A retired couple, both aged 66, pulling in $14,000 a month sounds like a great retirement. The mortgage is gone, the kids are launched, and the monthly deposit lands like clockwork. Gross income of $168,000 a year puts this household well above the $68,391 per capita disposable income figure for early 2026. But the net that actually reaches the checking account is a very different number, and one wrong move on a Roth conversion can cost them thousands.
The income stack is typical for a two-earner professional couple who saved diligently: about $58,000 in combined Social Security and roughly $110,000 drawn from a $2.75 million portfolio. That draw sits at a sustainable rate, and Social Security got a lift from the 2.8% COLA that took effect for 2026.
The Bureau of Labor Statistics puts average annual household expenditures at $78,535 in 2024, and the typical retired couple runs closer to $5,000 a month all-in. This household is spending at nearly triple that pace, so they’re better off than most.
Walking the Net
The gross income is not a reflection of what actually reaches the checking account. Between federal tax and Medicare, a meaningful slice comes off the top:
- Federal income tax runs roughly $26,000. Under the 2026 married-filing-jointly brackets, the couple sits comfortably in the 22% bracket that runs to $206,700 of taxable income, with the $32,200 standard deduction shielding the first layer.
- Medicare Part B, Part D, and IRMAA surcharges combine to around $9,000 for the year.
- Net spendable cash lands near $11,100 a month.
The single most important financial tension here is where their MAGI sits relative to the Medicare income tiers. The 2026 IRMAA schedule for joint filers charges nothing extra below $218,000, then jumps to a $81 per person monthly surcharge for MAGI between $218,000 and $274,000, and escalates from there. The next tier adds $203 per person per month on top of the base Part B premium.
Because IRMAA is a cliff rather than a phase-in, a single extra $1,000 of realized capital gains, dividend reinvestment sold at the wrong time, or an oversized Roth conversion can trigger the next tier for both spouses and cost more than $2,000 in surcharges over the year.
On the spending side, the picture is comfortable: $3,000 a month for housing costs on a paid-off home (taxes, insurance, utilities, maintenance), $1,800 for food and dining, $2,500 averaged for travel, $1,200 for healthcare extras, and $1,000 for cars and insurance. What is left funds grandkids, gifting, and a cash reserve. The annual gift exclusion of $19,000 per recipient in 2026 gives them room to move some money to heirs tax-free.
The scenario looks stable until one spouse dies. Social Security drops to the survivor benefit, which is the higher of the two checks rather than both, so household income falls by roughly 30%. The survivor refiles as a single taxpayer the following year, and the same portfolio distributions get squeezed into a much tighter bracket schedule: single filers hit the 24% bracket at $105,700 instead of the joint threshold of $211,400. IRMAA tiers compress the same way.
Two Paths Worth Modeling Now
- Managed Roth conversions between now and RMD age. Fill the 22% and 24% joint brackets deliberately, keeping MAGI just below the next IRMAA tier at $218,000 or $274,000. This shrinks future required distributions, softens the widow’s penalty, and moves assets into a bucket that never triggers IRMAA when tapped. The tradeoff is a higher tax bill now in exchange for a materially lower one later.
- Do nothing and drift. The couple stays comfortable, but by their mid-70s the RMDs kick in, MAGI climbs, IRMAA tiers rise with them, and the surviving spouse eventually inherits an oversized tax-deferred balance under single-filer rules.
What to Evaluate First
Pull last year’s Form 1040 and calculate MAGI. If it sits within $5,000 of an IRMAA tier boundary, that is the first problem to solve. Second, get a survivor-benefit projection from Social Security and stress-test the household budget at the lower number under single-filer brackets. A fee-only advisor earns their keep here because the multi-year Roth conversion sequence, paired with IRMAA tier management, is a complicated process.
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