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Yes—selling appreciated Berkshire shares generally realizes the capital gain in the sale year, even if every dollar of the sale proceeds is later donated. The cash gift is a separate charitable-contribution event. Medicare can then use the income reported on that tax return two years later when it determines income-related Part B and Part D premiums (IRMAA). A deduction may be available for the gift, but it is conditional and does not automatically erase the gain from the modified adjusted gross income Medicare uses.
What happens when shares are sold and the cash is donated?
There are two transactions, not one combined “charitable sale.” First, the owner sells the Berkshire shares. Second, the owner transfers cash to a charity or other eligible recipient. Tax law generally treats the sale as a disposition of the stock and recognizes the difference between the sale proceeds and the owner’s adjusted basis as a capital gain or loss.
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The sale creates the gain
For the sale, the important facts are the proceeds, adjusted basis, selling costs, and the dates the shares were acquired and sold. In simplified form, the gain is the proceeds minus adjusted basis and allowable selling costs. The holding period affects whether the gain is short-term or long-term and therefore which capital-gain rules apply. The gain is reported for the tax year in which the sale occurred, subject to the taxpayer’s complete return and any applicable netting or loss rules.
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1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitchesDonating the cash afterward does not reverse the sale. The brokerage transaction still occurred, and the gain still belongs to that tax year. The charity receives money, not the shares that produced the gain.
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The cash gift is a separate deduction question
Internal Revenue Code §170 begins with the rule that “There shall be allowed as a deduction any charitable contribution (as defined in subsection (c)) payment of which is made within the taxable year.” The statute’s full rules determine which recipients qualify, how the contribution is substantiated, what property and valuation rules apply, and which percentage limits restrict the deduction. See 26 U.S.C. §170.
For a cash gift, the donor must generally give to an eligible organization, keep the required records, and claim the deduction in the way the tax return permits. The deduction normally matters only if the taxpayer itemizes rather than taking the standard deduction. The amount that can be used in a particular year can also be limited by adjusted gross income, the recipient, the type of contribution, and other rules described in IRS Publication 526 (2025).
A deduction reduces taxable income under its own rules. It is not the same thing as removing the stock-sale gain from the income figure used for Medicare. The two calculations can produce different results on the same return.
If I sell stock and donate the cash, does the capital gain still count for Medicare?
Generally, yes. A realized gain from the stock sale can increase the modified adjusted gross income (MAGI) shown on the tax return that Medicare later reviews. The subsequent cash contribution may generate a charitable deduction if all requirements are met, but you should not assume that the deduction dollar-for-dollar offsets the gain for IRMAA purposes.
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Medicare does not assess an IRMAA surcharge at the moment a share is sold. Instead, it uses tax-return information from an earlier year. The Centers for Medicare & Medicaid Services states in Medicare & You 2026: “Medicare uses the modified adjusted gross income reported on your IRS tax return from 2 years ago to determine if you’ll pay an extra charge, called the Income-Related Monthly Adjustment Amount (IRMAA).” Read the handbook at Medicare & You 2026.
That lookback is why a one-time sale can affect premiums after the transaction seems finished. The return reports the gain; Medicare later receives the relevant income data and applies the premium-year thresholds and filing status that are in effect then.
Can a Berkshire share sale raise Medicare premiums two years later?
It can, if the gain pushes the taxpayer’s MAGI above an IRMAA threshold for the applicable premium year. The timing has to be stated precisely:
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- Sale year: The owner sells the shares and reports the resulting gain on that year’s federal return.
- Return year: The gain becomes part of the income information on that filed return, along with all other income, deductions, filing-status information, and adjustments.
- Premium year: Two years later, Medicare generally uses that return to decide whether Part B and Part D income-related adjustments apply.
For example, a gain reported on a 2024 tax return is generally the return Medicare references for 2026 premiums. That does not mean every 2024 seller receives an IRMAA charge: the result depends on total MAGI, filing status, Medicare enrollment, and the thresholds for the premium year.
What do the 2026 Medicare figures show?
The official 2026 schedule says that 2024 MAGI above $109,000 for an individual filer or $218,000 for a joint filer may trigger Part B IRMAA. Those are starting points, not a complete calculation; the schedule has multiple income bands and separate treatment by filing status. The standard monthly Part B premium for 2026 is $202.90, while higher-income beneficiaries pay the tier amounts listed below.
| 2026 monthly Part B amount | How to read it |
|---|---|
| $202.90 | Standard premium amount in the 2026 Medicare Costs schedule |
| $284.10 | One of the 2026 income-related tier amounts |
| $405.80 | One of the 2026 income-related tier amounts |
| $527.50 | One of the 2026 income-related tier amounts |
| $649.20 | One of the 2026 income-related tier amounts |
| $689.90 | One of the 2026 income-related tier amounts |
These are 2026 figures only; they are not a permanent premium schedule. The exact band depends on the beneficiary’s filing status and the MAGI Medicare receives. The complete table is in 2026 Medicare Costs. A headline about selling shares cannot establish which, if any, amount applies to a particular person.
Does the charitable deduction lower the income Medicare uses for IRMAA?
Not automatically. A charitable deduction and Medicare’s MAGI test are related to the same tax return but are not interchangeable measures.
- Deduction eligibility: The recipient must qualify, the contribution must be made and documented properly, and the donor must satisfy the rules for claiming it.
