If your investments have fluctuated wildly this year, you may have already recognized some significant gains and losses. But nothing is decided tax-wise until year-end when the final results of your trades will reveal your 2023 tax situation. Here’s what you need to know to avoid tax surprises. Tax-favored retirement accounts and taxable accounts  If you’ve had wild swings in the value of investments held in a tax-favored 401(k), traditional IRA, Roth IRA or self-employed SEP account, there’s no current tax impact. While these changes affect your account value, they have no tax consequences until you finally start taking withdrawals. At that point, the size of your balance(s) will affect your tax bills. If you have investments in a Roth IRA, qualified withdrawals taken after age 59½...