The pricey German cars add extra charge to allay Brexit fears.

Porsche has become the latest carmaker to join the chorus of concerns regarding Brexit.

The German manufacturer of sports and luxury cars has warned that customers may have to pay an extra 10 percent on top of the price of all of its cars after Britain leaves the EU, according to the BBC.

2020 Porsche 911 Carrera 4S

In fact, in a 'precautionary' move, it is reportedly already started asking customers to sign contracts agreeing to the additional cost, although those that have put their pre-orders in before January 17 will be unaffected by the charge.

"As one potential outcome of the Brexit negotiations, there is a possibility that a duty of up to 10% may be applied to cars imported into the UK by us after March 29," Porsche said in an email to the BBC. "In light of this, we have chosen to inform customers whose cars are likely to arrive after Brexit occurs to warn them that they may be affected by this tariff – allowing them to be fully informed at the point of sale and, if they wish, to adjust their order accordingly."

"This is a precautionary step in the interests of allowing our customers to plan ahead."

2019 Porsche 718 Boxster T Rear

The tariff will up the cost of an entry-level 911 Carrera 2 from around £93,000 to over £102,000, while it will also push its 'cheaper' offerings – the entry-level Boxster and Macan – to over £50,000.

Porsche is of course part of the Volkswagen Group's expansive portfolio which also includes mainstream brands Volkswagen, Seat, and Skoda, as well as premium brands Audi, Bentley, Bugatti, and Lamborghini, but it is not yet known if a similar tariff will be applied to products from the other brands.

2019 Porsche Macan S face lift

"We are keeping a very close eye on developments and reviewing the entire spectrum of possible effects," a Volkswagen spokesman told the BBC. "We are noting with regret that there is currently a stand-still regarding the decision on the negotiated deal. For us, this means a further period of insecurity and planning uncertainty."

"We continue to prepare for all eventualities," the spokesman added. "Irrespective of this, the United Kingdom will remain an important market for the Volkswagen Group, the second largest in Europe."

Nearly five percent of Porsche's 2018 output of 256,000 cars was sold in Britain last year.

Gallery: 2020 Porsche 911 Carrera 4S: First Drive