Kassman Accounting
“Best experience I've ever had when doing my taxes not only is Marshall extremely knowledgeable but he's also incredibly time efficient .”
Best Tax Preparation Services near Islip, NY
We have one company in Islip on file, but only the highest-rated make our list, and it did not make it; the 15 here come from towns including Central Islip (5, 3 mi), East Islip (3, 0 mi) and Smithtown (3, 9 mi).
3 open weekends · 13 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.”
TLN Services
“This place is amazing, the staff here are always on top of there things,I am always satisfied by there work.”
Shelton Tax & Accounting
“I have utilized both Father and Son for my taxes and only hope to be able to lean on Kaitlynn for a home in my near future.”
LOS Tres Ositos
“So professional all the stuff, very knowledgeable and they really have full and respectfully people I've been doing almost 15 years business with them definitely recommended for everyone”
E-Taxman
“Prompt and professional, have been using them for many years!”
The 15 companies listed for Islip, NY prepare and file tax returns for individuals and small businesses. What each says about its services and credentials 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 4.4 to 5.0 across 1,182 reviews; 5 have 50 or more reviews and 13 are rated 4.5 or higher. The topics that come up most in reviews of the companies on this page are "efficient" and "knowledge". 3 are open on Saturdays and 2 on Sundays. The services the companies on this page list most often on their websites are tax services (4), bookkeeping (2), business services (2) and quickbooks services (2). Domain records put 5 websites of the companies on this page at ten or more years old; the oldest dates from 2004. 1 offers payment plans; 3 offer a free initial consultation and 1 lists coupons or special offers. We have a website on file for 11 of the companies on this page; 11 publish a contact page; 8 list a public email and 3 take bookings online. We count these figures across the companies on this page; distances are straight-line, and hours and prices change, so confirm the details with the company before you book a consultation.
Are any tax preparers listed for Islip open on Saturdays or Sundays?
3 of the 15 companies list weekend hours. Extended and weekend opening is common through the filing season and disappears afterward, so the hours shown here may not match what you find in the quiet part of the year. Call before you travel.
Warenik-Serini Tax Services
“Very knowledgeable when it comes to financial issues.”
MAS TAX Services
“I highly recommend Mas Tax Services”
George Fritz Tax Preparation
“He is friendly, very knowledgeable and follows through when he says he will.”
LCH Bookkeeping
Book onlineBook
Notchbooks
“Ian is very knowledgeable and helpful throughout the process.”
Edwin Casanova, CPA
“Edwin and staff are very professional and knowledgable.”
Tait's Tax Service INC
“Nick was very attentive and also took the time to educate me when I had questions..”
SMG ABA
“I have tried to pinch pennies here and there to run a profitable business and have been very successful in those areas but it took me a while to learn that I didn't want to skimp or short change my accounting team as they have saved and helped me make so many multiples of their fees that now you couldn't pay ME to work with a different company- that is how monumental their assistance has been.”
Raisman CPA
“Al Treglia has been our business and family CPA and trusted advisor for over 30 years.”
Why these companies made our list
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