It depends. Interest on a loan used for personal purposes is not deductible. Interest on a home equity loan, however, is deductible regardless of what you use the proceeds for. In order for a loan to be treated as a home equity loan, it must be secured by your residence. If you arrange the loan with the corporation so that the loan is secured by the residence, then interest would be deductible as a home equity loan. The limit on home equity debt for a married couple filing jointly is $100,000.
The tax on the investment income in excess of $1,700 (may change after 2007) of a child under age 18, based on the parents’ marginal tax rate and computed on Form 8615.