Abstract: A web-based software application accessible by subscribers via the internet at: http://cstore.saltwaretax.com, which allows convenience store and similar retail store owners to calculate Texas sales and use taxes by entering their purchases manually or by importing records electronically. The application connects to a database named “Cstore” which stores taxability decisions for convenience store products and expenses and is used by the application to calculate the sales tax payable. The subscriber may also upload digital images of transaction invoices to be stored electronically for future reference.