Next.js and Supabase Tax Tracking App

I need a developer to build a web app with a dashboard tracking income tax. Control de Retenciones is a web application designed for businesses in Honduras to manage and control tax withholding documents. The system allows users to register and manage withholding certificates, control fiscal correlatives, generate and print withholding documents, maintain customer/supplier information, and produce reports for accounting and administrative purposes. The application includes authentication and user management, centralized data storage, document generation, and cloud-based access. Please discribed how much time could it take and the cost