How much tax on $2600 capital gain

[Phillip1]

It depend on all of your income, the holding term (short or long term) and your filing status.

If the gain is long term your filing status is in the 10-15% regular tax bracket (including the capital gains) the tax will be zero on that gain income. If you are in the 25-35% regular tax bracket, the tax on the gain will be 15% or 390 dollars. If you are in the 39.6% bracket, the tax will be 20% or 520 dollars.