[quote name='shrike4242']You will get the credit back, as long as the credit would still be valid in the timeframe you're doing from the return.
If the $10 credit you used would still be valid today and you did the return today, the $10 would go back into your account. If the $10 credit wouldn't be valid today and you did the return today, then you wouldn't get it back.
I also speak from experience on that one.[/QUOTE]
I think it depends on where the credit comes from. If it's a promotional credit, you won't get it back. Here's the text of the email they sent to me when I had a return on an item that I used my promotional credit on:
[quote name='Amazon CR email to torifile']
I've checked your account and see that we received your return and refunded the amount originally charged to your credit card, $xx.xx.
Any promotional funds used toward your purchase are not refunded. Promotional funds work much like coupons in a physical store--if you return the item, you're refunded for the amount you paid out of pocket, and not for the amount of the coupon.
I'm sorry for any misunderstanding. I've included some additional information below in case it's helpful.
Regarding the order #[order number] :
I checked the item "Mass Effect 2", and see that this item doesn't have any promotional offers listed on our website. So, we couldn't honor you the promotion.
Restrictions for promotional offers vary, but the details for specific promotions are available on our website.
I hope you'll be able to take advantage of future promotions. We look forward to seeing you again soon.
[/quote]
Where was the credit from/how did you get it? In my case, it was a promotional credit for pre-ordering MW2 that I used on another game. I returned the game but didn't automatically get the promo credit back. I had to email them specifically about it.