THE BURNED OVER DISTRICT

And despite the pissing and moaning about how 100 Days means nothing, Donald Trump really, really wants a bigly win at the beginning of his reign. So with that in mind, he has promised something yuge about taxes for Wednesday.

President Trump promised on Friday that he would unveil a “massive” tax cut for Americans next week, vowing a “big announcement on Wednesday,” but he revealed no details about what is certain to be an enormously complicated effort to overhaul the nation’s tax code.

Mr. Trump offered his tax tease in an interview and again during remarks at the Treasury Department on Friday afternoon as he raced to stack up legislative accomplishments before his 100th day in office at the end of next week.

His announcement surprised Capitol Hill and left Mr. Trump’s own Treasury officials speechless as he arrived at the Treasury offices to sign directives to roll back Obama-era tax rules and financial regulations. Earlier in the day, when reporters asked Steven Mnuchin, the Treasury secretary, how far away a tax overhaul proposal was, he said he could not give an answer. “Tax reform is way too complicated,” he said.

Mr. Trump told The Associated Press in the interview that his tax reductions would be “bigger, I believe, than any tax cut ever.” But he faces an enormous fight among clashing vested interests as Congress tries to rewrite the tax code.

He has dumped an impossible task on his Treasury minions made even worse by his failure to work with the members of Congress who will do any actual enaction upon taxes.

Starting that fight next week is further complicated by Mr. Trump’s hopes to revive the Republican health care plan that collapsed last month. And it would mean trying a tax overhaul as his White House faces the prospect of a government shutdown if lawmakers cannot agree on a funding bill by April 28.

The details of Mr. Trump’s tax plans remain the subject of intense speculation, with stock markets regularly gyrating when White House officials discuss the subject. Since taking office, the president has suggested that he wants to enact the deepest cuts to individual and corporate tax rates in history.

But despite Mr. Trump’s statement on Friday that his tax overhaul “really formally begins on Wednesday,” White House officials quickly cautioned against high expectations that Mr. Trump would provide the legislative text of a detailed tax plan next week.

Instead, a senior administration official said the president would release only the “parameters” that Mr. Trump expected a tax plan to follow in the long congressional debate that would surely follow. Another official said the information released next week would be more like a “broad” outline. Wall Street, which tends to celebrate tax cuts, barely reacted; the Standard & Poor’s 500-stock index was down 0.3 percent Friday.

The administration has maintained that middle-income tax cuts, a simplification of personal income taxes, and making business taxes more competitive with other countries are the top priorities. Mr. Trump insisted that his plans were on track and that his strategy to remake the economy would change history.

And his crack staff immediately performed damage control to clarify what would be done but the damage has already been done. They can only hope he doesn't go off script when he reveals his beautiful massive tax cut plan.