Tax equalization

My job is "encouraging" me to give them approval to handle my tax filing.  As my job requires for me to work oversea for extended periods of time, I am being told this would be beneficial to me.  I guess this is called 'tax equalization'.  Trying to Google tax equalization is not helping me to make the decision to give approval.  Appreciate if someone can answer the following on tax equalization? 

 

What is tax equalization? 

What is its benefit? 

What is its negativity?

Is it beneficial to me?  If yes or no, why would it be beneficial or not beneficial to me? 

 

Thanking you in advance for your help.