A little more on the Conservatives TFSA;

Conservative Leader Stephen Harper is promising to double the annual contribution cap for tax-free savings accounts after the budget is balanced.

Harper made the announcement in Vaughan, Ont., where he is spending a second day campaigning in the vote-rich Greater Toronto Area.

The Conservative government announced the tax-free savings accounts in 2008, which allows Canadians 18 and older to invest up to $5,000 annually. Harper said he would double that annual amount to $10,000 if he is re-elected.

"The tax-free savings accounts have been a tremendous success. Just about five million Canadians now have a tax-free savings account … but we can all do more," Harper said.

The changes wouldn't take effect until after the budget is balanced, which is expected around 2015, according to current projections.

But Liberal Leader Michael Ignatieff scoffed at the timeline Harper set to introduce the measure.

"I mean, what is this? A tax-free savings account in five years when rainwater is beer, when pigs fly," Ignatieff said at a Liberal campaign stop on Thursday.

Currently, Canadians who do not save the maximum $5,000 each year can carry forward the balance forward to future tax years.

It is estimated that more than 4.7 million Canadians have put money into these accounts, creating a market value of $17.9 billion.

Harper said Canadians use the money put into the special accounts for various reasons, such as saving for home renovations or retirement.