Party leader Danielle Smith says she hopes the update will show the government is on the road to keeping its election commitment to balance the books.
The Tories had planned to run a deficit of $886 million this year, but that deficit has since ballooned to $3 billion.
Premier Alison Redford says the world economy has changed and her government will borrow to pay for roads, clinics and schools.
Smith says that's a broken promise.
Horner says the government is well-positioned to get loans and is keeping its election promise to not borrow money for day-to-day spending.