Section 8 tenant portion of the rent

[William Price]

Hi,

I'm getting ready to rent a duplex to a Section 8 tenant and I have 2 prospective tenants.  They both have vouchers and I wanted to ask them what portion of the rent they are responsible for.  

The rent is $1,800 and in the past my tenants have been responsible for anywhere from $450/month to zero.  I want to pick the tenant who has the highest amount paid for by the government.  Is it legal to ask them how much of the monthly rent they pay on their own?

Thanks for any insight!