The Next Tax Shelter After Maxing Out Your 401(k)

May 17, 2026 - 23:16

A 58-year-old engineer in Palo Alto, married filing jointly, earns $750,000 a year. He has already stuffed $4 million into 401(k)s and IRAs, and parks another $1.2 million in a brokerage account that holds a single S&P 500 fund. The 401(k) is maxed. The mega backdoor Roth is maxed. The next tax dollar saved has to come from somewhere else.

For high earners who have exhausted every retirement account option, the next move involves a strategy worth roughly $40,000 in annual tax savings. It is not a new account type or a loophole. It is a shift in how you hold your investments.

The idea is simple. Instead of keeping that S&P 500 fund in a taxable brokerage account, you replace it with municipal bonds. The interest from most municipal bonds is exempt from federal income tax. For someone in the top bracket, that exemption is worth about 37 cents on every dollar of interest. A portfolio of $1.2 million in muni bonds yielding 3.5 percent generates $42,000 a year in tax-free income. The same amount in a taxable bond fund would leave you with roughly $26,000 after taxes.

There are trade-offs. Municipal bonds carry lower yields than corporate bonds. They also come with credit risk, though most are rated investment grade. And if you live in a state with high income tax, you can buy bonds issued by your own state to avoid state taxes too.

For the engineer in Palo Alto, this move does not require any new legislation or employer permission. It just requires a conversation with a tax advisor and a willingness to accept slightly lower returns in exchange for a much lower tax bill. After maxing out every retirement account available, this is the next logical step.