How can I estimate taxes owed with a 1099?

Java

Use an online calculator like this one

Java/Tax1040.html">http://www.dinkytown.net/Java/Tax1040.html

to estimate what your total tax for the year will be from all sources.

Then subtract any tax that will be withheld (if you or your spouse have a regular job in addition to the 1099).

And don't forget state taxes!