Client Reviews

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I was referred to Jim several years ago, He is very Knowledgeable , and very friendly, I have referred him other customers, and will continue to use his services for the foreseeable future. I highly recommend his company.

I have been a client of Jim's for years. He is knowledge about all the latest tax laws and updates from year to year. If you have any questions he quickly gets back with you. His availability always provides me with appointments that fit my schedule. I highly recommend MATS Accounting & Tax services.

I have used Mainwaring services for 11 years now. Jim (CPA) have always been very helpful he's able to break the complex tax process down in layman's terms so that i understand how it works. He's always up today on the many tax changes that we have. Highly Recommend him !!

My taxes are complicated, and have only gotten more so over the years. Jim has partnered with me to get my taxes done accurately and on time. I appreciate that. I refer my family to Jim and he takes care of them as well.

Jim has been my accountant for quite a while now. We met at a business group and I was impressed with his knowledge. You should use him; he knows his stuff.

I have been a client of Mainwaring Accounting & Tax Services nearly 9 years, and I am very impressed with the understanding, professionalism and care from Jim Mainwaring. I always refer any family, friends, or colleagues to Mr. Mainwaring because he has always provided me outstanding service.

Jim has provided excellent accounting services to my law firm for nearly 10 years since I have been in business. Law firm accounting is a challenge and I have appreciated his skill and expertise in keeping me in compliance with Florida Bar accounting rules.

MATS has provided CPA services to the Zellner Insurance Agency and BrightComp LLC since 2012. Jim Mainwaring has a high level of competence in the areas of accounting and tax. His advise has been invaluable, as he has helped guide our company through this period of continuous and substantial growth. MATS has provided excellent guidance, as we have upgraded accounting systems and structured the company for increased productivity and financial performance. I highly recommend MATS and Jim Mainwaring as a partner to support your small business and accounting needs. Sincerely, Ronald K. Hull, Chairman and CFO George A. Zellner Companies

Jim was incredibly helpful and knowledgeable when it came to setting up my business and tax needs. This was a scary process for me, but after all was said and done there was nothing scary about it! I would highly recommend Jim to anyone who needs assistance in setting up their business or with their taxes. Thanks Jim for being a rockstar, you’re brilliant.

Jim did our taxes for 2018 he was a complete professional and took care of every aspect of our tax issues. We had just moved from CA. This was our first full year living in Saint Johns and we were completely new to the area. We were extremely excited to work with him. I would highly recommend his company and his services to any of my friends and family. I would give him five stars out of five. Best regards Geoff Marks & JoAnn Windsor

We have had several CPAs handle our business and personal taxes. Let's face it, nobody likes doing this stuff every quarter/year. However, Jim always manages to take the edge off the process. In addition to being a good CPA, he is also kind, patient and willing and able to explain things in a way non-CPAs can understand.

We have had several CPAs handle our business and personal taxes. Let's face it, nobody likes doing this stuff every quarter/year. However, Jim always manages to take the edge off the process. In addition to being a good CPA, he is also kind, patient and willing and able to explain things in a way non-CPAs can understand.

Again we had a great experience working with Jim Mainwaring on both our personal and business annual taxes. Jim helps us meet our tax goals and obligations by asking the right questions and efficiently doing the necessary tax preparation work. We highly recommend Jim and his team.

I have been a client at Mainwaring for a number of years and have always found Jim to be extremely reliable, knowledgeable and available. I would highly recommend him.

Jim Mainwaring has been doing my income tax returns for several years. I am very pleased with his service, in that he does a great job for a fair price. Jim is always willilng to discuss your return in detail to ensure that you understand exactly what is being submitted to the IRS. I would highly recommend his services.

Jim is my personal and business accountant. He keeps us inform, of all we must know about accounting and tax services to, run a successful business. I depend on his knowledge and honesty. I recommend - Mainwaring Accounting & Tax Services, LLC. Ms. Annie's Catering Jacksonville, FL

I was very gratified to find an Accountant knowledgeable such as Jim Mainwaring. He is very thorough, answers any questions you may have in a detailed and factual manor. His website is easy to share supporting documents and communicate when need arises. He is very punctual and time driven with my yearly taxes, reviews all materials pertinent to income tax filing with the IRS. I would recommend fully with any and all matters relative to accounting issues. I trust his integrity and would rate his performance as a solid 5.

Jim is a great accountant! He is very knowledgeable and I love working with him for my business and personal tax needs. I highly recommend him.

Jim is very personable and does a great job of making sure he gets everything he needs from you to minimize your burden. Tax time made easy, he’s well worth the investment.

Jim is very personable and does a great job of making sure he gets everything he needs from you to minimize your burden. Tax time made easy, he’s well worth the investment.

Excellent service. Our company has an unusual model, but it was no problem for Jim, he communicated flawlessly and delivered on time, as promised.

I have known Jim for many years and he consistently focuses on working with his clients to obtain the best outcome possible, within the IRS guidelines. The price for his services are better than the industry average and I have never had any recourse from all the years of my filings. I highly recommend Jim for his accounting and tax services.

The best accounting firm in town and very insightful!!

Jim is very knowledgeable and customer friendly. I appreciate the way he explains things and give helpful suggestions.

Jim gives you the personalized attention that you dont get from the bigger firms. I have been dealing with tax services for over 35 years and I have found none to offer the quality service that Jim gives. I would recommend him especially to any small busineses.

I have been working with Jim since 2016. He is an invaluable part of my business. His professional insights, financial savvy, timely and accurate tax help allow me to focus on growing my business. Thanks Jim!

Jim is an excellent source of information and guidance. He is always patient, detailed, and friendly. I would recommend his services to anyone, whether for personal or business accounting and tax services.