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How to buy stuff (stocks?) in IRA account? What else?
You can buy stocks in the IRA, similarly to your regular investment account. Generally, when you open an account with a retail provider like TDAmeritrade, all the options available for you on that account are allowable. Keep in mind that you cannot just deposit money to IRA. There's a limit on how much you can deposit a year ($5500 as of 2015, $6500 for those 50 or older), and there's also a limit on top of that - the amount you deposit into an IRA cannot be more than your total earned income (i.e. income from work). In addition, there are limits on how much of your contribution you can deduct (depending on your income and whether you/your spouse have an employer-sponsored retirement plan).