Donald Trump's Presidential Inaugural Committee has raised a record $90million for the January 20 event - nearly as much as President Barack Obama's two inaugural committees combined.

Trump's committee has declined to provide details on how it's aiming to spend its hefty bankroll.

Obama's inaugural committees raised far less for the 2009 and 2013 events. They collected $55million the first time - some of which was not used - and $43million for the second.

And while the president-elect's team has raised more money than any president in history, Trump hopes to avoid a 'circus-like atmosphere' at the event, where he will recite the traditional 35-word oath.

Lead inaugural planner Tom Barrack said this week the Trump team is aiming for a 'back to work' mindset at the event, which will surround Trump 'with the soft sensuality of the place'.

Donald Trump's Presidential Inaugural Committee has raised $90million for his inauguration on January 20 - more than any other president in history

But the committee has declined to provide details on how it's aiming to spend its hefty bankroll for the event. Pictured above, construction workers put together the Inaugural platform in preparation for the swearing-in ceremonies Trump on the Capitol steps in Washington, DC

Steve Kerrigan, CEO for Obama's inaugural committee in 2013 and chief of staff in 2009, said the $90million fundraising haul looks like overkill.

'I can't imagine how they are going to spend that amount of money - and why they would even keep raising money,' he said.

'We planned the two largest inaugurations in the history of our country and we never spent anywhere near that.'

Trump this week promised a 'very, very elegant day' with 'massive crowds'. They'll arrive to find a party that isn't nearly as involved as Obama's.

Trump is holding three inaugural balls; Obama had ten balls at his first inaugural.

The president-elect's team also hopes to keep its parade to 90 minutes.

The longest parade, with 73 bands and 59 floats, lasted more than four-and-a-half hours, at Dwight Eisenhower's first inauguration, in 1953.

Trump's inaugural team has also failed to attract the kind of A-list performers who turned out in force for Obama.

Trump's announced headliners are teen singer Jackie Evancho, the Mormon Tabernacle Choir and the Radio City Rockettes.

Spokesman Boris Epshteyn said the inaugural committee is 'fully focused on organizing world-class events that honor our nation's tremendous history and reach every corner of the globe'.

Trump has said that any excess funds raised for the inauguration will be donated to charity. Pictured above, construction on the presidential reviewing stand on Pennsylvania Avenue in front of the White House in Washington

Any excess money raised for the event will be donated to charity.

Obama used his excess inaugural dollars to help pay for the White House Easter egg roll and other events in his first term, Kerrigan said.

Trump hasn't specified what charities might benefit from any leftovers, but some of his past pledges to donate to charity haven't always immediately panned out.

Trump's committee has 90 days after the inauguration to reveal its donors, although some presidents have reported donations as they came in.

A few contributors already are known. Among corporate donors, Boeing has given $1million and Chevron, $500,000.

AT&T says it has made both cash and in-kind donations, including quintupling phone capacity on the National Mall.

Alex Howard, deputy director of the private Sunlight Foundation, said the Trump inaugural committee is a 'major vector for corporations and individuals who wish to make donations and have influence on the presidency'.

He said the big donations and the lack of speedy disclosure 'set a tone' that has implications for the transparency and accountability of the new president.

President Barack Obama's inaugural committees raised $55million for his 2009 inauguration (pictured above) and just $43million for the second

Trump is holding three inaugural balls; Obama had ten balls at his first inaugural. Pictured above, Obama dances with wife Michelle Obama at the Home States Inaugural ball in 2009

To be sure, the inaugural lineup of balls, parade, reviewing stands, concert, dinners, bleachers and all the rest doesn't come cheap.

John Liipfert, who helped produce the Obama inaugurals, said big outdoor events in winter are particularly expensive, requiring robust sound and video systems, warming tents, fencing, barricades, security screeners and much more.

As for the balls, halls must be rented, stages built, lighting systems constructed and draperies and floral arrangements brought in to dress up the decor.

'You'd be amazed,' he said. 'There are a million factors going into it.'

And don't forget all those portable toilets. There were 1,100 along the parade route in 2013.

While a big share of the cost is covered by the private donations, taxpayers provide a considerable amount as well.

They're on the hook, for example, to cover the close to $5million cost of building the bunting-decorated 10,000 square-foot platform built on the West Front of the Capitol for the swearing-in.

Because the inaugurations are in the winter, they are more costly due to heating tents and other weather-related elements. Pictured above, Obama waves to the crowd during his 2013 ceremony

Trump's inaugural team has also failed to attract the kind of A-list performers who turned out in force for Obama. Pictured above, Beyonce performs at Obama's 2013 inauguration

Security is increased during the inaugurations (Obama's in 2013 pictured above with Joe Biden) due to the large crowds and increase in high-profile officials in the city

The public also pays security costs for an event that brings together a big chunk of the US political leadership, hundreds of thousands of ordinary Americans and a fair share of protesters.

Because those expenses are scattered throughout the federal budget, it's hard to get a fix on just how much the day will cost.

Some tabs are spelled out: $1.25million for the Joint Congressional Committee on Inaugural Ceremonies, which is responsible for the swearing-in ceremony, inaugural luncheon and review of troops, and $2.5million for overtime for US Capitol Police.

More than 5,000 active duty service members and 7,500 National Guard members will take part, too.

In 2009, spending by the military's inaugural joint task force and the Defense Department totaled $21.6million.

District of Columbia Mayor Muriel Bowser says the city expects to spend at least $30million, with the federal government reimbursing the full amount.