From the IRS: https://www.google.com/search?q=irs+code+576&sxsrf=APq-WBuD2_vZhZwbKcWP_DfO56AvI7iBNA%3A164764062414...
576 Unallowable Tax Hold
Holds the Unallowable Tax to the extent of the Credit Balance in suspense. Freezes the amount of the TC 576 from refund and offset out.
Code 576 is a tax hold ( of some kind for any reason) ... the future date is an estimate of when the issue could be dealt with and then a code 577 would replace it. There is nothing you can do about this but wait for the IRS to complete the process.
