A handful of well-chosen financial moves before December 31 can meaningfully reduce taxable income, strengthen long-term security, and set up the year ahead. Most people do not need a long checklist. They need to focus on the few decisions that actually move the needle.
Five Year-End Tax Moves That Make a Difference
1. Maximize Retirement Contributions
Reviewing how close you are to annual contribution limits before year-end is one of the highest-impact financial moves available. For 401(k), 403(b), 457, and Solo 401(k) plans, increasing contributions in the final pay periods can lower taxable income through pre-tax accounts or build long-term tax-free growth through Roth accounts. Catch-up contributions are available for those 50 and older.
For business owners and self-employed individuals, a Solo 401(k) generally needs to be established by December 31 to make salary-deferral contributions for the year. This deadline is worth confirming with a CPA if a new plan is being considered.
2. Make Charitable Gifts Before December 31
For those who itemize deductions, charitable contributions made before year-end can reduce taxable income. Two approaches worth knowing:
Donor-Advised Funds (DAFs): Contribute before December 31, then choose which charities receive the funds on your own timeline. The tax deduction is taken in the year of the contribution, not the year of the grant.
Qualified Charitable Distributions (QCDs): For those age 70½ or older, a QCD from an IRA transfers funds directly to a qualified charity and reduces taxable income without requiring itemization. For those 73 or older, a QCD can also satisfy part or all of a required minimum distribution.
3. Review Tax-Loss and Tax-Gain Harvesting Opportunities
For those with investments in taxable accounts, reviewing realized gains and losses before year-end creates planning opportunities in both directions.
Tax-loss harvesting offsets realized gains and up to $3,000 of ordinary income. Tax-gain harvesting may make sense in a lower-income year when long-term gains can be realized at a favorable rate. The wash-sale rule applies when selling positions at a loss and repurchasing the same or substantially identical security within 30 days.
4. Confirm Withholding and Estimated Tax Payments
A year-to-date review of withholding and estimated payments helps avoid penalties and surprises at filing. This is particularly relevant for those who received a bonus, changed jobs, are self-employed, or had a significant life event affecting income. The IRS safe-harbor rules provide a useful benchmark for whether current payments are on track.
5. Review FSA and HSA Balances
Flexible Spending Account balances may need to be used by December 31 depending on whether the plan offers a grace period or limited rollover option. Confirming the specific rules of your plan before year-end avoids losing unused funds.
Health Savings Account contributions can be made until April 15 of the following year, but year-end is a good time to review current balances, confirm contribution levels, and ensure the tax advantages of the account are being fully used.
Three Year-End Tax Moves You Can Usually Ignore
1. Buying deductions you do not actually need
Spending money solely to generate a tax deduction almost always costs more than it saves. A deduction reduces taxable income, not the tax bill itself. Spending $10,000 to save $3,000 in taxes is still a net loss of $7,000. Deductions are most useful when they align with a genuine need or objective, not when the deduction is the reason for the spending.
2. Making last-minute investments based on the calendar
Investing because the year is ending is not a strategy. Investment decisions that are driven by timing rather than a long-term plan tend to create more complexity than value. Year-end is a reasonable time to review an existing portfolio for harvesting opportunities, but not a reason to make new purchases without a clear purpose within the broader plan.
3. Implementing strategies without a larger financial plan in place
Year-end moves are most effective when they fit inside a broader financial picture: cash flow, goals, risk tolerance, tax situation, and timeline. A well-executed individual tactic inside a poorly designed system has limited impact. The goal is not to optimize December in isolation. It is to make sure December's decisions support where the full financial plan is headed.
Frequently Asked Questions
What are the most important year-end tax moves for business owners? For business owners, the highest-impact year-end moves typically involve retirement contributions, compensation timing, and entity-level decisions. Confirming Solo 401(k) establishment deadlines, reviewing S corporation W-2 wages and distributions, and evaluating whether any equipment purchases qualify for bonus depreciation are all worth addressing before December 31. A CPA familiar with the business structure is the best resource for prioritizing these decisions.
What is tax-loss harvesting and when does it make sense? Tax-loss harvesting involves selling investments that have declined in value to realize a loss that can offset realized gains elsewhere in a taxable portfolio. Losses can also offset up to $3,000 of ordinary income per year, with any excess carried forward to future years. It makes the most sense when there are realized gains to offset in the same year, and when the position being sold is one that would be adjusted regardless of the tax consideration.
What is a Qualified Charitable Distribution and who can use it? A Qualified Charitable Distribution allows individuals age 70½ or older to transfer funds directly from an IRA to a qualified charity. The transfer reduces taxable income without requiring itemization, which makes it more valuable than a standard charitable deduction for many taxpayers. For those 73 or older who are subject to required minimum distributions, a QCD can satisfy part or all of the RMD obligation.
How do I know if my withholding is on track before year-end? The IRS safe-harbor rules provide a useful benchmark. Generally, you avoid underpayment penalties if your total tax payments equal at least 90% of the current year's tax liability or 100% of the prior year's liability (110% for higher-income taxpayers). Comparing year-to-date withholding and estimated payments to last year's tax bill is a simple first check. A CPA or tax professional can run a more precise year-end projection if the situation is more complex.
What is a Donor-Advised Fund and how does it work? A Donor-Advised Fund is a charitable giving account that allows a tax deduction at the time of the contribution, with the ability to distribute funds to specific charities over time. Contributing appreciated securities to a DAF before year-end can be particularly efficient: the deduction is based on the fair market value of the securities, and capital gains on the appreciation are not recognized. The DAF then sells the securities and holds the proceeds until grants are directed to chosen charities.
Related Reading
- Year-End Tax Considerations for Business Owners (2025)
- Mid-Year Tax Strategy for Business Owners (Part 1 of 2)
- Mid-Year Tax Strategy for Business Owners (Part 2 of 2)
- The Gap That Shows Up in December
- Business Owner, Meet CEO You: How to Align Personal and Business Finances at Tax Time
Educational information only. Please consult a qualified tax professional for guidance specific to your situation.
