WASHINGTON (AP) — On Tax Day, President Donald Trump and a chorus of Republicans announced that Tuesday's filing deadline marked the last time that figuring out taxes will drive Americans crazy. Not so.

Vice President Mike Pence hailed a new era of simplicity for tax filers starting next year in a tweet that also repeated the myth that the tax cuts are the largest ever. Trump himself, in USA Today, declared: "This is the last year Americans will fill out outdated, complicated tax forms."

The talking point spread like wildfire.

"It's out with the old and in with the new," said Sen. John Thune o...