Every conversion this month was sized against $1,200,000. The convertible balance is $1,154,716.98.

This article first appeared in The Nest Egg, my daily email, on 2026-10-05. Read the original issue. It is educational, not a recommendation for you. The household in it is a hypothetical example, and market figures are as of the date shown and will have changed.

Every figure below names its document. Every calculation is shown. Nothing here is a forecast.

Good morning. A clean risk-on Friday, the VIX down 6.59% to 15.31 and the Nasdaq 100 through 30,800. Then the promise from Friday's letter, kept: every conversion this month, re-run from the required distribution up.

In today's issue

The tape. Everything green, volatility down six and a half percent, and both ends of the curve a touch higher. Two minutes.

$1,154,716.98. The account every conversion this month should have been sized against. Four minutes.

$165,000.00. The corrected ceiling, and why it is a round number. Five minutes.

One more thing. The three years her required distribution does not move, and the $25,500 the calendar is worth. Two minutes.

The tape

Close of October 2, 2026. Index and futures levels from CNBC US Markets, pulled at 4:15pm ET. Treasury yields are as of that moment, not the official close. Gold is the December 2026 contract and WTI the November 2026 contract, both unchanged from Thursday.

A broad green Friday with no single driver. All four indexes finished higher, the Nasdaq 100 leading at 1.00%, and the VIX gave up 6.59% to 15.31, its lowest print on this page in two weeks. Gold slipped 0.71% and crude gave back 1.46% to $91.51 on the same November contract that jumped three percent on Thursday. Both ends of the curve rose a little, the 10-year by 4.3 basis points and the 30-year by 2.6.

The story

Thursday's letter found that this household's required distributions began this year rather than in 2028. Friday's ended with the obligation that follows from it: every conversion published between September 18 and September 24 was sized against a $1,200,000 account, and that account has a mandatory withdrawal coming out of it first.

Today we re-run all of it.

Six things change. Five of them are inputs and one is a date, which is the same pattern as the three corrections before it. None of them is an arithmetic error. That is starting to look less like bad luck and more like the actual lesson.

The position

The same household for the nineteenth session. $1,600,000 in bonds, a $1,200,000 traditional IRA, Social Security of $44,000 on his record and $30,000 on hers, both age 73. He dies in the conversion year, which is the case September 24 priced and the case the whole month has been building toward.

Carried forward from last week, both verified at the source: the municipal ladder yields 4.51% to maturity, her taxable Social Security caps at $37,400, and the single Medicare line that costs her money is $109,000. The gap between those two is $71,600, and it is a budget for every countable dollar she has.

The arithmetic

Step one. There is a year-of-death required distribution, and September 24 said there was not.

That letter contains this sentence: "Both were 73, so neither had reached 75 and there is no year-of-death required distribution." The first half was wrong on Thursday. The second half is wrong today.

From IRS Publication 590-B, under Distributions in the year of the owner's death, read Friday:

"If the owner died on or after the required beginning date, the IRA beneficiaries are responsible for figuring and distributing the owner's required minimum distribution in the year of death. The owner's required minimum distribution for the year of death is generally based on Table III in Appendix B."

He is 73, so he is past his required beginning date. His 2026 distribution is $1,200,000 divided by 26.5, or $45,283.02, and if he does not take it before he dies, she has to.

Step two. That money can never be converted.

A required distribution is not eligible for conversion. It comes out first, as ordinary income, and only what is left behind can move to a Roth.

So the convertible balance in the conversion year is not $1,200,000. It is $1,200,000 less $45,283.02, or $1,154,716.98.

Step three. The growth risk that broke September 23 does not exist.

That letter grew the account for two years between the conversion and her first required distribution, then showed the plan failed at anything above 0.57% annual growth. It called the conversion "a bet that a $1.1 million retirement account would go sideways for two years," which was a fair thing to say about the model it had.

There is no two-year gap. Distributions are already running, and her next one is computed on the December 31 balance. A conversion completed before that date lands in the divisor immediately and with certainty. Growth matters for the years after, but it cannot reach between a December conversion and the distribution that follows it.

That correction runs in our favor, and it is the only one today that does.

Step four. The corrected ceiling, and why it is round.

Her ladder is sized to the budget: $71,600 divided by 4.51% is $1,587,583.15, paying exactly $71,600 of tax-exempt interest. Her taxable Social Security is capped at $37,400.

In the year of death she files jointly, so the lines that measure her are the joint ones, $218,000 and $274,000. Her Medicare income is the conversion plus the capped benefit plus the ladder. So the ceiling is one subtraction, twice:

$218,000 less $71,600 less $37,400 is $109,000, the conversion that pays no surcharge at all.

$274,000 less $71,600 less $37,400 is $165,000.00, the conversion that stops at the first tier.

September 24 converted $166,465.31.

Six corrections to the conversion work published September 18 to September 24. Denominators and the year-of-death rule from IRS Publication 590-B, read October 2, 2026. Medicare lines from ssa.gov. Municipal yield to maturity 4.51% from the iShares MUB fund page.

Step five. What that $1,465.31 of overshoot costs.

September 24 reported Medicare income of $257,145.31 and called it $16,854.69 of room under the $274,000 line. It used a ladder paying $53,280, which was the 3.33% distribution yield corrected on September 29 to a 4.51% yield to maturity.

At the real yield the ladder pays $71,600, and the same conversion produces Medicare income of $275,465.31. The cushion is not $16,854.69 under the line. It is $1,465.31 over it.

