Could someone please explain to me..

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12. i not sure about that. i think they only need it to fit into the original budget

if the original budget allocates $4 trillion for a tax cut, then i think all the reconciliation bill needs to do under reconciliation rules is to not cost more than $4 trillion.

of course, getting the original budget passed in the first place with such a big gaping hole is a problem in and of itself, though the politics of passing budget bills is different from the politics of passing an isolated tax cut bill.