Loan interest is still deductible on your tax return, even if your investment or business goes belly up. A little-known ‘loss of source’ rule permits you to keep writing off previously deductible interest expenses after the source is gone. Read the complete article here: https://business.financialpost.com/personal-finance/taxes/loan-interest-is-still-deductible-on-your-tax-return-even-if-your-investment-or-business-goes-belly-up