Sure, you're enjoying your Bing Crosby and eggnog by the fire now, but in less than a month you'll be staring at your W-2 form and making a plan for filing your 2025 taxes. The IRS kicks off the tax filing season in late January, and it's never too early to think about financial moves that can get you more money back in your tax refund.

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Taking a few steps to improve your tax advantages by the end of the year can reduce your tax burden and help you get a bigger refund, but you'll need to act quickly. While it might not be feasible to buy a new heat pump before Thursday, you can contribute more to your retirement accounts (if they aren't maxed out already). And if you plan to donate to charity, now is the time to do it.

A little effort now could pay off big later. Read on to find end-of-the-year tax tips to set you up for the upcoming tax season.

1. Max out your contributions to retirement accounts

Retirement funds like 401(k) accounts and IRAs provide one of the most productive tax deductions because you can reduce your tax bill while building a nest egg for the future. If you can afford it, max out your possible contributions to any retirement account before the end of the year.

The deduction limit for 401(k) contributions for 2025 taxes is $23,500, and that does not include employer contributions. A worker in the 24% tax bracket could knock almost $5,000 off their tax bill just by saving money for the future. Crank up the percentage of your regular 401(k) contribution for the last pay period of 2025 to make the most of your potential retirement deductions.

If you're over 50, you can contribute more to your 401(k) with "catch-up" contributions totaling $7,500 per year (or $30,000 total) in 2025, if permitted by your 401(k) plan. You don't even need to be "behind" on your 401(k) contributions to make additional deferrals to your account. If you're 60, 61, 62 or 63, you can contribute even more. Under the new SECURE 2.0 Act, those folks can contribute up to $11,500 in catch-up contributions in 2025.

For IRAs, the maximum amount of tax-deductible contributions for 2025 is $7,000, or $8,000 if you're over 50. The amount of money you can deduct from your taxes depends on both your income and whether or not you have a work-provided retirement plan.

2. Sell stocks at a loss to offset capital gains

It's been another strong year for stocks in 2025 -- the S&P 500 index is up well over 15% -- but there are still plenty of stocks that lost value. One bright spot of potential stock losses is the opportunity to practice "tax loss harvesting."

This tax strategy works by realizing losses or selling your stocks and assets that have lost value, to offset other capital gains you may have earned. For example, if you made $50,000 in profit on a real-estate sale in 2025 but lost considerable money on an investment in a struggling stock (like Carmax), you can sell your securities and subtract the financial loss of that investment from your capital gains. If you have $50,000 in stock losses, you'll offset the $50,000 you earned from the real-estate sale to eliminate that tax burden.

Capital gains include any income that you earn through the sale of assets, such as stocks, real estate, cars, furnishings or any other tangible properties, but you must actually sell assets to realize losses and offset gains.

3. Make your home more energy efficient

Even though the One Big Beautiful Bill Act of 2025 eliminated most benefits in the Inflation Reduction Act of 2022, the incentives to make your home "greener" still exist for the 2025 tax year. For this tax year, the residential clean energy credit -- which gives money back for installing solar panels, geothermal heat pumps, fuel cells and battery storage -- is still at 30%.

Tax credits have more of an impact on your tax bill than deductions. Deductions lower your level of taxable income, tax credits directly reduce the amount of taxes that you owe to the IRS.

Installing a solar energy system, wind turbine or geothermal heat pump can now give you 30% of the cost back if completed before Jan. 1, 2026. In California, the average cost of solar installation is $11,970. If you made that average improvement to your home in 2025, you'd knock $3,591 off your taxes.

Tax credits for energy improvements aren't limited to alternative energy. Simply installing new, qualified Energy Star-certified heat pumps, furnaces and boilers can still reap tax credits in 2025, although smaller than for alternative energy. Be sure to check the manufacturer's tax certification statement, as not every Energy Star-certified product is eligible.

