You will be a resident alien for 2018 tax year. As an F-1 visa holder, you are considered as a nonresident for five years from the first year you enter the US ( 2014-2018). However, since you have already used one year for nonresidency while on the J-1 visa, you can only use the remaining four years as a nonresident under the F-visa (2013-2017), you will be a resident in 2018 if you stay more than 183 days in the US.
If you have filed a Form 1040NR and needs to amend by submitting a Form 1040, please see steps below. Basically, you would need to submit both the Form 1040-X and form 1040NR together:
- Download the Form 1040-X from IRS website (see below). On the front page of Form 1040-X, enter your name, current address, and social security number (SSN) or IRS individual taxpayer identification number (ITIN)
- Do not enter any other information on page 1.
- Do not complete Parts I or II on page 2 of Form 1040X.
- Enter in Part III the reason why you are filing Form 1040X.
- Complete a new or corrected form 1040. You can use TurboTax to file.
- Across the top of the Form 1040, write “Amended”
- Attach the new or corrected return (Form 1040) to the back of Form 1040-X and submit to the IRS.
https://www.irs.gov/pub/irs-pdf/f1040x.pdf - form
https://www.irs.gov/pub/irs-pdf/i1040x.pdf - instructions
(See page 6 under Residents and Nonresidents)
