Tax and Financial Deadlines for 2026 and Early 2027: The Full Calendar

The deadlines that matter most between now and spring are December 31, 2026 for year-end moves, January 15, 2027 for the last 2026 estimated tax payment, and April 15, 2027 for 2026 returns, IRA and HSA contributions, and extensions. Around them sit enrollment windows, tax-form dates, and a set of deadlines that start when something happens to you rather than on a calendar date: an equity grant, a rollover, an inheritance, a 65th birthday.

When a federal tax date falls on a weekend or legal holiday, it moves. In the words of IRS Publication 509, “the act is considered to be performed timely if it is performed no later than the next day that isn’t a Saturday, Sunday, or legal holiday.” The dates below already reflect that rule. Federally declared disasters can also postpone deadlines for affected areas; check IRS disaster relief if that applies to you.

What are the tax and financial deadlines from October 2026 to April 2027?

Two of those dates moved. Employers owe you a W-2, and companies owe you Form 3921 (for an ISO exercise) or Form 3922 (for an ESPP purchase), by January 31, which is a Sunday in 2027. Brokers owe 1099-B statements by February 15, which is Washington’s Birthday, a federal holiday. Do not plan to file before your consolidated brokerage statement arrives, and expect that a broker may send a corrected one later.

State filing dates, state estimated payments, and employer open enrollment vary. Employer open enrollment usually runs in the fall on dates your employer sets, and it is often the only time each year you can change your health plan, FSA, or dependent-care election.

What has to be done by December 31, 2026?

Anything that has to happen inside the 2026 tax year. Contributions that can be made after year-end are the exception, not the rule.

A few of these deserve detail.

RMDs. Under the IRS RMD rules, “for each year after your required beginning date, you must withdraw your RMD by December 31.” Waiting until April 1 for a first RMD means two distributions in the same tax year. A missed RMD carries a 25% excise tax on the shortfall, reduced to 10% if you correct it within two years, per the IRS RMD FAQs. The RMD calculator estimates this year’s amount.

Loss harvesting. A sale on December 28 counts for 2026, but buying the same or a substantially identical security through January 27 can disallow the loss under the wash-sale rule in IRS Publication 550. Check dividend reinvestment and any IRA purchases too. Tax-loss harvesting walks through the window.

Roth conversions. Since 2018 a conversion cannot be recharacterized, per IRS Publication 590-A, so model the tax before you convert. If you do a backdoor Roth, the pro-rata math uses your traditional, SEP, and SIMPLE IRA balances on December 31 of the conversion year, so a rollover into an IRA late in the year can make part of the conversion taxable.

Charitable gifts. IRS Publication 526 says contributions “charged on your bank credit card are deductible in the year you make the charge,” and a stock certificate counts on the date it is mailed or delivered. Brokerage transfers of shares can take days, so start them in early December. The 2026 changes to charitable deductions, including the new 0.5% of AGI floor for itemizers, are covered in 2026 tax changes.

529 plans. The deadline depends on your state. Wisconsin’s Schedule CS instructions, for example, accept contributions for a tax year through April 15 of the following year. Check your own state’s plan before assuming you have until spring.

FSAs. For 2026 plan years, Rev. Proc. 2025-32 caps health FSA salary reductions at $3,400 and carryovers at $680. Starting in 2026, the dependent-care FSA limit rose to $7,500 under 26 U.S.C. 129, so check the amount you elect in open enrollment.

When are 2026 estimated tax payments due?

Form 1040-ES sets four dates: April 15, June 15, and September 15, 2026, and January 15, 2027. The form adds: “You don’t have to make the payment due January 15, 2027, if you file your 2026 tax return by February 1, 2027, and pay the entire balance due with your return.” Few people with K-1s or a late 1099-B can file that early, so plan on the January payment.

You avoid the underpayment penalty by paying at least 90% of your 2026 tax or 100% of your 2025 tax through withholding and estimates. If your 2025 AGI was over $150,000 ($75,000 married filing separately), the second figure is 110%.

