If you meet the specific requirements of a backdoor Roth strategy, the conversion is not taxable. Keep in mind, however, a backdoor Roth conversion is an advanced strategy. If you do not meet the specific requirements, you could be subject to unintended tax consequences. Before pursuing this strategy, Fidelity recommends you work with a tax advisor to ensure you're eligible. Learn more about the backdoor Roth strategy in this Viewpoints article about the backdoor Roth strategy.