QB Issue Resolution:

Changing your worker’s compensation rate will also change the calculations for your old employees. Let me add a few details and help you further.

 

In QuickBooks, you can only edit the rate and the effective date for the calculation to be correct. This said it’ll apply directly to all your employees.

 

You can edit your rate again to trigger it. And once you’ve done this, you can run a sample payroll to check if it calculated correctly for your old employees.

 

You may read this article for more information: Washington Workers’ Compensation Setup and Calculations.

Resolution for Issue 'I changed my washington workers comp rate on 1/1/19. Now the system is charging the old rate on employees that were here prior to the change and the new rate on new hire how do I make the old rate inactive effective 1/1/19?' available: Yes (Solved).
Source: Intuit Community forum.

I changed my washington workers comp rate on 1/1/19. Now the system is charging the old rate on employees that were here prior to the change and the new rate on new hire how do I make the old rate inactive effective 1/1/19?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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