You are required by law to file a US tax return. You have an obligation to prove the submitted return to the visa sponsor. Use the possibility of retroactive submission only from 2019, earlier after consultation.
File a tax return for everyone who worked in the US You can receive a refund for overpayments to a US bank account or by check to a postal address Adhere to the deadline for additional tax payment (until 15.4. ). Don’t leave everything to the last minute. By meeting the deadline, you will avoid delays in the process or penalties and fines