12 Money Moves to Make Before Year-End

Marco and Elena Alvarez, two earners with a combined household income of $118,000, live in Denver, CO. Last December they shopped, they traveled, and on January 2nd they discovered they'd left real money on the table — $2,100 in an FSA that evaporated on December 31st, a 401(k) that ended the year $3,500 short of the limit, and a taxable investment loss they never harvested.

This December they're running a checklist instead of a shopping list. Below: their family's actual numbers, 12 moves organized by category, what I'd personally prioritize, and a blank worksheet for your own December.

The Alvarez Family's December Checklist, in Real Numbers

Real figures, all from the IRS's 2026 numbers (Notice 2025-67): 401(k)/403(b)/457 employee deferral limit $24,500; age-50+ catch-up $8,000 ($32,500 total); ages 60–63 super catch-up $11,250 ($35,750 total); IRA limit $7,500, age-50+ catch-up $1,100 ($8,600 total).

Checklist item	Their numbers	Hard deadline
401(k) top-up	Marco is at $21,000 year-to-date; needs $3,500 more across his last 3 paychecks (~$1,167 each) to hit $24,500	Dec 31 — deferrals count only in the calendar year
IRA contribution	Elena funds her full $7,500 traditional IRA in December	Tax day next spring — but she wants it invested now
FSA spend-down	$2,100 left in Marco's health FSA — use-it-or-lose-it; he books the dental crown, Elena orders glasses	Dec 31 (check your employer's grace period)
Tax-loss harvest	Sell a losing index-fund position to realize a $4,000 capital loss against $4,000 of earlier gains	Dec 31; don't rebuy for 31 days (wash-sale rule)
RMD reminder	Marco's 74-year-old father must take his required minimum distribution	Dec 31 — the penalty for missing it is brutal

Their December math: $11,000 into retirement accounts, $2,100 of FSA money rescued instead of forfeited, and a $4,000 loss harvested against $4,000 of gains. Now the full 12-move playbook behind it.

Taxes: Three Moves the IRS Won't Extend

1. Max your 401(k) before the calendar flips

If you've contributed $21,000 like Marco, three paychecks at ~$1,167 each closes the gap to $24,500. Do the math this week — divide your remaining room by your remaining paychecks and file the change with HR now, because payroll takes a pay cycle to process. Age 50 or older? Remember the $8,000 catch-up ($32,500 total) and the $11,250 super catch-up for ages 60–63 ($35,750 total).

2. Harvest losses before December 31

If you sold winners this year, sell losers in your taxable account to offset them — the IRS lets losses cancel gains dollar for dollar. The Alvarez family realized $4,000 of losses against $4,000 of gains. Two rules: the trade must settle by year-end, and the wash-sale rule bars repurchasing the same (or substantially identical) security within 31 days before or after the sale. Don't harvest in your IRA or 401(k) — losses there aren't deductible.

3. Check your withholding so April holds no surprises

Got a raise, a bonus, freelance income, or a second job this year? Pull your last pay stub, compare total withholding against what you'll owe, and adjust your W-4 or make an estimated payment before year-end. Underpayment penalties are entirely avoidable — and December is your last chance to fix the current year.

Retirement: Fund Future You While It Still Counts

4. Do Roth conversions by December 31

Converting traditional IRA money to Roth counts in the tax year the conversion happens — miss December and you miss 2026 entirely. It makes sense when your current tax rate is lower than what you expect in retirement (a low-income year, early retirement, a gap year between jobs). The trade-off: you pay tax on the converted amount now. Our Roth vs. Traditional IRA guide walks through which side wins for you.

5. Fund your IRA — even though you technically have until spring

IRA contributions for 2026 can be made until the tax-filing deadline next spring, so December isn't a hard cutoff like the 401(k). But Elena funds her $7,500 in December anyway: every extra month invested is a month of potential growth, and "I'll do it in March" is how IRAs go unfunded. The 2026 limit is $7,500 ($8,600 if you're 50+).

6. Rebalance and update beneficiaries — the free moves

A year of market movement has drifted your 401(k) and IRA allocations off target. Rebalancing inside retirement accounts costs nothing in taxes — a few clicks. While you're in there, check beneficiaries: they override your will, and an out-of-date one is a slow-motion disaster after a divorce, a new child, or a death in the family.

Insurance & Protection: Don't Lose What You Already Paid For

7. Spend down the FSA (and know it's not an HSA)

Health FSAs are use-it-or-lose-it: unspent balances generally vanish at year-end (some employers offer a grace period or small carryover — check your plan documents today, not December 30th). Marco's $2,100 goes to a postponed dental crown and Elena's new glasses. An HSA is the opposite — its dollars roll over forever, so there's no December panic.

8. Review coverage before open enrollment closes

December is the last call on next year's health plan: compare premiums, deductibles, and whether your doctors are in-network, and pick the FSA/HSA setup that fits next year's medical spending. Beyond health insurance: check life insurance beneficiaries and confirm disability coverage still matches your income.

