Notchbooks
- Understand
- Financial
- Team
3 of these companies are based in Smithtown; the others serve Smithtown from towns including Melville (12 mi), Hauppauge (3 mi) and Central Islip (6 mi).
5 open weekends · all 24 rated 4.5+
Data verified October 18, 2026
The 24 companies listed for Smithtown, NY run payroll, filings and timekeeping for employers. Service and software details are taken from each provider's own website; ratings and quotes come from public reviews.

The 24 companies on this page are rated from 4.6 to 5.0 across 1,460 reviews; 8 have 50 or more reviews. When clients rate these companies on specific qualities, they most often praise professionalism (100%), responsiveness (91%) and quality (65%). The topics that come up most in reviews of the companies on this page are "knowledge", "communication" and "efficient". 5 are open on Saturdays. The services the companies on this page list most often on their websites are tax services (9), payroll services (6), business services (5), business valuations (3) and bookkeeping (2). 3 have a BBB rating of A or A+. 21 have ten or more years of experience, the longest 59 years. 5 offer payment plans; 5 offer a free initial consultation and 1 lists coupons or special offers. We have a website on file for all 24 of the companies on this page; all 24 publish a contact page; 21 list a public email and 5 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.
An office in Smithtown is held by 3 of the 24 companies. The rest come from other towns within 20 mi. Payroll is run remotely, so the filing jurisdictions a provider covers matter far more than the address. Distances are straight-line.