Service Areas We Serve
Sundack CPA supports businesses, professionals, and investors across New York City, Long Island, and throughout several other states.
We handle the accounting, tax, and financial systems that keep your operation running without surprises — no matter where you’re based or how many jurisdictions you operate in.
New York has some of the strictest compliance rules in the country, and most of our clients either operate here or have long-term connections to the state. We manage the numbers so your books stay accurate, your filings stay on track, and your decisions stay grounded in clean financial data.
At Sundack CPA, your success is our priority. We’re not just expert CPA's —we’re your financial partners, committed to helping you grow and thrive.
Ready to see the Sundack CPA difference? Connect With Us Now!
Questions? Let's Connect
Where We Serve Clients
We work with clients across several regions, each with its own set of accounting and tax requirements. Our focus isn’t limited to a single market — we support companies, professionals, and investors wherever their operations or obligations exist.
New York City
We serve clients in all five boroughs. Most NYC businesses deal with strict tax rules, intensive reporting, and shifting regulations. Our team handles the accounting, tax planning, payroll, sales tax, and audit response work that NYC companies rely on.
Long Island
We support businesses throughout Nassau and Suffolk counties. Long Island companies depend on structured accounting, clean books, predictable cash flow, and ongoing tax planning. We manage the financial systems that keep these businesses steady year-round.
Clients Outside of New York
Many of our clients operate in other states or split work between multiple locations. We support businesses and investors in Florida, New Jersey, Connecticut, Delaware, Illinois, Pennsylvania, Texas, California, and other states tied to New York through residency, payroll, sales, or property ownership.
Multi-State Operations
Modern businesses rarely stay inside one state line. We assist companies with multi-state tax filings, sales tax compliance, nexus requirements, remote employees, out-of-state rentals, and cross-state payroll. As clients expand, we keep the entire financial picture organized across every jurisdiction.
At Sundack CPA, your success is our priority. We’re not just expert CPA's —we’re your financial partners, committed to helping you grow and thrive.
Ready to see the Sundack CPA difference? Connect With Us Now!
Questions? Let's Connect
New York City
New York City demands accuracy. Businesses here deal with additional tax layers, complex regulations, and tighter oversight. We work with clients throughout Manhattan, Brooklyn, Queens, the Bronx, and Staten Island.
What We Do in NYC
Monthly accounting and bookkeeping
Corporate, partnership, and individual tax preparation
Year-round tax planning
Payroll management
Sales tax compliance
Audit support with NYC and NYS agencies
Guidance on UBT exposure and entity structure
Our NYC workflow is built to keep businesses compliant and prepared for scrutiny.
Who We Support in NYC
Restaurants
Medical and dental practices
Law firms
Real estate investors
Contractors and trades
Tech companies and MSPs
Retail and franchise operators
Consultants and solopreneurs
Long Island
Long Island companies rely on steady accounting and forward planning. We support organizations across Nassau and Suffolk, from small service companies to established firms managing multiple locations.
What We Do in Long Island
Month-end financials and reconciliations
Payroll processing
Sales tax filings
Year-round tax planning
Real estate accounting and investment support
Clean records ready for banks, partners, or potential audits
Who We Support in Long Island
Contractors and home service businesses
Medical practices
Family-owned companies
Real estate investors
Retail and local service providers
Professional service firms
Growing businesses preparing to scale
Clients Outside of New York
Not all our clients operate in New York — many work fully outside the state or manage business activity across several regions. These clients choose us because they want accounting that stays consistent no matter where their operations are located.
Where Our Out-of-State Clients Operate
We support businesses and investors in:
Florida
New Jersey
Connecticut
Delaware
Illinois
Pennsylvania
Texas
California
Georgia
…and other states that share economic ties with New York.
Who We Support Outside NY
E-commerce sellers shipping nationwide
Remote-first companies with employees in multiple states
Real estate investors with multi-state rental portfolios
Professional service firms with clients across the U.S.
Individuals relocating from New York to low-tax states
Multi-entity owners managing income from several jurisdictions
We keep books aligned, taxes accurate, and filings consistent — without making you deal with multiple firms in different states.
Multi-State Accounting & Tax Support
Multi-state obligations create complexity quickly: different tax rules, different filing schedules, and different payroll requirements. We manage all of it under one organized system.
When Multi-State Issues Come Up
Typical triggers:
Hiring remote employees
Opening locations or working in more than one state
E-commerce sales across multiple states
Exceeding economic nexus thresholds
Owning rental property in different jurisdictions
Relocating from New York to another state
Managing multi-entity income streams
What We Handle for Multi-State Clients
Multi-state income tax filings
Sales tax registration and reporting
Nexus analysis and state registration
Payroll compliance for multi-state teams
Real estate and rental income reporting
Residency and domicile planning
Coordinated bookkeeping across all states
Get Started
Whether you’re based in NYC, Long Island, or operating in several states, you need accounting and tax support that stays consistent everywhere your business goes.
We help you stay organized, compliant, and prepared.
Why Businesses Choose Sundack CPA
We keep accounting, tax, and compliance straightforward — even when your business operates in multiple jurisdictions. Clients work with us because:
We prioritize accuracy and consistency
We understand New York’s complexity and how it affects businesses everywhere
We coordinate filings across states without gaps or conflicting advice
We build stable financial systems that scale with your business
We communicate clearly and directly — no vague reporting, no hidden issues
You get one CPA team managing all deadlines, filings, and accounting needs. No guesswork and no juggling multiple firms.
At Sundack CPA, your success is our priority. We’re not just expert CPA's —we’re your financial partners, committed to helping you grow and thrive.
Ready to see the Sundack CPA difference? Connect With Us Now!