USA Guide 2026 : New Hampshire
Ranked Individuals
Provided by Rath, Young & Pignatelli, P.C.
The Tax Practice Group at Rath, Young & Pignatelli approaches each client’s tax matters as if its attorneys were members of the client’s internal tax and finance team. Our goal in every engagement is to understand the client’s business objectives and structure solutions that allow tax laws to support those objectives.
Our tax attorneys advise individuals, closely held businesses and multinational companies on federal, state, and local tax matters, combining technical depth with practical, business-focused judgment. From planning and compliance to audits, disputes, appeals, and litigation, we provide trusted counsel grounded in decades of experience.
Provided by Chambers
Rath, Young & Pignatelli PC fields a highly regarded tax group with impressive capabilities across a range of contentious, advisory and transactional mandates. The firm frequently advises on legislative concerns as part of its broader government relations practice and acts for a broad client base on planning for domestic and cross-border transactions, as well as IRS controversies. It is also highlighted for its strong SALT practice.
Provided by Chambers
William Ardinger is well-regarded for his extensive tax practice, which sees him advise a range of corporate entities on both state and federal concerns. His expertise includes high stakes controversies before New Hampshire authorities and the IRS, as well as advising on cross-border transactions.
William is distinguished by his legislative work; businesses call him when they think they have a tax problem that they think legislature should address.
Kathryn Bibbo advises clients on a wide range of state and local tax matters, including tax‑efficient structuring of business transactions, audit defense and the resolution of tax controversies. She represents clients in administrative and judicial proceedings and provides strategic guidance on compliance and tax obligations.
She is brilliant. I think she is the best SALT lawyer around in New Hampshire.
Kathryn specializes in state tax, and not just in New Hampshire. She is very good because of that.
Head of Tax
Head of Tax
Provided by Rath, Young & Pignatelli, P.C.
William Deitch
Michael Lewis
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