I Didn't Know Losing Him Would Cost This Much

The tax bill hiding inside every joint retirement plan, and how to defuse it while you still can

Diane came to see me last winter, about fourteen months after Walter passed. She was not there about grief. She had a stack of paperwork and a specific question: why had her tax bill gone up the year her income went down?

She and Walter had followed all the proper steps. Each of them was 74 years old, and both were receiving Social Security benefits. Both had been taking their Required Minimum Distributions—which the IRS requires retirees to withdraw each year from their pre-tax retirement accounts—from the traditional IRAs they had established together over three decades. Their financial situation was comfortable, ordinary, and well managed. Then Walter died, and the next year Diane learned something almost no one tells retired couples about.

Her household income had actually dropped by about $18,000. Her tax bill went up by more than $2,300 anyway.

It isn't an error in her return; it's a feature of how the tax code is structured, and it catches almost every surviving spouse by surprise because it isn't visible until the year it appears.

What Actually Happens the Year After

Here is the part that makes this so easy to miss. In the year a spouse dies, the survivor can usually still file a joint return, the same brackets, the same standard deduction, one last year that looks like every year before it. The change does not show up until the following tax season, often while the survivor is still working through the rest of what the first year alone requires.

Three things change simultaneously, and none of them appear on any single line of any document that Diane had seen previously.

The first point is about filing status; Diane changed from Married Filing Jointly to Single. Most retired couples who have a dependent child living at home have a two-year relief period known as Qualifying Surviving Spouse status, which allows a widow or widower to continue using the joint brackets. However, this provision only applies if a dependent child lives with you, thus excluding the vast majority of retirees. Diane, just like most of my clients in this position, moved directly from the joint brackets to single brackets the year after Walter died.

The second is the width of the brackets themselves. For 2026, a married couple stays in the 12% bracket up to roughly $100,800 of taxable income. A single filer tops out of that same 12% bracket at around $50,400, about half. The 22% bracket works the same way, roughly $211,400 for a couple and $105,700 for a single filer. Your income does not need to change at all for this to bite. Simply changing boxes on the form pushes the same dollars into a narrower set of brackets.

The third is the standard deduction. A married couple both over 65 gets a standard deduction north of $33,000. A single filer over 65 gets something closer to $17,500, roughly half. On its own, that split is not unfair. The problem is what it gets applied against. The deduction doesn't shrink unfairly. The income it is supposed to shelter mostly doesn't shrink at all.

If you combine those three changes together, that's exactly what happened to Diane. Since a surviving spouse receives the higher of the two benefits rather than the total of both, she kept Walter's bigger benefit and gave up her own smaller one, which meant a drop of $18,000 in her case. The required minimum distribution from her IRA remained about the same because the account balance had not changed; only the name on it had. Her gross income fell as well; all the other factors worked against her, so she ended up with a tax bill higher than the previous year even though she was receiving less money.

The Number That Surprised Her

Here is a comparison based on Diane and Walter's real figures.

The year before, filing jointly:

• Combined Social Security: $52,000
• Combined RMDs: $58,000
• Standard deduction (married, both 65+): about $33,200
• Taxable income: about $76,800
• Federal tax: about $8,700

The year after, filing single:

• Social Security (survivor benefit only): $34,000
• RMD (largely unchanged): $58,000
• Standard deduction (single, 65+): about $17,500
• Taxable income: about $74,500
• Federal tax: about $11,100

Her total household income decreased by 16%, her federal tax bill increased by about 27%, and her effective tax rate on that income rose from about 11% to nearly 15%, and all this was before I had even considered Medicare.

The Income-Related Monthly Adjustment Amount (IRMAA), which is added to Medicare premiums when income reaches certain levels, also cuts roughly in half for single filers in the same manner as the income brackets do.

Diane's income that year was just below the single-filer threshold, but only just so. A small capital gain, a slightly higher required minimum distribution (RMD) the following year as a result of her aging, or a CD renewing at a higher rate could be enough to push her over the threshold without her changing her behavior.

