The Prime Minister outlined her 12-point EU exit strategy in a major speech last month but, amid pressure from her own Tory MPs, also bowed to demands to formally present them in a White Paper to the House of Commons.
Speaking at Prime Minister's Questions this afternoon, Mrs May revealed the document will be delivered tomorrow – before MPs have their final vote on whether Article 50 should be triggered.
Tonight, the House of Commons will vote for the first time on the Government's proposed Article 50 Bill at the end of two days of debate.
If passed, the Bill will hand the Prime Minister parliamentary approval to trigger Article 50 and begin EU divorce talks.
The SNP have tabled a wrecking amendment to the Bill, which will be voted on tonight at its second reading.
Theresa May will publish her Brexit plans in a White Paper tomorrow
The question every MP must ask themselves as they go through the lobbies tonight is do they trust the British people?
Ahead of the crunch vote, Mrs May warned MPs: "This House has a very simple decision to take.
"We gave the right of judgement on this issue to the British people, they made their choice, they want to leave the EU, the question every member must ask themselves as they go through the lobbies tonight is do they trust the British people?"
If the Bill survives its second reading today, the proposed Article 50 legislation will return to the House of Commons for a final vote next week.
It will then go to the House of Lords for ratification.
Theresa May's 12 point Brexit plan
Mon, January 16, 2017
It's finally here!
1 of 7
Continued cooperation with the EU to tackle terrorism and international crime.
Labour have promised not to block Article 50 but leader Jeremy Corbyn could face a rebellion by up to 100 of his MPs.
The SNP and Liberal Democrats are almost certain to vote against it.
The Article 50 Bill has been presented to Parliament by Brexit Secretary David Davis following the recent Supreme Court ruling that denied Mrs May has the power to begin the Brexit process without the consent of MPs and peers.