Which year-end financial deadlines genuinely close on December 31, which extend into April, and why custodian cutoffs fall earlier than you think.
Most of the pressure that builds in December comes from treating every item on the year-end list as equally urgent. Very few of them are. Some decisions close permanently at midnight on the 31st, some run well into the following spring, and one of the most consequential ones closes three weeks earlier than everything else.
Sorting them is worth twenty minutes, because what is usually left afterward is three or four real items.
The List That Genuinely Ends
A Roth conversion must be completed within the calendar year, and it cannot be reversed afterward. The recharacterization window that once existed for conversions is gone, which makes the amount a permanent decision rather than one that can be revisited in April.
A required minimum distribution must be taken by December 31 for the year it applies to. There is one exception: a first RMD may be delayed to April 1 of the following year, which then places two taxable distributions in the same tax year. That is sometimes the right choice and more often is not, so it is worth modeling rather than defaulting into.
Qualified charitable distributions must leave the IRA by December 31 to count for the year. The 2026 limit is $111,000 per person, and there is no minimum, so a modest gift works the same way a large one does.
Contributions to a donor-advised fund, annual exclusion gifts of up to $19,000 per recipient, and any sale executed for tax-loss harvesting all belong on this list as well.
The List That Does Not
Traditional and Roth IRA contributions for 2026 can be made until April 15, 2027. Health savings account contributions for 2026 follow the same deadline. Business owners funding a SEP generally have until the extended due date of the return.
A gift tax return, if one is required, is filed with the income tax return the following April rather than at year-end.
One Deadline Comes Earlier Than All of Them
Medicare open enrollment closes on December 7. Anyone reviewing Part D coverage, comparing Advantage plans, or reacting to a change in their prescriptions has a window that shuts nearly a month before the rest of the year-end list.
It is the deadline people most often discover after it has passed, because it does not feel like a tax item and does not appear on tax-oriented checklists.
The Deadline Behind the Deadline
December 31st is the legal date, but it is almost never the practical one.
A gift of securities is complete when the shares are credited to the charity’s account, not when the transfer is requested. That process routinely takes five to ten business days and longer during holiday weeks, since it involves a letter of authorization, the charity’s account details, and two institutions. Mid-December is the practical cutoff, and it is worth confirming the receiving organization’s own deadline directly.
A qualified charitable distribution paid by check must be issued by the custodian and, in most cases, deposited by the organization. Custodians also publish year-end processing cutoffs for conversions and distributions, and those typically fall in the middle of December.
Gifts to family members carry the same issue. A check written on December 30 and deposited on January 3 is a gift made in January, because the rule that relates a gift back to its delivery date requires the check to be deposited within the same calendar year.
For anything that involves moving assets between institutions, the first half of December is the deadline that actually governs.
One More Thing Worth Watching in December
Many mutual funds distribute realized capital gains in December. Buying shares in a taxable account shortly before the record date means receiving a taxable distribution that largely returns your own money to you. Checking a fund’s estimated distribution date before deploying cash late in the year takes two minutes and avoids an unnecessary tax bill.
The Windward Approach
Windward works from a year-round service calendar for exactly this reason. The items that must happen by December 31 get scheduled in October and November, so the last two weeks of the year are spent confirming that things happened rather than starting them.
That rhythm comes from the firm’s CPA heritage. Tax deadlines are not a December event in a tax practice, they are a structure the whole year is built around, and planning works better when it follows the same shape. If you are not sure which list your situation falls on, that is a short conversation and a far better one to have now than on the 29th.
Common Questions
When is the IRA contribution deadline for the 2026 tax year?
April 15, 2027. Unlike Roth conversions and required distributions, IRA and health savings account contributions are not year-end items and can be made well into the following spring.
Can a first required minimum distribution be delayed?
Yes. A first RMD may be delayed until April 1 of the year after you reach the applicable RMD age. Doing so places two taxable distributions in the same tax year, which is worth modeling before choosing it.
What is the real cutoff for a year-end charitable gift of stock?
Earlier than December 31. The gift is complete when the shares are credited to the charity’s account, and that transfer routinely takes five to ten business days. Mid-December is the reliable cutoff, and the receiving organization may set its own.
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