Aston Martin has authorized up to 30 million pounds ($40 million) worth of contingencies including flying in components if parts from mainland Europe are held up ports.
British lawmakers will vote on whether to delay Brexit on March 14, just over two weeks before the scheduled departure date.
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Adjusted pre-tax profits fell 7 percent to 68 million pounds ($90 million) before one-off costs related to its initial public offering.
The company said that if some one-time pension-related credits were stripped out of 2017’s figures, adjusted pre-tax profit would have risen in 2018.
Britain’s once-soaring car industry is now recording falling sales, investment and production, with Honda delivering the most serious blow earlier this month, announcing the closure of its British factory.