If you can sustain 5% interest, that's $500k a year taxed at 15%. That might not be fuck-you but it's certainly good enough for pretty much anything you might want to reasonably do with the rest of your life. (Barring ultra luxury of course.)

Interest is taxed at marginal rates, not capital gains rates. (You may be thinking of dividends.) Moreover, at $500k/year, you would be subject to the new higher capital gains rate of 20%...

I think we are getting a bit pedantic here. You can get by just fine on 500k a year, even if taxed at top rates.

Invest in municipal bonds. Interest is not subject to federal income tax.

There are plenty of high quality bond funds I can invest in with 5% return where the returns are taxed as dividends and not interest.

When we talk about "interest" here, I think its defined as passive low-risk investment income that is able to be taxed at a lower capital gains rate.