Insights

Niche Tax Defense Target firms and individuals facing IRS or state tax disputes who may require expert defense and dispute resolution services, highlighting McMahon & Tivnan’s depth in complex tax matters and court experience.

High Touch Expertise Position the firm as a boutique with seasoned practitioners (over 100 years combined) to win engagements from clients seeking personalized, high-seniority tax strategy and litigation support.

Foreign Tax Focus Leverage specialization in foreign transaction reporting, FBAR, and cryptocurrency tax issues to win clients with cross-border tax exposure, including expatriates and international businesses.

Tech-Enabled Service Highlight use of modern tools (Google Cloud, Google Workspace, WordPress, analytics-ready platforms) to communicate efficiently, manage cases, and provide secure client portals for tax dispute workflows.

SMB and Estate Niche Target individuals, estates, and small businesses with tax issues where a focused firm can offer cost-effective, precise advisory and representation across audits, liability disputes, and collections.

Similar companies to McMahon & Tivnan, PC

McMahon & Tivnan, PC Tech Stack

McMahon & Tivnan, PC uses 8 technology products and services including Signal, WordPress, CookieYes, and more. Explore McMahon & Tivnan, PC's tech stack below.

McMahon & Tivnan, PC's Email Address Formats

McMahon & Tivnan, PC uses at least 1 email format:
McMahon & Tivnan, PC Email FormatsExamplePercentage
First@mcmahontaxlaw.comJohn@mcmahontaxlaw.com
100%

Frequently Asked Questions

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.

How much revenue does McMahon & Tivnan, PC generate?

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As of August 2026, McMahon & Tivnan, PC's annual revenue is estimated to be $1M - $10M.

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 August 2026, McMahon & Tivnan, PC has approximately 8 employees across 1 continents, including North America. Key team members include Associate Attorney: K. W. and Irs Tax Attorney: W. W. 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 Signal, WordPress, CookieYes, Shopify, Google Workspace, Google Cloud, Google Maps and Slider Revolution.

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 logo

McMahon & Tivnan, PC

Law PracticeMassachusetts, United States2-10 Employees

McMahon & Tivnan, PC is a Boston, Massachusetts-based law practice focused on federal and state tax matters. The firm represents individuals, estates, and businesses through audits, liability disputes, and collection efforts, defending IRS and state tax issues and, when necessary, pursuing disputes in court. Led by D. Sean McMahon and Ryan Tivnan, the team combines more than a century of collective experience in investigating and defending tax issues.

They provide insights into the real risks presented by tax disputes and planning for complex transactions across corporate, real estate, partnership, securities, and options contexts. They advise clients on the tax considerations of these arrangements and have extensive experience assisting individuals with foreign transaction reporting and penalty disputes, including FBAR requirements and cryptocurrency transactions.

Section iconCompany Overview

Phone number
NAICS Code
54111 - Offices of Lawyers
Employees
2-10

Section iconFunding & Financials

  • $1M - $10M

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

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