Kassman Accounting
“Marshall Kassman does an awesome job, super efficient & quick, he makes doing taxes super easy & stress-free for me, super thankful for them!”
Best Accountants near Islip, NY
We have one firm in Islip on file, and it is on this list, along with 14 from towns including Bay Shore (2, 3 mi), Central Islip (2, 3 mi) and Smithtown (2, 9 mi).
7 open weekends · 14 rated 4.5+
Data verified October 27, 2026
King and Associates, CPA
“Quality quick service would recommend them to any of my family members or business associates.”
Don Coley & Associates
James P Phelan CPA
“Everyone here is friendly and they care about serving their customers.”
Book onlineBook
Notchbooks
“He takes the time to answer questions and provides suggestions for the next following year.”
Lindenhurst CPA
“Highly professional, helpful in the process and was very quick about doing my taxes.”
The 15 firms listed for Islip, NY prepare accounts, statements and returns for businesses and individuals. What each says about its services and software comes from its own website; ratings and quotes come from public reviews.
Area overview: Islip, NY
The 15 firms on this page are rated from 4.0 to 5.0 across 940 reviews; 8 have 50 or more reviews and 14 are rated 4.5 or higher. When clients rate these firms on specific qualities, they most often praise professionalism (97%), responsiveness (83%) and value (83%). The topics that come up most in reviews of the firms on this page are "efficient", "knowledge" and "communication". 7 are open on Saturdays and 1 on Sundays. The services the firms on this page list most often on their websites are tax services (6), small business accounting (4), quickbooks services (3), business services (2) and business valuations (2). 1 has a BBB rating of A or A+. 11 have ten or more years of experience, the longest 22 years. 2 offer payment plans; 6 offer a free initial consultation and 1 lists coupons or special offers. We have a website on file for all 15 of the firms on this page; all 15 publish a contact page; 13 list a public email and 5 take bookings online. We count these figures across the firms on this page; distances are straight-line, and hours and prices change, so confirm the details with the firm before you book a consultation.
Which accounting firms listed for Islip describe their services online?
All 15 firms on this page have a website on file. Most list the industries they serve and the bookkeeping software they support, which is the fastest way to find a fit. Everything there is the firm's own description of itself.
Edwin Casanova, CPA
“I'm very satisfied with how my taxes preparation was handled you guys are awesome”
Ross & Company, CPA
“Glen Ross is thoroughly informed, conscientious, careful, and responds quickly to inquiries -- an ideal accountant in every respect.”
SMG ABA
“Their knowledge of the of tax code has help us navigate PTET, QBI and PPP with ease.”
James Castaldo CPA & Associates
“James Castaldo has been my accountant for over a year and has taken care of all my tax and accounting needs from my business to my personal and ever my family taxes.”
Tait's Tax Service INC
“Taits was truly professional from start to finish - excellent communication and answered any and all questions I had quickly, will definitely file again with them in the future!”
Sacco Tax Accounting
“Always professional and very attentive to making sure he gets you back the most you are entitled to.”
Fine & Clear Tax Solutions
“It's been a pleasure working with you thank you very much for your services.”
Ambrosio & Bellotti, Cpas
“I have been using Ambrosio and Bellotti for as long as I can remember and I can't say enough good things about them!”
Thomas Brown CPA
“I am thoroughly impressed with the quality of the service of this firm.”
Why these companies made our list
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