RDP in Washington - How to fill out form 8958

My girlfriend and I (male) are registered domestic partners (RDP). We live in WA which has no income tax to be filed. I file as Single. She files as Single Head of Household. Basically she has W2 income and I have SSA, rental (house owned by me) and IRA distributions.

 

TT filled out form 8958 for  both of us but did not split any amounts, community income or not.  I expected it to do so for W2 and SSA income.

 

Are we supposed to allocate amounts ourselves? If we do, will the allocations automatically show in our respective taxable incomes on form 1040?

 

TT is a little confusing in this area.

 

Thanks!