OTTAWA — Ontario's controversial move to harmonize sales taxes will be part of a new $1.6-million government ad campaign that's poised to hit the newsstands on Thursday.

The print ads, which highlight an income tax cut that took effect Jan. 1, will invite readers to "take a closer look at Ontario's new tax package" by visiting a government website.

More than 400,000 people have visited the website, which will help residents figure out how the tax changes will affect them and their businesses, Revenue Minister John Wilkinson said Monday in announcing the campaign.

"This is the largest tax reform in over 40 years," he said during a Liberal caucus retreat in downtown Ottawa.

"So it's really important for people to make sure that there's a source of information that they can go to get the facts."

There is "misinformation out there" about harmonizing the eight per cent provincial sales tax with the five per cent federal GST next July, Wilkinson added.

Ontario's opposition parties are bitterly opposed to the HST, saying it will kick people who are already struggling during the economic downturn.

Tax harmonization will increase the cost of many items that were previously exempt from the provincial levy, from gasoline to Internet bills, haircuts and real estate fees.

Wilkinson said the ads were approved by auditor general Jim McCarter, ending months of speculation that the Liberals might opt to pay for the ads with party funds to circumvent Ontario's strict rules on government advertising.

The Liberals put the rules in place after taking office in 2003 to curb what they described as abuse of taxpayers' money on partisan ads by the previous Conservative government.

"We've been working very closely with his office to ensure that the ads meet both the intent and the spirit of the laws, and so we're very proud of them," Wilkinson said.

Apart from a magnifying glass that draws attention to the tax cut, the ad contains little imagery or information on the tax changes that passed in the legislature in December.

"Visit ontario.ca/taxchange to see how the personal income tax changes affect you," the ad states. "And find out more about all of the tax changes including the harmonized sales tax (HST)."

There are no plans yet to expand the ad campaign to television and radio spots, Wilkinson said.

Like Ontario, British Columbia will also harmonize its PST with the GST on July 1, something Quebec, New Brunswick, Nova Scotia and Newfoundland and Labrador have already done.

Federal Finance Minister Jim Flaherty, who has long advocated for tax harmonization, agreed to kick in $4.3 billion to Ontario and $1.6 billion to B.C. in a deal struck earlier this year.

Much of the federal cash going to Ontario will be used to fund government cheques of up to $1,000 for families and $300 for individuals in the first year of the HST to offset the pain.