Year-End Tax Planning Strategies

Actions you take before December 31 can significantly reduce your tax bill. Use these strategies to keep more of what you earn.

Who This Guide Is For

This guide is for any taxpayer looking to lower their federal tax liability before the calendar year ends. It is especially valuable for higher-income earners, investors with taxable brokerage accounts, self-employed individuals, and anyone who has not yet maximized their retirement or HSA contributions. Even if you have a straightforward W-2 job, the strategies below can help you keep more of your income.

Key Takeaways

Maximize 401(k) contributions (up to $24,000 in 2026, plus $7,500 catch-up if age 50+) before December 31 to reduce taxable income.
Harvest investment losses to offset capital gains and deduct up to $3,000 against ordinary income, but watch the 30-day wash sale rule.
Max out HSA contributions ($4,400 self / $8,750 family in 2026) for a triple tax advantage on medical savings.
Consider a Roth IRA conversion in low-income years to lock in tax-free growth for the future.
Accelerate charitable donations and deductible expenses into the current year if you plan to itemize.

Maximize Retirement Contributions

Retirement contributions are one of the most effective ways to lower taxable income.

401(k) / 403(b): Contributions must be made by Dec 31 (via payroll deduction). Maximize this ($24,000 limit in 2026) if possible.
IRA: Traditional IRA contributions allow tax deductions. You have until the April filing deadline, but planning now helps.
Solo 401(k): Must check plan establishment deadlines (often Dec 31) even if funding is later.

Tax-Loss Harvesting

If you have investments that have lost value, selling them realizes a "capital loss."

Offset Gains: Losses first offset any capital gains you realized this year.
Offset Income: If losses exceed gains, you can deduct up to $3,000 against ordinary income (wages).
Wash Sale Rule: Be careful not to buy the "substantially identical" security within 30 days before or after the sale, or the loss is disallowed.

Accelerate Deductions

If you itemize deductions, paying expenses before year-end pulls the tax benefit into the current year.

Charitable Donations: Donate cash or goods by Dec 31. Charges to credit cards count in the year charged.
Medical Expenses: If you're near the 7.5% AGI threshold, prepay upcoming medical/dental bills.
Property Taxes: Pay property tax bills due early next year before Dec 31 (check SALT cap first).
Mortgage Interest: Make January's mortgage payment in late December.

Defer Income

If you expect to be in the same or lower tax bracket next year, deferring income delays the tax bill.

Bonuses: Ask if year-end bonuses can be paid in January.
Self-Employed Invoicing: Send invoices later in December so payment arrives in January (if using cash basis accounting).

HSA and FSA

HSA: Max out HSA contributions ($4,400 self / $8,750 family in 2026). Triple tax advantage!
FSA: Spend down Flexible Spending Account funds if your plan doesn't allow rollover. "Use it or lose it."

Review Investments

RMDs: If you are age 73+, ensure you've taken your Required Minimum Distribution to avoid a 25% penalty.
Roth Conversion: If you have a low-income year, consider converting Traditional IRA funds to Roth (pay tax now at low rate, tax-free growth forever).
Mutual Fund Distributions: Avoid buying effectively taxable distributions by purchasing mutual funds after their annual distribution date in December.

Frequently Asked Questions

Tax-loss harvesting is the practice of selling investments that have declined in value to realize a capital loss. Those losses first offset any capital gains you earned during the year. If your losses exceed your gains, you can deduct up to $3,000 of the remaining loss against ordinary income. Be mindful of the wash sale rule, which disallows the loss if you buy the same or a substantially identical security within 30 days before or after the sale.

The employee elective deferral limit for 401(k) plans in 2026 is $24,000. If you are age 50 or older, you can contribute an additional catch-up amount of $7,500, bringing the total to $31,500. These contributions must be made through payroll deduction by December 31.

A Roth conversion can be beneficial if you are in a lower tax bracket than usual, such as during a gap year between jobs or a year with unusually low income. You pay income tax on the converted amount now, but all future growth and qualified withdrawals are tax-free. Consider converting only enough to stay within your current tax bracket to avoid pushing yourself into a higher one.

For 2026, the HSA contribution limit is $4,400 for self-only coverage and $8,750 for family coverage. If you are age 55 or older, you can contribute an additional $1,000 catch-up contribution. HSA contributions are tax-deductible, grow tax-free, and withdrawals for qualified medical expenses are also tax-free.

Yes, but only if you itemize deductions on Schedule A. Cash and property donations to qualified charities made by December 31 are deductible in the current tax year. Credit card charges count in the year they are charged, even if you pay the bill in January. If you do not itemize, charitable donations generally do not reduce your federal tax.

Sources & References

Disclaimer: This guide is for informational purposes only and does not constitute tax advice. Consult a qualified tax professional for advice specific to your situation.