Level 9
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“Where’s My Refund? is available almost all of the time. However, our system is not available every Monday, early, from 12:00 am (Midnight) to 3:00 am Eastern Time.
Our Change of Address and Refund Trace features are not available during the following times (Eastern Time):

Sunday 12:00 am (Midnight) to 7:00 pm
Monday 12:00 am (Midnight) to 6:00 am
Tuesday 3:30 am to 6:00 am
Wednesday 3:30 am to 6:00 am
Thursday 3:30 am to 6:00 am
Friday 3:30 am to 6:00 am
Saturday 3:30 am to 6:00 am
and 9:00 pm to Midnight

Also, occasionally our system may be unavailable on Sundays between 1:00 am and 7:00 am Eastern Time.”