.

  • Registered New York company: Long Island Tax Trim LLC, NY Department of State ID 8037109.
  • Accounting practice: licpanyc.com
  • You can reach a person: (516) 518-6678

We do one thing here: check whether Nassau County homeowners are over-assessed and file the paperwork to fix it. We charge less because the research is largely automated.

No letter? Ask for a free review

We'll tell you what we find. No cost and no obligation.

Questions

Can filing a grievance raise my taxes?

No. Nassau County states that its Assessment Review Commission will never increase an assessment as a result of a grievance. The worst outcome is that your assessment stays the same. See the county's page.

What does it cost if I don't get a reduction?

Nothing. There is no sign-up fee and no filing fee. You owe us only if the county reduces your assessment.

Why 30% when other firms charge 50%?

Most of the work is finding comparable homes and filing on time. We automate the research, so we can charge less and still do the job properly.

I already signed with another firm. Can I switch?

Only sign one authorization per year. The county denies duplicate filings, so if another firm is already authorized for this year, stay with them or cancel with them in writing first.

Do I have to do this every year?

A grievance covers one tax year, so most homeowners file annually. We'll contact you before each filing window, and you decide each year whether to continue.

Can I do this myself?

Yes. Any homeowner can file with the county at no charge. We do the comparable-sales research, the filing and the follow-up for you.