Pay for PerformanceVariable pay plans can save you money--and your employees may prefer them.

When David Hayes offered employees the chance to take lower salaries in exchange for potentially higher bonuses based on performance, he wasn't sure how they'd take it. But when 75 percent of the eligible workers at Skyline Construction in San Francisco opted for the lowest salary combined with the highest bonus, Hayes had his answer. "It was incredibly well-received," says the 44-year-old founder and CEO. It helped Skyline, too: After two years, sales had climbed from $36 million to $71 million, while costs as a percentage of sales shrank. This year, the company projects sales of more than $100 million.

Pay for performance is a growing phenomenon, according to a Hewitt Associates study that found employee pay raises inching up an average of 3.8 percent in 2008, maintaining the tepid growth of the last few years. Bonuses based on performance, meanwhile, were set to hit a record high this year of 12 percent, as a percentage of payroll, up from 8.8 percent in 2003. Ninety percent of companies offer at least one broad-based variable pay plan, Hewitt found, up from 80 percent in 2006 and 51 percent in 1991.