Good question. Sales Tax - also known as VAT or GST depending on where you live - is a tax charged on the supply of goods or services. My watch strap is generally registered for Sales Tax in all of the countries it ships to, so we'll charge you the Sales Tax as part of the checkout process. We collect Sales Tax from you on behalf of the local tax authorities. We then pay this over to the local tax authority, so we don't keep any of the money for ourselves.