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Why is the breakdown of a loan repayment into principal and interest of any importance?
It's important because you may be able to reduce the total amount of interest paid (by paying the loan faster); but you can do nothing to reduce the total of your principal repayments. The distinction can also affect the amount of tax you have to pay. Some kinds of interest payments can be counted as business expenses, which means that they reduce the amount of income you have to pay tax on. But this is not generally the case for money used to repay the loan principal.