What it is. Tax preparation, planning, and representation for Nassau County businesses and their owners, led by a New York-licensed CPA: business and personal returns, year-round planning, and standing before the IRS and New York State.
What a CPA adds. A state license, professional accountability, and unlimited rights to represent you before the IRS. When there are real decisions or a real notice, that difference matters.
What we do not do. Audits, reviews, and compilations. Those reports require a NYSED-registered public accounting firm, which Corviniti is not, and we say so up front.
Corviniti provides bookkeeping, accounting, and tax services to small businesses across Nassau County, from Mineola and Garden City to Hempstead, Great Neck, Hicksville, and Long Beach. Nassau anchors the western half of Long Island's economy, and it files under New York rules with the downstate MCTMT that upstate businesses avoid.
A CPA is a state license that carries professional accountability and unlimited rights to represent a taxpayer before the IRS. For Nassau County, a licensed CPA can represent you before both the IRS and the New York State Department of Taxation and Finance, where sales tax audits and residency questions are the most common matters. Corviniti is an accounting and tax company led by a New York-licensed CPA.
Corviniti keeps books, plans tax, and files returns for Nassau County businesses under one roof, led by a CPA with Big Four experience. The full Long Island tax detail behind this service is on our Long Island CPA page; what it means for Nassau County is below.
This page sits under Corviniti Accounting in New York City, our New York headquarters. That page covers the full New York City and New York State picture, and links to the rest of our local coverage.
Who can represent you
CPA, EA, attorney, preparer: what the credential means
Not every tax preparer can stand between you and the IRS. What each credential is licensed to do.
Tax credentials compared. Illustrative.
Representation
Responding to a tax notice
An IRS or New York State notice is a deadline with consequences. The path a CPA runs from notice to resolution.
Responding to a tax notice. Illustrative.
This is for you if
You received an IRS or New York State notice or audit letter and do not want to face it alone.
Your return has outgrown a seasonal storefront: K-1s, multi-state income, or owner compensation questions.
You want the person who signs your return to be licensed and accountable for it.
You want a straight answer on whether you actually need audited or reviewed statements.
What you get
A licensed CPA on the work Planning and returns by a CPA who is accountable for them and can represent you before the IRS.
Representation on two fronts Notices and audits handled before the IRS and the New York State Department of Taxation and Finance.
Sales tax and residency defense The records and the response that answer a New York sales tax audit or residency question.
A straight answer on assurance If you truly need a reviewed or compiled statement, we say so and help you engage a registered firm.
How We Help
What you get
A CPA-led CPA relationship for Nassau County businesses, priced flat, with the Long Island tax detail handled.
A licensed CPA on the workPlanning and returns by a CPA who is accountable for them and can represent you before the IRS.
Representation on two frontsNotices and audits handled before the IRS and the New York State Department of Taxation and Finance.
Sales tax and residency defenseThe records and the response that answer a New York sales tax audit or residency question.
A straight answer on assuranceIf you truly need a reviewed or compiled statement, we say so and help you engage a registered firm.
When companies bring us in
You received an IRS or New York State notice or audit letter and do not want to face it alone.
Your return has outgrown a seasonal storefront: K-1s, multi-state income, or owner compensation questions.
You want the person who signs your return to be licensed and accountable for it.
You want a straight answer on whether you actually need audited or reviewed statements.
The Detail
The gaps, and how we close each one
Service 01
The businesses Nassau County depends on
The books and tax work should fit the local economy. Here is what Nassau County's looks like and why it shapes the work.
How we handle it
Nassau County's small-business base leads with healthcare, anchored by Northwell Health, the state's largest private employer, headquartered in New Hyde Park. Around it sit dense professional and financial services in Mineola and Garden City, retail and hospitality, the construction and real estate trades that come with some of the country's highest home values, and an aerospace and defense engineering legacy in Bethpage, where Grumman built the lunar module and Northrop Grumman still operates. Education is a real employer too, with Hofstra in Hempstead and Adelphi in Garden City. Many of these are professional practices, trades, and partnerships whose books have to carry job-level or practice-level detail and the MCTMT that Long Island employers owe. We keep them in that shape.
Facing an IRS or New York State notice? Talk to a licensed CPA before you respond.
A tax notice or audit letter is a deadline with consequences, and for a Nassau County business the two agencies that send them are the IRS and New York State.
How we handle it
As a licensed CPA, Ro represents taxpayers before both the IRS and the New York State Department of Taxation and Finance: reading the notice, responding on the record, and dealing with the examiner directly. New York sales tax audits and residency questions are the most common, and the preparation for them starts with the clean records we keep.
Service 03
Nassau County and New York resources for owners
The registrations and filings Nassau County owners ask about most are spread across state and county offices, each with its own rules.
Yes, as a licensed CPA. Past the return, that means representation if New York examines your sales tax, which for the trades usually depends on capital-improvement certificates (Form ST-124) and worker classification, employee versus 1099. We plan the entity and elections during the year and deal with the agency directly if a notice comes.
Do you work with medical and dental practices?
Yes, as a licensed CPA. We plan the entity, compensation, and retirement structure that lowers the tax on a high-income practice, sign the returns, and represent the practice if the IRS or New York questions owner compensation or the filing.
Do you work with restaurants and bars?
Yes, as a licensed CPA. Restaurants draw New York sales tax examinations more than most businesses, and the exam depends on tying point of sale records to the returns and the deposits. We keep the records that answer it, represent you if the state opens one, and claim the FICA tip credit on the return.
Do you work with e-commerce and retail sellers?
Yes, as a licensed CPA. The exposure for online sellers is multistate sales tax nexus and the marketplace facilitator rules, which generate most of the notices. We plan the nexus footprint, file the returns correctly, and represent you on state notices.
Do you work with law firms and professional services?
Yes, as a licensed CPA. That covers the trust-accounting discipline bar regulators expect, the PTET planning that is often a partner group's biggest lever, and representation before the IRS or New York if a return is questioned.
Do you work with real estate investors?
Yes, as a licensed CPA. We plan depreciation, cost segregation, passive-loss and real estate professional positions, and 1031 exchanges, and we defend those positions if the IRS examines them, since the aggressive ones draw scrutiny.
Do you work with businesses across all of Nassau County?
Yes, from Mineola and Garden City to Hempstead, Great Neck, Hicksville, and Long Beach. The work is done remotely on QuickBooks Online or Xero, so where in Nassau you sit does not change the service. What matters is that your books reflect the 8.625 percent Nassau sales tax and the MCTMT that Long Island employers owe.
Is Corviniti a CPA firm?
No. Corviniti is an accounting and tax company led by a New York-licensed CPA, not a public accounting firm registered with the New York State Education Department. Accordingly, we do not perform audits, reviews, or compilations of financial statements, the engagements a registered firm performs under professional standards (audits under the auditing standards, and reviews and compilations under the SSARS, the Statements on Standards for Accounting and Review Services). Tax preparation, planning, representation, and accounting do not require firm registration, and that is the work we do.
This page summarizes New York State tax rules for general information, and is not tax advice for your situation. Rates and thresholds change; confirm the current figures with the authority before you rely on them.
