Tony Mastin

Of Counsel

Bio Menu
  • Overview
  • Experience
  • Honors & Involvement
Bio overview

Widely considered a leading authority on tax policy and state and local tax issues, Tony Mastin focuses his practice on advising individuals, high net worth families, tax-exempt organizations, and businesses of all sizes on planning matters involving state and local taxation (SALT), including sales and use taxes, multi-state taxation, SALT controversy work, and federal income taxation. He is a member of the Council on State Taxation (COST) and the Independent SALT Alliance (ISA).

A portion of his practice is also devoted to assisting developers, investors and businesses in obtaining and maximizing the use of business incentives, including tax exemptions and tax credits.

Tony’s achievements have earned him inclusion in The Best Lawyers in America (tax law).

Tony joined McAfee & Taft in 2019 following his retirement from the Oklahoma Tax Commission after 35 years of service, including 12 years in which he served as its executive director. Over the course of his illustrious career at the OTC, he also served as an attorney in the General Counsel’s office, deputy director of the Motor Vehicle Division, deputy director of the Business Tax Division, and director of the Tax Policy and Research Division. As executive director from 2007 – 2019, he was responsible for managing the day-to-day operations of the agency, serving as its legislative liaison, and assisting in the proposal, drafting, review and analysis of tax legislation.

Tony’s approachable style, thoughtful manner, and keen understanding of complex technical business and tax issues have earned him a reputation as a consummate professional with a practical approach to problem solving.

On the national level, Tony played an active role in the Streamlined Sales Tax Project (SSTP), a nationwide effort by state and local governments and the private sector to simplify and modernize sales and use tax collection and administration. That effort led to the development and implementation of the Streamlined Sales and Use Tax Agreement. Upon initiation of the SSTP in 2000, Tony served as the Oklahoma delegate for the project’s State and Local Advisory Council (SLAC) and was a member of its steering committee, served as scribe on the original drafting committee, and was also a member of the Compliance Review and Interpretations Committee and the Issue Resolution Committee.

In 2017, The Federation of Tax Administrators honored Tony with the Harley T. Duncan Award for his sustained and significant service to state tax administrators.

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Experience, Honors, & Awards
  • Represented Florida-based USA Rare Earth LLC in negotiating and obtaining multiple state and local economic development incentives, including tax increment financing, used in the acquisition and development of the nation’s very first rare earth metal and sintered neo-magnet manufacturing facility, located in Stillwater, Oklahoma.
  • Represents clients before the Oklahoma Tax Commission on tax issues, including refund claims for overpayment of sales and use taxes, protests on sales and use tax controversies, registering and applying for sales and use tax exemptions, and dealing with five-year ad valorem tax exemption issues.
  • Advises clients on tax incentives, such as sales and ad valorem tax exemptions, investment income tax credits, and Quality Jobs Program incentive payments.  Clients include hospitals, construction contractors, manufacturing facilities, oil and gas companies, wind and solar farms, and data/technology center projects.
  • Advised Fortune 10 client located in large industrial park on application of sales tax exemptions and business structures to avail themselves of ad valorem tax incentives involving five-year tax exemption, sale/leaseback agreement, tax increment financing (TIF), and tax incentive districts.

Honors & Awards

  • Selected by peers for inclusion in The Best Lawyers in America (tax law)
  • Honored with the Federation of Tax Administrators’ Harley T. Duncan Award for Leadership (2017)

Professional Organizations and Memberships

  • Oklahoma Bar Association
  • Council on State Taxation (COST)
  • Independent SALT Alliance
  • Federation of Tax Administrators

ATPs display in this column

At The Podium

State and Local Tax Update

2022 Corporate Counsel Seminar
Oklahoma City, OK | December 8, 2022

State and Local Tax Update

2022 Corporate Counsel Seminar
Tulsa, OK | December 7, 2022

Oklahoma Tax Update

OSCPA's 2022 Oklahoma Tax Institute
Norman, OK | December 2, 2022

Oklahoma Tax and Legislative Update

OSCPA - Oklahoma City Chapter Fall Seminar
Oklahoma City, OK | September 22, 2022

Oklahoma State Update

TXCPA CPE Summit 2022
Irving, TX | August 23, 2022

2021 Tax Update and Tax Challenges for Employers with Remote Employees

2021 Corporate Counsel Seminar
Oklahoma City, OK | December 2, 2021

2021 Tax Update and Tax Challenges for Employers with Remote Employees

2021 Corporate Counsel Seminar
Tulsa, OK | December 1, 2021

Oklahoma Tax Update

Oklahoma Tax Institute
Norman, OK | December 3, 2020

Oklahoma Tax Update

Small Firms Summit
Oklahoma City, OK | October 23, 2020

Sales and Use Taxes in Oklahoma: What taxes nonprofits need to be charging and paying

Oklahoma Association of Community Action Agencies' 2020 Spring Conference
Oklahoma City, OK | March 5, 2020

Revenues and Resources – Financing State Government and Creating a Budget

OCU Leadership & Public Administration Legislative Certificate Program
Oklahoma City, OK | February 8, 2020

Hot and Emerging State and Local Tax Issues

2019 Corporate Counsel Seminar
Oklahoma City, OK | December 5, 2019

Hot and Emerging State and Local Tax Issues

2019 Corporate Counsel Seminar
Tulsa, OK | December 4, 2019

Industry Groups



  • Oklahoma, 1987


  • J.D., Oklahoma City University, 1986
  • B.A. (Criminal Justice), Central State University, 1983