Top 40 Audit Services in Ontario
The Best of December 2025Looking for a top audit firm in Ontario?
Auditing involves working with an auditor, or third-party, to look into your business and financial records and processes. Auditing helps uncover areas of non compliance or inefficiencies in your accounting processes, which makes it easier to address these issues. The auditing process includes requesting financial documents, preparing and presenting an audit plan that outlines timeline and information needed for the audit, conducting the audit both on-site and remotely, and planning and presenting findings.
To assist you in your search for a partner, we’ve compiled this list of the top audit services in Ontario. Browse descriptions, feedback, and awards to find which can best suit your company’s needs.
List of the Best Ontario Audit Firms
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1Undisclosed10 - 49 employeesToronto, CanadaMIAccounting & Income Tax Inc. Is an accounting company founded in 2008. The company offers accounting and has a small team. The company is located in Toronto, Canada.Read More
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2Undisclosed10,000+ employeesToronto, CanadaDeloitte is a large Business Consulting company based in Toronto, Canada and New York, New York. Their services include Business Consulting and Commercial Financing.Read More
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3$50,000+250 - 999 employeesToronto, CanadaFounded in 1996, MB Accounting is an Accounting company. The team provides Accounting and Financial Advising & Planning.Read More
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4Undisclosed50 - 249 employeesBurlington, CanadaLaunched in 1940, DURWARD JONES BARKWELL & COMPANY LLP is an Accounting company. The midsize team focuses on Accounting and Business Consulting.Read More
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5Undisclosed10 - 49 employeesToronto, CanadaHR Accounting Group, an Accounting company, is headquartered in Toronto, Canada. The team offers Accounting and Business Consulting.Read More
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6Undisclosed10 - 49 employeesMarkham, CanadaLaunched in 2010, Jiong Gao Professional Corporation, a small Accounting company, is headquartered in Markham, Canada. Their services include Accounting.Read More
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7$1,000+10 - 49 employeesRichmond Hill, CanadaConversion Optimization company IT Solutions Canada specializes in Conversion Optimization and Cybersecurity. They are in Richmond Hill, Canada.Read More
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8$1,000+2 - 9 employeesMississauga, CanadaPro Finance E&E, an Accounting company, is based in Mississauga, Canada. They offer Accounting and Finance & Accounting Outsourcing (FAO).Read More
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9Undisclosed2 - 9 employeesToronto, CanadaKrigstin & Xu LLP is an Accounting company. Their small team is located in Toronto, Canada. Their services include Accounting.Read More
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10Undisclosed2 - 9 employeesLondon, CanadaMultiTaxServices is a small Accounting company. Founded in 2023, the team offers Accounting and Financial Advising & Planning.Read More
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11$1,000+2 - 9 employeesToronto, CanadaLaunched in 2020, Funnelii is a branding agency. The team offers Branding and Social Media Marketing.Read More
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12$1,000+10 - 49 employeesMississauga, CanadaMohit Grover is a Commercial Financing company. They are headquartered in Mississauga, Canada and have small team of experts. Their services include Commercial Financing and Accounting.Read More
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13$1,000+2 - 9 employeesNewmarket, CanadaMoaaz.ca is an Accounting company. The team is based in Newmarket, Canada, and their services include Accounting.Read More
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14Undisclosed2 - 9 employeesToronto, CanadaLaunched in 2022, CoPilot Tax, a small Accounting company, is located in Toronto, Canada. Their team specializes in Accounting.Read More
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15Undisclosed2 - 9 employeesBrampton, CanadaFounded in 2018, SS Mann Services is an Accounting company. The company offers Accounting and Finance & Accounting Outsourcing (FAO), and is small.Read More
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16Undisclosed2 - 9 employeesOakville, CanadaFounded in 2022, SmartSource Technologies, a small branding agency, is located in Oakville, Canada and Thane, India. Their services include Branding and ERP consulting and SI.Read More
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17Undisclosed2 - 9 employeesToronto, CanadaAwerix CPA Professional Corporation is an Accounting company. Their small team is based in Toronto, Canada and Mississauga, Canada. Their services include Accounting and Business Consulting.Read More
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18Undisclosed10 - 49 employeesHamilton, CanadaPettinelli Mastroluisi LLP is a small Hamilton, Canada-based Accounting company. The team offers Accounting and Business Valuation Services.Read More
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19$1,000+50 - 249 employeesKitchener, CanadaBack Office Outsourcing company ActRatio was established in 2018. The team provides Back Office Outsourcing and Accounting and is located in Kitchener, Canada.Read More
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20Undisclosed2 - 9 employeesMississauga, CanadaWealthy Wave Accounting Inc is an Accounting company. Their small team of employees is in Mississauga, Canada. Their team provides Accounting and Finance & Accounting Outsourcing (FAO).Read More
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21$1,000+2 - 9 employeesBrampton, CanadaLaunched in 2018, AnalytIQ Consulting, a small Digital Strategy company, is based in Brampton, Canada. Their team specializes in Digital Strategy and Business Consulting.Read More
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22Undisclosed2 - 9 employeesOttawa, CanadaArmstrong Jones LLP is an Accounting company. Their team is in Ottawa, Canada and provides Accounting and Business Consulting.Read More
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23Undisclosed2 - 9 employeesRichmond Hill, CanadaXu & Xie CPA LLP is a small Richmond Hill, Canada-based Accounting company. The team offers Accounting and Business Valuation Services.Read More
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24Undisclosed10 - 49 employeesOttawa, CanadaLekadir LLP is an Ottawa, Canada-based Accounting company. They offer Accounting and Business Consulting and were founded in 2022.Read More
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25$1,000+2 - 9 employeesMilton, CanadaFinHarvest is an Accounting company launched in 2023. Based in Milton, Canada, their small team provides Accounting and Financial Consulting.Read More
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26Undisclosed2 - 9 employeesRichmond Hill, CanadaIMPACT CPAs LLP is a small Business Consulting company. Launched in 2010, the team provides Business Consulting and Commercial Financing.Read More
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27Undisclosed2 - 9 employeesOttawa, CanadaOrion Canada Inc. Is a Business Consulting company. They specialize in Business Consulting and Finance & Accounting Outsourcing (FAO) and are headquartered in Ottawa, Canada.Read More
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28Undisclosed2 - 9 employeesAjax, CanadaHeadquartered in Ajax, Canada, MMS Accounting & Bookkeeping Services is an Accounting company. The team focuses on Accounting.Read More
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29Undisclosed10 - 49 employeesVaughan, CanadaCebridge is a Vaughan, Canada-based Accounting company. They provide Accounting and Financial Advising & Planning.Read More
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30Undisclosed50 - 249 employeesOakville, CanadaEVAMAX Group, a branding agency, focus on Branding and Application Testing. They were founded in 2003.Read More
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