- Itemization: A taxpayer who does not itemize may receive no separate federal income-tax benefit from a cash contribution, even though the donation was real.
- Limitations: Percentage-of-income limits and other restrictions can defer or restrict the amount usable in the contribution year.
- Medicare calculation: IRMAA is based on the MAGI Medicare obtains from the specified prior-year return. Whether a deduction changes that figure, and by how much, requires reviewing the complete return rather than subtracting the gift from the stock gain.
Consequently, “I donated the proceeds” is not enough information to predict an IRMAA result. Basis, proceeds, other income, deductions, filing status, the recipient, and the premium year all matter.
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Would donating the appreciated shares directly avoid the gain?
A direct gift of qualifying appreciated shares can have a different result from selling first and donating cash. If the charity or charitable giving account is eligible and able to receive securities, the donor may avoid the gain that would ordinarily be recognized on a sale. A deduction may also be available, subject to the recipient, valuation, substantiation, holding-period, itemization, and percentage-limit rules.
This is a planning comparison, not a guaranteed premium-saving strategy. The shares must be eligible, the transfer must be completed correctly and on time, and the donor must confirm how the deduction and any limitations apply. A charity that cannot accept publicly traded stock may require a different method, and a failed or late transfer can produce a different tax result.
| Issue | Sell shares, then donate cash | Donate eligible shares directly |
|---|---|---|
| When the sale gain is realized | Generally in the year the shares are sold | A qualifying transfer may avoid a sale by the donor; no gain should be assumed without verifying the transfer and property rules |
| Value and basis | Proceeds and adjusted basis determine the realized gain or loss | Fair market value, basis, and holding period affect deduction and property treatment |
| Recipient requirements | Must qualify to receive the cash contribution | Must qualify and be able to receive and process securities |
| Deduction | Cash-contribution substantiation, itemization, and limits apply | Appreciated-property valuation, substantiation, itemization, and percentage limits apply |
| Medicare MAGI | The realized gain can appear on the return used in a later IRMAA determination | Different gain treatment may mean different MAGI, but no specific premium result is guaranteed |
| Lookback year | The return for the sale year is generally reviewed two years later | The return for the transfer year is reviewed under the same two-year mechanism |
Because the direct-gift route combines securities, charitable-contribution, and Medicare rules, it should be evaluated before a sale is placed. Once the shares have been sold, a later cash gift cannot retroactively turn that sale into a direct stock contribution.
What records and facts determine the answer?
Before estimating tax or Medicare effects, assemble the following information for the exact transaction:
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- Trade confirmations showing the sale date, number of shares, proceeds, and fees.
- Cost-basis records, including adjustments from reinvested dividends, prior transfers, gifts, or inherited shares.
- The date each lot was acquired, because holding period can change the capital-gain treatment.
- The charity’s legal name and confirmation that it is an eligible recipient; for a direct gift, confirmation that it accepts securities and the transfer instructions.
- A contemporaneous acknowledgment or other substantiation required for the contribution.
- The federal return for the sale year, including filing status, total MAGI, itemized deductions, and any carryforward created by contribution limits.
- The Medicare premium year and whether Part B and Part D coverage applies during that year.
These records allow a tax professional to test the charitable deduction under §170 and Publication 526, then compare the resulting return data with the Medicare schedule for the relevant premium year.
A practical decision sequence before selling
- Identify the objective. Decide whether the priority is raising cash, giving a fixed dollar amount, reducing a concentrated stock position, or combining those goals.
- Calculate the embedded gain by lot. Use verified basis and acquisition dates rather than an account’s unreviewed estimate.
- Check the recipient. Confirm that the organization qualifies for a deduction and, if considering a direct transfer, can accept the exact security.
- Model both tax years. Compare the sale-and-cash path with a direct share gift using the actual filing status, expected income, and contribution limits.
- Map the Medicare lookback. Mark the premium year that will use the return and obtain that year’s official thresholds and premiums.
- Document the transfer. Keep confirmations, acknowledgments, valuation information, and any communications showing when the gift was completed.
- Review with a qualified professional. A tax adviser who understands appreciated-property gifts and IRMAA can verify the return treatment before an irreversible sale.
Common mistakes that change the result
- Assuming “all proceeds donated” means no gain: The sale and the gift remain separate events.
- Using the gift amount as a direct MAGI subtraction: The deduction has its own eligibility, itemization, and limitation rules.
- Ignoring the two-year lag: A gain can affect a later premium year, not necessarily the year of the sale.
- Using the wrong filing status: Individual and joint thresholds differ, and the 2026 schedule cannot be applied without the correct status.
- Transferring shares without acceptance instructions: A charity’s inability to receive or timely process the security can defeat the intended direct-gift plan.
- Relying on an old premium table: Medicare premiums and thresholds can change each year; 2026 amounts should not be projected indefinitely.
What this scenario does—and does not—prove
The facts in the headline establish a plausible sequence, not a particular tax bill or premium increase. They do establish why the gain can be visible to Medicare: the stock was sold, the gain was reported, and Medicare generally looks back two years to tax-return MAGI. They do not establish the basis, gain size, total MAGI, filing status, deduction eligibility, or premium tier.
For a future article date or a later Medicare year, verify the current IRS publication, statutory limits, premium schedule, and thresholds. The 2025 Publication 526 and 2026 Medicare documents cited here are date-specific.
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