In twin rulings, the court found lawmakers were within their rights in 2007 when they repealed a "gain-sharing" benefit that paid employees more when investment returns on pension trust funds exceeded expectations, and in 2011 when they repealed automatic cost-of-living adjustments for certain retirees.
In each case, the Legislature had reserved the right to eliminate the benefits in the future, the court said, reversing two lower-court rulings.
"I don't think having to take away these benefits was something anyone enjoyed," said Sen. Barbara Bailey, an Oak Harbor Republican who chairs the Legislature's Select Committee on Pension Policy. "But had we not done this, or had it not been upheld, the cost to the state would have been in the billions."
Public-sector unions and others who sought to maintain the benefits concede they are pricey. But, they argued, the state had dangled the promise of the pension enhancements in the late '90s when officials persuaded tens of thousands of workers to give up their defined-benefit retirement plans for cheaper plans.
The cheaper plans reduced the defined benefits by half while adding a mix of defined contributions and gain-sharing, which occurred when investment returns exceeded 10 percent for four straight years.
James Oswald, a Seattle lawyer who represented state ferry worker Cheryl Costello and others who sued over repeal of the gain-sharing benefit, said that when the state Department of Retirement Systems provided written material encouraging workers to give up their more expensive plans, it never informed them gain-sharing could be repealed. The workers could not have known unless they had parsed the fine print of the statute creating the benefit, he said.
"Tens of thousands of employees gave up their benefits based on representations about what they'd receive," Oswald said. "They were never told that these benefits could be repealed, and that's very troubling to me. That's the kind of bait-and-switch the court would never permit a private employer to do."
The state conceded it never explicitly told the workers the benefit could be repealed. But the court said the provided materials could not be read as promising it would exist forever.
Furthermore, the materials contained a caveat: "If there are any conflicts between what is written in this handbook and what is contained in the law, the applicable law will govern."
"The gain-sharing statute explicitly stated that gain sharing may be repealed in the future," Chief Justice Barbara Madsen wrote for the court.
Bailey said paying for the benefits when times are good makes it tougher for the pension trust funds to weather economic downturns.
"That was the principle that was ignored when gain-sharing was first brought to the Legislature," she said. "Everybody was excited that the investments were doing well. It was one of those things that probably shouldn't have been done at all."
The Washington Education Association, which sued along with several of its members, said the rulings were especially hard on lower-paid bus drivers, cafeteria workers and custodians, but the pension cuts also make it tougher to keep good teachers in the classroom.
"Historically, teachers have made a decent salary, but we've had good retirement benefits and good health care. That's been eroding," said Jared Fink, an Everett teacher and plaintiff. "Gain-sharing made it attractive, and that gets taken away."
Oswald, who represented some of the plaintiffs, said that if the justices ruled for them, it would have built on the court's 2012 McCleary decision, which held that the state had not been meeting its constitutional duty to fully pay for basic education. The state has added $982 million in education spending over the next two years, but lawmakers have estimated that responding to the ruling will ultimately cost billions more.
"What the court is doing in McCleary is heroic and difficult, and it puts them at cross-purposes with the Legislature," Oswald said. "For the court to say, 'Here's another multibillion-dollar thing for you to do,' it would have been a singular act of courage."
State Attorney General Bob Ferguson said Washington has already paid the extra benefits that accrued before the repeals. If the lower court rulings had been allowed to stand, he said, it could have cost the state more than $10 billion over the next 25 years.
"Today's decisions preserve the rights of public employees to receive the basic pension benefits the Legislature has promised, but make clear that the Legislature has the flexibility to add temporary benefits without being locked into providing them forever," he said in a news release.
The cost-of-living adjustment at issue was approved in 1995. It provided for 3 percent annual increases in retirees' monthly retirement payments.
Associated Press writer Rachel La Corte in Olympia contributed to this report.