The other day, Andrea Parness, a CPA in Queens, New York, was working on a tax return. She was trying to figure out whether her client, a business owner, would qualify for a 20 percent tax deduction created under the new tax law.
Parness did the numbers with paper and a calculator. "And then I looked at the version on the computer, and the software came up with something completely different," she said. She then phoned a friend. Two, actually. Both CPAs.
"They both said, 'I think you're right. I think the software is wrong,'" she said.