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Planning to invest in stock, age 16
Don't try individual stocks. If you have a job, any job, even one from mowing lawns, you can open a Roth IRA. If you are under 18 you will need your parents/guardian to setting up the account. You can put the an amount equal to your earned income into the Roth IRA, up to the annual maximum of $5500. There are advantages to a Roth IRA:  What happens if you are using your income to pay for your car, insurance, etc? You can get the money from your parents, grandparents. The only rule is that you can't invest more than you have earned. Act before Tax day (April 15th). You know what you made last year. If you open the account and make the contribution before April 15th it can count for last year, as long as you are clear with the broker/bank when you make the deposit.