Business Insider is reporting that Article 50 will be triggered at 12.30pm on Wednesday, just 48 hours from now.
Prime Minister Theresa May has written a letter to President of the European Council Donald Tusk, which will be handed to him by the UK Permanent Secretary to the EU.
At the same time, May will make a statement in the House of Commons. The letter will then be released to Parliament once her statement has been made.
What follows is up to two years of negotiation between the UK and EU member states.
Investment and currency markets dislike uncertainty, so during this negotiation period we might experience more volatility than usual.
What investors should keep in mind during the days, weeks and months following the start of this Brexit process is that short-term volatility is the price you pay for long-term returns.
The notification will take the form of a letter addressed to Donald Tusk, President of the European Council.