Atty. Kathryn Bibbo

Atty. Kathryn Bibbo

Kathryn is a shareholder of the firm and a member of the firm’s Tax Practice Group, where she concentrates her practice in assisting clients with state and local tax matters. Kathryn’s practice focuses on matters before the New Hampshire Department of Revenue Administration, the Massachusetts Department of Revenue, and the Vermont Department of Taxes.

Call (603) 226-2600 Book Appointment

Profile Summary

About Kathryn Bibbo at a glance

Kathryn Bibbo is a tax and tax litigation attorney based in Concord, New Hampshire, practicing at Rath Young Pignatelli PC. Admitted to practice in Illinois, Illinois Bar Association, New Hampshire, New Hampshire Bar Association, Massachusetts, Massachusetts Bar Association, and Vermont, Vermont Bar Association. Educated at DePaul University (J.D., 1996). Recognitions include Lawyer of the Year — Tax Law (Concord) (2026), Best Lawyers in America — Litigation and Controversy - Tax (2026), and Best Lawyers in America — Tax Law (2026). Serands clients in Concord, NH and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

Kathryn is a shareholder of the firm and a member of the firm’s Tax Practice Group, where she concentrates her practice in assisting clients with state and local tax matters. Kathryn’s practice focuses on matters before the New Hampshire Department of Revenue Administration, the Massachusetts Department of Revenue, and the Vermont Department of Taxes.

Prior to joining the firm in 2007, she was with the state and local tax practice of PricewaterhouseCoopers, LLP in its Chicago office. She specialized in income/franchise tax consulting and audit defense for multistate and multinational businesses. Prior to then, Kathryn served as Special Assistant Attorney General for the Income Tax Litigation Unit of the Illinois Department of Revenue.

Kathryn has represented clients on numerous state and local tax matters in the New England states, including but not limited to:

  • planning business structures and transactions in a tax-efficient manner;
  • adult defense of tax controversies at the pre-assessment and post-assessment phases, including successful negotiation and settlement;
  • litigation of tax controversies in tax administrative proceedings and in appeals to state court;
  • representation of clients in state voluntary disclosures, including the Multistate Tax Commission's National Nexus Program; and
  • resolution of tax controversy matters through coordination with the firm's government relations team in the legislature.

In 2017, Kathryn was selected to be included in Best Lawyers in America in the area of tax law. Kathryn is a regular speaker and author on state tax topics in New England, including but not limited to:

  • combined unitary reporting;
  • nexus;
  • apportionment;
  • sales and use tax;
  • pass-through entities; and
  • federal conformity issues.

Kathryn is presently on the Board of Trustees for the New England State and Local Tax Forum, a member of the Vermont Tax Advisory Board appointed by the Commissioner of Taxes to represent business interests, and serves as co-contributor for the New Hampshire and Vermont state tax developments for Council on State Taxation (COST) in Washington, D.C.

Practice Areas Explained

Kathryn Bibbo's Areas of Practice

Each practice area below reflects the types of cases Kathryn Bibbo handles, with a brief overview of what that area of law covers.

Tax Law

Tax attorneys handle IRS audits, tax debt, international tax, estate planning, and tax court litigation.

Kathryn Bibbo is one of 85,302 tax attorneys indexed nationally. Browse tax attorneys in New Hampshire →

Tax Litigation

Kathryn Bibbo is one of 3,110 tax litigation attorneys indexed nationally. Browse tax litigation attorneys in New Hampshire →

Jurisdictional Context

Why local counsel matters in New Hampshire

Practicing law in New Hampshire. Legal matters in New Hampshire are governed by state-specific rules of civil and criminal procedure, statutes of limitations, and substantive law. Cases originating in Concord are typically filed in the local municipal court or the appropriate New Hampshire state district court, depending on subject matter and amount in controversy. An attorney licensed in New Hampshire brings working knowledge of local procedural deadlines, judicial practices in this andnue, and the substantive law that applies to cases brought here. Out-of-state attorneys generally cannot represent clients in New Hampshire courts without local counsel or pro hac vice admission.

Looking for additional New Hampshire attorneys? Browse all attorneys in Concord or all attorneys in New Hampshire.

Frequently Asked

Common questions about Kathryn Bibbo

Where is Kathryn Bibbo's law office located?
Kathryn Bibbo's law practice is located in Concord, New Hampshire. The firm is Rath Young Pignatelli PC. You can contact the office directly through this profile page.
What practice areas does Kathryn Bibbo handle?
Kathryn Bibbo focuses on tax, tax litigation. Each practice area listed reflects experience handling cases of that type in New Hampshire.
Where did Kathryn Bibbo go to law school?
Kathryn Bibbo earned their education at (J.D., 1996).
How can I contact Kathryn Bibbo for a consultation?
You can contact Kathryn Bibbo directly through this profile page. Click "Ask the Attorney" to submit a question, or "Schedule a Consultation" to book a meeting. Most claimed-profile attorneys respond within one business day.
What awards or recognition has Kathryn Bibbo received?
Kathryn Bibbo's notable recognition includes: Lawyer of the Year — Tax Law (Concord); Best Lawyers in America — Litigation and Controversy - Tax; Best Lawyers in America — Tax Law; Best Lawyers in America — Awards:; Best Lawyers in America — Included in Best Lawyers in America 2017.

Education

J.D.
DePaul University
- 1996

Awards

Lawyer of the Year — Tax Law (Concord)
- 2026
Best Lawyers in America — Litigation and Controversy - Tax
- 2026
Best Lawyers in America — Tax Law
- 2026
Best Lawyers in America — Awards:
- 2026
Best Lawyers in America — Included in Best Lawyers in America 2017
- 2026
Lawyer of the Year — Litigation and Controversy - Tax (Concord)
- 2023
Lawyer of the Year — Tax Law (Concord)
- 2023
Lawyer of the Year — Tax Law (Concord)
- 2020

Bar Admissions

Illinois, Illinois Bar Association
New Hampshire, New Hampshire Bar Association
Massachusetts, Massachusetts Bar Association
Vermont, Vermont Bar Association

Reviews

These reviews belong to platform users; they do not constitute advertisement or promotion for the attorney. Opinions are published for informational purposes only.

No reviews yet.