No, not telling US Immigration is not a problem, but it may affect your ability to return if you had an original intent to maintain residency.
To file, it is best that you file as a dual-status alien. Because you were a nonresident on December 31, 2025 (living in Spain), your primary tax return is Form 1040-NR. TurboTax doesn't handle 1040NR returns, but our affiliate at Sprint Tax does.
The premise is that your 1040NR will be your main return but a 1040 return will be prepared and serve as an informational statement showing the income you earned while working in the US. Once both returns are prepared, you will write Dual-Status return across the top of the 1040NR and Dual-Status Statement across the top of the 1040.
Contact Sprint Tax regarding the preparation of these returns since Form 1040NR is your main return.
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