The plan decrease is applied to the oldest installment amount. For example, if the guarantor originally owed $600 and signed up for a 12 month payment plan of $50/month. The amount was later decreased to $500, after insurance adjustments. What happens to the $100 decrease?
The $100 is dropped starting from the last installment month until it is zeroed out. In this case, Month 11 and Month 12 $50 payments zero out, so the guarantor only owes $500 over 10 months.