Can I use my father's income proof for the last two years for visa or loan purposes despite the year of issue being old?

Yes, you can use your father's income proof from the last two years for visa or loan purposes, even if the documents are a bit old.

It's best to submit the most recent income documents available, such as the last two years' Income Tax Returns (ITRs). If more recent documents are not available, a notarized income affidavit may also be accepted. Make sure all documents are correctly notarized and accurately reflect your father's income to avoid issues during the application process.