There is no hard and fast rule that I know of. With that knowledge I would not accrue, why accrue what you know you won't get? Then write it off later?
If they don't have a repayment plan with the court or have a re-affirmation agreement we stop accruing. I would rather book extra income later than explain why I accrued interest on an account we knew we wouldn't recover on.
Just MHO, hopefully a GURU will put their 2 cents in too.
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Going to church doesn't make you a christian any more that standing in your garage makes you a car.