Founded in 2006, Tonin & Co. LLP is based in Guelph, Ontario and primarily services clients across southwestern Ontario, with a growing client base internationally.

Working with local business owners and not-for-profit organizations to meet their comprehensive accounting needs is our passion. Our team of Chartered Professional Accountants (CPAs) are committed to being available and responsive to our clients at all times. Simply put, our clients’ best interests are our number one priority. At Tonin & Co, we strive to exceed expectations while ensuring our level of service is tailored to meet our individual clients’ needs.

Our expertise in long-term business management, including maximizing business value, business growth, and succession planning has been invaluable to our diverse client base. The trusted relationships with our clients are a collaborative partnership. We want to see businesses and organizations grow and thrive and approach every relationship with a team-based mentality.

We enjoy what we do, because we are more than just auditors or accountants. We take pride in building long-term relationships by helping businesses and organizations reach their goals. We also take pride in recruiting and developing our team members as they grow within our firm.

Tonin & Co, LLP is always looking for new clients. We offer complimentary initial consultations to better understand your needs and how we can be of assistance. Please feel free to contact us if you are looking for a reliable, trustworthy accountant and advisor who is always looking out for your best interests.

Please call our office at 519-822-5307 and ask to speak to Peter Tonin, Pat Brooker, or Tim Lopinski.



Our Team



Peter is a general practice partner at Tonin & Co. and has over thirty years of experience as a CPA and business advisor. Peter has amassed a wealth of experience as a trusted advisor to clients ranging across all industries. He is heavily relied upon for his expertise and creative thinking to help clients run their organizations, grow their businesses, and manage their finances.

A graduate of Wilfrid Laurier University, Peter has spent his public accounting career focusing on business growth and profitability, business acquisitions and sales, financing, and tax planning. He has been a Board of Directors member and Treasurer of numerous not-for-profit and charitable organizations throughout his career.

When Peter isn’t in the office, he enjoys spending time at his cottage in Southampton with his family, in addition to staying active by golfing, skiing and running. He is also a mentor to his daughter who is in the process of completing the CPA program.



Pat is a general practice partner at Tonin & Co. and has over twenty years of experience in accounting for businesses, municipalities and not-for-profit organizations. Pat leads our team of auditors and ensures we are consistently up to date with the ever-changing accounting and assurance standards. He is a File Quality Control partner for our larger clients.

Pat graduated from Wilfrid Laurier University. In addition to his time in public practice, Pat has worked in the private sector, which enables him to offer practical business consulting advice. He also enjoys working with small business owner-managers.

Pat spends most of his time out of the office with his wife and three sons, and enjoys exercise, and coaching hockey and football in his spare time.



Tim is a general practice partner at Tonin & Co. and is responsible for overseeing all aspects of the firm, with a focus on taxation. Tim strives to learn the unique features of each organization to build long lasting relationships while providing practical advice to clients across a wide range of industries in both the business and not-for-profit sectors. Tim grew up in an entrepreneurial household, where from a young age, he learned the ropes doing invoicing, payroll and bookkeeping for his father’s contracting business. Tim has since carried this passion for business and accounting into his career as a CPA.

Tim graduated from Wilfrid Laurier University and has completed the CPA Canada In-Depth Taxation Course. He is responsible for ensuring the latest changes in the world of taxation are considered for all Tonin & Co’s clients.

During his spare time, Tim enjoys travelling, cooking, attending concerts and spending time with his wife Stephanie and their family. He can also be found on the ice playing hockey, or at the gym participating in group fitness “boot camp” style workouts.



Greg enjoys working with clients across a broad spectrum of industries, including real estate and construction, professional services, manufacturing, automotive, charitable and not-for-profit organizations.

Greg graduated from Wilfrid Laurier University and completed his Diploma in Accounting there. He is currently Treasurer for the Guelph Minor Hockey Association.

Greg is newly engaged to his fiancée Andge and looking forward to his upcoming nuptials. As a sports fan, in his spare time Greg enjoys playing soccer and working on his golf game.



Joanne is a former partner of Tonin & Co. and has over thirty years of experience in accounting in both the public and private sectors.

A graduate of Wilfrid Laurier University, she specializes in accounting for not-for-profit organizations, charities, and owner-managed businesses including sole proprietorships and small corporations. Joanne also has significant experience in estate planning for individuals, including terminal returns and trust taxation.

Out of the office, Joanne enjoys spending time with her family, and loves to travel and cook.




Nancy joined the firm in October of 2019.  She comes to us with almost 30 years of experience in both the public and private sectors.

Nancy is also a certified Master Life Coach specializing in relationships and working with women.

In her spare time, she loves spending time with her husband Pat (yes that’s him at the top of the page), their three boys, family and friends.  She is a lifelong learner and enjoys being active and healthy.



Ashley graduated from Conestoga College and has been with Tonin & Co. since she was a co-op student. She enjoys the team environment in the office and continues to develop her skills by working on a variety of projects.

In her free time, Ashley loves to spend time with her fiancé Dan and their two cats. She also enjoys learning about cars and taking road trips.



