Accountable isn’t a typical tax refund tool, but a holistic mobile app to help you become self-employed. It helps you connect expenses, and to create and manage invoices, paired with information on VAT and tax deductibility. The goal is to help you optimize your taxes early on in your business processes and manage it all from beginning to end. Their blog also has many resources, tips, and tricks for students, budding entrepreneurs, and professionals ready to take the plunge in to being self-employed.