King and Associates, CPA
“Quality quick service would recommend them to any of my family members or business associates.”
Best CPAs near Islip, NY
These firms serve Islip from nearby bases in towns including Hauppauge, Smithtown and Central Islip.
15 firms listed · 3 open weekends · 12 rated 4.5+
Data verified October 27, 2026
Edwin Casanova, CPA
“Had our return done and ready timely and answered all our questions and then some!”
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Michael Verderosa CPA P.C
“Mike has been doing our taxes for the last 2 years and has done and outstanding job at a very reasonable cost my only regret is that I did not find him sooner”
SMG ABA
“Each partner is always accessible, and prepared to explain various tax situations in as much detail as you can consume; no ask is too big or too small.”
Lindenhurst CPA
“I was able to get my taxes done expeditiously and for a great price.”
Raisman CPA
“My account, Connie Ryan, is there for me at a moments notice.”
The 15 firms listed for Islip, NY are accounting practices that serve businesses and organizations. What each states about its CPA license and assurance work 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 763 reviews; 6 have 50 or more reviews and 12 are rated 4.5 or higher. The topics that come up most in reviews of the firms on this page are "communication", "efficient" and "patient". 3 are open on Saturdays. The services the firms on this page list most often on their websites are tax services (6), financial planning (4), business services (3), business valuations (3) and services for individuals (3). 3 have a BBB rating of A or A+. 10 have ten or more years of experience, the longest 33 years. 2 offer payment plans and 6 offer a free initial consultation. We have a website on file for all 15 of the firms on this page; all 15 publish a contact page; 12 list a public email and 3 take bookings online. We count these figures across the firms on this page; hours and prices change, so confirm the details with the firm before you book a consultation.
Which CPA firms listed for Islip list their assurance services?
Website details are held for all 15 firms on this page. Most name the engagement types they perform and the industries they serve, which is the quickest way to see whether audit work is core business or an occasional job for them.
Cerini & Associates
“It is my pleasure to post publicly about how absolutely fantastic working with Ed McWilliams @ Cerini has been for me, my firm and many of the clients we share.”
Castaldo CPA
“James Castaldo and his associates helped my husband significantly reduce his back tax debt amongst other things!”
Thomas Brown CPA
“Tom did our taxes for the first time this year and we are very pleased.”
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!”
United Financial Planning Group
“Gerry and Petr took the time to understand my situation and not only prepare my taxes but prepare me for the following year when my job situation was changing.”
Ross & Company, CPA
“The whole tax process can be very confusing and complicated, but Glen has helped make it easy for us to deal with.”
Rost & Company, Cpas
“This firm is extremely knowledgeable and efficient.”
William Carpenter CPA
“He has helped streamline my costs and has helped me prevent paying any payroll tax penalties by providing a great payroll service that is affordable.”
Sales Tax Defense
“I have referred them numerous times and always received very happy notes from grateful clients.”
Why these companies made our list
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