First Minister Nicola Sturgeon said Thursday she would publish draft proposals for a new national ballot.
She told the annual conference of her ruling Scottish National Party that she wanted the bill in place to give her the possibility of calling another referendum before Britain is expected to formally leave the EU in March 2019.
Scots rejected independence by 55 to 45 percent in 2014, and opinion polls suggest there is still no clear majority in favor of a split.
More from NBC News:
Brakes on train in deadly Hoboken crash were working: NTSB Report
Elizabeth Warren goes on Twitter tirade after Wells Fargo CEO retires
Miss USA Contestant details unwanted encounters With Trump