By Al Yoon 

Illinois sold $1 billion in general obligation bonds, paying less to borrow than they did in a similar sale in June, a sign that the state's efforts to close a gaping pension gap are drawing back investors.

The sale is the first general-obligation offering since Illinois lawmakers reached an agreement in December that would close the state's pension gap by nearly $100 billion.

Illinois sold the bonds with an average interest rate of 4.46%, down from 5.05% when it sold $1.3 billion of tax-exempt debt in June, a state spokesman said. Underwriters lowered yields from preliminary levels, cutting 10-year notes rates by 0.06 percentage point to 3.81%.

"It sure looks like plenty of investors have gotten comfortable with the credit now," said Duane McAllister, a portfolio manager at BMO Global Asset Management, which bought some of the deal.

Yield premiums on Illinois' debt have plunged since Gov. Pat Quinn signed the pension-reform agreement, easing pressure on the state, which has $28.3 billion in general obligation debt. The lower rate will save the state $60 million in interest payments during the 25-year deal, whose proceeds pay for roads, bridges, schools and mass transit programs, the spokesman said.

Even so, Illinois' borrowing costs are still the highest among U.S. states, reflecting lingering uncertainty over its ability to carry out reforms and boost revenue. Investors demand 0.84 percentage point more to buy Illinois 10-year debt over California issues, according to Thomson Reuters Municipal Market Data.

Investors said Illinois' deal was also supported by a broader recovery in the municipal bond market, which in 2013 endured its worst year for total return 1994. Bond funds saw $63.5 billion in redemptions last year as Detroit's record bankruptcy filing and Puerto Rico's fiscal problems thrust the impact of pension costs into the spotlight.

Much of the recent price gains have been due to a lack of new debt issuance. In January, municipalities issued $18 billion, 30% lower than a year earlier, according to Christopher Mauro, a strategist at RBC Capital Markets who predicted annual issuance will also decline this year.

Despite investors' response to Illinois' pension reform, Moody's Investors Service and Fitch Ratings have kept their negative outlooks on the state. Reforms face stiff opposition from union groups including We Are One Illinois, which last month sued to stop the "pension theft" law that it says violates the state's constitution.

"If upheld by the courts, the law will be positive for the state," Moody's said in a report on the new issue. But it added that "the legal process may invalidate the reform altogether, or reject pieces of it."

Rating firms also warn that revenue will drop if the state allows a temporary tax increase to expire next year.

Kathy Bramlage, a director at Treasury Partners, a unit of financial-advisory firm HighTower Advisors, said Illinois probably benefited more from the lack of new issuance than investors taking fresh bets on the credit. "But even if it is the weakest state credit, it has some fairly attractive yields so this is something that gets attention," she added.

Write to Al Yoon at albert.yoon@wsj.com

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