If you are a nonresident alien, you would file an IRS form 1040NR. TurboTax does not prepare those tax returns.
Please contact Sprintax who may be able to assist you in filing an IRS form 1040NR.
The filing requirements for IRS form 1040NR may be found here in the IRS form 1040NR Instructions on page 6.
You do not mention your visa status or whether you could qualify as a resident alien under the substantial presence test. You may post that here or contact Sprintax for direction.
Capital losses may be carried forward indefinitely until fully utilized or exhausted.
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