Talking of individual finance here. As long as you're sufficiently liquid again to PIF before your bills go past due, you're fine. If you're not, then not only do you accrue late fees - usually easy to have waived by just calling and asking for it, if you've been a highly diligent customer prior - but you also start accruing interest on the balances you're suddenly carrying, and you almost certainly lose preferred rates on those balances and find yourself paying north of 15% APR.