Quote:
Originally Posted by Mathgod
So is it a requirement to pay in advance or an option?
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It depends. If you owe more than a small amount of taxes at the end of the year and didn't install after getting that you'll pay penalties/interest. (And maybe interest on the penalties, and penalties for not paying the interest, etc).
If it was truly a one-time thing that caused your income to increase and it definitely won't happen again then you can ignore it and it isn't an issue.
But if you might owe again I'd pay them (I always pay mine because I owe every year). The risk-reward of not paying isn't that great, imo