As December winds down, now’s the time to make strategic tax moves that could save you money. Use this comprehensive checklist to ensure you’re maximizing deductions and minimizing your tax bill before December 31.
Retirement Contributions
401(k) and 403(b) Plans
- Contribution limit: $23,000 ($30,500 if age 50+)
- Must be funded by December 31, 2025
- Reduces your taxable income dollar-for-dollar
- Check with your employer about making additional contributions before year-end
Traditional and Roth IRAs
- Contribution limit: $7,000 ($8,000 if age 50+)
- Deadline: April 15, 2026 (but contribute now to maximize tax-free growth)
- Traditional IRA contributions may be tax-deductible
- Roth contributions don’t reduce current taxes but grow tax-free
Self-Employed Retirement Plans
- SEP-IRA: Up to 25% of compensation or $69,000
- Solo 401(k): Up to $69,000 ($76,500 if age 50+)
- Significantly higher limits than traditional IRAs
- Must be established by December 31 for SEP-IRAs
Investment Strategies
Tax-Loss Harvesting
- Review your portfolio for underperforming investments
- Sell losing positions to offset capital gains
- Can deduct up to $3,000 in net losses against ordinary income
- Excess losses carry forward to future years
- Watch out for the wash-sale rule (can’t repurchase same security within 30 days)
- Consider replacing sold securities with similar (but not identical) investments
Capital Gains Management
- Review unrealized gains and losses across all accounts
- Consider taking gains in low-income years
- Long-term gains (held 1+ year) taxed at lower rates than short-term
- Coordinate sales to optimize your tax bracket
Rebalance Your Portfolio
- Use year-end as an opportunity to rebalance
- Do this in tax-advantaged accounts when possible to avoid triggering gains
- Harvest losses strategically while rebalancing
Charitable Giving
Direct Cash Donations
- Must be completed by December 31 to count for 2025
- Keep receipts for all donations ($250+ requires written acknowledgment)
- Can deduct up to 60% of AGI for cash donations to public charities
- Only beneficial if you itemize deductions
Donor-Advised Funds (DAFs)
- Contribute multiple years’ worth of donations in 2025
- Get immediate tax deduction, distribute to charities over time
- Helps you exceed the standard deduction threshold
- Can donate appreciated securities to avoid capital gains taxes
Donating Appreciated Securities
- Avoid paying capital gains tax on appreciated stocks
- Charity receives full fair market value
- You deduct the full current value (if held 1+ year)
- Win-win for you and the charity
Qualified Charitable Distributions (QCDs)
- Available if you’re age 70½ or older
- Transfer up to $105,000 directly from IRA to charity in 2025
- Counts toward your required minimum distribution
- Reduces taxable income (better than a deduction)
- Not reported as income, avoiding AGI-related thresholds
Non-Cash Donations
- Clothing, household items, vehicles all deductible
- Must be in good condition
- Get written receipt from charity
- Items over $5,000 may require appraisal
Health Savings Accounts (HSAs)
Contribution Limits
- Individual coverage: $4,300
- Family coverage: $8,550
- Age 55+ catch-up: Additional $1,000
- Deadline: April 15, 2026 (but contribute now if possible)
Triple Tax Advantage
- Contributions are tax-deductible
- Growth is tax-free
- Withdrawals for qualified medical expenses are tax-free
Strategic HSA Use
- Don’t feel pressured to spend it—HSAs roll over indefinitely
- Can function as supplemental retirement account after age 65
- Save receipts for medical expenses to reimburse yourself years later
- Invest HSA funds for long-term growth
Required Minimum Distributions (RMDs)
Who Must Take RMDs
- Age 73+ (or 75+ if you turned 74 after December 31, 2032)
- Applies to traditional IRAs, 401(k)s, 403(b)s, and most retirement accounts
- Roth IRAs don’t require RMDs during owner’s lifetime
- Still-working exception may apply for current employer’s 401(k)
Critical Deadlines
- December 31, 2025 for most people
- April 1, 2026 if this is your first RMD (means two distributions in 2026)
- Missing RMD triggers 25% penalty on amount not withdrawn
- Penalty can be reduced to 10% if corrected quickly
RMD Strategies
- Calculate carefully or ask your custodian
- Consider QCDs to satisfy RMD without tax impact
- Aggregate IRA RMDs can be taken from one account
- Each 401(k) requires separate RMD
Flexible Spending Accounts (FSAs)
Use-It-or-Lose-It Rules
- Most FSAs forfeit unused funds after December 31
- Some employers offer grace period through March 15, 2026
- Others allow carryover of up to $640 into 2026
- Check your specific plan rules
Eligible Expenses
- Prescription medications
- Over-the-counter drugs and medicines
- Eyeglasses and contact lenses
- Dental treatments
- Copays and deductibles
- First aid supplies
- Sunscreen (SPF 15+)
Last-Minute Spending Ideas
- Stock up on prescription refills
- Schedule dental cleanings or vision exams
