Interest on a HELOC for your personal residence doesn't qualify for a deduction unless it was used to build an addition to the home. if it was, further requirements are that the loan must be secured by the taxpayer's home, not exceed the cost of the home and when combined with other acquisition indebtedness, not exceed the overall limitation on acquisition indebtedness.
if it meets these tests you would have to amend prior year returns. There may be other situations whereby the interest is deductible so we would need to know what the proceeds were used for to provide an answer.
