I want to trade my old computer for new but want to keep old until I have new. Can I use credit to buy new computer

Welcome to the Apple Support Communities.

I suggest you refer to Apple Trade In - Apple. For more questions, contact Apple here.

Jack

I agree with Jack's suggestion. Basically, the process is as follows.

• Apple will ask you to describe what Apple product you are trading in. Then they will give you an estimated value, subject to confirmation after receipt of your old computer.
• After you receive your new computer, you can transfer your files and data to the new computer using Migration Assistant.
• You then return the old computer to Apple using the provided pre-paid return label.
• You then enjoy using your new computer.