This ranking covers accounting firms in New York, taking in Manhattan boutiques, Long Island practices and firms serving upstate cities such as Syracuse and Rochester. TrustList lists 174 of them, and 35 earned a rank number in the Q4 2026 edition. One ranked firm holds a professional accreditation. Thirty-one state a founding date, from the 1910s to the 2010s. Syracuse is the most common base with four, followed by Jericho and New York with three each, and Rochester and Brooklyn with two.
The order rests on the evidence TrustList held on 5 October 2026: client reviews, vetting, awards and facts each firm states on its own website, which we read and dated. Nobody pays to be placed. Listings with nothing checkable are listed but not ranked, and positions stay fixed until the January 2027 edition. To move up, a firm can add client reviews or verified facts to its free profile.