Professional Accounting Firm Longueuil

Office Information

1010, rue de Sérigny Bureau 800 Longueuil, QC, J4K 5G7

Our Longueuil Office

We offer our clients on the South Shore a full suite of accounting, tax, and advisory services to meet their needs in every aspect of their business.

We are always looking for dynamic professionals to join our team. To see the current career opportunities for the Quebec region, please click here. 

The MNP office in Longueuil is located at 1010 de Sérigny street, suite 800, next to the Longueuil bus and metro terminus and the Sandman hotel. There are several paid outdoor parking lots at the hotel or at the terminus. The office is accessible to people with mobility impairment.

MNP’s Longueuil office, together with our Greater Montreal offices, is a proud supporter of some key organizations and events, including:

Services at our Longueuil location

Contact our Longueuil (Longueuil metro) team today

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Regional Managing Partner

Jean-Philippe Langevin, CPA, CFA, CBV, CFF, is the Regional Managing Partner for the Greater Montreal region. He provides strategic direction for the Montreal, Laval and Longueuil offices and leads the team of over 400 professionals providing services to clients. 

A partner at MNP for over 10 years, Jean-Philippe is also a member of the Valuations & Litigation Support team. Results-oriented, Jean-Philippe gains a thorough understanding of each client’s needs in order to deliver an optimal solution in a timely manner.  His clients include litigation lawyers requiring assistance in areas such as commercial litigation, damage quantification and family law, and tax lawyers requiring valuation advice in corporate reorganizations and non-arm’s length transactions. He advises buyers and sellers, helping them accurately determine the value of businesses before a potential transaction. He also works with corporate management teams on valuations for financial reporting and internal planning purposes.

Building from his distinguished academic achievements while at McGill University, Jean-Philippe has prepared expert reports for court proceedings addressing damage quantifications and is recognized as an expert in business valuation by the Québec Superior Court, Ontario Supreme Court of Justice and the Administrative Tribunal of Québec. Designated a Chartered Business Valuator (CBV) in 2010, he is also a Chartered Professional Accountant (CPA), a Chartered Financial Analyst (CFA) and is accredited by the American Institute of Certified Public Accountants in Financial Forensics (CFF).



  • Performance

    July 10, 2023

    New Québec tax measures announced - including harmonization with recent federal tax changes

    Read MNP’s summary of the adjustments to the Québec tax system announced on June 27, 2023.

  • Performance

    March 28, 2023

    2023 Federal Budget Highlights

    Deputy Prime Minister and Minister of Finance the Hon. Chrystia Freeland tabled the Federal Government’s budget on March 28, 2023.

  • Performance

    March 21, 2023

    2023 Québec Budget Highlights

    View a summary of MNP’s highlights from the 2023 Québec Budget.