Doing those operations from an IRA brokerage account not only postpones or eliminates income taxes, but it also eliminates the need to make tons of tax returns. You can buy, sell, and buy back shares from your IRA as often as you like. If you are a day trader, you may want to enter and exit several stocks per day. If you have an IRA, you can use IRA funds to buy, sell, and buy back shares in your retirement account as often as you want in a day.
Using an IRA for trading can help you postpone paying taxes on profits earned from selling stocks and eliminates the need to file taxes. On the other side of the coin are tax losses. When you sell stocks at a loss in a taxable account, you can deduct losses from your profits and even from your regular income up to a limit. If you sell a stock within an IRA at a loss, you won't get that benefit.
Despite regulations, IRAs are quite similar to regular investment accounts in terms of the investments allowed in the account. If you can buy or sell stocks in a regular account, you can also buy or sell them in your IRA. Nothing in the rules of a standard Roth IRA prevents you from buying and selling stocks the same day. So, in that limited sense, you can perform day to day operations on a Roth IRA.
An IRA is a tax-advantaged retirement account, and this advantage applies to the tax status of your stock investments. However, there are other stocks, such as major limited liability companies (also called MLPs), as well as S companies and LLCs, with different rules that IRA investors should know. The IRS allows investors to buy and sell stocks in a traditional and Roth IRA as they would with a brokerage account. You cannot short sell shares in an IRA, since you must use it as collateral for the loan, which is a prohibited transaction.