Non-disclousre is the state law in Texas, so unless you report it yourself, how does the county know what did you pay in Dallas? I've looked on Zillow and some houses in Dallas do seem to show price per sq. foot on sales (no total price though) and some don't. Same with Austin, I figure if the price was the public record it would have been shown as same as it shows on houses in CA - the price of the house on every time it's sold so I doubt what you say is true. Perhaps you meant it might be set to the listing price?