收到税务局的notice：
Your net capital loss for 2015 is $AAA. You can use this amount to reduce any taxable capital
gains that you report in other years. For more information, see Guide T4037, Capital Gains.
As of the date of this notice, you have unused net capital losses from other years of $BBB. You
can use your unused net capital losses to reduce taxable capital gains that you report this year. If
you apply this amount to another year, you may have to recalculate your unused balance. This is
because of the different capital gains rates for those years. For more information, see Guide T4037,
Capital Gains.
有几个问题：
1）$AAA和$BBB什么时候能用呢？是看以后哪年有capital gain才能用吗？$AAA和$BBB会一直在吗如果没有被用上？
2）上面提到的recalculate your unused balance是怎么回事？
Your net capital loss for 2015 is $AAA. You can use this amount to reduce any taxable capital
gains that you report in other years. For more information, see Guide T4037, Capital Gains.
As of the date of this notice, you have unused net capital losses from other years of $BBB. You
can use your unused net capital losses to reduce taxable capital gains that you report this year. If
you apply this amount to another year, you may have to recalculate your unused balance. This is
because of the different capital gains rates for those years. For more information, see Guide T4037,
Capital Gains.
有几个问题：
1）$AAA和$BBB什么时候能用呢？是看以后哪年有capital gain才能用吗？$AAA和$BBB会一直在吗如果没有被用上？
2）上面提到的recalculate your unused balance是怎么回事？