For digital items, Bandcamp’s fee is 15%. This rate drops to 10% as soon as you reach $5,000 USD in sales (and stays there, provided you’ve made at least $5,000 in the past 12 months).
For physical items, Bandcamp’s fee is 10%. Shipping and tax, if applicable, are not included when calculating this fee.
Payment processor fees are separate and vary by transaction size, but typically range between 4 and 6%. Please see the details for digital items here, and physical items here, including tips on what you can do to minimize those fees.
A note about higher-priced items:
Because expensive items are sometimes sold through Bandcamp (like deluxe packages and beat licenses), and because superfans occasionally use name-your-price to pay hundreds of dollars for a single album or track, the revenue share applies to the first $100 of an item only (or the item total when more than one of that item is purchased).