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After December 31, most of these are gone for 2026. 1. 401(k). The 2026 limit is $24,500, or $32,500 if you're 50 or older. It has to come out of your paychecks, so ask HR to raise your percent now. 2. Tax-loss harvesting. Sell investments that are down to cancel out gains. Losses beyond your gains can cut up to $3,000 of regular income. Don't buy the same investment back within 30 days, or the loss doesn't count. 3. Roth conversion. You pay tax on what you move now, and it grows tax-free after. It makes the most sense in a year when your income is lower than normal. 4. 529 plan. Many states give you a tax deduction for putting money in. Most need it in by December 31. Check your state's rules. 5. Donor-advised fund. Put two years of giving in at once. That can push you over the standard deduction ($32,200 for married couples in 2026), so the gift lowers your taxes. It's not too late for everything. You can still put money in an IRA or HSA for 2026 until April 15, 2027. But the biggest tax savings come from planning the whole year ahead, not cramming in December. Start planning 2027 now. If you found this valuable, check out my other content.