Welch LLP is a cornerstone of Ottawa's financial sector. They provide expert tax planning, audit, and advisory services tailored for both SMEs and large corporations, ensuring compliance and tax efficiency.
Best Tax Advisors in Ottawa Canada - June 2026
Canada / Ontario / Ottawa
Discover top-rated tax advisors in Ottawa, Canada, dedicated to optimizing your financial health. Our curated list connects you with professional experts for seamless tax planning and compliance.
Comprehensive accounting and tax advisory services for businesses.
Details
- Year Founded: 1918
- Employees: 200-500
- Price Range: $$$$
- Phone: +16132369191
- Email: info@welchllp.com
About the Company
Pros
- Extensive industry expertise
- Proactive tax planning
Cons
- Premium pricing
- Limited small-scale focus
National accounting and consulting firm with local expertise.
Details
- Year Founded: 1958
- Employees: 5000+
- Price Range: $$$$
- Phone: +16132393900
- Email: ottawa@mnp.ca
About the Company
MNP offers a personalized approach to tax strategy. Their Ottawa team specializes in navigating complex tax landscapes, offering specialized advice for various industries and high-net-worth individuals.
Pros
- National network reach
- Specialized tax knowledge
Cons
- Large firm service feel
- High client volume
Ottawa-based accounting firm focused on family and business success.
Details
- Year Founded: 1946
- Employees: 50-200
- Price Range: $$$
- Phone: +16137285831
- Email: info@ggfl.ca
About the Company
GGFL excels in providing strategic tax advice for family-owned businesses. They balance personal wealth management with corporate tax efficiency, maintaining a strong local reputation in Ottawa.
Pros
- Personalized client service
- Strong family business focus
Cons
- Localized focus only
Mid-market focused tax and financial advisory firm.
Details
- Year Founded: 1980
- Employees: 200-500
- Price Range: $$$
- Phone: +16132360503
- Email: info@collinsbarrow.com
About the Company
Collins Barrow provides exceptional tax advisory services for mid-market firms in Ottawa. They focus on minimizing tax liabilities through strategic planning and deep regulatory understanding.
Pros
- Strong mid-market expertise
- Collaborative approach
Cons
- Communication delays
Professional services firm offering global tax support.
Details
- Year Founded: 1921
- Employees: 1000+
- Price Range: $$$$
- Phone: +16132306782
- Email: info@bdo.ca
About the Company
BDO Canada delivers international tax expertise locally in Ottawa. Ideal for businesses with cross-border operations, they provide robust tax solutions and comprehensive financial consultancy.
Pros
- Global network
- Sophisticated tax tools
Cons
- High barrier to entry
Expert tax consulting for individuals and professional corporations.
Details
- Year Founded: 1946
- Employees: 50-100
- Price Range: $$
- Phone: +16132362367
- Email: info@mccayduff.com
About the Company
McCay Duff has built a legacy in Ottawa by providing reliable tax services. They are known for their precision in tax filing and strategic financial planning for high-net-worth professionals.
Pros
- Exceptional reliability
- Local market insight
Cons
- Modern tools limited
Bilingual accounting firm providing expert tax services in Ottawa.
Details
- Year Founded: 1985
- Employees: 50-100
- Price Range: $$$
- Phone: +16137458387
- Email: info@marcil-lavallee.ca
About the Company
Marcil Lavallée offers bilingual tax advisory services with a personal touch. They assist clients in navigating complex Canadian and Quebec tax structures effectively and accurately.
Pros
- Bilingual support
- Proactive tax advisory
Cons
- Niche service market
Middle-market advisory firm focused on tax efficiency.
Details
- Year Founded: 2017
- Employees: 500-1000
- Price Range: $$$$
- Phone: +16132306782
- Email: info@rsmcanada.com
About the Company
RSM Canada offers comprehensive tax solutions for the middle market. Their Ottawa team specializes in tax advisory, compliance, and risk management to help businesses grow confidently.
