Transaction tax isn't calculated on profit but on the $ value of the purchase.
Well, until we see that explicitly stated in the tax proposal, I am under the impression it will be on profits made, not "notional value".
I mean, what country charges a tax on people who LOSE money? I cannot recall the last time I heard of someone saying they paid taxes on negative income.
. It gets even worse, you pay 25% on profit made but are unable to deduct losses. For example: