Yup.....and that's why I started doing my own taxes.
When I first built my wash, a CPA depreciated my building over 31.5 years.
"Uh, gee I thought that it was 15 years for a car wash building..."
"I'll have to check on that".....to which he later said, "Gee, I guess your right".
And....why am I paying you over $100 an hour to not get it right?????
Now, I do my own tax work.....fill out the returns (using software), and pay a CPA $125/hour to "review" my work (different CPA). Usually, I'm in there less than an hour....and he often finds little things that I overlooked, or didn't file correctly.
I'm more confident than ever....that it's done right.