Insights

Niche Tax Focus Target businesses and individuals with complex tax issues, including audits, liability disputes, and foreign transaction reporting, as ongoing inbound opportunities for high-margin advisory and representation services.

Experience Advantage Leverage the combined century of tax dispute experience to position as an authority for clients seeking trusted defense in IRS and state tax matters, offering premium service led by seasoned partners.

Technology Use Explore partnerships or white-label tools that enhance client intake, document management, and engagement workflows, aligning with the firm’s current tech stack to streamline service delivery.

SMB and Real Estate Niche Capitalize on advisory needs in corporate, real estate, partnerships, and securities transactions for small to mid-market entities that require tax planning and transaction structuring guidance.

Strategic Growth Present growth opportunities through referral programs with accounting firms and financial advisors, cross-sell on penalty disputes and FBAR/foreign transaction services to expand client reach.

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
  • Lodash
    Javascript Libraries
  • Moment.js
    Javascript Libraries
  • Google Maps
    Maps
  • PHP
    Programming Languages

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

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 July 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 July 2026, McMahon & Tivnan, PC has approximately 9 employees across 1 continents, including North America. Key team members include Associate Attorney: K. W.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 SignalSmart Slider 3Font AwesomeModernizrLodashMoment.jsGoogle MapsPHP.

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

Section iconFunding & Financials

  • $1M - $10M

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

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