The high-water mark
Profit share is charged on new profit above the highest balance your copy account has previously reached with that provider. If you deposit $10,000 and grow to $12,000, share is charged on the $2,000. If you then fall to $11,000 and recover to $12,500, share is charged only on the $500 above the old peak — not on the $1,500 recovery. You never pay twice for the same ground.