There is a temporary worker from Fulton county, GA came by himself to South LA to work on a poject to rebuild Louisiana. He lived in Jefferson Parish a short while.(4 months,7months or 12 months what ever) However, this worker has family in Fulton and he returned to Fulton after finished the project. Questions: 1. When he filed income tax to IRS, should he put address in 1040 Form as Fulton? 2. Will it make the difference to for the filing if he stayed in LA for 4 months, 7 Months, or 12 Months? (about IRS, not state tax) 3. If he stayed a long time (over 12 months), should he register as the voter in Jefferson Parish. 4. If he registered as Jefferson Parish voter and he file jointly with his wife if Fulton, should the address in 1040 be in Fulton or Jefferson? If anyone can answer the above questions or just give me a clue where I can find the sources about the above situations , I will appreciate it a lot!