Insights

Niche Tax Practice Specializes in federal and state tax issues for individuals, estates, and businesses with emphasis on audits, liability disputes, and court resolutions, indicating opportunities to cross-sell complementary tax advisory and representation services to high-risk tax filers and entities facing audits.

Experienced Legal Team Led by two seasoned attorneys with over a century of combined experience in IRS and state tax matters, suggesting potential for premium advisory engagements, reputation-based referrals, and advisory retainers for complex tax dispute portfolios.

Domestic and International Deep capabilities in foreign transaction reporting, FBAR penalties, and cryptocurrency tax issues, presenting near-term sales potential with expatriates, international clients, crypto businesses, and wealth managers seeking compliance and dispute resolution.

Tech-Enabled Reach Utilizes digital tools (WordPress, Google Cloud, Google Maps, Signal) for client access and engagement, offering upsell opportunities for client portals, secure document exchange, and enhanced virtual consultations to broaden geographic reach.

Revenue Growth Signals Current revenue range and target client mix (individuals, estates, and businesses) indicate room to scale with mid-market and high-net-worth clients, as well as strategic partnerships with accounting firms and real estate or corporate law practices.

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 October 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 October 2026, McMahon & Tivnan, PC has approximately 9 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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