10 Money Moves to Make Before December 31: Your Q4 Financial Checklist

The best money moves to make before December 31, 2026, are the ones with hard year-end deadlines: maxing out your 401(k), spending down your FSA, harvesting investment losses, timing charitable gifts under the new 2026 rules, taking any required distribution, and re-shopping health coverage. This Q4 financial checklist covers all 10, with 2026 limits and real numbers.

Key Takeaways: The 2026 401(k) limit is $24,500 ($32,500 at 50+), and deferrals must come from 2026 paychecks.Unused FSA money is lost unless your plan offers a carryover (up to $680) or grace period.New for 2026: standard-deduction filers can deduct up to $1,000 ($2,000 married) in cash gifts to charity.Top high-yield savings accounts pay up to about 4.25% APY vs. a 0.37% national average.Medicare open enrollment ends December 7; ACA sign-ups by December 15 start coverage January 1.

Why does Q4 matter so much for your money?

As of October 5, there are 87 days left in 2026. That’s about six biweekly paychecks to fix your retirement savings, and FSA balances, tax-loss trades, RMDs, and year-end gifts all lock on December 31. Miss them and the chance is gone until 2027, or for good.

Most of these moves take 10 to 30 minutes. Let’s go.

Which year-end money moves cut your 2026 taxes?

1. Bump Your 401(k) Before Your Last 2026 Paycheck

How It Works: The 2026 limit is $24,500, or $32,500 at 50+, and $35,750 for ages 60 to 63 (IRS). Only 2026 paychecks count, so December 31 is a hard stop.

Real Example: You earn $70,000, get paid biweekly, and contribute 6%. Raising it to 10% for the last six paychecks adds about $108 per check, or $646 more invested.

Estimated Savings: About $142 off your 2026 federal taxes in the 22% bracket, plus any match you were missing.

Best For: anyone with a workplace plan. Skip the bump if you carry high-interest debt with no emergency fund (keep the match).

Action Step: Raise your contribution rate in your payroll portal today. Changes can take one or two pay cycles.

2. Spend Down Your FSA So You Don’t Forfeit It

How It Works: A health flexible spending account (FSA) pays medical costs with pre-tax money, use-it-or-lose-it style. The 2026 limit is $3,400. Plans may allow a carryover of up to $680 or a grace period of up to two and a half months, never both, and some offer neither (IRS, via OneDigital).

Real Example: You have $520 left and no carryover. It vanishes December 31 unless you spend it on glasses, contacts, dental copays, or over-the-counter medicine.

Estimated Savings: Up to 100% of your leftover balance, money already taken from your paycheck.

Best For: anyone with a 2026 FSA. Skip the spree if your balance is under your plan’s carryover amount.

Action Step: Check your balance and deadline this week, then book eye or dental visits.

3. Top Up Your HSA Through Payroll

How It Works: A health savings account (HSA) is a tax-advantaged account for people on a high-deductible health plan (HDHP). The 2026 limits are $4,400 self-only and $8,750 family, plus $1,000 at 55+. The deadline is April 15, 2027, but only payroll contributions skip 7.65% FICA tax.

Real Example: With family coverage and $4,750 of room left, routing $1,000 more through payroll skips income tax and FICA.

Estimated Savings: About $297 per $1,000 in the 22% bracket (22% income tax plus 7.65% FICA).

Best For: HDHP enrollees. Skip this if your plan isn’t HSA-qualified or you’re on Medicare.

Action Step: Raise your per-paycheck HSA amount now.

4. Harvest Tax Losses (or Tax-Free Gains)

How It Works: Tax-loss harvesting means selling a losing investment in a taxable account. Losses offset gains, then up to $3,000 of ordinary income, and the rest carries forward (IRS). Trades must happen by December 31, and the wash-sale rule voids the loss if you buy a substantially identical investment within 30 days before or after.

Real Example: A $4,000 loss erases a $4,000 long-term gain you took this year. Flip side: if 2026 taxable income stays under $49,450 (single) or $98,900 (married filing jointly), long-term gains are taxed at 0%, so consider harvesting gains instead (Kiplinger).

Estimated Savings: $600 in this example at the 15% long-term rate.

Best For: taxable brokerage investors. Skip this if you only invest inside a 401(k) or IRA.

