For decades, presidents have publicly released their tax returns each year – an act of transparency and a way to connect and commiserate with Americans on Tax Day.

On Tuesday, president Donald Trump did not even file his taxes.

White House officials said Mr Trump, who has steadfastly refused to make any of his previous tax returns public, requested a six-month extension because of the complexity of preparing his 2017 returns. He plans to file by mid-October, officials said.

The announcement came on a day that the president and his allies used to remind people about Mr Trump’s sweeping tax cuts that will lead to savings for many people when the next Tax Day rolls around in April 2019.

“So many people are seeing the benefits of the Tax Cut bill,” Mr Trump tweeted from Mar-a-Lago, his estate in Florida, where he played host to the prime minister of Japan, Shinzo Abe.

In an article published in USA Today, Mr Trump wrote: “On this Tax Day, America is strong and roaring back. Pay cheques are climbing. Tax rates are going down. Businesses are investing in our great country. And most important, the American people are winning.”

That cheerful message on Tuesday was undercut by a system wide crash of the Internal Revenue Service (IRS) computers, which prevented taxpayers and preparers from filing returns online.

Many people file for more time to prepare their returns; IRS officials said they expected as many as 15 million to do so this year. But the president’s decision to seek an extension broke with years of tradition established by his predecessors and once again underscored the fact that Mr Trump’s tax returns remain secret.

Previous presidents have routinely filed their tax returns on time and released them publicly while running for office and once they assumed the presidency, in part to show how much they earned and how much they donated to charity.

Until Mr Trump.

His tax returns have long been a source of speculation and criticism. Mr Trump has said in the past that, as a businessman, he fought to pay as little tax as possible so that the government would not waste his money.

But he has insisted that he was advised not to reveal his tax returns as long as they were subject to a continuing IRS audit, a claim that critics have derided as little more than a convenient excuse.

All presidential tax returns are automatically audited, making it increasingly unlikely that Mr Trump will willingly release his returns while in office.

Although portions of Mr Trump’s returns have leaked in the past, they remain one of the most closely guarded secrets in Washington. Last year, the departing commissioner of the IRS, John A Koskinen, said that the agency was building a new vault to protect hard copies of the returns.

Given the president’s long-standing refusals, there was little expectation that Mr Trump would make his 2017 tax returns public. But the decision to seek a six-month extension came as something of a surprise.

Mr Trump filed last year for a similar extension of his 2016 taxes as he and his accountants faced the task of preparing a tax return for the first time as president.

But the president’s tax experts had more than a year to get ready for his 2017 tax returns. White House officials did not explain why Mr Trump’s accountants would need an additional six months.

The New York Times