Insights

Specialized Tax Expertise McMahon & Tivnan, PC demonstrates deep expertise in complex federal and state tax disputes, presenting opportunities to offer specialized tax advisory services or advanced dispute resolution tools to enhance their capabilities.

Technology Adoption The firm's utilization of modern web and development technologies indicates openness to innovative solutions; prospects can explore offering legal tech platforms, case management software, or client engagement tools tailored for small legal practices.

Growth Potential With reported revenues between 1M and 10M and a small team, McMahon & Tivnan presents a potential market for scalable services like cloud-based case management, marketing automation, or professional development platforms to support business expansion.

International Focus Their experience with foreign transaction reporting and international banking suggests opportunities to provide multilingual support, international compliance software, or global client outreach solutions to enhance their service offerings.

Market Differentiation Positioned within a niche legal sector, the firm could benefit from marketing solutions that highlight their specialized expertise, such as targeted digital advertising or thought leadership content, attracting high-net-worth individuals and complex business clients.

McMahon & Tivnan, PC Tech Stack

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

  • Signal
    Communications Technology
  • Smart Slider 3
    Design
  • Google Fonts API
    Font Scripts
  • imagesLoaded
    Javascript Libraries
  • jQuery
    Javascript Libraries
  • Modernizr
    Javascript Libraries
  • Google Maps
    Maps
  • 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?

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

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

Minus sign iconPlus sign icon
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?

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

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

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

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

Minus sign iconPlus sign icon
As of May 2026, McMahon & Tivnan, PC has approximately 9 employees across 1 continents, including North America. Key team members include Partner: S. M.Partner: R. T.Tax Attorney: A. M.. Explore McMahon & Tivnan, PC's employee directory with LeadIQ.

What industry does McMahon & Tivnan, PC belong to?

Minus sign iconPlus sign icon
McMahon & Tivnan, PC operates in the Law Practice industry.

What technology does McMahon & Tivnan, PC use?

Minus sign iconPlus sign icon
McMahon & Tivnan, PC's tech stack includes SignalSmart Slider 3Google Fonts APIimagesLoadedjQueryModernizrGoogle MapsPHP.

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

Minus sign iconPlus sign icon
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 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

Ready to create more pipeline?

Get a demo and discover why thousands of SDR and Sales teams trust
LeadIQ to help them build pipeline confidently.

ยฉ LeadIQ, Inc. All rights reserved.