Year-End Tax Planning Moves to Make Before December 31
As the year end draws near, it is crucial to navigate the tax planning window whether you’re an individual or business. Here are moves that work, and ones action-required before December 31st.
Written by: Chris Sternau
Date of publication: 10.23.2026
Table of Contents
While most taxpayers believe they can collect their documents throughout the year and find ways to lower their tax bill come the April deadline, the reality is that they cannot. Most taxpayers spend a significant amount of time managing their tax return not realizing the opportunities and decisions that affect their tax liability have already been made or missed. The prime window of opportunity to act is within the calendar year, and the most beneficial time is in the final few months.
Effective year-end tax planning isn’t about making rash decisions. What it comes down to is well-thought-out and precise moves before deadlines close. Taking action before December 31st can help you avoid missing strategies that could have produced a meaningful impact on your financials.
This guide will highlight the most consequential year-end tax strategies available to all taxpayers – individuals, business owners, investors – with practical counselling on timing, eligibility and deadlines.
Key Takeaways:
- Most tax-planning decisions close on December 31 — not April 15. The filing deadline gives you time to report what happened, not to change it. The strategies that lower your bill have to be executed before the year ends.
- 401(k) contributions must be made through payroll before year-end. For 2026, the employee contribution limit is $24,500 — with enhanced catch-up provisions for those 50 and older. Unlike IRAs, these cannot be made after December 31 and applied to the prior year.
- IRA contributions are one of the few exceptions with a post-year deadline. Roth and Traditional IRA contributions for 2026 can generally be made up to April 15, 2027 — giving taxpayers more flexibility, though income limits and phase-outs still apply.
- Tax loss harvesting only works if completed before December 31. Selling investments at a loss can offset realized gains and reduce your tax bill — but the wash-sale rule applies, and the timing of each trade matters.
- Long-term capital gains may be taxed at 0% for taxpayers within certain income thresholds. For 2026, single filers with taxable income up to $49,450 and married filers up to $98,900 may qualify — making careful year-end income planning worth running the numbers on.
- Charitable giving strategies like QCDs, donor-advised funds, and appreciated securities donations carry their own deadlines and documentation requirements. Each has distinct tax treatment, and the difference between doing them right and doing them wrong can cost the deduction entirely.
- Business equipment must be placed in service — not just purchased — before December 31 to qualify for Section 179 or bonus depreciation in the current year. With the 2026 Section 179 limit at $2.56 million, year-end equipment decisions deserve a conversation with your CPA before the purchase is made.
Retirement Account Contributions
401(k) and Employer Plan Contributions
Employee 401(k) contributions are made through payroll and close by December 31st. If you plan to maximize these contributions for the year, it is crucial not to wait until the last minute. Generally, you need to have the proper amount withdrawn from each paycheck in order to meet the contribution limit. Unlike IRAs, these contributions cannot be made after the end of the year and designated to the previous year.
For 2026, the contribution limit for employees is $24,500. Anyone participating that is 50 years and older, can potentially contribute an additional $8,000, while those turning 60-63 years of age in 2026 may qualify for an enhanced catch-up with the limit of $11,250.
Before year-end it is important to have a conversation with your employer, or plan administration, to confirm your contribution limits and payroll deadlines. You may have more room than you think to increase your deferrals and maximize your contributions.
IRA Contributions — You Have Until April 15
Unlike 401(k) contributions, IRA contributions can be made through tax-filing deadline for the following year, even without an extension. Specifically the tax year 2026, most taxpayers have until April 15, 2027 to make a Roth IRA or Traditional contribution for the filing year- 2026. Additionally, the combined contribution limit for these is $7,500. For individuals of 50 years or older, it is $8,600 and subject to taxable compensation limits.
Roth IRA eligibility is subject to income limits. In 2026, the contribution phaseout for single filers and heads of household is $153,000–$168,000 of modified AGI, while for married couples filing jointly it is $242,000–$252,000.
If a taxpayer is of higher-income, who cannot contribute to a Roth IRA, they may consider a backdoor Roth. This would mean the making of nondeductible contributions to a Traditional IRA and then converting those funds into a Roth IRA.
This strategy would need to be evaluated with proper advising as there could be potential tax implications if you already have pre-tax IRA balances.
