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Thinking Beyond Numbers


Serving our clients with integrity, trust and professionalism for over 70 years.

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Thinking Beyond Numbers


Serving our clients with integrity, trust and professionalism for over 70 years.

McCay Duff LLP Chartered Professional Accountants provides a full range of accounting, tax and business consulting services to small to mid-sized businesses, not-for-profit organizations, charities and individuals. We provide peace of mind by helping our clients understand their numbers, minimize their taxes and maximize their wealth.

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McCay Duff has been at my side for more than 20 years, through good times and bad. Not only do they provide great accounting services, but I know I can count on them to give me sound and reasoned financial advice, the kind that lets me sleep well at night.
— Mark Kovalsky President Voice Innovate Corporation
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Personalized Service


We build our service around you and your needs.

Personalized Service


We build our service around you and your needs.

From the automotive, advertising and retail industries to the medical profession, developers and dairy producers, the financial specialists at McCay Duff are proud to service clients across a broad cross-section of Canadian sectors and industries.

Regardless of the type of personal or business interest you have, we can give you the financial advice—and the peace of mind—you deserve.

To learn more about how McCay Duff can help you achieve your financial goals, contact us today by calling 613-236-2367 (toll-free at 1-800-267-6551) or emailing us at info@mccayduff.com.

As a small-business person, it seems I am constantly reacting to changing circumstances. The people of McCay Duff are always there when I need them—they always find the time to meet with me, discuss the issues and give me valuable, helpful advice.
— Pierre Vachon, President AMS Imaging Inc.
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Serving SMall businesses, not-for-profits, charities and individuals for Over 70 Years


Serving SMall businesses, not-for-profits, charities and individuals for Over 70 Years


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Established in 1946, McCay Duff LLP, Chartered Professional Accountants has become synonymous with integrity, trust and professionalism in the National Capital Region. We provide a full suite of accounting services to a broad list of clients from a wide range of sectors.

Here is what sets us apart:

  • Our team approach ensures you get the best service and advice.
  • We focus on the big picture—we set you up for success and make your life easier by taking care of all of your accounting and financial-services needs.
  • We are committed to keeping you informed to ensure you have peace of mind.
  • Our competitive rates make success affordable.
  • Our easy-to-find downtown location makes seeing us convenient.