Hi Bernie,
So tax credit and conventional properties will be different. Tax credit properties typically have a running delinquency due to the nature of how they receive their funds.
On conventional properties the goal should always be 0%. That being said anything below 3% would be considered acceptable in situations with pending evictions or other extenuating circumstances and below 1% as the standard. You will also typically see delinquency bonuses for whoever is in charge of collecting the funds.
Happy collecting!