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Using Loan to Invest - Paying Monthly Installments by Selling Originally Bought Shares
I will add one point missing from the answers by CQM and THEAO. When you take a loan and invest the proceeds, the interest that you pay on the loan is deductible on Schedule A, Line 14 of your Federal income tax return under the category of Investment Interest Expense.  If the  interest expense is larger than all your investment earnings (not just those from the loan proceeds), then you can deduct at most the amount of the earnings, and carry over the excess investment interest paid this year for deduction  against investment earnings in future years. Also, if some of the earnings are long-term capital gains and you choose to deduct the corresponding investment interest expense, then those capital gains are taxed as ordinary income instead of at the favored LTCG rate. You also have the option of choosing to deduct only that amount of interest that offsets dividend (and short-term capital gain) income that is taxed at ordinary rates, pay tax at the LTCG rate on the capital gains, and carry over rest of the interest for deduction in future years. In previous years when the tax laws called for  reduction in the Schedule A deductions for high-income earners, this investment interest expense was exempt from the reduction. Whether future tax laws will allow this exemption depends on Congress. So, this should be taken into account when dealing with the taxes issue in deciding whether to take a loan to invest in the stock market.