Good info, Roger. I would add, however, that the governing docs must be consulted to see if there already exists a collection policy and if late fines/etc are allowable. Seeing how often you post, I know you were thinking that!
Denise - I'm in a 19 unit townhome complex, and we have two owners who are GROSSLY overdue on dues ($900/year). We've just developed a Debt Collection Policy, and I'm implementing it slowly. One owner has agreed to a repayment plan. He agrees to be completely paid up by July 1, 2010, or the association will file a lien (he's waived the 30/60/90 day letter policy). The other owner is an older lady with dementia (moved away from Colorado), and her family is squatting in her house and not paying her rent or paying assessments (which, of course, are not the responsibility of anyone other than the owner). This one, I'm just going through the policy, and I'm ready to send out the 60 day letter (I sent a 30 day, will send a 60 day, will send a 90 day, and then the lien is filed.) I MAY contact an elder services agency in the city she lives in now, to see if someone will try to protect her rights. I need to protect the rights of the HOA, but her rights also need to be protected, along with her asset.
Oh, and I'm not in your exact situation, because these two owners are not impacting our ability to pay bills. Just impacting our ability to save money.
Good luck. I know there have been posts about using collection agencies versus a lawyer versus trying to collect yourselves. Search them, and then see what your docs and the state/county/local statutes say. Develop a policy, and stick to it (while allowing for individual circumstances). The one owner who's late was in a really bad car accident with no health insurance. A bit of leniency for him (he's owned his unit for over 10 years) is appropriate in his situation. I will NOT recommend foreclosure of his unit until all other options have been exhausted.