Accounting Plus Financial Services
“I am deeply impressed by the professionalism of Peter Edrey and his ability to organize efficient and well-coordinated work of his office.”
Best Bookkeeping Services in Thornhill, ON
24 companies listed · 11 in Thornhill · 1 open 24/7 · 11 open weekends · 20 rated 4.5+
Data verified October 16, 2026
Zen Tax - Bookkeeping and Accounting
“The team is knowledgeable and patient, and they really make the effort to ensure all my questions are answered.”
Parsian Accounting, Payroll, and E-File Tax Services.
“I have been doing all my business and family accounts with this group for many years.”
Taraz Chartered Professional Accountants
“They were not only incredibly knowledgeable and up-to-date with all the latest tax laws but also extremely approachable and willing to explain complex financial details in simple terms.”
Hpan Group Corp
“Hamid has been outstanding, helping me run my business smoothly, managing my accounting needs.”
XYZ Accounting & Tax Services
“I feel I'm lucky I met Iris and can also count on her professional and serious work, We don't need to worry about my tax related issues.”
The 24 companies listed for Thornhill, ON handle day-to-day bookkeeping and sales tax filings for businesses. Details about packages and software come from each company's own website; ratings and quotes come from public reviews.
Area overview: Thornhill, ON
11 of the 24 companies we list are based in Thornhill; the other 13 serve Thornhill from towns including Toronto, Mississauga and North York. 21 of the companies on this page have a rating, from 4.3 to 5.0 across 2,361 reviews; 17 have 50 or more reviews and 20 are rated 4.5 or higher. The topics that come up most in reviews of the companies on this page are "knowledge", "efficient" and "patient". 1 is open around the clock; 10 are open on Saturdays and 7 on Sundays. The services the companies on this page list most often on their websites are bookkeeping (5), accounting services (4), bookkeeping services (4), payroll services (3) and business advisory (2). 10 have ten or more years of experience, the longest 30 years. 1 offers urgent consultations; 1 offers payment plans; 9 offer a free initial consultation and 1 is family- or locally-owned. We have a website on file for all 24 of the companies on this page; 22 publish a contact page; 22 list a public email and 5 take bookings online. We count these figures across the companies on this page; hours and prices change, so confirm the details with the company before you book a consultation.
Do any bookkeeping companies listed for Thornhill offer a free assessment?
9 of the 24 companies listed here offer a free initial meeting. Expect a quick look at the file, a count of monthly transactions and a quote. Bring access to the software, because a price given without seeing the books rarely survives contact with them.
IQ Accounting Professionals Corp
“I have been using their service in last two years and I am extremely happy with their services.”
Master Accounting & Tax Services
“We have been using Master Accounting and Tax Services for our family tax and small business needs, and we couldn't be happier with the exceptional service provided by Mitra.”
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Fiscal Expert
“I am also amazed at the tax strategy they have implemented over the last year that saved me money and significantly reduced my tax bill.”
Saman Accounting Services
Lynxpoint Business Management and Consulting
BBS Accounting CPA
“I'm a nightmare with my tax and the team always support me.”
Instaccountant
“Murtaza completed the taxes in a timely manner, while ensuring everything was thorough.”
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Sdg, Chartered Professional Accountant
“Cost-effective, motivated, and competent are just a few words I would use to describe my experiences with Sami at SDG.”
Stern Cohen Accountants
“They are extremely knowledgeable and have been able to help us restructure ourselves many times over in a very tax efficient way.”
Filing Taxes | Accountant Toronto
“I've used Filing Taxes for several years now and couldn't be happier!”
SAL Accounting
“I had the privilege of working with SAL Accounting for my personal and corporate tax needs, and the experience exceeded all expectations”
Magic Accounting & Tax Services
“Fast and easy tax filing, they are all professional”
SRJ Chartered Professional Accountants
“I just had a consultation with these folks (didn't need to proceed to the point of paid services) and was left with a very good impression.”
Accountor CPA Accounting Bookkeeping and Tax Experts
“I deeply appreciate the time and effort you've dedicated to working with me, whether through Zoom meetings or text messages.”
Capital Accounting and Tax Professional Corporation
“I really loved the way they handled it, Ayisha and Syed are two confident professionals who were very quick to respond to all my queries and provide me with the best possible solutions and maximum returns”
Diamond Chartered Professional Accountants
“Diamond CPA has excellent business and tax knowledge, I ever see.”
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Western CPA
“Go out of the way to accommodate you and have the best advise for you.”
Taxory Accounting & Bookkeeping
“We have worked with Anna for the last couple years and she has been very knowledgable, extremely quick in responding and overall great to work with!”
Why these companies made our list
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