Different companies may adopt different approaches/policies. And different TUBs may have different implications when retro. For example, unempoyment tax rate change and withholding tax changes are different.
Personnally, I would suggest force retro calc (only current year) so that payroll can assess the impact centrally and communicate with employees ahead of time. Otherwise, Employees will see unexpect results when master data changes cause retro in different payroll period. And in some case and states, companies can not just retro calc and take more retro taxes without employee's consent. In those cases/states, companies will have to either get the consent from employee or have to come out a process not to take more taxes and adjust YTD tax balance accordingly.
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