I have a question regarding paying the taxes on a signing bonus that was received. I received to bonus check and there were no taxes taken out of the check. My understanding is that this check is treated as Royalties and is taxed as regular income. My question is how do I pay the taxes now so I don't get a penalty if I wait till filing next year? Do I just file a quarterly estimated income with the IRS and send them a check? Any help would be appreciated.