Here is what that looks like after a stock sale. Say you sold shares in September 2026 for a $150,000 long-term gain. At a 15% capital gains rate plus the 3.8% net investment income tax, that adds $28,200 of tax, and none of it was withheld. If your 2025 tax was $60,000 and your 2025 AGI was over $150,000, your safe harbor is $66,000 regardless of the gain. If your 2026 withholding is on track for only $58,000, a January 15 estimated payment covers the last quarter but leaves the first three short. Adding $8,000 of federal withholding to a December paycheck or bonus covers all four, because withholding counts as paid evenly through the year. You still owe the rest of the tax on the gain by April 15, but you avoid the penalty. When income arrives late in the year, the annualized income method on Form 2210 Schedule AI can also lower the required early payments.

What is the deadline for 2026 IRA and HSA contributions?

April 15, 2027. Per IRS Publication 590-A, IRA contributions can be made “by the due date for filing your return for that year, not including extensions.” An extension to October does not give you more time. HSA contributions for 2026 follow the same April 15, 2027 deadline under IRS Publication 969.

The 2026 limits are $7,500 for an IRA ($8,600 at 50 or older) and $4,400 self-only or $8,750 family for an HSA, plus $1,000 at 55 or older. When you contribute between January 1 and April 15, tell the custodian which year the money is for.

SEP IRA contributions are different: you can make them up to the return due date including extensions, so an extended 2026 return gives you until October 15, 2027. See SEP IRA rules.

If you changed jobs in 2026, add up your 401(k) deferrals at both employers. The $24,500 limit is per person, not per plan, and neither payroll can see the other. Excess deferrals must be paid back out by April 15, 2027, a deadline the IRS says “is not postponed by extending the filing of the employee’s federal income tax return.”

Which deadlines start with an event instead of a date?

These run from the day something happens to you. No calendar reminds you, which makes them easy to miss.

83(b). The 30 days start at transfer, not vesting. Since July 2025 the IRS has accepted Form 15620 online. How to file an 83(b) election covers the steps.

Rollovers. The IRS rollover rules require 20% withholding when a plan pays you directly, so rolling over the full amount means adding the withheld 20% from other cash within the 60 days. A direct trustee-to-trustee transfer avoids both the withholding and the clock.

Inherited IRAs. If the original owner had already reached their required beginning date, final regulations also require annual distributions in years one through nine, per the IRS. Notice 2024-35 applied those rules starting in 2025. Spouses, minor children, disabled or chronically ill beneficiaries, and those no more than 10 years younger than the owner follow different rules.

Health coverage. The 30-day minimum comes from the HIPAA special enrollment rules in 29 CFR 2590.701-6; your plan may allow longer. The 60-day Marketplace window is on HealthCare.gov.

Medicare. The initial enrollment period runs from 3 months before the month you turn 65 to 3 months after it. The Part B penalty lasts as long as you have Part B, though coverage through your own or a spouse’s current job can qualify you for a special enrollment period instead, per Medicare.gov.

RMD age. Under 26 U.S.C. 401(a)(9)(C)(v), the applicable age is 73 for anyone born from 1951 through 1959 and 75 for anyone born in 1960 or later. The home sale tests are in IRS Topic 701.

How Nino tracks life-event deadlines

Nino asks what is changing in your life and keeps your answer in your own words. On each scheduled check, a model reads those words against the day you gave them and checks whether they describe one of seven events within 12 months of today: a wedding, a new child, a new job, a move to another state, a home sale, a retirement, or a large stock sale. Something you only describe as a possibility, or with no timing, does not count, and anything touching a death, a divorce, an illness, or another loss never produces a card.

When an event matches, Nino quotes it back and names the rule and the next step: the 30-day window to add a baby to your health plan, the per-person 401(k) limit after a job change, the safe harbor after a stock sale. Those rules are fixed text checked against primary sources such as IRS publications, HealthCare.gov, and Medicare.gov, and a second model reviews each card for your situation before you see it.

On Advisor plans, from $3,600 a year, a CFP and CPAs plan around these dates with you, and federal and state filing is included. Nothing is filed until you approve it. See how the work runs, or book a free consultation if a deadline above applies to you this year.