I was inconvenienced during the last federal government shut down, when the accountant I hired for my late parents’ Trust couldn’t file the taxes electronically. Everything was mailed to me and I had to take care of signing and sending it all in myself. The Registered Mail card confirming receipt was never returned by the IRS.
My application for Social Security benefits is currently being processed. If the U.S. gov’t. shuts down after 12:01 AM on Friday, the validation will be put on hold for the duration, and undoubtedly delayed further after that. Grrr…