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If you have no contract with them, they are at will
employees and you need no reason to terminate them. You will need to pay unemployment
and they have the right to file unemployment in CA if that is where you were paying their unemployment. If they were remote employees working for your CA company, you would not have a problem with not being registered in IN, but you do have to make unemployment in CA available to them
The standard separation agreement would include a clause that states they "release you from all claims that legally may be waived, including but not limited to claims under the ADA
, Age Discrimination
in Employment Act, Older Workers Benefit Protection Act, ERISA
, Title VII
and any other statutory claim that the law allows the employee to waive, known to the employee at the time of signing this agreement and also unknown to the employee."
That would go in your severance agreement. They cannot waive unemployment, so you need to assist them in filing their claims with CA Unemployment as interstate claims.