Can I pay my Apple Music balance with gift card

Your Apple ID balance is used first yes, though you will still need an associated payment method on file for any active subscription including Apple Music.

weez289 wrote:

I have a $50 balance on my Apple ID account and I will like to pay my $11 dollar subscription. How do I apply that towards my bill

Your Apple ID balance is used first, then—if the balance associated with your Apple ID is insufficient—your associated payment method will be debited.

Here is a longer write-up: https://www.idownloadblog.com/2021/11/17/apple-id-balance/