Action Step: Open your unrealized gain and loss view, flag losers, and pick a similar (not identical) fund to swap into.

5. Time Your Charitable Giving for the New 2026 Rules

How It Works: If you take the standard deduction ($16,100 single, $32,200 married), you can now deduct up to $1,000 ($2,000 married) in cash gifts to qualified public charities on top of it. Itemizers only deduct giving above 0.5% of adjusted gross income (AGI) (CharityWatch).

Real Example: A married couple on the standard deduction gives $1,500 to a food bank in December, and all of it is deductible. An itemizer with $100,000 of AGI loses the first $500, so bunching gifts helps.

Estimated Savings: $180 for that couple in the 12% bracket, or $220 for a single filer giving $1,000 in the 22% bracket.

Best For: standard-deduction filers who already give. Heads up: donor-advised fund gifts don’t qualify for the non-itemizer deduction.

Action Step: Give by December 31 and get a written receipt for any gift of $250 or more.

6. Take Your RMD, or Send It to Charity Tax-Free

How It Works: A required minimum distribution (RMD) is the yearly withdrawal required from traditional IRAs and 401(k)s starting at age 73. Missing it triggers a 25% excise tax on the shortfall, cut to 10% if fixed promptly (IRS). At 70½ or older, a qualified charitable distribution (QCD) sends IRA money straight to charity, counts toward your RMD, and stays out of taxable income, up to $111,000 in 2026.

Real Example: Your RMD is $20,000, and you give $5,000 a year to your church. Sending that $5,000 as a QCD means only $15,000 counts as income.

Estimated Savings: $1,100 in the 22% bracket, plus a lower AGI.

Best For: retirees 73+. Note: a first RMD can wait until April 1, 2027, but then two land in one tax year.

Action Step: Call your IRA custodian before mid-December, ahead of their internal cutoffs.

Which Q4 moves protect your health, cash, and family?

7. Re-Shop Your Health Coverage During Open Enrollment

How It Works: Medicare open enrollment runs October 15 to December 7, 2026 (CMS). ACA marketplace enrollment runs from November 1, 2026, to January 15, 2027, with a December 15 cutoff for January 1 coverage. Employer windows vary.

Real Example: Compare total yearly cost. Plan A at $300 a month with a $1,000 deductible costs $4,600 if you hit the deductible. Plan B at $150 a month with a $2,000 deductible costs $3,800 (illustrative numbers).

Estimated Savings: $800 a year in this example, before HSA tax savings.

Best For: anyone whose health, family, or job changed. Skip a switch if your doctors are out of network.

Action Step: Pull your 2026 medical spending and compare two plans side by side.

8. Move Idle Cash Into a High-Yield Savings Account

How It Works: A high-yield savings account (HYSA) is an FDIC-insured account that pays far more than a traditional bank. The national average is 0.37%, while top accounts pay about 3% to 4.25% APY as of October 2, 2026 (Yahoo Finance, citing FDIC data).

Real Example: CIT Bank Platinum Savings pays up to 4.25% APY on $5,000+, SoFi up to 4% with direct deposit, and Ally 3%.

Estimated Savings: $10,000 earns about $37 a year at 0.37% versus about $400 at 4%, roughly $90 extra in Q4 alone.

Best For: emergency funds and holiday buffers. Skip this for long-term money. Rates are variable.

Action Step: Open an account this week and automate a transfer. [AFFILIATE LINK: High-Yield Savings Partner]

9. Use the Benefits That Reset on January 1

How It Works: Your deductible, use-it-or-lose-it PTO, card credits, and tuition benefits reset December 31. Employers can provide up to $5,250 in tax-free educational assistance in 2026 (IRS, via OneDigital).

Real Example: You’ve met a $2,000 deductible. A $600 procedure in December might cost only 20% coinsurance, or $120. In January the deductible resets, and you could pay all $600 (illustrative; check your plan).

Estimated Savings: $480 in this example, plus whatever unused PTO and perks are worth.

Best For: anyone who hits a deductible. Skip this if it means booking care you don’t need.

Action Step: Check deductible progress, PTO rules, and unused card credits today.

10. Make Year-End Gifts and 529 Contributions Count

How It Works: The annual gift tax exclusion lets you give up to $19,000 per person in 2026 without a gift tax return, or $38,000 per recipient for married couples who split gifts (IRS Rev. Proc. 2025-32). Unused exclusion doesn’t carry over. A 529 plan is a tax-advantaged college savings account, and many states require contributions by December 31 for a state tax break.

