If we do not make a profit on the rental property and the tenants just pay the mortgage payment do we still put $0 on the 2020 rental income?

[Critter-3]

NO ... you MUST enter ALL the rent paid  along with ALL the expenses on the Sch E  if the tenants pay a fair market rate.  What the amount they pay covers or doesn't cover is immaterial.

If they are  not paying the FMV the all the rent paid is entered on the Sch 1 line 8  as a not for profit rental and you don't get to deduct the expenses.  

If this is your first time filing a rental you probably should use a paid tax pro so you can get educated on how to file what you have. 

[VolvoGirl]

And you can't deduct the whole mortgage payment, only the interest and property tax.   For the loan principal amount you add the rental as an Asset at the cost and depreciate it over 27 1/2 years.

[Mike9241]

assuming this is a for-profit rental, then the mortgage payments your tenants make are rental income.