(Bloomberg) -- House Republicans passed their version oflegislation to overhaul the U.S. tax code byslashing the corporate tax rate, lowering tax burdens for mostindividuals and adding an estimated $1.4 trillion to the federaldeficit over the next decade.

The vote Thursday represents a key milestone in President DonaldTrump’s quest to cut taxes for businesses and individuals -- thoughchallenges remain for the GOP’s far-reaching tax plans tofundamentally reshape aspects of the U.S. economy.

The Senate is debating its own separate plan, and itisn’t yet clear the chamber will have enough votes to pass it.

The Tax Cuts and Jobs Act H.R. 1, passed the House in a 227-205vote. Thirteen Republicans voted against it; all but one of themrepresent high-tax states that have the most to lose fromprovisions that would eliminate individual deductions for state andlocal income taxes.

“We are in a generation defining moment for our country,” HouseSpeaker Paul Ryan said from the House floor before the vote. “Whatwe’re doing here is not just determining the kind of tax code we’regoing to have -- what we are doing here is determining the kind ofcountry we’re going to have.”

“Under this plan, the average family at every income level getsa tax cut,” Ryan said.

Studies have shown that many of the tax bill’s benefits would goto the highest earners -- and some middle-class taxpayers mightactually pay more.

Ryan celebrated the vote total. “Getting 227 members to agree onsomething as complicated as the tax code is extraordinary,” hesaid.

Conservatives lauded Thursday’s vote -- a crucial step toward amuch-needed win for Republicans after almost a year of unifiedgovernment with no major legislative victories. The bill’s backerssay its cuts would spur enough economic growth to offset themeasure’s $1.4 trillion cost, as estimated by Congress’s JointCommittee on Taxation. The JCT hasn’t yet released cost estimatesthat would account for macroeconomic changes.

Focus now turns to the Senate, where Republican leaders willface tougher hurdles -- both political and fiscal.

Republicans control only 52 of the chamber’s 100 seats and mustproduce legislation that meets far stricter fiscal constraints. TheSenate Finance Committee is already proposing measures that wouldmake benefits for individuals -- including the middle class --temporary as leaders try to avoid adding to deficits beyond a10-year budget window.

Senate Majority Leader Mitch McConnell praised the House voteand said Senate tax writers “are also making real progress on abill that’s been years in the making to fulfill our promise to theAmerican people.”

The Senate plan departs from the House bill by delaying thecorporate tax-rate cut by one year. It also includes a proposal torepeal a key provision of the Obamacare law -- saving thegovernment $318 billion over 10 years to help pay for the tax cuts,but leaving 13 million Americans uninsured by 2027, according toofficial estimates.

Many of the Senate provisions are designed to cut the bill’scost and meet budget rules that will allow GOP leaders to pass abill with only Republican votes. Differences between the House andSenate legislation will have to be worked out between the chambers-- and then both the House and Senate will have to approve thefinal result.

House Ways and Means Chairman Kevin Brady, who shepherded thebill through the House, said lawmakers will persevere. “This iscertainly not the last step in our tax reform journey,” he saidafter the vote. But he pledged lawmakers will “make this betterevery step of the way.”

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