The renewal price is the same as the original price. The current price for an annual subscription covering a single device is $39.99 + taxes per year. In the following year, the renewal price will be the same, but the final price may vary as applied taxes may change.
If you received a discount on your original purchase, the renewal charge will be at the regular listed price. You can also upgrade your license at any time to add new devices and extend the license term. The upgrade cost is currently $10 per an additional device.
If you have a lifetime license, you do not have to renew it. Your license never expires. Malwarebytes no longer sells lifetime licenses.