Is there any chance I can apply for Ireland by showing other documents instead of ITRs since my father won't file any ITRs?

Yes, you can apply for your Irish visa even without your father's Income Tax Returns, because the Irish Visa Office wants clear proof of funds, not one specific document. Since a missing ITR raises scrutiny, you need to submit a strong, well-explained set of alternative papers in its place.

Alternative Documents That Can Replace an ITR

Rules to Avoid a Visa Refusal

• Write a signed explanatory letter or affidavit stating clearly why your father does not file ITRs, such as income below the taxable bracket or tax-exempt agricultural earnings.
• Explain any single deposit above roughly Rs. 50,000 made in the last six months with a receipt or written note.
• Make sure every letter from an employer or bank is on official letterhead with a landline number and company email address, since informal Gmail or Yahoo addresses are not accepted.

My Advice

Start by securing an education loan sanction letter if you can, since it does the most work in place of a missing ITR, and pair it with six months of clean bank statements plus a chartered accountant's net worth certificate. Write out your father's income situation honestly in your cover letter rather than leaving the gap unexplained, since a clear story is what visa officers are really looking for.