Price the two side by side. At $165,000 the tax is $25,952.00, an effective rate of 15.73%, and the 2028 surcharge is $1,148.40. Total $27,100.40.

At $166,465.31 the tax is $26,274.37, an effective rate of 15.78%, and the surcharge doubles to $2,884.80. Total $29,159.17.

The last $1,465.31 of that conversion costs $2,058.77. An effective rate of 140.50% on the overshoot.

On September 25 this letter ranked the week's decisions and listed the $274,000 line as one of exactly two items worth nothing at all. It is worth $1,736.40, and it is worth it in the wrong direction.

The exchange rate

Friday's brief asked which comes first, the conversion or the charitable distribution, on the theory that they compete for the same account.

They do not compete. Measure what each one buys.

Her binding constraint is $71,600 of countable income. A qualified charitable distribution removes a dollar of required distribution from her income entirely, so $1 given frees $1 of budget, which at 4.51% supports $22.17 of municipal ladder.

A conversion reduces next year's required distribution by one twenty-five-and-a-half-th of itself, because that is the Table III denominator at 74. So $1 converted frees $0.04 of budget, which supports $0.87 of ladder.

The charitable distribution is 25.5 times more efficient at the one job the $109,000 line requires, and the multiple is not a coincidence. It is the denominator.

Put it the other way. To free the budget that a $45,283.02 charitable distribution frees, a conversion would have to move $1,154,716.98, which is every convertible dollar in the account.

And here is why the question of order never had to be asked. The required distribution comes out first by statute and can never be converted. The charitable distribution operates on exactly those dollars. The conversion is forbidden to touch them. They are not two ways to do one thing. They are two different things, running on two different pools, and the sequence is fixed by law rather than by arithmetic.

What is left of the case for converting

This is the uncomfortable part.

With the charitable distribution running each year, her position in every survivor year is: adjusted gross income $37,400, taxable income $19,250, federal tax $2,062, Medicare income exactly $109,000, surcharge zero.

A conversion cannot improve on zero.

September 22 priced a payback of 4.44 years. September 23 said 10.91. September 24 said 8.18. All three divided a conversion cost by an annual saving, and in all three the saving was overwhelmingly one Medicare tier in her survivor years. That tier is now removed for free, every year, by a form.

A payback period with a zero denominator is not a long payback. It is no payback.

So the conversion has to stand on the one argument this letter has never priced properly, which September 18's estate attorney raised and nobody followed up on. A traditional IRA left to a child is ten years of distributions taxed at that child's own rate, usually in their peak earning years. A Roth is ten years of nothing.

Convert $165,000.00 at a total cost of $27,100.40 and the break-even is a child's marginal rate of 16.42%. Above that the conversion wins. Below it, it loses.

That is the whole case now. Not a bracket, not a cliff, not a payback period. One number belonging to someone who is not in the room.

What the four of them would say

The portfolio manager. Notice what survived three weeks of corrections and what did not. Every portfolio figure held: the ladder is still $1,600,000, the IRA is still $1,200,000, the yields are what the market says they are. What collapsed was a denominator, a date, a yield convention and a growth window. The portfolio was never the fragile part. The scaffolding around it was.

The CPA. A 140.50% effective rate on the last $1,465.31 is the number to take away. Nothing in the tax code produces a rate like that. It comes from a cliff with no taper, where $1 of extra income doubles a surcharge for a full year, two years later. When a plan lands within a few thousand dollars of a Medicare line, the only safe move is to land deliberately under it, because the penalty for being slightly over is not proportional to anything.

The financial planner. Four corrections in eight sessions, and every one was an input. A denominator, a yield, a quantity, a date. The arithmetic has been right every single time, which is exactly why this kept happening: when the model runs clean, nobody goes back to check what was typed into it. The lesson is not to be more careful with the math. It is that confidence in the math is what hides the inputs.

The estate attorney. Read the last section again and see what it actually says. The charitable distribution takes care of her completely, and it does it by giving the money away. The conversion takes care of the children, and it does it by paying tax now. Those are not competing tax strategies. They are a question about who this money is for, and it has been sitting underneath nineteen sessions of arithmetic without anyone asking it out loud.

One more thing

Two small things fell out of the corrected table that are worth keeping.

First, her required distribution barely moves for three years. On a flat account: 2026 is $1,200,000 divided by 26.5, or $45,283.02. 2027 is $1,154,716.98 divided by 25.5, which is $45,283.02, identical to the penny. 2028 is $1,109,433.96 divided by 24.6, or $45,098.94, which is $184.08 lower.

The reason is that the denominator falls by exactly 1.0 from 73 to 74, which holds the distribution flat, and by 0.9 from 74 to 75, which lets it drift down. This letter has spent three weeks treating her required distribution as a growing threat. On a flat account, for three years, it is a constant.

Second, the year of death is worth exactly $25,500 of conversion room. With both alive, the ceiling under the $274,000 line is $139,500. With only her, it is $165,000.00. The difference is the drop in taxable Social Security when the household's benefit goes from $74,000 to $44,000: the capped amount falls from $62,900 to $37,400, which is $25,500, and every dollar of it becomes room.

The entire value of that calendar year, in conversion terms, is one subtraction on the Social Security worksheet.

Tomorrow

The conversion now rests entirely on a 16.42% break-even belonging to a beneficiary this letter has never once described.

Tomorrow we price the ten-year rule properly: what an inherited traditional IRA actually does to a child's return across those ten years, whether the distributions can be shaped, and what the same money looks like arriving as a Roth.

It is the one argument for converting that three weeks of Medicare arithmetic never touched, and it is now the only one left standing.