To cancel Spotify Premium without being charged for the next month, you'll need to go through the account settings. On desktop, log in to your Spotify account, click on your profile name, then select Account from the dropdown menu. Scroll down to the Subscription section and click on Change or Cancel. Then, click Cancel Premium and follow the prompts to confirm. On mobile, open the Spotify app, tap Home, then tap the gear icon to access settings. Tap Account, then Subscription, and select Cancel Premium. Make sure to do this before your billing date to avoid being charged for the next month.