A 68-year-old widower in south Georgia spent the summer of 2024 arranging the sale of a pine stand his grandfather planted in 1958. His usual modified adjusted gross income (MAGI) runs about $46,000 between pension income, taxable Social Security and other sources.
A regional mill offered $240,000 for the standing timber. After timber basis and selling expenses, roughly $200,000 remained as taxable gain, receiving favorable long-term capital-gain treatment. He signed. Two years later, the Social Security Administration mailed him a new Medicare premium notice. His 2026 Part B bill had jumped from $202.90 to $649.20 a month. That is nearly $5,400 more for the year, arriving long after the timber check.
How a Timber Sale Turns Into a Medicare Bill
Standing timber held long enough and sold under qualifying rules can receive capital-gain treatment instead of being taxed like ordinary business income. The IRS also makes clear that timber basis matters: taxable gain is the difference between what the owner realizes and the applicable adjusted basis and costs, not simply the size of the check.
The favorable tax treatment does not keep the gain out of Medicare’s calculation. The taxable gain flows into adjusted gross income (AGI), and Medicare’s MAGI adds tax-exempt interest on top. Medicare generally looks back two years. His 2024 tax return therefore determines his 2026 income-related monthly adjustment amount (IRMAA). This year, a single filer with MAGI above $205,000 but below $500,000 pays $649.20 a month for Part B instead of the standard $202.90. The good news is that IRMAA gets recalculated annually. If his 2025 income returned to normal, the timber sale does not necessarily leave him paying the higher amount indefinitely.
Bracket the Timber Check Bought
Add the $240,000 gain to $46,000 of baseline income and MAGI lands near $286,000. As a single filer, that clears the fifth IRMAA tier: greater than $205,000 and less than $500,000. The 2026 numbers, from the CMS fact sheet issued November 14, 2025:
| Single MAGI (2024) | Part B total (monthly) | Part B IRMAA surcharge (monthly) |
|---|---|---|
| ≤ $109,000 | $202.90 | $0 |
| $109,001 to $137,000 | $284.10 | $81.20 |
| $137,001 to $171,000 | $405.80 | $202.90 |
| $171,001 to $205,000 | $527.50 | $324.60 |
| $205,001 to $499,999 | $649.20 | $446.30 |
| ≥ $500,000 | $689.90 | $487.00 |
The Part B surcharge alone runs $446.30 monthly for 2026. Part D piles on: the 2026 Part D IRMAA rises to a substantial amount a month at the top tier, on top of whatever the drug plan itself charges (we mapped the full set of income surcharges and coverage traps in a free Medicare guide here: Medicare’s Hidden Bills). The 3.1% Social Security COLA tracking for 2027 will not close the gap.
Why SSA-44 Will Not Erase the Timber Sale
The Medicare Income-Related Monthly Adjustment Amount-Life Changing Event form (SSA-44) can lower IRMAA when income falls because of one of eight specified events, including retirement or work reduction, marriage, divorce, death of a spouse and loss of pension income.
A voluntary timber sale is not one of them. Neither is a large Roth conversion or an ordinary voluntary sale of appreciated property. The fact that the income spike happened only once does not, by itself, qualify him for relief. That distinction matters. SSA-44 is designed for a change in circumstances that reduces income, not simply regret over an unusually profitable tax year. There are other routes when the underlying IRS information is actually wrong or later amended, so the notice should still be checked carefully before paying it unquestioned.
What to Do Before the Buyer Cuts a Check
The useful planning happens while the trees are still standing.
- Model sale-year MAGI before signing. Include the projected taxable timber gain, pension income, required minimum distributions, taxable Social Security, interest and any tax-exempt interest that IRMAA adds back.
- Ask whether the timber transaction can legitimately be spread across tax years through separate sales or another qualifying payment structure. The contract needs to support the tax treatment; simply asking the buyer to mail the check later may not.
- Know which escape hatch actually applies. If retirement, a spouse’s death or another qualifying event genuinely reduces income, SSA-44 may help. The timber sale alone does not.
His grandfather planted the pines more than six decades before Medicare ever entered the picture. Their value had plenty of time to grow. The smarter move is giving the tax calendar the same attention as the timber cruise before the first tree comes down.
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