John has been extremely helpful to me when I initially started my small business and was even more helpful when I had a dilemma dealing with the mortgage on my house. I have recommended him to...

TLDR: Unresponsive, not accurate, rude, and would have cost us thousands. This was the worst tax experience of my life. John was very short via email if he replied at all. In addition: 1) He...

John Costello has been preparing my tax returns for too many years to mention . Around June 20, 2021, I received a letter from the IRS stating that they needed more information to process the...

As a business owner John gives me piece of mind when it comes to my taxes. He is very dedicated to saving me money and for that I appreciate .

What a helpful guy. I inquired online, got a call nearly instantly, and he gave efficient and thorough advice on the phone without even needing to come in for an appointment. Very grateful for his...