MD
McCay Duff LLP
Expert accounting and business advisory services for growth and clarity in Ottawa.
4.8
Accountant
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Expert accounting and business advisory services for growth and clarity in Ottawa.
McCay Duff LLP is a premier accounting and business advisory firm located in Ottawa, offering comprehensive financial services and strategic coaching for individuals, entrepreneurs, and small to medium-sized businesses. With a team of highly qualified professionals, including certified accountants and advisors, the firm combines deep financial acumen with practical entrepreneurial insights to help clients achieve their goals. Known for their personalized approach, accountability check-ins, and actionable plans, McCay Duff LLP provides reliable support that enhances efficiency, morale, and peace of mind for long-term success.
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Comprehensive financial management including tax preparation, bookkeeping, and personal/professional accounting support.
Strategic coaching and planning to identify growth opportunities, improve efficiency, and set actionable goals for businesses.
Expert guidance on financial strategies, risk management, and investment planning tailored to client needs.
One-on-one coaching sessions with regular follow-ups to ensure implementation and track progress toward business objectives.
Proactive tax strategies and compliance services to optimize financial outcomes and minimize liabilities.
Claim McCay Duff LLP to update business info, respond to reviews, and access analytics.
Overall rating
Marc Morin
I’ve known the team at McCay Duff for a number of years and hold the firm in high regard, having shared several clients. Earlier this year, I began working with Dianna Larkin in her capacity as a business advisor and coach. From a coaching standpoint, Dianna possesses an exceptionally rare combination: she’s a highly qualified and credentialed professional accountant, an entrepreneur, a partner in a successful firm, and a certified advisor/coach. With this blend of expertise, she brings perspectives that few others can—combining deep financial acumen with the empathy that comes from understanding the entrepreneurial journey firsthand, as well as the relational complexities that come with partnerships. Most importantly, as an advisor, Dianna doesn’t rely on her vast experience to simply tell you what to do. Instead, she skillfully guides you to uncover insights for yourself—often making you feel like it was your idea all along. Whether you’re running a small to medium-sized business or are an entrepreneur working independently or with a small team, I highly encourage you to reach out to Dianna and schedule an exploratory call. Her practical approach, one-page action plan, and regular accountability check-ins have had a massive impact not only on my results but also on my clarity and quality of life.
Ryan Whelan
We have been using Dianna and her teams accounting services for many years now. A few months ago we began to use her business advisory services and in just a few short months we are already seeing the benefits. Our staff is more organized, roles are more clear, pain points have been eliminated and overall staff moral has improved. She brings experience and value to the table. It's our responsibility to put the plan into motion and she does an excellent job with follow ups, communication and reminding us of the overall goal. We are well on our way to achieving our goals and we are excited to see what the future will bring. I highly recommend her firm to anyone looking to free up their time and add value to their business.
Evan Diamond
I went out on my own as an independent consultant a few years ago, and was asked by my clients to incorporate. Dianna, Jennifer and their team have been a treat to work with - very knowledgeable, professional, and easy to work with. I have been very pleased with the work they have done and the advice they have provided, and I recommend them highly.
Ryan Keeney
I sent them an email on June 2, 2025 to the email address posted on their “contact us” page. Now, almost 2 weeks later, nothing. I also called them that same day, and as I was describing my situation, they said “you emailed us earlier”, so I know they saw it. Even though their website says they do personal taxes, they were quick to tell me that they only take corporate clients. When I explained that I actually do own a corporation and own multiple real estate properties, I was then forwarded to someone else, who then in turn forwarded me to someone else again, but I only reached that third person’s voicemail. I left a voicemail but they never got back to me. I personally agree with the other 1-star review where the review said that communication and/or responsiveness seems to be an issue for them. Not sure how they accumulated so many positive reviews when apparently I’m not the only person encountering this issue.
Mauricio Vines
I have been working with McCay Duff since I started my business and they have been exceptional companions in this journey. Chris and Ryan have gone above and beyond setting me up for success. Their support, attention to detail, and guidance from the first meeting onward, have been instrumental to grow my business. They have always provided timely and effective support as new questions and challenges appeared. They genuinely care about the people they work with. I am deeply grateful to Chris and Ryan for their excellent work and impact, which has made a huge difference for me.
Monique Rivett-Carnac
This was our first time with Mc Cay Duff LLP. We are happy with the delivery, timing and patience they had with us. We had two account to marry our personal and business accounts. All went well, they were easy to approach in area where we didn't fully understand some of the processes.
