Kassman Accounting
“Marshal is my personal accountant, and he is always keeping it real & helping me to optimize my returns!”
Best QuickBooks Consulting & Training near Islip, NY
There are no firms listed in Islip itself yet; the 15 below are the closest options, from towns including Smithtown (3, 9 mi), Central Islip (2, 3 mi) and Melville (2, 12 mi).
1 open 24/7 · 7 open weekends · 13 rated 4.5+
Data verified October 21, 2026
King and Associates, CPA
“Quality quick service would recommend them to any of my family members or business associates.”
Shelton Tax & Accounting
“Great tax prep service , been going for years .”
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Notchbooks
“Notchbooks has been a great resource as I navigate complex tax returns.”
Edwin Casanova, CPA
“I know we are in good hands with them, and that is why we come back every year.”
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Michael Verderosa CPA P.C
“Not only is he pleasant to talk to but his replies to any questions or concerns are speedy and detailed.”
The 15 firms listed for Islip, NY set up, repair and teach accounting software for businesses. What each says about certifications and supported platforms 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 1,416 reviews; 8 have 50 or more reviews and 13 are rated 4.5 or higher. The topics that come up most in reviews of the firms on this page are "knowledge", "communication" and "efficient". 1 is open around the clock; 7 are open on Saturdays and 2 on Sundays. The services the firms on this page list most often on their websites are tax services (6), bookkeeping (3), business services (3), quickbooks services (3) and small business accounting (3). 1 has a BBB rating of A or A+. Domain records put 7 websites of the firms on this page at ten or more years old; the oldest dates from 2004. 1 offers urgent consultations; 2 offer payment plans; 5 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; 11 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.
Do any consultants listed for Islip offer a free file review?
5 of the 15 firms state that a first consultation costs nothing. For software work that normally means a short call about what you run and what is broken, not access to your file. A genuine diagnostic takes hours and is usually billed.
SMG ABA
“SMG ABA LLC for a few years now, They have really separated themselves with the level of service and expertise that I haven't found with any other CPA Accounting firm before.”
Lindenhurst CPA
“I had issues with my previous taxes and he was able to consolidate and rectify the previous errors.”
Raisman CPA
“Have had the pleasure and privilege of working with Raisman CPA since the late 1970's directly with Myron Raisman and after he retired, with Connie Ryan; and have been with them ever since.....”
Castaldo CPA
“Not only did they get my returns completed In a very timely manner, they looked over my books in Quickbooks and made all necessary changes for going forward.”
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!”
Ross & Company, CPA
“In addition to being my most trusted CPA I also consider him a super sound and very relatable advisor and friend and I sleep super sound at night knowing that I've got him in my proverbial pocket.”
Bookwise Business Solutions
“The staff and Managment is very knowledgeable and friendly.”
Anne Napolitano Consulting
“Coupled with her expertise is also an incredibly caring and hands-on attitude that simply cannot be taught.”
John E Helldorfer, CPA
“He is extremely organized, efficient and responsive.”
Why these companies made our list
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