SEP-IRA and Solo 401(k) for Self-Employed
For individuals who are self-employed, retirement contribution deadlines can vary by plan. SEP-IRA contributions generally can be made by the tax-return filing date of the business, including extensions. However, a Solo 401(k) works differently- by December 31st of the plan year, elected deferrals must be chosen. Depending on the retirement plan and business structure, the actual contribution can often be made later.
SEP-IRA contributions can generally be as high as 25% of eligible compensation, subject to the applicable annual limit for 2026. Because deadlines and rules differ, business owners should review their plan before year-end to determine what action may be required.
Investment Portfolio — Tax Loss Harvesting and Gain Management
Tax Loss Harvesting
Tax loss harvesting involves selling an investment at a loss to offset a capital gain from other investments. This can reduce your tax bill when you have gains if it is done before year-end.
Start by computing your net capital gain or loss by adding up your realized gains and losses. If the losses exceed the amount of gain, you can generally deduct up to $3,000 against your ordinary income with additional losses carried forward to future years.
It is important to keep in mind the wash-sale rule. If you do sell an investment at a loss and buy the same or identical investment within 30 days before or after the sale, the loss generally cannot be claimed immediately.
These rules can be complex, review each trade carefully before making any year-end sales.
Managing Capital Gain Brackets
An opportunity often overlooked involves managing capital gain brackets. Long-term capital gains can receive favorable federal tax treat based on your taxable income and filing status- with rates of 0%, 15%, or 20%. For the 2026 tax year, the 0% rate applies to single filers with a taxable income up to $49,450 and married filing jointly couples with taxable income up to $98,900. By carefully timing the sale of appreciated investments, some gains may be realized at a 0% federal capital gains rate.
Keep in mind that the calculation is based on total taxable income, and other taxes may apply depending on your circumstances. Before selling, consider your expected income, other capital gains and losses, and whether the investment still fits your long-term plan.
Qualified Opportunity Zone Investments
Investors who realize eligible capital gains may be able to defer the tax by investing the gain in a Qualified Opportunity Fund (QOF) within 180 days of the gain being recognized. The 180-day period generally extends beyond year-end for gains realized late in the year, so the investment doesn’t necessarily have to be completed by December 31.
However, QOF investments require precise planning. The rules generally require an equity investment in the fund, and the tax benefits depend on how long the investment is held. For 2026 gains, recent tax-law changes also affect how the deferral and holding periods work, making it especially important to review the current rules before investing.
Charitable Giving Strategies
Qualified Charitable Distributions for IRA Owners
A Qualified Charitable Distribution (QCD) lets you transfer money directly from an eligible IRA to a qualified charity if you are 70 ½ years or older. For the tax year 2026, the annual limit for the QCD is $111,000. This distribution can count toward your required minimum distribution (RMD) while generally staying out of taxable income.
In order to qualify for a QCD, the money must go directly from the IRA trustee to the charity. If the distribution is received by the taxpayer first and then donated after, it usually will not qualify as a QCD.
Donor-Advised Funds
A donor-advised fund (DAF) is a strategy used for taxpayers who have a higher-income year that want to make large charitable contributions while spreading them out over time. Cash or appreciated assets are contributed to the fund, generally allowing the claim of charitable deduction in the year of the contribution if eligible, and then recommend grants in future years to qualified charities. The individual retains the advisory privileges over the grants and investments while the organization has legal control of the assets.
Instead of making many small charitable donations each year, you contribute several years at once- commonly known as a “bunching” strategy. Depending on your overall tax situation, a large contribution may make itemizing deductions more impactful.
Appreciated Securities Donations
There are two potential tax benefits when donating appreciated securities directly to a qualified charity.
If an investment has been held for more than one year, you can:
- Generally, deduct its fair market value at the time of the donation- while still subject to applicable charitable deduction limits
- Avoid capital gains tax on the appreciation
For example, if you bought stock for $10,000 and it’s now worth $25,000, donating the shares directly may allow a $25,000 charitable deduction without recognizing the $15,000 capital gain. By contrast, selling the stock first could trigger tax on the gain before proceeds are donated.
Keep in mind that the rules vary for securities held one year or less, and larger noncash contributions may require additional documentation, such as Form 8283.
