Thinking Beyond Numbers Serving our clients with integrity, trust and professionalism for over 75 years. Watch Video

Trusted Accounting Firm Serving Professionals and Businesses Throughout Ottawa

Finding the right accounting firm for your business, organization and/or personal needs requires more than just finding someone who can act as a ‘number cruncher’. To ensure you are maximizing your profits and other financial benefits while minimizing your tax obligations consistently, it’s important to partner with a firm that takes the time to get to know you and puts your interests first.

At McCay Duff LLP, we focus on building relationships with our clients so we can learn what is most important to them and help them meet their goals. We’re more than just an accounting firm. We act as trusted business advisors to many of our clients, providing proactive advice and strategic guidance specific to their needs, their industry and, most importantly, their financial goals.

Why Choose McCay Duff LLP?

A History of Strong Client Relationships and Personalized Service

Established in 1946, McCay Duff LLP has become synonymous with integrity, trust and professionalism in the National Capital Region. We provide a full suite of accounting, tax and business advisory services to a diverse clientele, many of whom have been with us for fifty years or more.

When you put your financial interests in the hands of McCay Duff’s team of professionals, you can rest assured that everything is done with your best interests in mind. As your trusted advisors, we strive to provide personalized service tailored to your specific needs. Whether helping you or your company maximize wealth while minimizing taxes or helping your not-for-profit meet its statutory requirements, we will remain by your side to improve accountability and ensure you are meeting your goals.


McCay Duff LLP is governed by stringent professional standards with respect to compliance, accuracy, confidentiality and privacy. As our client, you can rest assured that upholding these standards is of utmost importance to us. We are committed to providing you with peace of mind by keeping you informed throughout the duration of our relationship.


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, tax and advisory service needs. You can trust us to be proactive to steer you towards your goals.

Team Approach

Our team approach ensures you get the best service, value and advice possible. We work collaboratively to provide our clients with the benefit of the breadth of our collective knowledge and experience.

Personalized Service

As your trusted advisors, we strive to give you personalized service that is tailored to your specific needs. We will make it a priority to understand your personal and business goals, and your industry to ensure we continue to provide the ongoing support you require.

Experienced Professionals Serving a Wide Range of Industries

From automotive, advertising and retail industries to medical professionals, developers and not-for-profit organizations, McCay Duff’s financial professionals are proud to service a broad cross-section of clients. Regardless of your personal or business interests, we can give you the financial advice, and peace of mind, that you deserve.

We will provide strategic advice and straightforward guidance no matter your area of business, so you can make educated decisions that support your growth and success. In addition, we also offer targeted services for unique professional industries with specific accounting and business needs including medical professionals, real estate professionals, and not-for-profits. We have in-depth experience working with and advising clients in these and many other niche areas and we will put that experience to work for you.

International Affiliation to Benefit Cross-Border and Global Clients

McCay Duff LLP is a proud member of Allinial Global, an international association of accounting and consulting firms that enables its members to provide their clients with expertise and resources across the world in regions including the Americas, Europe, the Middle East, Africa and the Asian Pacific region. We are proud to have met the rigorous standards for a membership that allows us the opportunity to draw upon the depth and breadth of these resources in providing service to our valued clients.

Contact McCay Duff LLP in Ottawa for Comprehensive Professional Accounting & Tax Advice

The professionals at McCay Duff LLP are dedicated to our clients and to providing service and advice of the highest standards. We offer a wide range of services, enabling our clients to meet all of their financial and consulting needs with a single professional advisor. We are conveniently located in downtown Ottawa and can also arrange to meet with clients remotely with the assistance of user-friendly technologies. To learn more about how the Chartered Professional Accountants at McCay Duff LLP can assist you or your business, please contact us online, or by telephone at 613-236-2367 or toll-free at 1-800-267-6551.

McCay Duff LLP: Over 75 years of being Ottawa's trusted advisors for all of your personal and business needs

We strive to give you personalized service and peace of mind by understanding your needs and helping you reach your goals. Contact us to learn more about how we can help.


Lansdowne Park
979 Bank Street, Suite 210
Ottawa Ontario, K1S 5K5

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Phone: 613-236-2367 Toll-Free: 1-800-267-6551

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