What tax is withheld on options that are turned to cash after company sale?

[EnriqueSonicBoom]

My company is going private.  All outstanding shares will turn to cash at deal close.  I have options that are due to vest over the next few years that will be accelerated as part of the deal.  Half of the options will turn to cash at close; then the other half a year after the deal closes.  What, if anything, can I expect to have withheld at the payout?  Thanks!

[Opus 17]

You should check with HR.  If the rules are the same as for bonuses, the flat rate is 25%.