From CTV News, the Canadian Federation of Nurses Unions has announced that it will be registering as a third-party advertiser ahead of the upcoming federal election: http://www.ctvnews.ca/politics/nurses-running-political-ads-this-election-season-for-first-time-ever-1.2368296
Registration as a third party advertiser is required for organizations such as the Canadian Federation of Nurses Unions to run advertising during an election campaign that promotes or opposes a political party or candidate, or an issue on which a political party or candidate is associated.
As a registered third party, there is a limit on how much the Canadian Federation of Nurses Unions will be allowed to spend on election advertising during the campaign period in total, as well as to promote or oppose candidates in any particular electoral district.
Pursuant to section 350 of the Election Act (Canada), the spending limit for third parties for a 37-day election campaign is $150,000 in total and $3,000 per electoral district. These totals are multiplied by an inflation adjustment factor, and an increase is made in case of a campaign period longer than 37 days.
According to Elections Canada (http://elections.ca/content.aspx?section=pol&document=index&dir=thi/limits&lang=e), the inflation adjustment factor in effect from April 1, 2015 to March 31, 2016 is 1.372. This means that the general limit for a 37-day election period is $205,800 and the per electoral district limit is $4,116.
If the election period is longer than 37 days, the total limit will be increased by $5,562.16 per day, and the per electoral district will be increased by $111.24 per day.