From midnight on Monday, Donald Trump’s tariffs on Mexico, Canada, and China came into effect. But what are they and what do they mean for the UK?

The second-time president claims the tariffs – taxes on goods imported into the US – will help reduce illegal migration and the smuggling of the synthetic opioid fentanyl to the US.

In a White House speech on Monday, Mr Trump confirmed 25% tariffs on goods from Mexico and Canada and the doubling of tariffs on Chinese imports – from 10% to 20%. Canadian energy will be levied at 10%, he added.

China responded immediately, with 15% taxes on food and agricultural products it sends to the US – worth around $21bn (£16.5bn).

Canadian Prime Minister Justin Trudeau also retaliated with extra tariffs worth $100bn (£78.7bn) over the next 21 days. Mexico has not yet announced any countermeasures.

Both Mexican President Claudia Sheinbaum and Mr Trudeau have promised extra troops at their US borders to combat illegal migration, in a bid to stop an all-out trade war with Mr Trump.

But he appears determined to go even further, targeting other countries, including those in the European Union, which he claims was created to “screw” the US.

Will Trump target UK with tariffs?

No new US tariffs have been announced on the UK.

And Prime Minister Sir Keir Starmer’s successful White House visit raised hopes Britain could avoid Mr Trump’s recent wave of them.

“I think there’s a very good chance that in the case of these two great, friendly countries, I think we could very well end up with a real trade deal where the tariffs wouldn’t be necessary. We’ll see,” the president told reporters afterwards.

Mr Trump is largely concerned with trade deficits – when you import more goods from another country than you send there in return.

The US does not have a trade deficit with Britain – so UK ministers have previously suggested this could be good news for avoiding new levies.

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But even if no tariffs are put on UK exports, consumers will still be impacted by the wider trade war.

Mr Trump’s Monday announcement sparked an immediate downturn in US and European stocks, with share prices for car manufacturers, including General Motors, which produces a lot of its trucks in Mexico, falling in particular.

Economists believe that tariffs will raise costs in the US, sparking a wave of inflation that will keep interest rates higher for longer. The US central bank, the Federal Reserve, is mandated to act to bring inflation down.

More expensive borrowing and costlier goods and services could bring about an economic downturn in the US, the world’s largest economy – and global movements could hit the UK.

Forecasts from the National Institute of Economic and Social Research (NIESR) predict lower UK economic growth due to higher global interest rates.

It estimates UK GDP (a measure of everything produced in the economy) could be between 2.5% and 3% lower over five years and 0.7% lower this year.

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Some economists argue, though, that the UK might not be hurt too badly – even if Mr Trump imposes tariffs on British goods.

The UK doesn’t send a lot of goods to the US, exporting its banking and consulting services to them instead, which do not tend to be subject to tariffs.

However, the Centre for Inclusive Trade Policy thinktank said a 20% across-the-board tariff, impacting the UK, could lead to a £22bn reduction in exports in the UK’s US exports, with the hardest-hit sectors including fishing and mining.

How will it impact US consumers?

Although the Trump administration said the 10% Canadian energy tariff will boost domestic energy production, there are likely to be wide-ranging negative consequences for the US consumer.

Economists argue supply chains will be disrupted and businesses will suffer increased costs – leading to an overall rise in prices.

Both Mexico and Canada rely heavily on their imports and exports, which make up around 70% of their Gross Domestic Products (GDPs), putting them at even greater risk from the new tariffs.

China only relies on trade for 37% of its economy, having made a concerted effort to ramp up domestic production, making it relatively less vulnerable.

Avocados – and other fruit and veg

The US imports between half and 60% of its fresh produce from Mexico – and 80% of its avocados, according to figures from the US Department of Agriculture.

Canada also supplies a lot of the US’s fruit and vegetables, which are mainly grown in greenhouses on the other side of the US border.

This means new tariffs will quickly be passed on to consumers in the form of higher prices.

The US still grows a considerable amount of its own produce, however, so the changes could boost domestic production.

But economists warn an overreliance on domestic goods will see those suppliers increase their prices too.

Petrol and oil prices

Oil and gas prices are likely to be impacted – as Canada provides around 60% of US crude oil imports and Mexico roughly 10%.

According to the US Energy Information Administration, the US received around 4.6 million barrels of oil a day from Canada last year – and 563,000 from Mexico.

Most US oil refineries are designed specifically to process Canadian products, which would make changing supply sources complex and costly.

Oil tariffs could see an increase in fuel prices of up to 50 cents (40p) a gallon, economists have predicted.

Cars and vehicle parts

The US car industry is a delicate mix of foreign and domestic manufacturers.

The supply chain is so complex that car parts and half-finished vehicles can sometimes cross the US-Mexico border several times before they are ready for the showroom.

If this continues, the parts will be taxed every time they move countries, which will lead to an even bigger increase in prices.

As a result, Gustavo Flores-Macias, public policy professor at Cornell University, says “the automobile sector, in particular, is likely to see considerable negative consequences”.

To mitigate this, General Motors has said it will try to rush through Mexican and Canadian exports – while brainstorming how to relocate manufacturing to the US.

Mr Trump said of this dilemma on Monday: “They’re going to have a tariff. So what they have to do is build their car plants, frankly, and other things in the United States, in which case they have no tariffs.”

Electronic goods

When Mr Trump imposed a 50% tariff on imported washing machines during his first term in 2018, prices suffered for years afterwards.

China produces a lot of the world’s consumer electronics – and smartphones and computers specifically – so tariffs are likely to have a similar effect on those devices.

The Biden administration tried to legislate to promote domestic production of semiconductors (microchips needed for all smart devices) – but for now, the US is still heavily reliant on China for its personal electronics.

This will mean an increase in prices for electronics consumers globally – unless tech companies can relocate their operations away from Beijing.

Boost for the steel industry

The sector that could actually benefit from the Trump tariffs is the steel and aluminium industry.

It has long been lobbying the US government to impose levies on foreign suppliers – claiming they are dominating the market and leaving domestic factories without enough business and at risk of closure.

Steel imports increasing in price could therefore promote domestic production – and possibly save some of the plants.

But when Mr Trump increased steel tariffs during his first term, prices also increased – which business leaders said forced them to pass on costs and left them struggling to complete construction projects on budget.