Insights

Specialized Tax Expertise McMahon & Tivnan, PC's focus on complex federal and state tax disputes, including foreign transaction reporting and cryptocurrency issues, presents opportunities to offer tailored legal solutions or enhanced compliance technologies to streamline dispute resolution processes.

Boutique Firm Scale With a small team of 2-10 employees and revenues between 1 million and 10 million dollars, the firm may benefit from scalable legal management software or cloud-based financial tools aimed at enhancing operational efficiency and client management.

Digital Presence & Tech Use The firm's adoption of various digital tools such as Signal, jQuery, and PHP indicates a reliance on technology; sales opportunities exist in providing advanced cybersecurity solutions, client communication platforms, or website optimization services to improve service delivery.

Growth & Revenue Potential Operating in a competitive legal landscape with similar firms, there is potential to expand through marketing automation, lead generation services, or targeted outreach strategies to attract more clients seeking specialized tax dispute resolution.

Market Segments & Client Base McMahon & Tivnan's client base likely includes high-net-worth individuals, estates, and businesses involved in international and complex transactions; tailored financial planning tools, foreign account reporting software, or legal tech solutions could enhance client service offerings.

McMahon & Tivnan, PC Tech Stack

McMahon & Tivnan, PC uses 8 technology products and services including Signal, Smart Slider 3, Font Awesome, and more. Explore McMahon & Tivnan, PC's tech stack below.

  • Signal
    Communications Technology
  • Smart Slider 3
    Design
  • Font Awesome
    Font Scripts
  • Modernizr
    Javascript Libraries
  • Moment.js
    Javascript Libraries
  • imagesLoaded
    Javascript Libraries
  • jQuery
    Javascript Libraries
  • PHP
    Programming Languages

Media & News

McMahon & Tivnan, PC's Email Address Formats

McMahon & Tivnan, PC uses at least 2 format(s):
McMahon & Tivnan, PC Email FormatsExamplePercentage
First@mcmahontaxlaw.comJohn@mcmahontaxlaw.com
100%

Frequently Asked Questions

Where is McMahon & Tivnan, PC's headquarters located?

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McMahon & Tivnan, PC's main headquarters is located at 100 High Street Suite 2601 Boston, Massachusetts 02110 United States. The company has employees across 1 continents, including North America.

What is McMahon & Tivnan, PC's phone number?

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You can contact McMahon & Tivnan, PC's main corporate office by phone at . For more prospecting data, LeadIQ has access to up-to-date and accurate contact information within our platform. Find, capture, and sync contact data to your CRM and sales tools in one click.

What is McMahon & Tivnan, PC's official website and social media links?

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McMahon & Tivnan, PC's official website is mcmahontivnantaxlaw.com and has social profiles on LinkedIn.

What is McMahon & Tivnan, PC's NAICS code?

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McMahon & Tivnan, PC's NAICS code is 54111 - Offices of Lawyers.

How many employees does McMahon & Tivnan, PC have currently?

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As of February 2026, McMahon & Tivnan, PC has approximately 8 employees across 1 continents, including North America. Key team members include Partner: S. M.Partner: R. T.Cpa, Mst: G. O.. Explore McMahon & Tivnan, PC's employee directory with LeadIQ.

What industry does McMahon & Tivnan, PC belong to?

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McMahon & Tivnan, PC operates in the Law Practice industry.

What technology does McMahon & Tivnan, PC use?

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McMahon & Tivnan, PC's tech stack includes SignalSmart Slider 3Font AwesomeModernizrMoment.jsimagesLoadedjQueryPHP.

What is McMahon & Tivnan, PC's email format?

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McMahon & Tivnan, PC's email format typically follows the pattern of First@mcmahontaxlaw.com. Find more McMahon & Tivnan, PC email formats with LeadIQ.

McMahon & Tivnan, PC

Law PracticeMassachusetts, United States2-10 Employees

McMahon & Tivnan, PC represents individuals, estates and businesses with federal and state tax issues from audit through collection. It is led by D. Sean McMahon and Ryan Tivnan.

The firm defends IRS and state tax matters and excels at resolving difficult and complex tax disputes. We counsel clients through examinations and liability disputes and, when necessary, take disputed issues to court. Collectively, our Boston tax attorneys have more than 100 years of experience investigating and defending IRS and state tax matters.

McMahon & Tivnan offer clients unique insights on the real risks presented in disputes with the IRS and planning for complex transactions. They advise clients on the tax considerations of corporate, real estate, partnership, securities and option transactions. The firm also has extensive experience assisting individuals with foreign transaction reporting and penalty disputes, including foreign bank accounts and FBAR requirements, and cryptocurrency transactions.

Section iconCompany Overview

Headquarters
100 High Street Suite 2601 Boston, Massachusetts 02110 United States
Phone number
NAICS Code
54111 - Offices of Lawyers
Employees
2-10

Section iconMedia & News

Section iconFunding & Financials

  • $1M$10M

    McMahon & Tivnan, PC's revenue is estimated to be in the range of $1M$10M

Section iconFunding & Financials

  • $1M$10M

    McMahon & Tivnan, PC's revenue is estimated to be in the range of $1M$10M

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