Debt & Cash: Enter January Lighter

9. Attack high-interest debt before the holidays attack you

Context: the September 15–16, 2026 FOMC raised rates 25 basis points to 3.75%–4.00%, keeping variable-rate debt — including credit cards — expensive. December is the worst month to add to a balance you're carrying. Make an extra payment now, before holiday spending tempts you: every dollar of high-rate debt killed in December is a guaranteed, risk-free return at whatever rate you're paying.

10. Set a hard holiday budget and check the emergency fund

Give holiday spending a written cap — gifts, travel, food, all of it — and track it like any other category (our budgeting methods guide has five systems to pick from). Then glance at the emergency fund: still at target? If 2026 raided it, replenishing it is your first January automation. Starting from zero? Our paycheck-to-paycheck plan shows the exact sequence.

Giving & Planning: Give Smart, Start January Ready

11. Make charitable gifts by December 31

Charitable deductions count in the year the gift is made — a check mailed December 31 counts; one mailed January 2 doesn't. Donating appreciated stock? Start the transfer early: brokerages get swamped in the last week of December. Whether the deduction helps depends on whether you itemize — check this year's IRS rules — but the deadline is December 31 either way.

12. Automate January before December ends

The best year-end move runs itself next year. Set up January's automations now: next year's 401(k) rate, the monthly IRA transfer, the savings sweep the day after payday. Our automation guide covers the exact setup.

What I'd Prioritize (My Honest Ranking)

If I could only do five of these, I'd pick: the 401(k) top-up, the FSA spend-down, the tax-loss harvest, the RMD for the older parent, and IRA funding. The 401(k) top-up is use-it-or-lose-it in the strictest sense — a missed deferral year never comes back, and every dollar saves tax at your marginal rate today. The FSA is literally expiring money. Tax-loss harvesting is free money the tax code hands you, but only before the calendar flips. The RMD isn't optional — the penalty for missing one dwarfs the tax on taking it.

What I'd deprioritize: rebalancing and beneficiary checks. Important, but they have no deadline — January works fine. And the Roth conversion? Only if the math clearly favors it this year; a rushed late-December conversion is how people pay tax they didn't need to pay. Deadlines first, optimization second.

Your December Checklist

Copy this into your notes app and fill in your numbers — the Alvarez family's are just an example.

• ☐ 401(k) top-up: contributed $______ so far; room left $______; ÷ ______ paychecks = $______ per check. HR change filed: ☐
• ☐ IRA contribution: $______ of $7,500 (2026 limit) funded. Transfer scheduled: ☐
• ☐ FSA balance: $______ left — appointments booked: ☐
• ☐ Tax-loss harvest: gains to offset $______; losses to realize $______. Wash-sale calendar checked: ☐
• ☐ RMD (self or parent): amount $______; taken by Dec 31: ☐
• ☐ Withholding check: last pay stub reviewed; W-4 adjusted if needed: ☐
• ☐ Roth conversion: convert $______? Tax impact reviewed: ☐
• ☐ Rebalance + beneficiaries: allocations reset: ☐; beneficiaries current: ☐
• ☐ Insurance review: open enrollment choices made: ☐; beneficiaries checked: ☐
• ☐ High-interest debt: extra payment of $______ made before holiday spending: ☐
• ☐ Holiday budget: cap set at $______; tracked: ☐
• ☐ Charitable gifts: $______ given by Dec 31: ☐
• ☐ January automations: 401(k) rate, IRA transfer, savings sweep all set: ☐

Frequently Asked Questions

What's the real deadline for 2026 retirement contributions?

Two different deadlines. 401(k) deferrals must come out of 2026 paychecks — December 31 is the hard wall. IRA contributions for 2026 can be made until the tax-filing deadline next spring (usually mid-April) — funding now just gets the money invested months earlier.

Does tax-loss harvesting help if I don't itemize?

Yes. Capital losses offset capital gains whether you itemize or take the standard deduction. Even with no gains, you can generally use losses against a limited amount of ordinary income each year and carry the rest forward. Check this year's IRS rules for the exact figures.

I can't max my 401(k). Is bumping it still worth it?

Absolutely. The $24,500 limit is a ceiling, not a target. Every dollar above your employer match still cuts this year's taxable income and grows tax-deferred — Marco's $3,500 top-up captured the full remaining benefit in three paychecks.

What if my employer offers an FSA grace period or carryover?

Then your deadline isn't quite December 31 — but confirm it in your own plan documents, since details vary by employer. The dangerous move is assuming you have a grace period without checking.

Should I do a Roth conversion in December?

Only if the math favors it — a conversion makes sense when your current tax rate is lower than you expect in retirement (a low-income year, early retirement, a gap between jobs). You pay income tax on the converted amount now, so a rushed December conversion at a high bracket can cost more than it saves. Our Roth vs. Traditional guide helps you decide; when in doubt, a tax professional earns their fee here.

Disclaimer: This article is for educational purposes only and is not financial advice. Everyone's taxes, income, and obligations differ — adapt these moves to your situation and consult a financial professional for personalized guidance.