Do you have to pay a capital gain tax if you transfer all your stock to your daughter?

Yes, transferring stock to your daughter may trigger capital gains tax if the transfer is considered a sale or if the stock has appreciated in value. Generally, gifts of stock are subject to gift tax regulations, but the recipient (your daughter) would take on your cost basis for the stock. If she later sells the stock, she may owe capital gains tax based on the difference between the selling price and your original purchase price. It's advisable to consult with a tax professional for specific guidance.