Ancillary charges refer to the additional fees that businesses may apply to a customer's bill beyond the standard service charge or price. Synonyms for ancillary charges may include add-ons, surcharges, extras, tolls, supplementary fees, or additional costs. These extra charges may include delivery fees, processing fees, handling fees, taxes, or other miscellaneous charges. Ancillary charges are often seen in industries such as travel, where flights may have additional fees for checked luggage, seat selection, or priority boarding. In the hospitality industry, ancillary charges may include charges for in-room amenities or additional guests. Understanding the various ancillary charges is important for budgeting and planning expenses accurately.