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Short Term Capital Gains tax vs. IRA Withdrawal Tax w/o Quarterly Est. Taxes
Bottom line is this: there's no "short term capital gains tax" in the US. There's only long term capital gains tax, which is lower than the regular (aka ordinary) tax rates. Short term capital gains are taxed using the ordinary tax rates, depending on your bracket. So if you're in the 25% bracket - your short term gains are taxed at 25%. You're describing two options: For the case #1 you'll pay 25% tax (your marginal rate) + 10% penalty (flat rate), total 35%. For the case #2 you'll pay 25% tax (your marginal rate) + 0% penalty. Total 25%. Thus, by withdrawing from IRA you'll be 10% worse than by realizing capital gains. In addition, if you need $10K - taking it from IRA will make the whole amount taxable. While realizing capital gains from a taxable account will make only the gains taxable, the original investment amount is yours and had been taxed before. So not only there's a 10% difference in the tax rate, there's also a significant difference in the amount being taxed. Thus, withdrawing from IRA is generally not a good idea, and you will never be better off with withdrawing from IRA than with cashing out taxable investments (from tax perspective). That's by design.