Here’s what we learned from the document, as well as the big tax questions the White House still hasn't answered.

1. A bigger tax cut for the middle class

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During the campaign, President Trump proposed massive tax relief for the wealthy. With this new statement of principles, it appears the White House may be moving in the direction of doing somewhat more for the middle class — though the details are unclear.

Currently, households do not pay taxes on a certain minimum amount of income, depending on size and family status. During the campaign, Trump proposed exempting households from paying taxes on their first $15,000 in income, regardless of the type or size of the household. He also proposed bringing the minimum marginal rate that ordinary households pay on their income up from 10 percent to 12 percent.

According to the new document, there would be no increase in that minimum rate. Households would be able to avoid taxes on their first $25,200 in income for a married couple (the figure for individual taxpayers would be half that), but on top of that, there could be additional exemptions depending on the size of the household, as in the current system.

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The document does not say anything about those personal exemptions, as they are called, and how Trump intends to handle those exemptions is crucial to how his plan will affect ordinary families.

Meanwhile, the uppermost marginal rate — paid by the most affluent households — will be 35 percent, according this document, as opposed to the 33 percent that Trump proposed during the campaign. (It is currently just under 40 percent.)

Another piece of evidence suggesting that Trump and his aides want to do more for working-class taxpayers is that the White House is looking for a new direction on child care.

Trump was the first Republican presidential nominee to propose federal child-care benefits, but his plan was criticized because it would disproportionately help wealthy parents. A senior administration official told The Washington Post Tuesday that Trump’s staff is trying to find a way to address those criticisms. Wednesday’s document states that child care will be part of Trump’s plan but offers no further details.

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2. A bigger tax cut for the rich

The plan is still a boon for the rich, however. Trump would repeal the estate tax, which is levied on the inheritances of the wealthy. The richest 10 percent of taxpayers are projected to pay 90 percent of estate taxes this year, according to the nonpartisan Tax Policy Center.

Trump would also repeal a fee on wealthy taxpayers’ investments imposed as part of President Obama’s health-care legislation, also known as Obamacare. Most economists believe that reducing the rate on corporate income to 15 percent would mainly benefit those who own stock in those corporations, who tend to be richer.

In all, Trump has so far proposed minor changes to his plan from the campaign. The Tax Policy Center forecast that 51 percent of the benefits from that plan would eventually accrue to the wealthiest 1 percent of taxpayers.

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3. Will Trump stick to conventional GOP wisdom?

A broader question is not how the plan would affect rich households as opposed to the poor, but what it would mean for the U.S. economy overall.

Many in the Republican Party argue that simply reducing rates is enough to encourage work and investment, since reduced rates imply that taxpayers can keep more of their income. Trump is proposing plenty of reduced rates, bringing them down to 35 percent for rich individual taxpayers and 15 percent for corporations and businesses.

Yet some conservative thinkers have argued while reducing rates could be beneficial, they are already very low by historical standards, and other changes to the tax system might be more important for growth. The document published Wednesday does not discuss these new ideas, such as helping taxpayers and firms recover the costs of new investments.

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An important caveat is that the document is very brief, and Republican lawmakers will have opportunities to share their ideas about how to stimulate the economy going forward.

4. How will Trump try to bring jobs back from overseas?

Criticism of international trade was paramount in Trump’s appeal to voters, but the document released Wednesday does not answer basic questions about whether he would address this issue in terms of taxes.

Trump and his advisers have repeatedly said they support some form of taxation on imports. One possibility is the plan proposed by Republicans in the House, including Speaker Paul D. Ryan (Wis.), which would tax imports at the regular rate on corporate income.

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Currently, companies are allowed to deduct any imports from the income on which they must pay taxes. The Republican proposal is known as a border adjustment.

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Another approach would be what Trump has described a “reciprocal tax,” which would aim to match taxes imposed on certain goods in different countries around the world with some corresponding tax in the United States.

The new document offers no information about how imports or exports would be taxed.

5. Is there a big loophole in the plan?

The success of Trump’s plan could depend on how successful his aides and Republican staff on the Hill are in avoiding a major loophole that could be created by his plan.

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Trump’s proposal would open up a major discrepancy between the rate for individual taxpayers (35 percent in the new document) and the rate for corporations and businesses (the document calls for 15 percent). That gives individual taxpayers a good reason to claim that they are, in fact, businesses to avoid taxes.

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The Tax Policy Center projects that taxpayers exploiting this potential loophole could reduce the taxes the government collects by $2.6 trillion over 20 years. That is more than half as much as the main component of the individual plan, the reduction in rates on ordinary income. The lower rates are forecast to cost $4 trillion over the same period.