If you mailed correspondence to IRS during the shutdown, good luck. The IRS is swamped with inquiries. While the agency was closed, taxpayers sent 400,000 letters, on top of the 1 million items already being processed. Those letters, many of them responses to bills for extra taxes due, sat unopened during the shutdown. It will be a long time before the IRS gets a handle on things. Thus it’s likely that taxpayers who sent in documentation will keep getting notices from IRS.