“With U.S. debt now at $35.3 trillion, the cost of paying the interest on all that borrowing has soared recently and now averages out to $3 billion a day, according to Apollo chief economist Torsten Sløk…If the Fed cuts interest rates by 1%-point and the entire yield curve declines by 1%-point, then daily interest expenses will decline from $3 billion per day to $2.5 billion per day.”
(Behind paywall but you may be able to get limited access to the article.)
U.S. debt crisis: Interest costs reach $3 billion a day | Fortune