The restrictions, which members of the Presidential Inaugural Committee cautioned have yet to be finalized, represent a continued march back from standards set in 2009, when President-elect Barack Obama banned gifts from lobbyists, political action committees and corporations, and put a cap of $50,000 on individuals.
Mr. Obama relaxed his own rules in 2012, after what was then the most expensive presidential campaign in history had depleted his donor base, lifting the ban on corporate gifts and restrictions on the size of those from individuals.
Mr. Trump, who like Mr. Obama campaigned on reducing the influence of money in politics, appears poised to relax them further.
Officials planning the inauguration said Mr. Trump would solicit corporate donations up to $1 million and allow money to be transferred from political action committees on a case-by-case basis. The inaugural committee has not reached a decision on where to cap gifts from individuals, if at all.
All told, Mr. Trump hopes to raise roughly $65 million to $75 million to fund the parade, balls and other festivities surrounding his swearing-in as president, according to several people involved in the planning efforts.
Such a fund-raising total, if it materializes, would easily surpass the $43 million Mr. Obama's team raised for his 2013 inauguration and the $53 million, a record, that it raised for his first inauguration in 2009.
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Thomas Barrack Jr., a private equity investor who is heading the committee responsible for planning the events surrounding Mr. Trump's inauguration on Jan. 20, said the decision to limit donations from certain groups was "in line with the president-elect's thoughts on ethics reform."
But campaign finance experts said the restrictions left much to be desired, targeting groups that traditionally provide little funding for the occasion while seemingly letting bigger donors — including corporate interests that Mr. Trump took aim at on the campaign trail — off the hook.
"For the most part, they are illusory, because they are restricting money that doesn't really play any significant role in funding the inauguration," said Fred Wertheimer, a longtime advocate of campaign finance overhaul, referring to the restrictions on lobbyists and foreign interests.
The corporate and individual money that does traditionally play a significant role, he added, would be allowed to flow more or less unabated, leaving the potential of undue influence in place.
"You can't have a more ideal opportunity to buy influence and ingratiate yourself with a new administration than by giving a huge contribution to pay for their inauguration," Mr. Wertheimer said.