The Firm

We are a professional corporation specializing in all areas of small business bookkeeping, accounting and income tax services.

Our area of expertise lies specifically in full bookkeeping and payroll services, which gives our customers sound financial advice, tailored to their specific needs for each type of business. We offer professional and courteous bookkeeping technicians that specialize in Sage 50, QuickBooks and Waveapps software among others.


Alain mainville (Bilingual)


A graduate of St-Lawrence College, Alain has worked in various industries developing his skills and knowledge in the bookkeeping, accounting and taxation fields for over 30 years. He established himself independently in 1998 as Alain Mainville Accounting Services, choosing to help small businesses grow and succeed. Incorporated in 2010, Alain has made the commitment to serve his clients in Eastern Ontario, producing quality work while ensuring ethical standards and accuracy.

Along with his memberships in the Intuit ProAdvisor program, Institute of Professional Bookkeepers of Canada, Sage Accountants Network, Alain keeps up-to-date on current accounting practices and Income Tax laws.

Email Alain at alain.mainville@mainvilleassociates.ca



Lyse Longtin (Bilingual)


Lyse Longtin joined the Mainville & Associates/Associés Inc. team in 2012, bringing with her more than 17 years of experience as a bookkeeper for small businesses and non-profit organizations. Her exposure to retail, wholesale and international business provided her with great experience in many aspects of business leadership.

Lyse has been involved in different organizations. She was project manager for the creation of a directory for the 200 members of an association. She successfully initiated a partnership between two associations that allowed the creation of a book to help dyslexic children in schools. Lyse is a dedicated professional who does not hesitate to volunteer and support various non-profit organizations.

Email Lyse at lyse.longtin@mainvilleassociates.ca





Client Says
" Alain has been serving our company since 2001 as an accountant/bookkeeper in the company's accounting department. His expert and professional advice has been extremely valuable to our company. He is very dependable and works well under pressure. Tax season can be quite a demanding time but Alain has proven over the years how well he works under these conditions. Alain is a very proud family man; he is involved in his community, friendly and highly respected by everyone. We strongly recommend Alain without hesitation. He will be an enormous asset to any business.
Gerry, Mike & Dan,
Directors/Owners, Lawrence's Dairy Supplies (1995) Inc.
  • Portal Login