Lawmakers are expected to begin voting on the motion at 1900 GMT
The results of the vote will then be due around 15 minutes after the motion begins. But prior to that, Commons will sit down starting at 1300 GMT where Jeremy Corbyn will open a debate on the no confidence motion. Theresa May will also participate in the debate and it is expected to last all the way until the vote comes about in the evening.
Who is voting?
There are 650 MPs in total but 15 of them will not be sitting in for the vote later. The four speakers of the House do not get a vote and so do the four lawmakers who are helping to count the votes later. In addition, seven members of the Sinn Fein party will not sit for the motion later as well.
How many votes does May's government need to win?
Considering the tally above, the government needs 318 votes to secure victory. May does not have an outright majority but continues to receive the support from the DUP on this matter, so she is still expected to win. The only way May loses is if her own party members decide to vote against the government, i.e. shooting themselves in the foot.
But even if they do come out on top, Labour could still put forward another motion of no confidence at any point in time; though formalities suggest that it is unlikely to be soon unless the margin for this one is borderline.
What happens next?
If May wins, the government stays in office and things continue as they are. May will then proceed to hold cross-party talks in an attempt to find a way to win over parliament in a "Plan B" of her Brexit deal. More on that here.
But if she loses, there will be a period of 14 days in which any party can attempt to form a government. Failing which, an election will be the next step.
