Colorado Public Employees Retirement Association, Denver, will begin offering its 401(k) plan participants a matching contribution in January 2001, when officials anticipate the $25 billion defined benefit plan will be fully funded, said Carole Wright, a PERA trustee, this week at the Pensions & Investments defined contribution conference in San Francisco. Colorado is only one of about 10 states with a 401(k) plan, Ms. Wright said. PERA officials had struck a deal with state officials that when the defined benefit plan is fully funded, PERA, which administers both plans, could reduce employers contributions by one percentage point and use that money to supply a 401(k) match, she said. The match would vary. For example, in the first year, municipal employees could expect a matching contribution of between 1 1/4% and 1 1/2% of pay, she said. Judicial employees may expect a match of about 5.5% of pay.