Unfortunately, the best you can do is send in the amount you think you will owe as soon as possible. This will at least reduce any underpayment penalties. That said, you may be okay since the sale won't complete until this month (according to what I read in your post). Include a statement with your tax return explaining the situation (and why no estimates were paid). The IRS is a pay-as-you-earn type of system. That means that taxes are owed income is earned. If penalties are assessed, you may request an Abatement due to the situation. Please see the following about Penalty Abatements at the IRS website. IRS Penalty Relief
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