In fact, he is entitled to the rate relief from the day he went into the service over a year ago - not just from when he was deployed to Afghanistan. His deployment to Afghanistan is irrelevant to SSCRA relief. Being drafted vs. volunteering is also not an issue. There hasn't been anyone drafted into the US military since 1974, so if that was the criteria, no one would even be talking about SSCRA today.
For example, suppose he had a loan at 9% with your bank since January, 2001. He is entitled to a rate reduction to 6% on that loan effective the day he joined the service just prior to 9/11/01. You'll need to go back to that point in time and make some adjustments.
But suppose he took out a loan with your bank in October, 2001 at 9%. He is not entitled, under SSCRA, to any relief on this loan even though he is now deployed to Afghanistan. He entered into the loan after he entered military service. You may want to, however, consider forbearance if he becomes delinquent on this debt while he's in Afghanistan, because of the potential negative publicity. But you are under no obligation to reduce this interest rate or provide any other relief under SSCRA.
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Jim Bedsole, CRCM, CBA, CFSA, CAFP
My posts - my opinions