10 Year-End Money Moves for Retirees in Their 50s in 2026

With the enhanced premium tax credits expired after 2025, the ACA subsidy cliff is back for 2026 coverage. Below 400% of the federal poverty level, roughly $84,600 of MAGI for a two-person household or $62,600 for a single filer, you pay about 10% of income or less for the benchmark silver plan and the credit covers the rest. Above it, the credit is zero. For a couple in their late 50s, unsubsidized premiums in the Phoenix market can easily run $1,500 to $2,000 a month, so the credit at the top of the eligible range is often worth $10,000 or more a year. MAGI for this purpose is AGI plus tax-exempt interest plus untaxed Social Security, so municipal bond interest does not escape it. If you received advance credits in 2026, the reconciliation on your 2026 return uses actual 2026 MAGI, and above the cliff every dollar of advance credit is repaid.

Three valuable moves all draw on the same limited space under that cliff: keeping the subsidy, harvesting gains at 0%, and converting to Roth. A couple with $25,000 of dividends and interest has roughly $55,000 to $59,000 of room before the cliff, and every dollar of conversion or realized gain uses some of it. The alternative is to cross the cliff deliberately. Once the credit is gone, the next dollar costs only the bracket rate, so it can make sense to convert up to the top of the 12% bracket (about $133,000 of gross income for a couple using the $32,200 standard deduction) or even the 22% bracket. The test is simple: divide the lost credit by the extra dollars you convert above the cliff and add that to the bracket rate. Losing $14,000 of credit to convert an extra $50,000 adds 28 points, which rarely pays. Losing it to convert an extra $150,000 adds about 9 points, which can.

Between gain harvesting and conversions, conversions usually win when the pre-tax balance is large. Harvesting gains at 0% only resets cost basis, which saves future capital gains tax at 15% plus Arizona's 2.5%. A conversion moves money permanently out of the RMD system and into an account with no lifetime required distributions. For someone in their 50s, RMDs start at 75, and a $1.5 million IRA growing for 20 years can produce first-year RMDs large enough to push a couple into the 24% bracket and IRMAA territory on top of Social Security. Gain harvesting is more valuable when the taxable account holds large embedded gains and the IRA is modest. Note the stacking order too: ordinary income, including conversions, fills the brackets first, so a conversion can push gains that would have been taxed at 0% into the 15% range.

What makes low MAGI possible for a couple spending $120,000 a year is the source of the spending. Withdrawals from cash and the cost basis portion of taxable sales create no income at all. Withdrawals of Roth IRA contributions (not conversions or earnings) are tax-free and penalty-free at any age. A couple can fund most of a year's spending from those sources while showing MAGI of $30,000 to $40,000, then add deliberate conversions on top. Withdrawals from a Rule of 55 401(k) or a 72(t) schedule are penalty-free but fully taxable, so they use up cliff room just like a conversion. That is why the 2027 withdrawal plan and the 2027 ACA estimate have to be built together.

Conversions in your 50s also create future penalty-free money. Each conversion starts its own five-year clock, and converted principal can be withdrawn without the 10% penalty once five years pass, even before 59 1/2. A couple who converts $50,000 in 2026 can reach that $50,000 in 2031. Repeating this each year builds a Roth conversion ladder that supplies spending money in later years and can reduce or eliminate the need for a rigid 72(t) schedule. The trade-off is that converted dollars need a five-year runway, so the first few years of retirement still have to be funded from taxable money, cash, Roth contributions, or the Rule of 55.

In October, build the 2026 MAGI projection from year-to-date statements: interest, dividends, realized gains, any IRA or 401(k) withdrawals, and any part-time or consulting income. Decide the strategy for the year: stay under the cliff with a cushion, or cross it with a conversion large enough to justify the lost credit. Everything later on the list gets sized from that decision, and it is much easier to make it now than after the fact.

In November, collect the missing numbers and start anything that takes time. Most fund companies publish estimated capital gain distributions in November, and one surprise distribution can push MAGI over the cliff. Open enrollment on HealthCare.gov starts November 1; compare 2027 plans once you have a 2027 income estimate. If you plan to give appreciated shares to a donor-advised fund, start the transfer now, since it can take a week or more.

In early to mid December, execute. Many custodians set internal cutoffs for Roth conversions and certain transfers in the first half of December, so run the conversion and any gain harvesting by then, after the distribution estimates are known. Enroll in your 2027 plan by December 15 for January 1 coverage. Confirm your 2026 72(t) payment has gone out and set up January's automatic transfers. Then make the fourth-quarter estimated payment by January 15, 2027. Arizona tax credit donations for 2026 can wait until April 15, 2027.

Here is how it fits together for a married couple, both 56, who retired last year with $2.6 million: $1.5 million in traditional IRAs and a 401(k) from the employer they left at 55, $800,000 in a taxable account, and $300,000 in Roth IRAs. They spend $110,000 a year, mostly from cash and taxable sales with high basis, and their 2026 dividends and interest total $28,000. They are on ACA coverage with an advance credit worth about $14,000. Staying under the cliff, they convert $50,000, which puts MAGI around $78,000 and leaves a cushion of about $6,600 for surprise distributions. Crossing the cliff to convert $105,000 (up to the top of the 12% bracket) would add $55,000 of conversions at a cost of the $14,000 credit, an extra 25 points on those dollars, so they stay under and plan larger conversions for the years after 65. The figures are illustrative, not a projection.

• Doing a Roth conversion in December without accounting for year-end mutual fund distributions, landing a few hundred dollars over the ACA cliff and repaying the entire advance credit.
• Treating 0% capital gains as free when the gain also counts toward ACA MAGI and can cost more in lost subsidy than the tax it saves.
• Rolling a Rule of 55 401(k) into an IRA for simplicity and losing penalty-free access to that money until 59 1/2.
• Changing a 72(t) payment amount, adding money to the account, or skipping a payment, which retroactively triggers the 10% penalty plus interest on every withdrawal taken under the schedule.
• Paying Roth conversion tax by withholding from the IRA before 59 1/2, which makes the withheld amount a distribution subject to the 10% penalty.
• Moving the whole portfolio to bonds after retiring at 55, even though the money may need to last 40 years or more.
• Skipping estimated payments because there is no paycheck, then owing an underpayment penalty on the tax from a year-end conversion or gain harvest.