Key Takeaways
- Most 2026 tax moves must happen by December 31, 2026, including 401(k) deferrals and loss harvesting.
- IRA and HSA contributions for 2026 can still go in until April 15, 2027.
- The 2026 401(k) limit is $24,500, plus $8,000 at 50+ or $11,250 at ages 60 to 63.
- Non-itemizers can deduct up to $1,000 ($2,000 married) of 2026 cash gifts to charity.
You can still shrink the tax bill on the 2026 return you’ll file in early 2027, but the clock matters. Most moves have to happen by December 31, 2026. Two of them, IRA and HSA contributions, can wait until April 15, 2027, the day the return is due.
A few years back I owed taxes when I filed, and almost all of it was avoidable with a few moves made earlier in the year. Owing also opens the door to the underpayment penalty, which I think of as a tax on your taxes. Here’s what still works for 2026, and what’s already set for 2027.
Two Deadlines Decide What Still Counts for 2026
Sort every move by its deadline first. Anything tied to your paycheck, your brokerage account or a charity gift has to be done in 2026. Contributions you make yourself to an IRA or HSA get a grace period into the filing season.
| Move | Deadline for 2026 |
|---|---|
| 401(k), 403(b) or TSP deferrals | Last paycheck of 2026 |
| Selling losing investments | December 31, 2026 |
| Charitable gifts and QCDs | December 31, 2026 |
| Year-end gifts to family | December 31, 2026 |
| Traditional or Roth IRA contribution | April 15, 2027 |
| HSA contribution | April 15, 2027 |
If you’re filing in 2027 and just realized you missed the December window, the bottom two rows are the ones still open.
Max Out Your 401(k) Before the Last 2026 Paycheck
This is usually the biggest lever. Every dollar into a traditional 401(k) lowers your 2026 taxable income, and the growth isn’t taxed until you withdraw it. Ask payroll now: a bigger deferral only counts if it comes out of a 2026 paycheck.
| Account | 2026 base limit | Catch-up (50+) | Catch-up (ages 60-63) |
|---|---|---|---|
| 401(k) / 403(b) / TSP | $24,500 | $8,000 | $11,250 |
| Traditional or Roth IRA | $7,500 | $1,100 | n/a |
| HSA (self / family) | $4,400 / $8,750 | $1,000 (55+) | n/a |
For how these limits work across employer plans, see my 401(k), 403(b) and TSP limits comparison.
Example: Mark, 61, has been deferring the standard amount all year. Because he’s in the 60-63 window, he can add the $11,250 super catch-up on top of the $24,500 base, $35,750 in all. If it all goes in pre-tax, his taxable income drops by the same amount.
One wrinkle: starting in 2026, if your wages last year topped $150,000, catch-up dollars must go into the Roth side of the plan. You still get the retirement savings, just not the immediate tax cut on those dollars. My SECURE 2.0 catch-up guide walks through who’s affected.
IRA and HSA Money Can Still Go In During 2027
This is the move most people forget once January arrives. You can make a 2026 traditional IRA contribution any time until April 15, 2027, and deduct it on the 2026 return if you qualify. The same deadline applies to HSA contributions.
Example: Priya, 34, is filing in February 2027 and finds she owes $900. She has an HSA with self-only coverage and only put in $2,000 during 2026. Adding $2,400 before April 15, and telling the HSA custodian it’s for 2026, brings her to the $4,400 limit and lowers her 2026 taxable income by $2,400.
Itemize or Take the Standard Deduction?
For 2026, the standard deduction is $16,100 single or married filing separately, $24,150 head of household and $32,200 married filing jointly. Itemizing only pays when your mortgage interest, state and local taxes, medical costs and giving clear that bar by a real margin.
Most tax software runs both versions and picks the better one. If you’re close, bunching two years of giving into December 2026 can push you over for one year.
Get the 2027 retirement limits by email
The IRS sets next year’s 401(k) and IRA limits in November. I post them, with what they mean for your paycheck, as soon as they’re out.
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Charity: $1,000 Without Itemizing, Plus a New Floor If You Do
The One Big Beautiful Bill (OBBBA) brought back a deduction for non-itemizers, starting with the 2026 tax year. You can deduct up to $1,000 single or $2,000 married filing jointly of cash gifts to qualified charities, even on the standard deduction. It’s a fixed amount, not indexed to inflation.
Itemizers get a new catch instead: only the part of your giving above 0.5% of AGI is deductible.
Example: Sarah has an AGI of $200,000 and gives $3,000 to her church in 2026. Her floor is $1,000 (0.5% of $200,000), so only $2,000 counts if she itemizes. On the standard deduction, she’d claim the flat $1,000 instead.
Whichever route you take, keep a bank record or the charity’s written acknowledgment showing its name, the date and the amount.
Retirees: RMD Timing and QCDs
Get the RMD age right, because it trips people up constantly. Under SECURE 2.0, RMDs start at 73 if you were born from 1951 through 1959, and at 75 if you were born in 1960 or later. A missed or late RMD can cost a real penalty; my RMD rules and deadlines guide covers the dates.
If you’re 70½ or older, a Qualified Charitable Distribution sends money straight from your IRA to a charity. It counts toward your RMD and stays out of taxable income.
The 2026 QCD limit is $111,000 per person, or $222,000 for a married couple who both qualify. You can’t also deduct a QCD on Schedule A.
Harvest Investment Losses by December 31
Selling positions that are underwater offsets gains elsewhere. Past that, it offsets up to $3,000 of ordinary income ($1,500 married filing separately), and any unused loss carries forward with no expiration.
Pull your brokerage’s realized and unrealized gains report before December 31. My capital gains rates breakdown explains how short-term and long-term treatment change the math.
Year-End Gifts to Family: $19,000 Now, $20,000 in 2027
For 2026, you can give $19,000 per recipient, or $38,000 as a married couple splitting gifts, without filing anything. In 2027 the exclusion rises to $20,000 per recipient.
Go over the annual amount for any one person and you’ll usually file Form 709, though no gift tax is due until you use up the much larger lifetime exemption. My estate and gift tax limits guide has the lifetime numbers and how the form works.
Year-End Moves People Get Wrong
Mixing up the RMD and QCD ages. They split apart under SECURE 2.0. RMDs start at 73 or 75 depending on your birth year; QCDs are open at 70½.
Itemizing out of habit. With the standard deduction rising every year, a lot of former itemizers no longer clear the bar. Rerun the math each year.
Skipping the non-itemizer charity deduction. It sounds like the expired COVID-era one, but this version is permanent and separate.
Forgetting the 0.5% floor on a big gift. If you itemize and plan a large donation, run the floor math first so the deduction isn’t smaller than you expected.
Fixing withholding too late. A new job, a house sale or a kid heading to college can leave withholding out of line. The goal isn’t a zero refund at any cost, it’s not handing the IRS an interest-free loan or facing a surprise bill in April.
What Changes for Your 2027 Taxes
Some 2027 numbers are already official. On November 5, 2026 the IRS set the 2027 standard deduction at $16,600 single, $33,200 married filing jointly and $24,925 head of household, and raised the gift exclusion to $20,000.
The 2027 HSA limits are $4,500 self-only and $9,000 family. The full tables are in my 2027 and 2026 tax brackets post.
Still to come: the 2027 401(k), IRA and QCD limits arrive in a separate IRS notice, usually in mid-November. I’ll add them here when they’re out. The OBBBA charity deduction and the senior deduction both carry into 2027, and the senior deduction runs through 2028.
