For U.S. tax purpose, you must follow the expatriate tax rules/compliance. Also read up the heart tax rule. Start here for U.S. Tax purpose assuming you have worked out/ initiated the process/ the details with the State Department process:
Then, if you need assistance with form 8854 to attach to your final 1040 or any other U.S. tax or foreign financial filing requirements, connect with info@whinglobal.
Here is the state department guidance/web link for us citizens living abroad: https://travel.state.gov/content/travel/en/legal/travel-legal-considerations/us-citizenship/Renunciation-US-Nationality-Abroad.html
