The flaws of these

The flaws of these questionable tax shelters are usually that transactions were not reported at fair market value or the interest rate was too high or too low. In general, if the purpose of a transaction is to lower tax liabilities but otherwise have no economic value, and especially when arranged between related parties, such transactions are often viewed as unethical. The agency may re-evaluate the price, and will quickly neutralize any over tax benefits. However, such cases are difficult to prove. A soft drink from a vending machine can cost $1.00, but may also be bought in bulk for $0.25. To prove that the price is in fact unreasonable may turn out to be reasonably difficult itself.