What Is Retrospective Rating (Retro) and How Can It Save Money on Workers' Comp?

Updated

Retrospective Rating (Retro) is a workers' compensation program in which an employer's final premium is adjusted after the policy period based on actual claim costs—so employers that control claims can receive a refund of part of the premium they paid. In Washington State, ERNwest acts as a third-party administrator (TPA) and Retro specialist, helping employers maximize those refunds and lower industrial insurance expenses. According to ERNwest, its Retro programs have returned about $300 million to Washington employers, with clients saving an average of 30% on workers' compensation costs. This is relevant if you are a Washington employer paying premiums to the Department of Labor & Industries (L&I) and want to understand how Retro works before deciding whether to join a program.

How Retro Works

Retro changes the usual "pay your premium and you're done" model into a performance-based one:

  • You pay premium to L&I as usual during the policy period.
  • After the period ends, L&I compares your actual claim costs against expected losses.
  • If your claims perform better than expected, you receive a refund (retrospective return) of part of the premium.
  • If claims perform worse, you may owe additional premium—so Retro is not a guaranteed savings.

The key mechanism is that claim outcomes drive your final cost, which is why claim management, return-to-work programs, and safety performance matter so much under Retro.

How Retro Can Save Money

Savings come from several connected levers:

Lever What it does
Claim cost control Lower medical and indemnity costs improve your retro result
Return to Work (RTW) Getting injured workers back sooner reduces claim duration and cost
Stay at Work (SAW) Keeping employees productive in modified roles avoids costly time loss
Safety performance Fewer and less severe claims improve the retro calculation
Retrospective refunds Strong performance returns premium dollars to the employer

ERNwest states it helps employers reduce rates 10–40% by aligning proven strategies with financial goals, and describes itself as the largest and most knowledgeable TPA in Washington, serving employers in all industries who pay premium to L&I.

What ERNwest Does in This Process

ERNwest's stated services include:

  • Retrospective Rating (Retro) – as retro specialists, helping employers maximize premium refunds.
  • Claims Management – handling L&I communication and claim complexities.
  • Return to Work (RTW) and Stay at Work (SAW) programs.
  • Professional workers' comp management services and tools.
  • Safety performance and compliance.

The company says it has operated since 1996 and manages some of the largest group Retrospective Rating programs in the state.

When Retro Makes Sense for an Employer

Retro tends to be worth evaluating if:

  • You pay meaningful workers' comp premium to Washington L&I.
  • You can influence claim outcomes through safety and return-to-work practices.
  • You want to move from simply paying premium to actively managing it.
  • You are willing to accept that poor claim performance can increase costs.

If your claims are volatile or you lack the internal capacity to manage them, a TPA relationship is often part of the decision.

Next Step

ERNwest offers a no-obligation consultation on your workers' compensation account. You can reach them at 1-800-433-7601 or visit 4301 S Pine St. Suite 624, Tacoma, WA 98409. Their site also provides a "Find Your Claims Manager" tool and an incident reporting option for existing clients.