Sorry, please forgive my rather basic question: Say you buy bank shares for 20K and they are now +/- worthless, so you have a capital loss of 20K.
You now buy €20K's worth of shares in some other company, they double in a year to €40K, and you sell. Ignoring annual exemption to keep things simple, you now have a capital gain of €20K, which ordinarily is taxed at 30% (/), so the tax due is €6K.
However, because you have 20K in losses in the same asset class, no tax is due
Q. Have you now "used up" your full capital gains offset, or have you still got 14K "left" going forward ie are the €20K in previous losses offfsetable against the gross capital gain (20K) or the net tax due(€6K)? As I say, I've ignored the annual allowance of €1270 or whatever it is.