How to get Apple ID balance to zero ?

Buy something more expensive than your balance and pay the rest with a credit card or if you have less store credit than the cost of a single item and cannot add a credit card to your account, contact Apple Support so they can clear it.

Click the blue link above to have Apple Support clear your balance.

Hello! Thank you for using Apple Support Community.

If you are trying to zero your balance and still have a valid credit or debit card, you may purchase an item from the App or iTunes Stores for more than your balance. The remainder will be billed to your card, leaving you with nothing in your account balance.

Alternatively, you could ask Apple Support to remove and keep the balance. Remember that the people on this forum are just other Apple products users like yourself and are unable to do this for you. Use this link Apple provides to take you directly to the managing and editing an Apple ID people who will do this for you --> https://getsupport.apple.com/?caller=kbase&PGF=PGF63005&category_id=SC0998&symptom_id=20198

Alternatively give Apple a call:

Contact Apple for support and service - Apple Support

If you are asking about this because you are changing regions, take a look at this article:

Change your Apple ID country or region - Apple Support

Have a great day!