Jacqueline joined the Tonin & Co. team after graduating from the University of Guelph, and has since rapidly developed her knowledge and skills by working on a wide array of client files spanning numerous industries.

She enjoys going to the beach in Goderich while visiting her family and playing soccer in her spare time.




Tony enjoys developing his accounting and taxation knowledge by working collaboratively with colleagues in a learning-friendly environment.

Outside of the office, Tony can be found on the soccer pitch or spending time with his girlfriend Rebecca and their dog, Bear.



Executive Assistant

Lorie is one of the key ingredients to the day-to-day success of Tonin & Co. She is always the friendly face greeting clients at the door, answering the phones, and performing a countless variety of tasks that keep things running smoothly.

She enjoys spending time at her summer home on Belwood Lake with her husband, Anthony, her daughters Amy and Amanda, and her grandchildren, Colton and Layla.


Office Manager

Joe is the Office Manager at Tonin & Co. and has been with the team for over twenty years. He has witnessed the growth of the firm and enjoys working with our people and keeping everyone on track.

When they aren’t busy babysitting their grandchildren, Joe and his wife Florie will often escape to their condo in Florida for a vacation.



Professional Services

Through our diverse client base and valuable years of experience, we have the versatility and expertise necessary to provide our clients with the highly personalized, quality service we are known for. We take care of the numbers so you can take care of what’s most important to achieving your personal and financial goals.

Accounting and advisory services

  • • Financial statement preparation (compilation engagements)
  • • Audits and review engagements
  • • Accounting system setup and bookkeeping support
  • • Management advisory services such as operational reviews, business enhancement, strategic planning, financial projections and forecasting/budgeting, internal control reviews, and feasibility studies
  • • Risk management and disaster/crisis management

Taxation services

  • • Strategic planning for tax minimization
  • • Corporate reorganizations
  • • Estate and succession planning
  • • Support for CRA audits and appeals
  • • Structuring business startups, mergers, and acquisitions
  • • Purchase and sale of business planning
  • • Preparation of T1 – personal tax returns
  • • Preparation of T2 – corporate tax returns
  • • Excise and payroll taxes including HST and provincial sales taxes
  • • Preparation of T1044 – Not-for-Profit Information Returns
  • • Preparation of T3010 – Charity Information Returns
  • • Assistance with compliance in other statutory filing requirements
  • • Scientific Research & Development Tax Credit (SR&ED)
  • • Assistance and co-ordination with compliance in US taxation filing requirements

Succession and estate planning

  • • Exit options and transition planning – keeping the business within the family or selling to a third party
  • • Strategic business management successor planning
  • • Valuation of the business and strategic financial planning
  • • Support during the sale including collaboration with legal counsel and review of draft agreements of purchase and sale
  • • Optimizing the strategy from an overall tax perspective
  • • Personal wealth management including maintaining your retirement lifestyle
  • • Transfer financing

Business mergers, acquisitions and sales

  • • Support from before the deal closes including consulting and performance of due diligence procedures
  • • Collaboration with legal counsel including review of draft agreements of purchase and sale, shareholder agreements, etc.
  • • Financing support for the transaction
  • • Optimizing the strategy from an overall tax perspective

Business financing, venture capital, government grants

  • • Preparation of information for banks/lenders including forecasts and projections
  • • Support and guidance in obtaining financing and venture capital
  • • Review of shareholder agreements

Litigation support

  • • Matrimonial separation issues
  • • Shareholder disputes, minority dissent and oppression
  • • Breach of contract
  • • Business interruption
  • • Property expropriation
  • • Personal injury
  • • Intellectual property disputes
  • • Misrepresentations



Our Clients

We proudly offer our services to a diverse client base across a number of industries. While the majority of our clients are located in Southwestern Ontario, we serve a diverse range of clients internationally.

Some of the industries we specialize in are as follows:

  • • Manufacturing
  • • Wholesale and distribution
  • • Retail
  • • Hospitality
  • • Construction and real estate
  • • Auto dealerships
  • • Transportation and logistics
  • • Professional services
  • • IT systems and technology
  • • Agriculture and food industry
  • • Financial services and insurance
  • • Not-for-profit organizations and charities




We’re always searching for the best and brightest candidates who excel in their field, and are co-operative team members ready to work with our team of professionals.

We accept resumes from co-op students and experienced professionals and keep them on file for one year.

Join us today to be part of an award-winning team:

Compensation and benefits

  • • We offer competitive compensation packages based on experience, including health benefits and group RRSPs
  • • We offer a flexible work schedule that allows team members to achieve a work-life balance
  • • Coaching and support
  • • We provide ongoing coaching and support for professional development and growth of our team members
  • • Community involvement
  • • We are supporters of numerous charitable organizations in our community and encourage staff to get involved with these organizations

If you’re interested in joining our team, please e-mail your resume to general@tonin.ca – only those applicants selected for an interview will be contacted.





We encourage you to contact us with any questions you have about your needs and our services.

Tonin & Co. LLP
350 Speedvale Avenue West, Suite 5
Guelph, Ontario N1H 7M7
Tel: 519.822.5307
Fax: 519.822.3153