Disaster Tax Relief Act of 2020 This bill sets forth tax relief provisions for taxpayers residing in a disaster zone. Specifically, the bill allows penalty-free qualified disaster distributions from tax-exempt retirement plans up to $100,000, allows recontributions of distributions for home purchases cancelled due to disasters, increases to $100,000 the limit on loans from retirement plans not treated as distributions, allows an employee retention tax credit for 40% of wages paid by employers affected by a disaster, expands eligibility for disaster-related personal casualty losses, permits the calculation of the earned income tax credit based upon income earned prior to 2020, and suspends the limitation on corporate charitable contributions.