While we're generally against extended warranties, AppleCare is one of those warranties that people seem to go with anyway. As these things go, AppleCare's not the worst, and it turns out that you can actually request a refund for unused portions of AppleCare if you sell or trade in your device.
The refund request page was spotted by Macworld, who also breaks down exactly what you can get back:
"Original cost pro-rated for time remaining less the value of any service used and less a cancellation fee of either $50 or 10 per cent of the pro-rated remaining value, whichever is lower." So on a $99 AppleCare+ plan after 12 months exactly and no service incidents, you'd have $49.50 in value left. Since $50 is more than 10 per cent of that amount ($4.95), Apple would subtract that lesser value, for a net of about $44. While not huge, it's not nothing, either. For a computer, it could be larger. A $349 MacBook Pro plan after a year would result in $233 remaining in value, less $23.30, or about $209.
It's not exactly a ton of money or anything, but considering how often people tend to switch out their iPhones or MacBooks, it's a pretty handy deal to know about.
The website will ask you to call them as one of the refund steps, for which the numbers is 1-300-321-456.