Grant Street Group | 7,161 followers on LinkedIn. Secure government cloud solutions built to modernize tax collection, e-payment, and financial auction services. | Grant Street Group specializes in cloud-based government solutions for tax collection, e-payments, and auctions. Our applications handle the billing, collection, and distribution of taxes, payment processing, and online auctions of financial and legal instruments. Nearly two-thirds of all property taxes in Florida ($21 billion) are collected using TaxSys®, our fully hosted tax billing and collection solution.