Want to pay the charges on your postpay threshold account? You don't have to wait until your next billing cycle.
From the top menu, select Tools > Billing & Payments > Billing summary.
If you're using the new Microsoft Advertising navigation, from the navigation menu on the left, hover over Billing and select Payments > Billing summary.
To see the list of currencies and payment methods acccepted for your billing country/region, see Choosing a payment method for Microsoft Advertising. And, if you want to review whether a prepay account or a postpay threshold account works best for your needs, see What are my billing options? Pay now or pay later.
You cannot pay only a portion of your account balance. When you make a payment, your entire account balance is charged to your primary payment method.