But that's just to adjust the estimated tax payments to a number I choose. I'm looking or help in deciding on that number to avoid penalties and interest. I understand that if you under-withhold in...
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But that's just to adjust the estimated tax payments to a number I choose. I'm looking or help in deciding on that number to avoid penalties and interest. I understand that if you under-withhold in the first quarter, even if you owe nothing by the time you make the 4th quarter payment (or file, if before the end of January), that you can STILL be assessed penalties and interest? My husband had a large bonus paid the other day (he gets a bonus every March and it hasn't required estimated payments), but he also got RSUs paid for the first time a couple of weeks ago. While the company did withhold, I'm not sure what percentage from the RSUs, they withheld less than our marginal rate from the bonus. Those two things coupled with a planned Roth conversion later in the year (may wait until the last quarter, though if the stock market drops a lot it may be any time) make me nervous that we may not be withholding enough, especially in the first quarter and if we make the Roth conversion(s) all in one quarter (hopefully not this month, but if there's a 20% drop in the market we should probably take advantage of it). So how can you do a trial run of form 2210 now based on the first quarter income, and make sure to pay enough? I tried the IRS's online calculator and it just said after I entered income to date that we were withholding too much and would get a $25,000 or something refund. Four times our first quarter income would put us in the 35% bracket, but when I project how much our income for the next 3 quarters will be (including a Roth conversion), we're only going to be in the 24% bracket. So do we make an estimated payment based on what our tax would be in the 35% bracket (income more than $100,000 over what I know it's going to be), divided by 4, minus what has been withheld to date? Then make no more payments? If we do the Roth conversion in April do we do the same thing, take half of the tax that would be due on that inflated income, subtract what we've already paid from being withheld January-March, plus the April 15 estimated payment, minus what will be withheld April-June, and make up the difference in the June 15 payment? Then adjust our withholding for the rest of the year so that what ends up being withheld, plus the 2 estimated payments, is within $1000 of our real tax bill (or even slightly more so that we get a refund), just to avoid a penalty for underwithholding the first half of the year?