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Underpayment Penalty

A penalty for not paying enough total estimated tax and withholding by April 15. You can avoid underpayment penalties by opting to pay either 100 percent of last year's tax or 90 percent of this year's tax in combined estimated and withholding tax payments.

2012 Online Tax Software

TurboTax

TaxACT

H&R Block At Home

CompleteTax