Accounting for 10% Property Management, what about 1st month rent

[Rijm D.]

I do and I see everyone accounting for around 10% for PM service, but where and how do you account for the 1st month rent they may charge? Or is that not the norm and most really just take $90 of $900 rent to move a new tenant in? I feel first month rent is steep and invites the incentive to create a higher turnover for their benefit. Or should there be a renter guarantee for 1 year stay or on longer term lease agreements?