All 650 MPs will be given an iPad Air 2 and a laptop after May's General Election, despite challenges raised by Labour's Cabinet Office shadow minister.
The House of Commons Commission revealed the plans, which will cost £200,000 a year, or £1m over the course of the next government's tenure.
The Commission's chairman, John Thurso, said that the money will be offset by £3m of savings through a reduction in printing costs over the next five years.
However, shadow Cabinet Office minister Chi Onwurah raised concerns about Parliament being locked into one tablet model from a single supplier.
"Locking some of the most powerful people in the country into a platform that most of my constituents can't afford seems like a mistake," she said, according to a report in the Daily Express.
"And that's without mentioning the tax avoidance issue. I'm pushing for a device-independent digital platform for Parliament."
Onwurah also questioned whether the Commission had considered any alternatives to iPads.
Thurso responded by saying that an independent assessment completed by the Parliamentary ICT department had found that using other tablet brands would mean a costly reworking of existing systems and infrastructure.
"Given the established nature of iOS in the Houses' IT service offering, access to parliamentary digital services on iPads is mature, offering greater access than on other mobile devices," he said.
"While all of these services could be provided on other devices and operating systems, currently this would incur further costs in order to deliver them."
He added that adopting a different tablet would require the retraining of Parliament's IT staff who are familiar with handling the remote security support for iOS devices.
Thurso also explained that the iPad Air 2 meets Parliament's requirements to have tablets that are secure, SIM-enabled and capable of supporting future upgrades.
"The Apple iPad Air 2 meets these requirements and is competitively priced when compared with similar models," he said.
Thurso noted that MPs wishing to use alternative devices can choose from a range of laptops, tablets and peripherals using an online catalogue financed by the Members Estimate Committee.
Some 2,000 civil servants have already been offered Apple laptops, and can also opt for an iPhone 5S, Xperia Z3 or HTC One M8 smartphone.
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