Why a routine Required Minimum Distribution (RMD) can raise your taxes by more than the withdrawal itself, and how Qualified Charitable Distributions (QCDs) help defuse it, including how the senior bonus deduction changes the math.
If you've read much about RMDs and taxes, you've probably run across the phrase "tax torpedo." It refers to how a jump in taxable income from an RMD can make more of your Social Security benefit taxable at the same time, so a single withdrawal has a double impact on your tax bill. "Torpedo" sounds dramatic, but the mechanism itself is straightforward once you see it laid out, and understanding it is what makes QCDs such a useful tool for managing it.
If your combined income, called "provisional income," is above a threshold, part of your Social Security benefit becomes taxable, up to 85% of it at higher income levels. Provisional income is your other taxable income (pensions, IRA withdrawals, interest), plus any tax-exempt income, plus half of your Social Security benefit. Once an RMD pushes that number up, each additional withdrawal dollar can result in more than a dollar of taxable income, since it's taxable on its own and also makes a larger share of your Social Security taxable.
Here's a concrete illustration. A couple, married filing jointly, both over 65, has $25,000 from a pension, $10,000 from IRA withdrawals, $1,000 in interest, and $50,000 in Social Security benefits. Their provisional income is $25,000 + $10,000 + $1,000 + half of $50,000, or $61,000, comfortably above the $44,000 threshold where up to 85% of Social Security becomes taxable.
Now suppose an RMD forces them to withdraw an additional $10,000. Provisional income rises to $71,000, and the taxable portion of their Social Security benefit climbs along with it. Work through both calculations, and the extra taxable income from that single $10,000 withdrawal comes to $18,500, not $10,000. At a 12% marginal bracket, that's an effective rate of 22.2% on the withdrawal, nearly double what the marginal bracket alone would suggest. That's the torpedo; it's the tax code's ordinary mechanics of the Social Security taxability formula compounding with an RMD.
If the withdrawal is one you were forced into anyway, which RMDs generally are, this isn't something to lose sleep over, but it's worth understanding, since it can also push your income across an IRMAA threshold and raise Medicare premiums on top of the income tax itself, compounding the effect further.
See your own tax torpedo, not a generic example. The Tool calculates the taxable portion of Social Security, year by year, using your actual RMDs, pensions, and withdrawals.
The One Big Beautiful Bill Act (OBBBA), signed in 2025, added a temporary deduction for taxpayers 65 and older: up to $6,000 per person, available whether you itemize or take the standard deduction, running through the 2028 tax year. It phases out for higher earners, starting at $75,000 of Modified AGI for single filers and $150,000 for married filing jointly, reduced 6% for every dollar above that, and it's gone entirely above $175,000 single or $250,000 joint.
Because it directly reduces AGI, this deduction can meaningfully soften the tax torpedo; less taxable income means a real chance that less of your Social Security ends up taxable too. But because it phases out based on income, anything that keeps your AGI lower helps you keep more of it. That's exactly where QCDs come in.
A Qualified Charitable Distribution sends money directly from a traditional IRA to charity, available starting at age 70½, and it's excluded from your income entirely, not just deducted from it. That distinction matters more than it might seem: a QCD counts toward satisfying your RMD, but unlike a regular withdrawal followed by a charitable gift, it never touches your AGI at all.
Since the senior deduction phases out based on AGI, keeping AGI lower through QCDs helps preserve more of that deduction, on top of whatever it's already doing to reduce the taxable share of your Social Security. The two provisions reinforce each other: a lower AGI from QCDs helps protect the senior deduction, and a larger senior deduction further reduces the taxable income the tax torpedo has to work with. The IRS imposes annual limits on the size of QCDs, but they increase each year with inflation.
QCDs are modeled the same way here. Turn on the QCD section in the Tool, and it applies the mechanics described above: the distribution offsets your RMD without ever counting as taxable income, and it is removed from the calculation that determines how much of your Social Security gets taxed.
Once QCDs are part of the picture, the RMD you're required to satisfy is smaller than the RMD calculated on your account balance alone, since the QCD amount counts toward it. A simple way to think about the minimum you need to withdraw each month is the remaining RMD, after subtracting any QCDs, spread evenly across the year: (RMD − QCD) ÷ 12. Spending more, or giving more through QCDs, changes that number, but never below what actually satisfies the requirement.
Here's a full worked example using current figures. A couple, both 65 or older, has an $800,000 traditional IRA and is 75 this year, where the IRS divisor is 24.6, putting the RMD at $32,520. They plan a $10,000 QCD, leaving $22,520 still required from regular withdrawals, or roughly $1,877 a month. Combined with $50,000 in Social Security, their taxable Social Security is about $8,992, for a gross income of around $31,500. Since both spouses are 65 or older and their income is well under the phase-out threshold, they qualify for the full standard deduction plus the full senior bonus, $47,500 combined. Their taxable income after the deduction: zero. No federal income tax owed at all, on an $800,000 IRA taking a full RMD, entirely because the QCD and the senior deduction are doing their job together.
Since the withdrawal in this example already fully covers what's required, there's nothing left to withhold for taxes, though it's worth knowing that RMDs can also be used to satisfy tax withholding directly: withdrawing extra late in the year and electing a withholding percentage on that distribution is a legitimate way to meet estimated tax obligations without separate quarterly payments, if your situation calls for it.
If you don't need to spend your full RMD to live on, that's a fortunate position, usually meaning other income sources are covering your needs already. You still have to withdraw it and pay any tax that's due, but you don't have to spend it. Reinvesting it in a taxable brokerage account is a perfectly reasonable choice, and for anyone concerned about the senior deduction's phase-out or an IRMAA threshold, keeping that withdrawal from pushing income any higher than it has to, through QCDs where giving is already part of the plan, is worth real consideration.
The senior deduction is temporary and is currently scheduled to expire after the 2028 tax year, while the underlying 2017 tax rates were made permanent under OBBBA. That combination creates a planning window: through 2028, staying below the phase-out thresholds captures the full benefit of the deduction, and QCDs are one of the more direct ways to do that if income would otherwise run high. It may also be worth delaying Roth conversions that would push MAGI over the threshold during these years, saving that conversion activity for after the deduction has expired, when a higher MAGI carries less of a trade-off. For 2029 and beyond, if the deduction sunsets as scheduled, taxable income will likely run higher for the same withdrawal pattern, so it's worth building that into a multi-year plan now rather than reacting later.
The tax torpedo isn't a special penalty; it's ordinary tax mechanics: an RMD is taxable on its own, and it can simultaneously make more of your Social Security taxable too. QCDs address this directly by removing income from the equation entirely rather than just deducting it, and under current law, that same AGI reduction also helps protect the temporary senior deduction from its own phase-out. For anyone taking RMDs and already inclined to give, the combination is worth understanding in detail, since the effect on your actual tax bill can be larger than it first appears.
Run your own numbers. Head to the Tool and enter your actual IRA balance, Social Security, and QCD plans to see your RMD trajectory, actual tax brackets, and how much of the torpedo effect QCDs actually offset for you.