Therrien Accounting
Established 2002
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Therrien Accounting provides personalized tax preparation, bookkeeping, and business consulting services to individuals, small businesses, and corporations in the Glen Williams and Halton Hills area. Led by CPA/CMA Melissa Therrien with over 20 years of experience, the firm offers comprehensive accounting support including payroll processing, financial statement preparation, and fractional CFO services.
Additional Information
Therrien Accounting has been located in and servicing clients in Halton Hills for over a decade. The firm relocated to the historic 511 Main Street building in Glen Williams in 2018 and plans for expansion. The company focuses on providing practical, personalized accounting support and is involved in community activities.
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Established 2002 · Serving Halton Hills, Glen Williams
Additional information extracted from the firm's public website. Last updated: July 9, 2026
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Claim This ListingFrequently Asked Questions
How much does an accountant cost in Halton Hills?
Personal tax returns: $150-$400 depending on complexity. Small business bookkeeping: $300-$800/month. Corporate tax returns: $1,000-$3,000+. Many accountants offer free initial consultations to discuss your needs and pricing.
What's the difference between a CPA and a bookkeeper?
CPAs (Certified Public Accountants) are state-licensed, can audit, provide tax advice, and represent you before the IRS. Enrolled agents are credentialed by the IRS itself and specialise in tax filing and IRS representation. Bookkeepers handle day-to-day transaction recording and basic financial reports. For audits and complex planning you want a CPA; for tax filing and IRS representation an enrolled agent is often the better value.
When should I hire an accountant?
Consider an accountant if you're self-employed, own rental property, have investment income, run a business, received an IRS notice, or your tax situation is more complex than a simple W-2. The cost of an accountant often pays for itself in tax savings.
Can an accountant help if I'm behind on taxes?
Yes. Accountants regularly help clients catch up on unfiled returns. They can also help with IRS voluntary disclosure, negotiate installment agreements or an offer in compromise, and handle notices, amended returns and audits.
Is it worth paying for tax preparation vs doing it myself?
If you have straightforward W-2 income and take the standard deduction, free software works fine. But if you have self-employment income, rental properties, investments, or business expenses, a professional accountant typically finds deductions that more than cover their fee.