Kassman Accounting
“Quick, excellent, convenient, Michael gave me great advice, he's great, just like his father.”
Best Bookkeeping Services near Islip, NY
These companies serve Islip from nearby bases in towns including Central Islip, Smithtown and East Islip.
15 companies listed · 5 open weekends · 11 rated 4.5+ · 1 shows a license
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
“As a client for more than 10 years, the Shelton's have dedicated time and resources to advise my financial and tax situations from mortgages and taxes to retirement plans.”
LCH Bookkeeping
Book onlineBook
Notchbooks
“Working with Ian and his team was great - this was the first year I used an accountant , but it was long overdue as Notchbooks made tax season really simple .”
SMG ABA
“Responsive, for me, is so important along w all the other expectations”
The 15 companies listed for Islip, NY keep books, reconcile accounts and close the month for businesses. What each says about its packages and software comes from its own website; ratings and quotes come from public reviews.
Area overview: Islip, NY
14 of the 15 companies on this page have a rating, from 4.0 to 5.0 across 1,186 reviews; 6 have 50 or more reviews and 11 are rated 4.5 or higher. The topics that come up most in reviews of the companies on this page are "knowledge" and "efficient". 5 are open on Saturdays and 1 on Sundays. The services the companies on this page list most often on their websites are tax services (6), business services (4), quickbooks services (3), services for individuals (3) and small business accounting (3). 1 shows a license on its website and 2 have a BBB rating of A or A+. Domain records put 7 websites of the companies on this page at ten or more years old; the oldest dates from 2004. 3 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 companies 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 companies on this page; hours and prices change, so confirm the details with the company before you book a consultation.
Can I request help online from bookkeepers listed for Islip?
3 of the 15 companies take inquiries or appointment requests through their own website. A company without that option works by phone or email. Whichever you use, say what software you run and roughly how many transactions a month you have. It is what decides the price.
Lindenhurst CPA
“He answered any questions I had and responded almost immediately.”
Raisman CPA
“We have been coming to Raisman CPA & Associates for generations and trust them like family.”
Castaldo CPA
“They are also very easy to work with, especially being that I am a small business owner.”
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
“Glenn is an absolute professional and has tremendous knowledge of the business.”
Bookwise Business Solutions
“Their dedicated team of experts handles everything from monthly financial statements to tax preparation, making them ideal for companies seeking hands-off accounting solutions.”
Rost & Company, Cpas
“Professional, proficient, and detailed through out the entire process”
Sebastiano Vitelli & Co Accountants & Consultants
“Been using him for 30 years and would never go anywhere else.”
Weisman & Co., Cpa's
“Lanny and Chris Weisman have been our business and personal accountants for over 20 years.”
Why these companies made our list
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