Dennis is great! He is very quick to respond to questions and has handled our somewhat complicated taxes for several years now.

Dennis provided outstanding services regarding my tax return. He responded to my initial email within a few hours. He prepared my return within 24 hours of receiving my documents. The process was the most efficient and pleasant I have experienced. Dennis provided advice on a tax question I had. Dennis is professional, responsive, and courteous. His fees are fair. I am grateful to have found him. read more

We were recently looking for a CPA in our area and happen to see the great reviews for Dennis on Yelp. I reached out to Dennis for an introduction of his services and found him to be very responsive and knowledgeable. Dennis followed up with us in a very prompt fashion and answered all of our questions in a through manner. I would highly recommend Dennis for your tax and accounting needs. read more

We were looking for a new CPA to do our taxes since the one we used for 30 years was no longer able to practice in CA. I looked over the Yelp reviews and reached out to Dennis. Every process surrounding our tax preparation (introduction, ease of use of upload of documents to a secure portal) was very streamlined. We did not have to leave our desk! Amazing! Easy! Dennis is very responsive, professional, and knowledgable. He is super fast on returning emails, patient, and very detailed. Rates are very reasonable for a CPA in South OC. We are very happy to have found Dennis. We will be using Dennis for our tax needs for years to come. Thank you so much Dennis! read more

Like...WOW! Yes, I trend toward only writing reviews for businesses that I have a positive interaction with, but I assure you that I am nothing if not sincere. This guy is GREAT! I have had a nagging feeling that my 2023 filings were "off". I had done them myself and I work with goverment tax forms in my line of work, so I should have been confident...but I was not. Even though I had met the April deadline for filing. I routinely looked my completed forms over and over again and couldn't make heads or tails of where I went wrong... Why do I owe so much??! I had contacted another CPA I was referred to, (email/voicemail), a few weeks back regarding my concerns/interest in working with them and received no response...NONE. Enter Mr. Tyrrell. From the time of initial engagement, (I had sent him a brief inquiry via email this morning), to completion of my amended returns took no more than two hours! Did it require some work on my part? Sure. I had my documents ready to go and was able to upload them electronically, (securely of course), for his review. That being said, this Professional is exactly that. Mr. Tyrrell is responsive, a clear and concise communicator, gives easy-to-follow instructions, and GETS IT DONE! Isn't working with a CPA kind of "spendy"? It certainly can be, but I found his rates to be in line with most tax professionals and his work, (with a big emphasis on his responsiveness here), is well worth it! If you've got tax complications and don't know where to turn, contact Dennis Tyrrell. He will get you sorted! See you next Spring, Sir! read more

A really solid CPA. Has done our taxes for years. Very competent, and does a great job of explaining everything that he does. Well worth his reasonable billing. read more

Extremely communicative via e-mail. Detailed and provided transparency when it came to services. Competitive pricing. Would highly recommend! read more

Dennis has done my taxes for 2 years now. He does a great job every time. He is prompt, professional and well informed. I would highly recommend him. Affie A. read more

I reached out to several CPA's and of all I reached out to Dennis was the most prompt and professional. Within an hour I had pricing and I was sent all the information I needed to get my taxes done. Over the holiday weekend I uploaded my documents to Dennis and within a day not even my taxes were ready for review. Thank you Dennis for the prompt, professionalism. I definitely look forward to connecting with you next tax season. Also, his pricing was very reasonable and competitive. read more

Dennis is an outstanding CPA. We had used several in the past with mixed results. Dennis is extremely professional and does an outstanding job to ensure that our taxes are properly filed. If you are looking for the best CPA in South Orange County, reach out to Dennis. Thank you Dennis! read more

I just realized that when I last reviewed (on 3/31 under Sal M), I think I logged in incorrectly, but that 5-star rating is real. I am adding an additional rating. Since doing my taxes, I asked Dennis to go over some special tax situations I am facing. These are things like some stock options, gifting to charity and children, and a few other more complicated issues around investments and retirement planning. Dennis was very responsive and very knowledgeable. His information is helping me plan for the coming tax years and retirement. I highly recommend him. read more

I am so thrilled I found Dennis via Yelp. He made tax prep easy, fun, and fast. And, he was super responsive to any questions or following up with me to let me know if he had all the documentation he needed. For the first time in 4 years, I received a refund. In addition, Dennis looked at my prior returns and found mistakes (my mistakes) that he could correct and get me money back. Needless to say, I am sticking with Dennis for years to come and I can't recommend him enough. read more

Dennis has been taking care of my tax return filings for the last two years or so. I like Dennis's professionalism in all aspects. He is reachable when I have questions for him, communicates promptly and makes filing my taxes easy and expeditiously. I highly recommend Dennis Tyrrell CPA for your personal and business tax return filings on a State and Federal level. read more

Fantastic! Quick, professional, patient and so organized... the BEST Tax experience I've ever had. EVER.

Dennis is amazing!! My previous accountant booked up and I was in a bit of a bind. Super responsive, very easy process, 10/10 would recommend. Thanks, Dennis! read more

Didn't use the business but they returned my call and was ready to help with my taxes

Very dependable CPA, extremely detailed, thorough and one of the most organized people I have ever worked with. He's flexible on scheduling, goes out of his way to meet you in locations that are convenient and really knows his stuff. I would highly recommend him to anyone and have referred him to others. read more

I used to file my taxes online through a free software until I received a fine from the IRS for filing incorrectly. I searched for a tax preparation service and decided to contact Dennis. He was very helpful and professional through the whole process! With his guidance, we were able to lower the amount of money we owed in 2020 compared to what the online system was stating. For 2021, we might actually get a refund thanks to his suggestions. I highly recommend his services and look forward to working with him in upcoming years. read more

I had my taxes done by Dennis this year and although tax season and doing taxes is not my favorite part of the year, Dennis made it simple and as painless as possible , great communication leaves no stones unturned and is just a joy to deal with , Dennis is my choice moving forward when taxes are due, he should be yours too , give him a try you will not regret it ! read more

Dennis has been my tax preparer for a few years now and he makes the whole process so easy , he is prompt respectful and honest , qualities that rate him among the best . read more

Dennis has been great. This is the first year I am using him for personal taxes and I am very happy with him. I have a couple complicated issues but Dennis knows exactly how to address them. He is very knowledgeable and is very responsive. I highly recommend him. read more

We just started working with Dennis and we are very impressed with his speed, responsiveness and overall service. We are grateful that we are saving $$$ with him. Highly recommend!!!!! read more

I am very pleased with Dennis as my accountant. I had a number of complex issues which he navigated with ease including small business income. Dennis prepared both federal and (multiple) state returns. He was professional and efficient. We were able to communicate easily through phone and email and I felt I was given personal attention at a fair price. read more