Optimal is a Tax Revenue Management solution designed to Improve taxpayers’ experience when doing business with the Guyana Revenue Authority. It provides a convenient and intuitive online service which will allow you to, among other things, submit returns online at any time. Taxpayers will experience a faster and more efficient processing of tax transactions including refunds. You can easily view tax information in real time, with greater transparency in your interactions with us.  There will be new ways to effortlessly communicate with the GRA, and more services available at a location near you.  Optimal allows us to serve you better.