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Using Loan to Invest - Paying Monthly Installments with Monthly Income
Here are my re-run figures.  Not counting capital gains taxes, I calculate you need to be making 1.875% per annum or 0.155% per month on your $8,000 investment to break-even on the loan.  It's interesting that the return you need to gain to break-even is less than the interest you're paying, even with commission.  It happens because the investment is gaining a return on an increasing amount while the load is accruing interest on a decreasing amount.    Ref. r, logarithmic return