nycn400

I have few questions Name Change after Citizenship and certified copies of the Name Change and Certificate of Naturalization.
 
1) Do we need to inform current Employer that my Name Changed? If yes, should I wait till after I update my SSN information first? Should I also wait till I got the new SSN first as the new name will be updated among all the federal and government agencies?
 
2) What about my Company? EIN/TIN? Also Deed of the properties I own?
 
3) Will there be any issues if I buy/sell my properties during this period? do I have to update the Deed before I sell my properties?
 
4) Tax for 2017 when file April 2018, is there anything I need to do for filing taxes? 
 
5) I read some posts from the web that we can get the certified copies of Name Change and Certificate of Naturalization. Where I can get it? at the county clerk office of the Oath Ceremony took place or at the county clerk of where I live or country clerk office where I took my citizenship interview?? anyone can share some experiences?
 
6) I see USCIS website saying we can obtain certified true copies of the certificate of naturalization. Anyone tried?
 
Thanks in advance