Pros
- Middle-market leaders
- In-depth technical knowledge
Cons
- Formalized processes
Boutique accounting firm providing personalized tax solutions.
Details
- Year Founded: 1995
- Employees: 10-50
- Price Range: $$
- Phone: +16137233261
- Email: info@wychreschuk.com
About the Company
Wychreschuk provides focused tax services for Ottawa small businesses. They offer a hands-on approach, ensuring clients get clear advice for complex tax matters without the corporate overhead.
Pros
- Personalized attention
- Transparent pricing
Cons
- Smaller capacity
Reliable tax filing and planning for local Ottawa firms.
Details
- Year Founded: 1975
- Employees: 50-100
- Price Range: $$
- Phone: +16137253457
- Email: contact@sw-cpa.ca
About the Company
S&W LLP focuses on delivering accurate tax compliance and strategic planning. They are highly valued by Ottawa entrepreneurs for their ability to streamline complex tax filings annually.
Pros
- Reliable filing
- Strong local presence
Cons
- High demand, limited slots
Global giant providing elite-tier tax advisory.
Details
- Year Founded: 1845
- Employees: 10000+
- Price Range: $$$$$
- Phone: +16135637200
- Email: ottawa@deloitte.ca
About the Company
Deloitte offers world-class tax advisory services in Ottawa. For large enterprises requiring complex tax planning and international compliance, their expertise is unmatched in the local market.
Pros
- Industry-leading expertise
- Global resources
Cons
- Extremely high costs
Leading Canadian firm for business tax advice.
Details
- Year Founded: 1924
- Employees: 2000+
- Price Range: $$$$
- Phone: +16135674000
- Email: info@ca.gt.com
About the Company
Grant Thornton helps Ottawa businesses grow by optimizing their tax positions. They focus on dynamic businesses, offering practical, forward-thinking advice that drives financial performance.
Pros
- Strong advisory focus
- National depth
Cons
- Corporate structure
Big Four firm with extensive Ottawa-based tax operations.
Details
- Year Founded: 1987
- Employees: 10000+
- Price Range: $$$$$
- Phone: +16132125764
- Email: info@kpmg.ca
About the Company
KPMG provides high-end tax advisory for government and private sector clients in Ottawa. Their deep bench of tax specialists handles everything from complex structuring to routine compliance.
Pros
- Unmatched depth
- Reputation and credibility
Cons
- Rigid consulting models
International tax advisory firm with local expertise.
Details
- Year Founded: 1907
- Employees: 10000+
- Price Range: $$$$$
- Phone: +16132373702
- Email: contact@pwc.ca
About the Company
PwC offers sophisticated tax advisory services in Ottawa, particularly for multinational clients. Their focus on digital transformation and efficient tax reporting makes them a top tier choice.
Pros
- Global expertise
- Innovation-driven
Cons
- Very expensive
Flexible and agile tax support for Ottawa startups.
Details
- Year Founded: 2005
- Employees: 10-30
- Price Range: $$
- Phone: +16137213444
- Email: info@tbccpa.ca
About the Company
TBC CPA is an excellent partner for Ottawa's growing startup scene. They provide essential tax planning and support that grows alongside your business, ensuring compliance and tax optimization.
Pros
- Agile service
- Startup-friendly
Cons
- Limited large corporate experience
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Frequently Asked Questions
FAQ
- What services do tax advisors in Ottawa provide? They offer tax planning, preparation, filing, and advisory services for individuals and corporations.
- How do I choose the best tax advisor in Ottawa? Look for certified professionals with local experience and positive client reviews.
- Do I need a tax advisor for simple returns? While not mandatory, a professional can identify potential deductions you might miss.
- Are tax advisors in Ottawa familiar with provincial laws? Yes, they are experts in both Federal and Ontario provincial tax regulations.
- What is the cost of tax advisory services? Costs vary based on complexity, but most charge hourly or per-return fees.
- When should I hire a tax advisor? It is best to consult with one early in the year to plan for tax season effectively.