While business rates are formulated based on the open market rental value of a property they are charged in addition to rent. 

If you own the property then rates will be due to the local council on top of any commercial mortgage payments. 

If you rent the property you will need to check the terms of your lease as to if your rent and rates payments are made in one lump sum to the landlord who then deals with all business rates payments on your behalf, or if you are responsible for paying the rates direct to the council on top of your rent to your landlord. 

To find the RV of your property in order to estimate the amount of rates that will be due you can click here and enter your postcode.