The main concern is the iPhone, though. It accounted for 63 per cent of sales in 2018, and serves as a hub for additional revenue from services and related devices like the Apple Watch. The newest iPhones cost US$750 ($1143) to US$1,450, so any price increases could take the devices beyond the budgets of more consumers.
Apple shares slumped last week as the trade war flared up. The stock rose 1.1 per cent on Wednesday.
The heightened trade tensions are a test for Cook and the global supply chain he helped build and run. Last year, the CEO showed political prowess by meeting with US President Donald Trump to argue against tariffs.
Just over a year ago, Cook met Trump in the Oval Office. The CEO said he opposed the president's approach and focused on how cooperation between countries can boost the economy more than nations acting alone. After the meeting, the administration told Cook it would not place tariffs on iPhones, The New York Times reported.
Apple also wrote to US Trade Representative Robert Lighthizer in September asking him to reconsider tariffs and instead take other measures that would support the US economy and American consumers. Later that month, the White House spared Apple's Watch and AirPods.
By late 2018, Apple's strategy had become less effective. In late November, Trump told the Wall Street Journal he might impose tariffs on mobile phones and laptops, and said consumers "could stand" a 10 per cent increase in prices "very easily." The day after, Cook toured schools in Idaho with Ivanka Trump, the president's daughter and senior adviser.
As 2019 began, the real cost of the trade war for Apple began to emerge. The company cut revenue projections and Cook said the Trump administration's trade policies had indirectly hurt consumer demand for iPhones in China.
More recently, the company has raised prices when it refreshed products that have already been hit with tariffs. The updated Apple Pencil, launched in October, costs US$30 more than the previous version. The faster Mac mini costs US$300 more than its predecessor.
That suggests the company may take a similar approach with the iPhone. In its September letter to Lighthizer, Apple said tariffs would increase product prices.
The 25 per cent tariff on iPhones would likely apply to the wholesale price of the devices when they are imported from China. Apple doesn't disclose wholesale prices, but research firms often estimate the bill of materials.
A US$1,249 iPhone XS Max with 256 gigabytes of storage has US$453 worth of parts, according to TechInsights. A 25 per cent levy on that would be US$113, raising the purchase price by about 9 per cent. Apple's other models, the iPhone XS and the iPhone XR, could face a similar increase, according to estimates. In a recent note to investors, Morgan Stanley estimated that a US$999 iPhone XS would cost US$160 more. JPMorgan analysts forecast a 14 per cent price increase.
This may only apply to US iPhone sales, limiting the damage. About a third of iPhone revenue comes from the US, according to Shannon Cross of Cross Research.
That won't address the problem of even more expensive iPhones, though. A series of price increases in recent years has already coincided with declining sales. If Apple passes the whole tariff cost to US consumers, demand could drop by 10 per cent to 40 per cent, Cowen's Sankar estimated on Tuesday. That, in turn, may slice earnings per share by 1 per cent to 4 per cent in fiscal 2020, the analyst said.
Alternatively, Apple could eat the cost and leave iPhone prices untouched. That would dent earnings per share by 6 per cent to 7 per cent, based on a US$450-per-device import cost and annual US unit sales of 40 million, according to Sankar.
Still, Apple has experience absorbing extra costs. When currencies swing, the company manages to protect its gross profit margins, Cross noted.
Apple could work around the tariff issue as well. There's a possibility of Apple re-jiggering its supply chain to build more products outside China. Apple is ramping up production in India to avoid local taxes and has done similar work with Foxconn in Brazil.