I have an investment account that I'd like to reposition some of my holdings from. For tax purposes, can I offset a long term capital gain with a short term capital loss or do I have to match long term gains with long term losses, etc?

Secondly, if I have a long term or short term loss, and I have no offsetting gains in the same tax year, what, if any of the respective losses can I carry over into subsequent tax years?

Many Thanks. :)

The sales are reported on schedule D where short term gains and loss are reported separately and long term gains and loss are reported separately. Then you will have net short term gain or loss and long term gain or loss.

Then the figures for short term and long terms add to give net capital gain or loss. If you have net capital loss, you can adjust only $3,000 in a year against other income, and rest is carry forward.