Only partially correct. Yes, it's after the filing deadline for 2023. The affidavit of support requires information from three tax returns, but a complete copy of only the latest is what is required. Yes, they prefer to have a Tax Return Transcript, but when not available, a complete copy will do nicely. Read what comes on both sides of the OR, you seem to have missed. A complete copy will include all schedules, W2 and 1099 forms. The proof on "income" is there, but they will accept that if you're willing to pay tax on it and sign an affidavit of support under penalty of perjury, you are telling the truth.