NIH has announced an updated late policy for the parent institutional training grants which have just a single due date each year. In addition, some NIH ICs have issued late notices for specific funding opportunities, which are posted on the Coronavirus Disease 2019 (COVID-19): Information for NIH Applicants and Recipients of NIH Funding website. For all other Funding Opportunity Announcements NIH is taking a very flexible stance for applications submitted within the standard two week late policy. Applicants should include a cover letter with an explanation for the late submission.
Find this and more frequently asked questions on our COVID-19 Flexibilities FAQ page.