Since IRMAA is based on a two-year lookback period, a surprise this year will not be noticed until it appears in her Medicare premium two years later, yet another delay that makes the entire system seem as if it is working against those who are trying to keep an eye on it.

Why This Deserves Its Own Planning

Let me be clear on this point. It is not a reason to fear losing a spouse; rather, it is a reason to make arrangements while you still have the opportunity, since the planning must take place while both of you are alive. After one spouse dies, the account balances, the beneficiary designations, and the years of history associated with them will remain as they are. The only work left is to manage the result, not influence it.

Here is what I actually do with couples once we identify this exposure.

Start by running the survivor's return while you're both here. Use the actual figures for this year or the projected RMDs for next year and calculate the amount as though only one of you were filing. Most couples ha ve never come across this figure. Although it is uncomfortable, it is the only way to determine whether you are dealing with a small adjustment or a real problem, and it turns an abstract fear into a specific amount you can plan for.

Second, use your joint gap years to reduce the amount the survivor will eventually have to pay tax on on their own. This is by far the most effective measure available, and it is the same conversion period that I referred to earlier. Each dollar that you convert into a Roth account while you are both filing jointly and falling within the higher tax brackets will never trigger a required minimum distribution for the person who is left behind, who will then be taxed at narrower brackets later on. Diane and Walter have already taken some of these steps, which is one reason her figure was in the thousands rather than the tens of thousands. The more a couple does this, the better they protect the survivor.

Third, when reviewing your strategy for claiming Social Security, pay special attention to the survivor's benefit. The survivor will receive the larger of the two benefits and will keep it for the rest of their life. As a result, deciding when the higher-earning spouse should file is not only about determining your combined income in your sixties and seventies; it is also about what the survivor will have for their lifetime, possibly for many decades. If you delay making the claim until age 70, a larger amount will be secured for the person who needs it most when only one of you will be relying on it.

Fourth, consider the way the IRA is titled and how it will be transferred. A surviving spouse usually has the choice to roll the inherited IRA into their own name, which resets the required minimum distribution (RMD) calculation to their age and therefore provides most people with the greatest flexibility. In some cases—especially when the surviving spouse is young and needs to access the funds without penalty before age 59 and a half—it may be more sensible to remain as a beneficiary temporarily. This is not a decision that should be made for the first time while going through grief. Make sure you understand the option and the trade-off at this stage, so that when the time comes you can make an informed rather than a hasty choice.

What I Told Diane

There was nothing left to restructure retroactively for Diane's situation. The conversions that would have helped most needed to happen years earlier, and Walter was gone. What we could still do was smaller: coordinate her RMDs with a Qualified Charitable Distribution to lower her taxable income going forward, and make sure the following year's projection did not surprise her again.

What I told her, and what I tell every couple I work with, is that this piece of planning is different from almost everything else in a retirement plan. Sequence of returns risk, market volatility, even the RMD timebomb we've discussed elsewhere, all of those unfold over years and give you room to adjust as you go. This one does not.

The decisions that determine how large this bill will be, the conversions, the claiming strategy, the account titling, all of them have to be made while both spouses are sitting in the room together. There is no fixing it after.

Diane's question wasn't really concerned with the tax return at all; it was about whether Walter had left her in a strong position and whether the plan they had made together would have stood up in his absence. The straightforward reply was that it had held up quite well, better than it would have if no plans at all had been made, but not as well as it could have done if they had looked at that particular figure ten years earlier.

You still can. That is the entire point of writing this while you are reading it together.

This piece builds on How to Actually Use Your Roth Window and Build the Floor First. If you haven't run your own gap years numbers yet, start there.

Thanks for reading The Pensioner's Paradox. I write biweekly on retirement income, tax planning, and the structural side of retiring with confidence. If this piece resonated, subscribe at phil.cpa to get new pieces in your inbox. If you would like to talk through how these ideas apply to your own situation, you can reach me at phil.cpa.

If you and your spouse have never run this projection together, it may be the single most valuable hour you spend on your retirement plan this year, not because the news is always bad, but because it is far easier to hear while you can still do something about it.