Do I need to pay estimated taxes quarterly if I make enough trading stocks?

I have a full time job and have started trading stocks few months back. Already I have enough realized gains that will force me to pay additional tax. My question is do I need to pay estimated taxes quarterly based on the profits I have made so far or can I wait till the end of the year to pay my taxes.
Any one who has been in this situation, if you can share your experience, it will be greatly appreciated.

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  1. there is only one quarterly left, Jan.15, 2010
    if you anticipate a huge increase in your tax liability, it would be prudent to file what you think will not be covered by your withholding
    however if your withholding currently is at least as much as your tax liability for 2008 was you should be safe