Republicans Maintain Their House Majority: Here's What History Says Happens to Stocks When the GOP Controls the Lower House of Congress

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Few if any events in 2024 were more anticipated by Wall Street and investors than Election Day. Although not all legislation on Capitol Hill has bearing on the stock market, elected officials are ultimately responsible for shaping the fiscal policy that can directly impact the profit potential of corporate America.

Not too long after polls closed on Election Night, former President Donald Trump was declared America's president-elect by the Associated Press (AP), and Republicans were deemed to have reclaimed a majority of seats in the Senate. However, control of the House of Representatives, at the time, wasn't as clear.

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On Nov. 13, eight days after polls closed, AP officially announced that Republicans had won enough seats to maintain their majority in the lower house of Congress. With eight House seats still left to be called, as of the early evening on Nov. 14, the GOP holds 218 seats (the precise number needed to maintain a majority in the 435-seat House of Representatives), while Democrats hold 209 seats.

An American flag waving in front of the Capitol building in Washington, D.C.
Image source: Getty Images.

The GOP secures control of the lower house of Congress

Though Republicans now have a unified government -- i.e., they control both houses of Congress and the White House -- there are still uncertainties about what's to come for the U.S. economy and American businesses.

For example, Trump has proposed a tariff-heavy policy meant to encourage American-made production and make domestic goods more price-competitive with imported products. While tariffs would be expected to cap at up to 20% on imports, the incoming president has suggested levying a country-specific 60% tariff on imports from China, the world's No. 2 economy by gross domestic product (GDP).

While tariffs would, on paper, be expected to level the playing field for American businesses, they threaten to raise prices for consumers and have the potential to worsen already strained trade relations with China. It's also possible that America's allies would retaliate with import tariffs of their own on American-made goods.

Wall Street is likely also concerned about our country's rapidly rising national debt. Republican policy traditionally favors lowering tax rates for consumers and businesses, which runs the risk of further widening the deficit.

The closest thing to a certainty, with Donald Trump soon to be in the Oval Office and the GOP controlling the upper and lower houses of Congress, is that personal and corporate income tax hikes are off the table. Democratic Party presidential nominee Kamala Harris had proposed increasing the corporate income tax rate by 33%.