4. Could you defer an end-of-year bonus or payment?

It's not always easy to postpone payment from your employer, but if you receive an end-of-year bonus and are looking to decrease your taxable income as much as possible this year, consider asking your company to pay you in January.

Similarly, if you're a freelancer or contractor and you want to reduce your taxable income for 2025, consider delaying your invoices until December so that you don't get paid until January. You're only postponing the payment of income taxes on that money until your 2025 taxes are due, so you'll need to strategize on whether this year or next would be better for earning that money.

5. Donate to charities now if you want more tax deductions

If you itemize your tax deductions and like to contribute financially to the causes and groups that you support, do it before the end of the year to best reduce your taxable income for 2025. Most taxpayers can generally deduct charitable donations up to 50% of their taxable income. 

Before donating, make sure that your contribution will be indeed tax deductible by searching the IRS database of tax-exempt organizations. All valid charities and nonprofits will also have a tax identification number that identifies them as tax-exempt.

6. Check required minimum distributions from IRAs and 401(k)s

US tax law requires that Americans start receiving distributions from their personal or work-provided retirement accounts when they reach a certain age. Starting in 2023, the SECURE 2.0 Act raised the age from 72 to 73, for those who turned 72 after Dec. 31, 2022. These distributions are mandatory for 401(k) plans, traditional IRAs, profit-sharing plans and pensions. They're not required for Roth IRAs while the owner is alive.

Required minimum distributions, or RMDs, are calculated by adding up all of the money in your retirement accounts and dividing by an IRS life expectancy factor. The Securities and Exchange Commission provides a simple calculator that incorporates the latest IRS life expectancy tables.

The administrator of your retirement plan is required to follow tax law for RMDs, but it's up to you to make sure you get the correct amount. If you don't meet the required amount for your RMD, you'll face one of the harshest IRS penalties. The excise tax on RMD failures has been 50% in the past, but the SECURE 2.0 Act reduces the penalty to 25%, and further to 10% if the RMD is corrected within two years.

Still, if you were required to withdraw $20,000 in 2025 but only received $10,000, you could be on the hook for a $2,500 penalty. It's definitely worth double-checking your RMD for 2024 and withdrawing more money if required.

7. Combine your medical expenses into one year

Medical expenses can be a significant deduction for many taxpayers, but the IRS only allows you to deduct expenses that are in excess of 7.5% of your AGI. For example, if your AGI is $50,000, and you spent $5,000 on medical expenses, you can deduct $1,250 ($5,000 – ($50,000 x 7.5%)) from your taxable income.

For that reason, it can be advantageous to group all of your major medical expenses into one year. These expenses can include surgeries, preventative care, hospital visits, dental care, prescription medicine, glasses, hearing aids and mental health care like therapy, as well as transportation costs to and from providers.

If you're approaching 7.5% of AGI in medical expenses this year, then consider making as many of your anticipated health-related purchases by the end of December. Get your teeth straightened, buy those new glasses or schedule that elective surgery by the end of 2025, and you'll maximize your medical deductions.

Similarly, if you're not approaching that 7.5% of the AGI threshold for medical expenses in 2025, hold off on any non-urgent health-related purchases until January when they could be more advantageous for next year's income taxes.

8. Strategize your business expenses

If you're self-employed or a freelancer, deducting your business expenses can save you considerable money on taxes. Depending on how much you've spent on your professional work this year, you might consider prepaying for next year's expenses before the end of 2025 to reduce your tax burden.

For instance, instead of buying supplies a month at a time, you could order and pay in December 2025 for supplies that you'll use for several months of 2026. The timing of your deductions might depend on whether you use a cash method of accounting or accrual basis, but front-loading business expenses for next year is a time-tested way of reducing your taxable income for the current year.

It's very important to note that everyone's tax situation is different. These end-of-year tax tips may be effective for you, but there is no "one size fits all" approach to tax preparation. Be sure to consult a tax professional before making any major tax decisions.