2 HELOC accounts would make things easier ... otherwise revive your third grade math skills you thought you would never need/use and do some prorating.
14 + 5 = 19
14/19 = 74% home improvement
5/19 = 26% personal use
So if the Annual interest paid is say $1000 the ratio is :
$740 to deductible home improvement and
$260 to non deductible personal.
