The start of the fourth quarter gives households roughly 90 days to review financial decisions that may need attention before year-end. Retirement-plan contributions, FSA balances, estimated taxes, charitable giving, and taxable investment activity can all involve deadlines or timing considerations. Beginning the review on October 1 can provide more time to identify what still needs to happen before December 31.
Why Start Year-End Planning in October?
By October, much of the financial year has already occurred.
Households may have:
- Nine months of payroll data
- Bonuses already received
- RSUs or other equity compensation that has vested
- Realized investment gains and losses
- Retirement contributions made through several payroll periods
- Three estimated-tax payment periods behind them
At the same time, several important decisions may still need to be completed before year-end.
That makes October a useful point to compare what has already happened with what still needs attention.
1. Check 2026 Retirement-Plan Contributions
For 2026, the employee elective-deferral limit for most 401(k), 403(b), and governmental 457 plans is $24,500.
Eligible participants age 50 and older may generally make an additional $8,000 catch-up contribution, while eligible participants ages 60 through 63 may have a higher $11,250 catch-up limit, subject to plan rules.
Certain higher-paid participants are also subject to the new Roth catch-up requirement beginning in 2026.
Review:
- Contributions made year to date
- Remaining contribution capacity
- Number of payroll periods remaining
- Expected bonuses
- Catch-up eligibility
- Whether the Roth catch-up requirement applies
- Employer-plan processing deadlines
Contribution limits establish what may be permitted under the plan. They do not determine what contribution level is appropriate for every household.
Starting the review in October may provide more time to make payroll adjustments if needed.
2. Review FSA Balances and Plan Rules
Health Flexible Spending Arrangements generally operate under a use-it-or-lose-it framework, although employer plans may offer certain exceptions.
Depending on the plan, unused funds may qualify for a limited carryover or a grace period. Plans are not required to offer either feature, and specific deadlines can vary.
Review:
- Current FSA balance
- Eligible expenses already incurred
- Reimbursement claims that have not yet been submitted
- Whether the plan permits a carryover
- Whether the plan provides a grace period
- The final date for incurring and submitting eligible expenses
For 2026, the health FSA salary-reduction contribution limit is $3,400, with up to $680 potentially eligible for carryover when permitted by the employer’s plan.
The most important dates are the ones contained in the specific plan documents.
3. Update Estimated-Tax Assumptions
The fourth 2026 federal estimated-tax installment for calendar-year taxpayers is generally due January 15, 2027.
Even though that date falls after December 31, Q4 is an important time to review whether the assumptions behind estimated taxes still reflect the year that actually occurred.
Consider:
- Federal withholding to date
- Estimated-tax payments already made
- Bonuses received or expected
- RSUs or other equity compensation
- Business or consulting income
- Realized capital gains
- Interest and dividends
- Spouse’s income
- Other income that may not have withholding attached
For certain higher-income taxpayers, estimated-tax planning may also involve reviewing the 110% prior-year safe-harbor rule.
Remember that satisfying an estimated-tax safe harbor generally addresses potential underpayment penalties. It does not necessarily mean the household’s entire current-year tax liability has already been covered.
4. Review Charitable Contributions Before Year-End
Charitable gifts intended for the 2026 tax year generally need to be completed by December 31, 2026, subject to applicable tax and substantiation rules.
The timing can matter, particularly when gifts involve investments or other non-cash assets rather than a simple cash contribution.
Review:
- Charitable gifts already made
- Additional giving planned before year-end
- Cash versus appreciated-property contributions
- Charities being considered
- Required documentation
- Processing time for securities or other assets
- How the 2026 charitable-deduction rules may apply
For 2026, qualifying taxpayers who do not itemize may generally be eligible for a deduction for certain cash charitable contributions of up to $1,000, or $2,000 for married couples filing jointly, subject to applicable rules.
Taxpayers who itemize should also be aware of changes to the charitable-deduction framework beginning in 2026.
The tax consequences should generally be considered alongside the household’s charitable objectives rather than becoming the sole reason for making a gift.
5. Review Taxable Investment Activity
The end of the calendar year also closes the tax year for most individual investors.
Review taxable accounts for:
- Short-term realized gains
- Long-term realized gains
- Realized losses
- Expected year-end capital-gain distributions
- Concentrated positions
- Shares received through RSU vesting
- Securities that may be sold for liquidity or diversification
Tax consequences should generally be understood before an investment transaction is completed.
But taxes should not necessarily determine the investment decision by themselves.
For example, holding a concentrated position solely to avoid realizing a capital gain may reduce the immediate tax impact while maintaining significant exposure to one investment.
Investment decisions should generally be evaluated alongside risk, liquidity needs, time horizon, and the broader financial plan.
A Practical Q4 Checklist
During the final 90 days of the year, consider confirming:
- 2026 retirement-plan contributions are on track
- Catch-up eligibility has been reviewed
- FSA balances and plan-specific deadlines are understood
- Expected 2026 income has been updated
- Estimated-tax assumptions reflect current income
- Bonuses and equity compensation are included
- Planned charitable contributions have enough time to be completed
- Realized investment gains and losses have been reviewed
- Major financial transactions expected before December 31 have been identified
- Tax decisions are being considered alongside investment, retirement, and cash-flow goals
Not every household will need to act on every item.
The purpose of the review is to identify which decisions may require additional analysis while there is still time to address them.
How Does Falcon Wealth Planning Approach Q4 Planning?
Falcon Wealth Planning is a Fee-Only fiduciary Registered Investment Adviser. Our CFP® professionals and CPAs work with clients to coordinate investment management with retirement planning, tax planning, estate considerations, charitable planning, and cash-flow decisions.
For households with multiple financial priorities, a Q4 review may provide an opportunity to evaluate year-end deadlines and decisions together rather than addressing each one separately.
The appropriate planning strategy depends on each family’s circumstances, goals, income, and tax situation.
Frequently Asked Questions
What is the 401(k) contribution limit for 2026?
The employee elective-deferral limit for most 401(k) plans is $24,500 in 2026, with additional catch-up contributions potentially available to eligible participants.
Do unused FSA funds always expire on December 31?
No. Some employer plans permit a limited carryover or grace period. The specific plan rules and deadlines should be reviewed before assuming unused funds will be forfeited.
Is the final 2026 estimated-tax payment due before December 31?
No. The fourth federal estimated-tax installment for calendar-year taxpayers is generally due January 15, 2027. However, reviewing the calculation during Q4 can help incorporate income and tax payments from the full year.
Do charitable contributions need to be completed before year-end?
Generally, contributions intended for the 2026 tax year need to be completed by December 31, 2026, subject to applicable tax and substantiation requirements.
Schedule a No-Cost Financial Assessment
The final quarter can bring retirement, tax, investment, and charitable decisions together quickly. A No-Cost Financial Assessment can help determine whether Falcon Wealth Planning’s coordinated fee-only fiduciary approach may be appropriate for your family’s financial needs.
Disclosure
This article is provided for general educational and informational purposes only and does not constitute individualized investment, tax, legal, or employee-benefits advice. Contribution limits, tax rules, and employer-plan provisions depend on individual circumstances and may change. Consult appropriately qualified financial, tax, legal, and benefits professionals before implementing any strategy. Falcon Wealth Planning, LLC is a fee-only fiduciary Registered Investment Adviser.
