Quarterly Tax Reminder...

[Six_of_One]

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Generally, you should make estimated tax payments if you will owe tax of $1,000 or more, after withholding and credits.

Federal Quarterly Tax Forms
www.irs.gov/pub/irs-pdf/f1040es.pdf

Pay Federal Tax Online
www.eftps.gov

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As I understand it, one exception is if your 2005 withholdings (assuming you also have a "regular" job) will at least equal your 2004 tax liabilitiy. If that is true, you will not be penalized for not paying quarterly.