I am a US citizen living/working abroad. What form am I to fill out?

[Critter]

You use the form 1040 ....   

https://www.irs.gov/Individuals/International-Taxpayers/U.S.-Citizens-and-Resident-Aliens-Abroad---F...

If you do not have a IRS W-2 from a foreign company then you do not enter the form you received in the W-2 section.  You enter the income as Foreign Earned Income.

·         Click on Federal Taxes

·         Click on Wages and Income

·         Click on I'll choose what I work on

·         Scroll down to Less Common Income

·         On Foreign Earned Income and Exclusion, click the start or update button

See this TurboTax support FAQ - https://ttlc.intuit.com/questions/1895445-how-do-i-report-foreign-income

[taylorjak]

Can I still use my parents address in the U.S.A.? Which is still my current mailing address?

[Critter]

Yes you can.