How did Trump go from owing the IRS $750 in 2017 to $999,466 in 2018?

I feel a wave of financial scandals hitting Trump soon…

And in 2020 he lost 4.8 billion, perhaps why he was slow to initiate anti-Covid measures.
How did Trump go from owing the IRS $750 in 2017 to $999,466 in 2018?
How did Trump go from owing the IRS $750 in 2017 to $999,466 in 2018?
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