After selling a house, I've now added a large long-term Capital Gains amount to my taxes this year. Knowing this was likely (and thanks to earlier advice), I set my withholding this year so I am well over the "Safe Harbor" amount based on last year's taxes but with the current figures I am still likely to owe a large amount next year.
I'm thinking I would rather make one large payment now directly out of the money I received for the house rather than either increase my withholding and see a very small paycheck, or wait till next year to face a large bill.
Looking at the comment on this question How can I make a one-time income tax prepayment to the US Treasury? it says "if you want to make a prepayment that is fine". However, in that question they were in the last quarter - would I need to make two equal payments as we are in the third quarter?
Other than the loss of possible interest on this money are there any pitfalls to doing this? (eg attract the attention of the IRS, add confusion to my tax return next year, etc)