Bidens original bbb had many permanent provisions. It was the battling and munchkin that inserted more temp provisions. He did so likely banking on the republikklans regaining control and being able to cancel everything.
Again, when able to raise the super rich tax bracket to pay a fair tax, this was a large amount to fund the bbb. Of course mitch and munchkin killed all that too.
Note the 'what if' clauses throughout their 'estimate'
The Congressional Budget Office (CBO) today released an estimate of how much it would cost to make most temporary provisions in the House-passed Build Back Better Act permanent. Under assumptions requested by Ranking Members of the Budget Committees, CBO finds a permanent version of the Build Back Better Act with no further offsets would increase budget deficits by $2.75 trillion before interest, as opposed to by $158 billion as the bill is written. Though CBO does not score gross costs, we find the gross cost of the bill would rise from $2.40 trillion to $4.73 trillion using CBO's numbers.
Importantly, these estimates do not reflect what is actually written in the Build Back Better Act nor its official cost for scorekeeping purposes. Lawmakers may choose to allow some provisions to expire, to extend some as written, and to modify some. To offset the cost of extending these provisions as President Biden has committed, they would need to more than double current offsets in the bill. Extending programs without these offsets would substantially increase in the debt. $3 trillion of new debt would increase debt to over 116 percent of Gross Domestic Product in 2031, up from 107.5 percent under current law.