Business Owner Moves
Accelerate or Defer Income and Expenses
For cash-basis business owners, the timing of when money comes in and goes out can affect which tax year reports the income or deduction. Generally, income is taxable when it is actually or constructively received, while business expenses are generally deductible when they are paid.
That can create year-end planning opportunities for accelerating or deferring income and expenses. For example, receiving a client payment before December 31st usually brings the income into the current tax year, while a legitimate delay in receiving payment may push it into the following year. Similarly, paying qualifying business expenses before year-end can generally secure the deduction in the current year.
Section 179 and Bonus Depreciation on Equipment Purchases
While it can be advantageous to purchase business equipment before year-end for a deduction, the property must also be placed in service- not just bought or received. To be placed in service, the equipment needs to be ready and available for business use before December 31st to qualify for that tax year.
Certain equipment may be eligible for Section 179, which would allow the business to deduct qualifying costs immediately; however, there are annual limits to consider. The Section 179 deduction limit for 2026 is $2.56 million, with a phaseout beginning once the total qualifying property placed in service exceeds $4.09 million.
A bonus depreciation may be allowed for qualifying property placed in service after January 19, 2025- making the timing of purchases at the end of the year critical to consider.
Reviewing Estimated Tax Payments
There are four estimated tax payments due throughout the year:
- Q1: April 15th
- Q2: June 15th
- Q3: September 15th
- Q4: January 15th (of the following year)
The Q4 estimated tax payment for 2026 is due January 15, 2027. Business owners and other taxpayers with income that changed significantly during the year should review their projected tax liability and estimated payments before the deadline.
A common way to avoid an underpayment penalty is to have paid at least 90% of your current-year tax or 100% of your prior-year tax through withholding and estimated payments. For higher-income taxpayers, the prior-year safe harbor generally increases to 110%.
Even if you pay the remaining balance when you file your return, you can still owe an underpayment penalty for insufficient or late estimated payments.
Tax Planning End of Year Checklist:
- Confirm 401(k) contributions are on track to hit the annual maximum
- Review investment portfolio for loss harvesting opportunities
- Calculate capital gain exposure and model tax bracket positioning
- Evaluate charitable giving strategy — QCD, DAF, or appreciated securities
- Accelerate or defer business income and expenses based on current-year rate expectations
- Confirm equipment purchases are placed in service before December 31
- Review Q4 estimated tax payment against safe harbor thresholds
- Schedule a year-end meeting with your CPA before the week of December 31
Year-End Tax Planning Moves Require More Than Just Time To Execute
The Bottom Line
Many tax-planning strategies depend on action before December 31, and some require weeks or months of preparation. A year-end review with your CPA can help identify opportunities while there is still time to act—rather than discovering them after the tax year has closed.
FAQ
- Q1: What is the deadline for 401(k) contributions?
A: Employers may have different procedures in place; however, primarily most employees’ salary-deferral contributions must be received by December 31st.
- Q2: What is tax loss harvesting and how does it work?
A: Tax loss harvesting is when an investment is sold at a loss to offset capital gains. If losses exceed gains, taxpayers can generally deduct up to $3,000 against their ordinary income and carry forward excess losses.
- Q3: What is a Qualified Charitable Distribution?
A: A qualified charitable distribution is a payment from an IRA to a charity by someone 70 ½ years or older. It may be excluded from taxable income and is subject to annual limits.
- Q4: Can I deduct equipment I purchased in December?
A: Equipment must be purchased and placed in service during the tax year.
- Q5: When is the Q4 estimated tax payment due?
A: For the tax year 2026, the deadline for Q4 estimated tax is due January 15, 2027.
- Q6: What is a donor-advised fund?
A: A donor-advised fund is a charitable giving account maintained by a sponsoring 501(c)(3). You contribute assets to the fund, receive the applicable charitable deduction, and recommend grants to charities.
- Q7: How do I know if I should accelerate or defer income at year-end?
A: By comparing your expected 2026 vs 2027 tax rates and income, it can make sense to accelerate of defer. Accelerating is beneficial if you expect a higher rate next year; deferring may help if the rate is lower.
External Links / Support:
IRS Tax Planning Pointers: https://www.irs.gov/newsroom/year-round-tax-planning-pointers-for-taxpayers
IRS 1040-ES 2026: https://www.irs.gov/pub/irs-pdf/f1040es.pdf?utm_source=chatgpt.com
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