Some money decisions have deadlines at the end of the year. Others can wait until the tax-filing deadline next spring. This checklist explains the rules for tax year 2026 so you know which is which. It does not tell you which actions are right for you.
Covers U.S. federal rules for tax year 2026. State rules may differ. Last reviewed: October 2026.
Key deadlines
Your employer or financial institution may require an earlier processing date, so check with them rather than waiting until the last day.
By December 7, 2026
Medicare open enrollment changes
By December 31, 2026
Workplace plan contributions, such as 401(k) and 403(b)
Required minimum distributions (except a first one, which can be delayed until April 1, 2027)
Roth conversions
Qualified charitable distributions
Sales of investments to realize gains or losses
Flexible spending account balances, unless your plan allows a carryover or grace period
By January 15, 2027
Fourth-quarter estimated tax payment for 2026
By the April 2027 tax-filing deadline
IRA contributions for 2026
Health Savings Account contributions for 2026
Choose “Help me understand” or “Show explanation” to see the rule, the 2026 figures, and a link to the official source. Mark where you stand, and the summary at the end will list what you are still working on. Your answers are not saved or sent anywhere.
Retirement contributions
Withdrawals and conversions
Investments and taxes
Health and benefits
Where you stand
0Yes0Working on it0Help me understand0Does not apply14Not answered
The rules and figures on this page are for tax year 2026. They change each year, and many depend on your income and filing status. A tax professional can help you apply them to your own situation.
What would you like to understand better? Tell me here.
This checklist is for general education only and is not personal financial, tax, legal, or investment advice. Figures are for tax year 2026, as published by the IRS and Medicare. Confirm current details with the official sources linked.