"Runnybottom: I work in a male dominated profession (corporate law) and encounter discrimination regularly. I've been paid less than a male equivalent colleague and tried to jump through the hoops to get it sorted without being "let go". Believe me, I know discrimination personally. I assume from your post that you do too.
Due to my job I have high expectations of being treated equally as a person in the workplace, hence my frustration at the mortgage company assuming I'm going to bin my hard-fought career "because lots of women don't go back to work"
Ummmmm you totally contradict yourself there. Are you discriminated against at work or are you treated as equal to men?
I have also experienced discrimination at work FWIW, and it is shitty, but the mortgage thing is different IMO.
The point about me deciding whether to return to work: how is that any different from my husband deciding to give up his job? His word is enough when it comes to confirming his intention to continue to work, why isn't mine? I don't see why they can be any less sure of me working than him."
Because most men don't suddenly completely jack their jobs in without something pretty huge happening. Especially men with families and a mortgage.
Like it or not, it is usually women who pack in work or go part time after a baby. Even if it wasn't, and your DH became a SAHD, or went part time, your family income would still be much less.
They have the statistics and they are using them to form their lending criteria. Their criteria say that they may not take women's usual income into account if they are on mat leave, because statistically there is a good chance that they will stop working or go part time at the end of their mat leave.