- Purchase new glasses or contacts
- Buy eligible items online (many retailers offer FSA filters)
Estimated Tax Payments
Who Needs to Pay
- Self-employed individuals
- Independent contractors
- Those with significant investment income
- Anyone who doesn’t have enough tax withheld
Q4 Payment Deadline
- Officially due January 15, 2026
- Pay by December 31, 2025 to deduct state/local taxes in 2025
- Subject to $10,000 SALT cap regardless
Avoid Underpayment Penalties
- Pay 90% of current year’s tax or 100% of prior year’s tax (110% if AGI over $150,000)
- Use safe harbor rules to avoid penalties
- Adjust withholding for 2026 if needed
Income and Deduction Timing
Defer Income to 2026
- Delay year-end bonuses if expecting lower 2026 tax rates
- Hold off on invoicing clients until January
- Defer capital gains by waiting to sell investments
- Consider installment sales for large transactions
Accelerate Income to 2025
- Take bonuses early if expecting higher 2026 rates
- Accelerate Roth conversions in low-income years
- Realize capital gains if you’re in 0% bracket
- Exercise stock options strategically
Accelerate Deductions into 2025
- Prepay January mortgage payment
- Pay property taxes early (subject to $10,000 SALT cap)
- Make estimated state tax payment
- Pay medical bills before year-end
- Purchase business equipment
Defer Deductions to 2026
- If you’re close to standard deduction, bunch deductions
- Delay charitable giving to exceed threshold next year
- Consider alternating years for itemizing
Tax Withholding Review
Signs You Need to Adjust
- Large refund last year (you gave IRS an interest-free loan)
- Owed significant amount at tax time
- Major life changes (marriage, divorce, new job, new baby)
- Started side business or freelancing
How to Adjust
- Submit new W-4 to employer for 2026
- Use IRS Tax Withholding Estimator tool
- Consider additional withholding if self-employed
- Adjust throughout year as income changes
Business Owner Strategies
Section 179 Deduction
- Deduct up to $1,220,000 in equipment purchases
- Must be placed in service by December 31
- Applies to vehicles, computers, furniture, machinery
- Phases out after $3.05 million in total purchases
Bonus Depreciation
- Immediate write-off for qualified property
- Applies to new and used equipment
- Percentage varies by year
- Coordinate with Section 179 for maximum benefit
Home Office Deduction
- Regular and exclusive business use required
- Simplified method: $5 per square foot (up to 300 sq ft)
- Actual expense method: Calculate percentage of home expenses
- Self-employed only (W-2 employees generally can’t claim)
Hire Family Members
- Pay reasonable wages to children for legitimate work
- Children’s income taxed at their (lower) rate
- Kids under 18 avoid Social Security/Medicare taxes in parent’s business
- Teach valuable skills while reducing tax bill
Year-End Business Expenses
- Stock up on supplies and inventory
- Prepay expenses (rent, insurance, subscriptions)
- Make necessary repairs and maintenance
- Invest in marketing and advertising
Real Estate Considerations
Mortgage Interest
- Deductible on loans up to $750,000 ($375,000 if married filing separately)
- Only beneficial if itemizing
- Includes points paid on new mortgages
- Home equity loan interest may be deductible if used for home improvements
Property Taxes
- Deductible up to $10,000 combined state/local taxes
- Can prepay 2026 taxes in 2025 (if assessed)
- Consider timing of payment strategically
- Applies to primary and secondary homes
Energy-Efficient Home Improvements
- Up to $3,200 annual credit for qualifying improvements
- Heat pumps, windows, doors, insulation
- 30% credit for solar panels, geothermal
- Must be placed in service by December 31
Rental Property Owners
- Maximize depreciation deductions
- Deduct repairs and maintenance
- Consider cost segregation study
- Track all expenses meticulously
Education Tax Benefits
529 Plans
- Contributions may be state tax-deductible (varies by state)
- Growth is tax-free when used for education
- Up to $10,000 annually for K-12 tuition
- Can change beneficiary to another family member
- Recent changes allow rollovers to Roth IRAs under certain conditions
American Opportunity Credit
- Up to $2,500 per student for first four years of college
- 40% refundable even if no tax liability
- Covers tuition, fees, books, required supplies
- Income limits apply
Lifetime Learning Credit
- Up to $2,000 per tax return
- Available for undergraduate, graduate, and professional courses
- No limit on number of years
- Lower income limits than American Opportunity Credit
Student Loan Interest
- Deduct up to $2,500 in interest paid
- Available even if you don’t itemize
- Income limits apply
- Applies to qualified education loans only
Roth Conversion Strategies
Why Consider Roth Conversion
- Pay taxes now at current rates
- Future growth and withdrawals are tax-free
- No RMDs during your lifetime
