Interesting. How does this interact with something trivial like remortgaging a house? Say I bought a house for 100k, cash. Now it's worth 200k. I want to take

Interesting. How does this interact with something trivial like remortgaging a house? Say I bought a house for 100k, cash. Now it's worth 200k. I want to take another 50k mortgage on it. Do I realize cap gains on 25% of my house, i.e. an increase of value on 25k to 50k, and then I'm liable for cap gains on 25k? At 20% say, that's 5k tax. Unpleasant for sure, but doesn't seem out of proportion.