Income question in relation to auto loan application

[kskajohnson]

I'm in the market for a new vehicle (or gently used) as I have mentioned in an earlier post but I am a bit foggy as to how using spouses income works (as in, if you can legally do it). 

I am applying for the loan myself with my own credit.  My spouse is unable to co-sign on our loan as she is about halfway through a Ch. 13 bankruptcy as a result of a previous marriage/some health issues.  

The kicker here is that she makes about 3x what I do and I was going to see if I could use her income (in addition to mine, of course) without her being on the application.  I noticed the question on one of the apps that I've seen mentioned something about asking "income used to pay for loan" or soemthing along those lines. 

Is there a law/rule against doing this or is this something I would be able to do?  

$125,000 total on an app looks much better than $40,000 for just me.  

Edit:  By the way,  I'm looking at applying for around 22-25K.  My Ex FICO is a 685.

Thanks!

[SamsungHDTV]

Being able to use your spouses income depends on which state you are in. I know here in Texas, we are able to use spouse's income if its the intent to depend on the spouse's income to repay the debt. But, I don't think you can use spouse's income without spouse being on the application. I may be wrong about this part.

[kskajohnson]

Im in Washington State. 

I'll have to look into local laws then.

Thanks!

[N7]

I got approved for a 25-26k auto with a income of 31k