India's recent tax reforms have strengthened investor confidence and reduced uncertainty, and the next phase of reforms will now focus on achieving "multilateral certainties", Principal Commissioner of Income Tax Raman Chopra said today. "Multilateral certainties are required and we are working on them as a continuous process. Once the decision is taken and when it has to come, it will certainly come forward," he said, referring to the multilateral tax certainty framework, on the sidelines of the International Tax Summit in New Delhi.