> Three important words: Home Equity Loan
A tax lien is a public record. Banks will subtract the amount of outstanding liens against the property (even if not yet due) from its estimated value before deciding how much to loan against it. Yes, the amount will be smaller than it was.
> Everything you hoped to get out of the house is owed to the state.
You need to look at some actual numbers.
Let's say the original purchase price is $X. Let's say that the property appreciates 10% per year for 3 years, and then in the fourth year, the market tanks. What happens? At the 1% tax rate mandated by Prop. 13 [see below], the total tax due for the first three years is 3.3% of X. The total tax paid is 3.06% of X, leaving a lien on .24% of X. Okay, then the market tanks. If it tanks 10%, the property is still worth 1.197X -- the owner has almost a 20% gain; the .24% is hardly noticeable. If the market tanks 20%, the owner still has a 6.4% gain; the tax lien is still less than 4% of the gain. The market has to tank a full 25% -- a massive collapse, well into recession territory -- to wipe out the owner's gain completely and make that .24% start to hurt a little.
Okay, now let's try a scenario where the 10% appreciation continues for 10 years. The total tax is 15.9% of X. The total amount paid is 10.9% of X, leaving a lien on 5%. But in the tenth year, before the market tanks, the property value has more than doubled to 2.59X! Even if the market crashed an unimaginable 50%, the tax would still be a small fraction of the owner's gain.
Now, about the tax rate. It's true that in my original post I suggested that tax rates could be set by the locality instead of being capped at the 1% limit Prop. 13 imposed. The replies to the effect that that's unrealistic are probably right; as a political matter, that limit probably can't be raised. But just as a thought experiment, if we imagine that the tax rate is 2% rather than 1%, it doesn't change the outcome very much.
Play with more scenarios if you like. If you can come up with one that shows a problem, I'd love to see it.