- Beneficial if expecting higher future tax rates
Best Times to Convert
- Low-income years (retirement, sabbatical, business loss)
- Before Social Security and RMDs begin
- When market values are down
- If you can pay taxes from non-retirement funds
Conversion Considerations
- Increases taxable income in conversion year
- May affect Medicare premiums (IRMAA)
- Could impact financial aid eligibility
- Consider partial conversions over multiple years
- Must stay in Roth 5 years to avoid penalties
Family and Gift Tax Planning
Annual Gift Tax Exclusion
- Gift up to $19,000 per person in 2025
- No gift tax return required
- Can give to unlimited number of people
- Married couples can give $38,000 per recipient jointly
529 Plan Superfunding
- Contribute five years’ worth in one year ($95,000 individual, $190,000 couple)
- Special election treats as spread over five years
- Removes assets from taxable estate
- Must file gift tax return even though no tax owed
Medical and Education Exclusions
- Pay directly to medical providers or educational institutions
- No dollar limit
- Doesn’t count against annual exclusion
- Great strategy for grandparents helping family
Life Changes and Documentation
Major Life Events
- Marriage or divorce (affects filing status)
- New baby (dependent, child tax credit)
- Home purchase (mortgage interest, property taxes)
- Job change (retirement plan options, withholding)
- Starting a business (estimated taxes, deductions)
Update Beneficiaries
- Review retirement account beneficiaries
- Check life insurance policies
- Update estate planning documents
- Ensure accounts transfer as intended
Organize Your Records
- Gather all receipts and documentation
- Organize by category (medical, charitable, business)
- Digital copies recommended for backup
- Keep tax records for at least three years (seven for major items)
Documents to Collect
- W-2s, 1099s, K-1s
- Brokerage statements showing gains/losses
- Receipts for deductible expenses
- Mileage logs for business/medical/charitable driving
- Home office measurements and expenses
- Charitable contribution acknowledgments
Don’t Forget These Often-Overlooked Deductions
Medical Expenses
- Deductible if exceeding 7.5% of AGI
- Includes insurance premiums, copays, prescriptions
- Mileage to medical appointments (21 cents per mile in 2025)
- Medical conferences for chronic conditions
- Service animals and specialized equipment
State and Local Taxes (SALT)
- $10,000 cap on combined property and state taxes
- Choose between income taxes or sales taxes
- Prepaying 2026 property taxes may help
- Check if your state offers workarounds
Job Search and Education Costs
- Certain work-related education may be deductible
- Professional development and certifications
- Union dues and professional memberships
- Required uniforms and tools
Miscellaneous Deductions
- Educator expenses ($300 above-the-line deduction)
- Jury duty pay given to employer
- Gambling losses (up to amount of winnings)
- Casualty and theft losses from federally declared disasters
When to Consult a Professional
Complex Situations
- Self-employment or business ownership
- Rental properties or real estate investments
- Large capital gains or losses
- Inherited assets or estate issues
- Multi-state income
- Foreign income or accounts
- Stock options or equity compensation
Major Life Changes
- Marriage, divorce, or death of spouse
- Birth or adoption
- Starting or selling a business
- Retirement
- Large inheritance or windfall
Red Flags for Professional Help
- Previous IRS audits or issues
- Owing large amounts in back taxes
- Complex investment portfolios
- Cryptocurrency transactions
- International tax implications
Final Reminders
Act Before December 31
- Most tax-saving strategies require action by year-end
- Don’t wait until the last week—some transactions take time
- Electronic donations may process faster than checks
- Confirm receipt of charitable contributions
What Can Wait Until April 15
- IRA contributions
- HSA contributions
- Filing your actual tax return
- Claiming refundable credits
Stay Organized
- Create a dedicated tax folder (physical or digital)
- Label everything clearly
- Save confirmation emails for donations and transactions
- Take photos of receipts that might fade
Look Ahead to 2026
- Adjust withholding based on 2025 results
- Plan estimated tax payments if applicable
- Set calendar reminders for quarterly deadlines
- Consider tax implications of major planned purchases or changes
Taking control of your taxes before year-end can lead to significant savings and reduce stress when April rolls around. Start with the strategies most relevant to your situation. Every dollar you save on taxes is a dollar you can put toward your financial goals.
Disclaimer: This checklist provides general information and should not be considered personalized tax advice. Tax laws are complex and change frequently. Consult with a qualified tax professional or CPA for advice specific to your situation.
