THE U.S. decision to impose a 15 percent global tariff has cast more confusion and uncertainty for businesses and consumers, according to financial analysts.

U.S. Supreme Court ruled Friday morning in a 6-3 vote that U.S. President Donald Trump's tariff policy under the International Emergency Economic Powers Act was illegal.

Infuriated by the ruling, Trump signed an order imposing a 10 percent tariff on imports from all countries hours later. Then on Saturday he said that he will raise the new global tariff to 15 percent.

The White House said the new levy is being imposed to address "fundamental international payment problems," adding that it will stay in effect for 150 days under a section of the Trade Act of 1974.

Certain products will be exempt from that levy - including some critical minerals, beef and tomatoes. The Trump administration also said it's considering other legal avenues to impose duties.

While the Supreme Court deemed many of Trump's tariffs illegal, it did not specify a means to pursue refunds, instead leaving that issue to lower courts. That could mean protracted legal wrangling for years for U.S. importers and uncertainty over if and how consumers will see any benefit.

"I would caution consumers, business owners, from assuming that this is going to have an immediate benefit, that this is going to cause immediate lower prices. That isn't likely. What this really does is, again, cause a lot more uncertainty，" said Stephen Kates, senior financial analyst with Bankrate, a consumer financial services company based in New York City.