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You should receive a Form 1098 from the lender after the end of the tax year showing how much interest you paid on the Home Equity Line of Credit (HELOC). You may deduct home equity debt interest, as an itemized deduction, if all the following conditions apply:
The HELOC is considered by the IRS to be a second mortgage on a home. Any mortgage that is placed on a home that is not the primary mortgage or loan taken out in order to purchase, build or reconstruct the home is considered to be a second mortgage. Limitations that exist include that the individual cannot deduct more than $100,000 in interest per year. If a couple is married but filing separately, the individuals, on their own, may not deduct more than $50,000 each.
Interest paid on home equity debt is an adjustment for the Alternative Minimum Tax (AMT). You can figure the AMT adjustment for home equity debt using the Home Mortgage Interest Adjustment Worksheet on page 2 of the Instructions for Form 6251.
For more information, see Publication 936 (2008), Home Mortgage Interest Deduction
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