SF to prohibit employers from asking for salary history to close gender wage gap
sfexaminer.com
sfexaminer.com
But required for lots of stuff. E.g. 1098 for employment, tax returns for getting a loan.
That would have been my response.
That said, a better way to defuse the question without lying is to say something like "My former employers consider salary data confidential as I'm sure you do too, but my expected salary for this role is [true_target * math.randrange(1.1, 1.4)]."
If a company wants my salary data I'll be happy be to provide it as soon as they provide me their accounting books. I wouldn't want to ask for too low a salary if I knew they could afford more
2 ) Assertive behavior like refusing to reveal past salary is viewed (consciously or unconsciously) as a positive trait in men and a negative one in women. This puts women at a disadvantage during salary negotiations generally, and specifically when asked to provide information that will prevent them from entering a position with a higher salary.