>> well I would have paid tax anyway if I just saved it
The point is that as long as your money is in the IRA you can earn interest or buy stocks, sell for a profit, over and over and not pay any taxes on your gains in between.
Imagine you have $100k in a normal trading account and $100k in an IRA. You make the same trades in both and both are up $20k at the end of the year. Let's say then you want to trade out and take profit. The normal account triggers taxes on $20k worth of capital gains, so maybe it now has $115k in it. The IRA doesn't, so it still has $120k in it. Go ten years like that. At the end when you withdraw from the IRA, yes you have to pay taxes on the total gains (if it's not a Roth) BUT you had the use of that extra $5k every year you didn't pay taxes on! The whole time, all that tax money you didn't pay compounds to let you make more money with it. That's the concept. You're allowed to keep using the money that you would've otherwise had to give to the government, to make more money along the way. The final 20% you pay when you cash out is less than how much you made by compounding the tax savings and plowing them back into investments.
I think you're missing the point of IRAs too. The primary point of IRAs is that you can defer taxes from a time when you have high taxes (your working years), to a period of when you can have low taxes (retirement). That's it. Being able to trade stocks within an IRA is a side benefit. Another side benefit is no taxes on things like dividends inside your IRA. Those are not the primary benefit.
>> well I would have paid tax anyway if I just saved it
The point is that as long as your money is in the IRA you can earn interest or buy stocks, sell for a profit, over and over and not pay any taxes on your gains in between.
Imagine you have $100k in a normal trading account and $100k in an IRA. You make the same trades in both and both are up $20k at the end of the year. Let's say then you want to trade out and take profit. The normal account triggers taxes on $20k worth of capital gains, so maybe it now has $115k in it. The IRA doesn't, so it still has $120k in it. Go ten years like that. At the end when you withdraw from the IRA, yes you have to pay taxes on the total gains (if it's not a Roth) BUT you had the use of that extra $5k every year you didn't pay taxes on! The whole time, all that tax money you didn't pay compounds to let you make more money with it. That's the concept. You're allowed to keep using the money that you would've otherwise had to give to the government, to make more money along the way. The final 20% you pay when you cash out is less than how much you made by compounding the tax savings and plowing them back into investments.