Processing simply means that the IRS is working on your return, it is the stage after accepted and before being approved. Here is more information on what's happening with your return
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The IRS has not shut down completely. To protect the public and employees, and in compliance with orders of local health authorities around the country, certain IRS services such as live assistance on telephones, processing paper tax returns and responding to correspondence are extremely limited or suspended until further notice. While, you may not be able to enter one of their offices they are still working on returns, however at a slower rate due to limited resources. Although the tax filing deadline has been extended to July 15, 2020, from April 15, the IRS continues to process electronic tax returns, issue direct deposit refunds and accept electronic payments. As of April 3, the IRS received over 97.4 million tax returns and issued over $213 billion in refunds. https://www.irs.gov/newsroom/irs-operations-during-covid-19-mission-critical-functions-continue
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