The Trump administration has finally outlined its new tax proposal, which leans heavily on tax cuts.

So far, President Trump wants to slash individual tax rates -- cutting the top rate from 39.6% to 35% -- and reduce the number of total rates from seven to three. He also wants to cut the top tax rate for all businesses to 15%, far below the current top rates.

The administration's tax outline still leaves many questions unanswered and will be met with a lot of skepticism among lawmakers, even though Republicans control Congress. In fact, some GOP aides suggest that the White House -- with its emphasis on tax cuts and too few details on how they'd be paid for -- is not constructively contributing to a serious discussion of tax reform.

"It's not tax reform," one senior GOP aide told CNN. "Not even close."

Here's what we know so far about the president's tax proposal.

Lower individual income tax rates: The proposal calls for reducing the number of tax brackets from seven to three for individuals, which would be set at 10%, 25% and 35%. Today's rates are 10%, 15%, 25%, 28%, 33%, 35% and 39.6%.

But here's the thing: The White House has yet to specify how much of one's income would apply to each of the three rates that Trump is proposing. So it's impossible to say what the change would mean in dollars and cents for anyone.

During the campaign, Trump had originally called for those rates to be 10% 20% and 25%. He later amended his plan, calling for somewhat higher rates to match what House Republicans have been calling for: 12%, 25% and 33%.

The proposal also calls for doubling the standard deduction.

Treasury Secretary Steven Mnuchin said Wednesday morning that the new tax proposal will offer "the biggest tax cut and the largest tax reform in the history of this country." Without greater detail from the White House, that's impossible to verify.

Much lower business rates: Trump wants to slash the top tax rate for all businesses to 15%, as he proposed during the campaign. That's well below the top rate of 35% for corporations today, although the real top rate they pay is less after tax breaks.

A drop to 15% would also be a huge drop from the 39.6% top rate paid by owners and shareholders of so-called pass-through businesses. Those run the gamut from mom-and-pop shops to law firms and hedge funds. In a pass-through business, the owners and shareholders report profits on their personal tax returns.

One-time tax on overseas profits: The president will call for a low, one-time tax on the $2.6 trillion of profits that were earned overseas by U.S. multinational corporations and were technically never brought back to the United States.

Switch to a territorial tax system: Today, U.S. companies must pay tax on all their profits, regardless of where in the world those profits are earned.

Trump now joins Republicans who want to switch to a territorial system for businesses. That would mean U.S. companies would only owe U.S. tax on what they earn in the United States.

No border adjustment tax as proposed: Trump is not expected to back a controversial provision known as the border adjustment tax that was proposed by House Republicans.

"We don't think it works in its current form, and we will have discussions with [House tax writers] about revisions," Mnuchin said Wednesday morning at an event held by The Hill.

A border adjustment tax would fundamentally alter how imports and exports are taxed. Under the House plan, companies could no longer deduct the cost of their imported goods, and sales of their exports would no longer be subject to U.S. tax.

Such a provision could raise more than $1 trillion over a decade, which the House GOP was counting on to help offset the cost of their proposed rate cuts.

Trump has been a proponent of a selective import tax -- and has suggested he might favor a "reciprocal" tax. But he has yet to explain what that means.

Tax break for child care costs: An outline of the plan calls for tax relief for child care costs, but doesn't give much detail.

During the campaign, Trump called for two tax breaks to help ease families' child care costs. One would let parents deduct the average cost of child care in their state, based on their child's age.

The other would give a tax break to anyone who sets aside up to $2,000 a year to cover costs associated with child care and elder care.

The contributions would be tax deductible, then grow tax free.

Tax and child care policy experts have said both breaks, as proposed, would disproportionately benefit wealthier families. And in the case of millions of low- and middle-income families, the breaks could raise their tax burden when combined with Trump's other proposals to eliminate head of household status, repeal personal exemptions and raise the lowest income tax rate to 12% from 10% currently.

Eliminate most deductions: Trump is now aligning himself with House Republicans, by calling for the elimination of all deductions except those for mortgage interest and charitable contributions.

Originally he'd called for a cap on itemized deductions.

Repeal a string of taxes: As he did during the election, Trump will call for the repeal of the Alternative Minimum Tax, the estate tax and the 3.8% Medicare surtax that applies to wages and investments above a certain level.

-- CNN's Jeff Zeleny, Jim Acosta and Phil Mattingly contributed to this report