Real Example: Grandparents could put $38,000 into a grandchild’s 529 in December and $38,000 more in January, using two years of exclusions in one month.

Estimated Savings: Varies by state. Some states deduct 529 contributions, and growth used for qualified education is federally tax-free.

Best For: parents and grandparents. Skip this until your emergency fund and retirement match are covered.

Action Step: Check your state’s 529 deadline and contribute by mid-December.

What are the Q4 2026 money deadlines? (Q4 Deadline Tracker)

Move	Hard Deadline	2026 Key Number	Estimated Value*	Effort
1. 401(k) bump	Last 2026 paycheck	$24,500 ($32,500 at 50+)	$100 to $500+ tax cut	Easy
2. FSA spend-down	Dec 31 or plan grace date	$680 max carryover	Your full leftover balance	Easy
3. HSA top-up	Apr 15, 2027 (payroll by Dec 31)	$4,400 / $8,750	~$297 per $1,000 via payroll	Easy
4. Tax-loss harvest	Dec 31 trade date	$3,000 income offset	$300 to $1,000+	Medium
5. Charitable gifts	Dec 31	$1,000 / $2,000 non-itemizer	$100 to $440	Easy
6. RMD or QCD	Dec 31	QCD up to $111,000	Avoids 25% penalty	Medium
7. Health plan switch	Dec 7 (Medicare), Dec 15 (ACA)	Varies by plan	$500 to $2,000	Medium
8. HYSA move	Anytime (sooner earns more)	Up to ~4.25% APY	~$90 per $10,000 per quarter	Easy
9. Reset benefits	Dec 31	$5,250 tuition aid	$100 to $1,000+	Easy
10. Gifts and 529s	Dec 31	$19,000 per recipient	State tax break varies	Medium

*Illustrative ranges based on the examples above. Results vary by income, state, and plan.

The 87-Day Money Sprint: Level Up Beginner: Knock out moves 1, 2, and 8 this week (under 30 minutes).Pro: Add moves 4, 7, and 9 before Thanksgiving.Expert: Check off all 10 by December 15, then screenshot your finished checklist.Your turn: Which move are you tackling first? Drop the number in the comments.Tag a friend who forfeited their FSA money last year. Don’t let it happen twice.

Quick Wins Total Potential Savings: $500 to $3,000+ in taxes, interest, and saved benefits for a household completing five or more moves (estimate)Time Investment: 2 to 4 hours spread across Q4Difficulty: Easy to Medium Best For: Workers with benefits, investors, retirees, and savers

Frequently Asked Questions

Q: What money moves should I make before the end of the year?

A: Focus on moves with December 31 deadlines: raise your 401(k) contribution, spend down your FSA, harvest tax losses, make charitable gifts, and take any required minimum distribution. Then re-shop health coverage and move idle cash to a high-yield savings account.

Q: What is the deadline to contribute to a 401(k) for 2026?

A: The deadline is your last 2026 paycheck, with a $24,500 limit ($32,500 at 50+). IRA and HSA contributions for 2026 can still be made until April 15, 2027.

Q: Does unused FSA money roll over to 2027?

A: Unused FSA money rolls over only if your plan offers a carryover, capped at $680 for 2026, or a grace period of up to two and a half months. Check your plan rules before December 31.

Q: Can I deduct charitable donations in 2026 if I don’t itemize?

A: Yes. Starting in 2026, standard-deduction filers can deduct up to $1,000 ($2,000 married filing jointly) in cash gifts to qualified public charities, excluding donor-advised funds.

Q: When is the deadline for tax-loss harvesting in 2026?

A: The deadline for tax-loss harvesting in 2026 is December 31, based on the trade date. Don’t buy a substantially identical investment within 30 days before or after, or the wash-sale rule voids the loss.

Start Your Q4 Financial Checklist TodayGrab the fastest win first: move your holiday cash into a high-yield savings account paying up to about 4.25% APY and let it earn while you shop. [AFFILIATE LINK: High-Yield Savings Partner]Then download our free printable Q4 financial checklist and check off one move a week until December 31. [LINK: Q4 Checklist Download]