Three buckets, RMDs, and the tax torpedo, in plain English.

What is the tax torpedo, and how do RMDs set it off?

The tax torpedo is the stacking effect that happens when withdrawals from tax-deferred accounts pull more of your Social Security benefits into taxable income at the same time. One extra dollar out of your IRA can be taxed as if it were nearly two dollars, because the benefit dollars it drags in get taxed alongside it.

Here is the mechanism in plain terms. The IRS decides how much of your Social Security is taxable using what the Social Security Administration calls combined income: your adjusted gross income, plus any tax-exempt interest, plus half of your benefits. Above one threshold, up to 50 percent of your benefits become taxable. Above a second threshold, up to 85 percent do. Those thresholds were written into law decades ago and have never been adjusted for inflation, which is why more retirees cross them every year.

RMDs feed straight into that formula. Every required dollar raises your combined income, and in the phase-in range each extra dollar of withdrawal can pull up to 85 cents of benefits into taxable income with it. You did not enter a higher bracket, yet your tax bill climbs faster than your bracket suggests. That is the torpedo.

Two honest qualifiers. First, the torpedo is not a special penalty; it is just two ordinary rules interacting. Second, it mostly hits middle retirement incomes. Lower incomes stay under the thresholds, and higher incomes are already at the 85 percent maximum, where extra dollars stop dragging benefits in. Knowing which zone you are in is exactly the kind of question a written plan should answer before RMDs begin.

Where do annuities fit in the retirement tax picture?

Annuities live in bucket 2. Growth inside a deferred annuity is tax-deferred, never tax free, and withdrawals of gain are taxed as ordinary income. Within that bucket, though, annuities carry a handful of specific tax features worth knowing before anyone quotes you anything.

• Tax-deferral without a contribution cap. A non-qualified annuity, one bought with after-tax money, compounds without an annual tax bill on the inside gain. The trade: gains generally come out first when you withdraw, taxed as ordinary income, and withdrawals before age 59½ may face a 10 percent federal penalty.
• The exclusion ratio. If you convert a non-qualified annuity into a stream of payments, each payment is split. Part is treated as the return of your own money and is not taxed; part is gain and is taxed. Once your original principal has been fully recovered, payments become fully taxable. Annuities bought with pre-tax IRA or 401(k) money have no after-tax basis, so those payments are fully taxable from the start.
• No lifetime RMDs on non-qualified annuities. Unlike an IRA, a non-qualified deferred annuity has no lifetime required minimum distributions. That is a genuine flexibility advantage for money you may not need on the government's schedule.
• The QLAC option for RMD timing. A qualified longevity annuity contract, bought inside an IRA or 401(k), is excluded from your RMD calculation, and its income can start as late as age 85. The statutory limit is $210,000 for 2026, indexed for inflation. The honest trade-offs: the decision is essentially irreversible, the money is illiquid until payments begin, and every payment is fully taxable ordinary income when it arrives.

One disclosure belongs next to every annuity sentence on this site: any guarantee is backed by the claims-paying ability of the issuing insurer. It is not FDIC-insured or bank-guaranteed. Annuities are long-term products and may carry surrender charges. For the fuller picture, see our guides to guaranteed lifetime income and the honest annuity versus CD comparison.

Are Roth conversions the answer to all of this?

Sometimes they are part of the answer. A Roth conversion moves money from bucket 2 to bucket 3: you pay ordinary income tax now on the amount converted, and in exchange that money faces no lifetime RMDs and its qualified withdrawals stay out of the torpedo and IRMAA math later.

The costs are just as concrete. The converted amount is taxable income in the year you convert, which can push you into a higher bracket, set off the torpedo on that year's benefits, and raise your Medicare premiums two years later. And since 2018, conversions cannot be undone. There is no do-over if the math turns out wrong.

That is why the honest framing is tax diversification, not tax elimination. Future tax rates are unknowable, so spreading your money across buckets is a hedge, not a promise of a zero-tax retirement. Many households that benefit do smaller partial conversions over several years, filling lower brackets deliberately in the window between retiring and starting RMDs. Whether that applies to you is a numbers question, and it is one to price out with a CPA or qualified tax professional before year-end, not a decision to make from an article, including this one. Our self-check, is an annuity right for me, pairs well with that conversation.