Business Tax Preparation & Planning for Long Island Small Businesses

Get expert business tax preparation in Suffolk County with a local CPA team that understands Long Island—Port Jefferson Station, St. James, Smithtown, Setauket, Nesconset, Mount Sinai, and Lake Grove. From small business tax filing in NY to year-round strategy, we prepare accurate returns and help you plan ahead—so your corporate tax returns with a CPA on Long Island support cash flow and growth.

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File Accurately, On Time—And Keep Business Moving

We handle entity-specific filings and the details that matter—so you can focus on operations. Expect organized requests, clear timelines, and returns that reflect every eligible business deduction within IRS and New York rules.

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What We Prepare for Your Business

We prepare and e-file federal and NYS business returns across entities:

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S-Corporations (1120S):

Officer comp, shareholder basis, K-1s

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C-Corporations (1120):

Book-to-tax adjustments, NOLs, credits

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Partnerships/LLCs (1065):

Partnership allocations, capital accounts, K-1s

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Sole Proprietors (Schedule C):

Clean categorization and substantiation

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Sales & Use Tax:

NYS returns and nexus guidance

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Payroll Tax Filings:

941/940, NYS Withholding, and annual reconciliations

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Extensions & Estimates:

Strategy to avoid penalties and surprises

Tax Planning That Supports Profit

Smart planning reduces friction at year-end. We align entity choice with your goals, time purchases and deductions, and model outcomes before you commit—so your numbers work in both Port Jefferson Station and the boardroom.


We coordinate owner compensation, pass-through income, and estimated taxes to avoid personal return shocks. For S-Corp tax prep in Port Jefferson and LLC tax return help in NY, we translate rules into action items your team can follow.

Year-Round Strategy, Not Just a March Fire Drill

We check in through the year to adjust estimates, plan asset purchases, and capture credits/incentives relevant to your industry (contractors, retailers, professional services, nonprofits). If notices arrive from the IRS or NYS, you won’t go it alone—our team helps respond, and when needed we connect you to our Tax Resolution Services for representation.

Local Expertise for Long Island Businesses

From St. James storefronts to service companies across Suffolk County, we understand regional concerns—seasonality, staffing, quarterlies, and sales tax nuances. You’ll get clear requests, proactive reminders, and returns delivered with a short “act on this next” list. The goal: fewer surprises, stronger margins, and more time to run your business.