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How about df -kP /home | awk 'NR>1 {print ($5+0 > 80)?"exceeds":"doesn''t"}'

NR > 1 skips the first (= header) line in awk. shell's parameter expansion ${percent%*%} (no "a"!) removes the trailing % sign.

It will not, due to syntactical and semantical errors:
- IF...

You better use df -kP or df -k in a script.
The % in bash/ksh/ash/psh can be chopped off.
percent=`df -kP /home/. | awk 'NR>1 {print $5}'`
percent=${percent%*%}
or
percent=`df -kP /home/. |...