Just as every season brings change to nature, the final quarter brings a familiar shift in financial planning: headlines get louder, calendars get shorter, and seemingly small decisions can have outsized tax consequences.
Watching my wife tend to her garden has taught me that good results rarely come from last-minute attention. There's pruning to do, things to protect, and a little preparation before winter arrives. Financial planning isn't so different. It's less about predicting the markets and more about making sure the basics are in place before the season changes.
Below is a checklist to help you identify which conversations are worth having before December 31. Not every item applies to every household, but most families will find at least a few meaningful opportunities.
The December 31 checklist: 6 Smart Moves to Review
1) Review realized gains and losses (before you run out of runway)
Before making year-end investment decisions, take a look at what has already happened in your taxable accounts.
One strategy worth considering is tax-loss harvesting, which means selling an investment at a loss to potentially offset capital gains realized elsewhere in your portfolio. It's one of those “quiet competence” strategies: rarely flashy, often useful.
A few things to keep in mind:
- Review realized gains and losses. If you sold investments at a gain this year, realized losses elsewhere in your portfolio may help reduce the taxable impact.
- Consider potential tax benefits. If capital losses exceed gains, up to $3,000 may generally be deductible against ordinary income ($1,500 if married filing separately), with remaining eligible losses carried forward.
- Watch the wash-sale rule. Buying the same or a substantially identical investment within 30 days before or after a loss sale may prevent you from claiming that loss for the current year.
- Keep your investment strategy in mind. Consider whether selling a position and reinvesting in an appropriate alternative makes sense for your long-term plan.
Sometimes the most valuable outcome of a year-end review is confirming that your current strategy still makes sense.
After all, a tax benefit should support your investment plan, not drive it.
2) Maximize workplace retirement contributions (and don’t miss the match)
If you contribute to a 401(k) or 403(b), year-end is a good time to confirm you’re on pace with your savings goals.
Contribution limits and catch-up rules can change over time, so it’s wise to confirm the current-year maximums (and your plan’s specific rules). A few items worth checking:
- How the employer match works. Some employers match contributions each pay period and may also make a year-end adjustment, known as a “true-up,” to ensure you receive the full match you're eligible for under the plan.
- Whether you can still adjust deferrals. If cash flow allows, increasing deferrals during your remaining paychecks may help you move closer to your annual target.
- Different accounts have different deadlines. Workplace plan deferrals typically follow payroll timing, while IRA contributions may have a later deadline, subject to eligibility.
For pre-retirees, this step can be doubly helpful: building retirement readiness while potentially managing current-year taxes (depending on the type of contribution and your situation).
And don’t overlook the employer match. It’s one of those benefits that’s easy to take for granted—until you realize you didn’t fully use it.
3) Rebalance portfolio drift (especially after a volatile year)
Market movement can nudge a diversified portfolio out of alignment—sometimes subtly, sometimes not.
- Compare your current allocation with your intended targets.
- Look for meaningful drift in major asset categories, such as stocks, bonds, and cash.
- Consider tax consequences before rebalancing inside taxable accounts.
- Confirm your mix still reflects your goals, time horizon, and comfort with risk.
Rebalancing is less about “calling the top” and more about maintaining the risk level you intentionally chose.
For retirees taking distributions, rebalancing can also connect to cash-flow planning—deciding which accounts and holdings may be best suited to fund spending.
4) Confirm you’ve satisfied RMD requirements (if applicable)
If required minimum distribution (RMD) rules apply to you, year-end is the time to double-check that you’re not unintentionally inviting an avoidable penalty.
RMD rules can vary by age, account type, and whether the account was inherited, so this is a “measure twice, cut once” category.
Consider reviewing:
- Whether you must take an RMD this year.
- The amount and timing, especially if you have multiple retirement accounts.
- Whether any distributions were already completed.
- If you’re charitably inclined, whether a qualified charitable distribution (QCD) could be a fit when eligible.
Most annual RMDs must be completed by December 31, although certain first-year distributions and other situations may have different deadlines. Because the consequences of missing an RMD can be significant, this is one place where “we’ll handle it next week” can become “we should have handled it last month.”
5) Check your charitable and gifting plan (and document it)
If charitable giving is part of your family's values, December is often when intentions turn into action.
Year-end is a good time to review not only how much you’d like to give, but how you’re giving.
- Make sure donations are completed within applicable deadlines and that documentation is retained.
- Consider whether donating appreciated securities instead of cash may be appropriate for your situation.
- If gifting to family, confirm logistics and any tax reporting considerations.
- Coordinate charitable giving with retirement distributions when appropriate.
A little planning can help your generosity align with both your values and your broader financial picture.
6) Review withholding and estimated taxes (to reduce surprises)
A year with bonuses, a home sale, sizable investment gains, retirement distributions, or changing income can create a mismatch between what you owe and what you’ve already paid.
A year-end tax check-in can help you spot issues early:
- Review significant changes in income.
- Consider whether investment sales or distributions may affect your tax liability.
- Check whether withholding or estimated tax payments need attention.
- Coordinate with your tax professional before making adjustments.
Aligning withholding and estimated payments isn’t glamorous—but it can be the difference between a calm filing season and an unpleasant April.
Why waiting until late December is a mistake
There’s a particular kind of holiday stress that comes from trying to do too much with too few business days.
Starting earlier tends to work better because:
- Trades and transfers take time. Settlement periods and administrative cutoffs are real—even in a digital world.
- Good decisions need breathing room. Tax strategy should support your long-term plan, not override it.
- Coordination matters. Investment strategy, tax planning, charitable giving, and retirement distributions overlap. Late decisions made in isolation can create unintended consequences.
A good financial plan should reduce unnecessary stress—not add to it.
A simple next step
If you’d like to get a head start on year-end planning, gather three items:
- Your most recent investment and retirement account statements.
- Your year-to-date realized gains and losses report (if available).
- A rough estimate of any significant income or financial changes this year.
With those pieces, a year-end planning conversation can often clarify which checklist items matter most—and which can safely be set aside.
You don’t necessarily need to make major changes before December 31. Sometimes the best outcome is simply knowing that the right pieces are already in place.
Markets will do what they do, like weather. Year-end planning is where we get to be the steady hand—quietly preparing, pruning, and positioning—so that when spring returns, your plan is ready for it.
If you'd like another set of eyes on your year-end financial picture, a conversation now may help you identify what deserves attention before the calendar turns.
This article is for informational purposes only and is not tax or legal advice. Consult your tax professional regarding your specific situation.