evidence: Last month, we estimated the Build Back Better Act in the House of Representatives would cost $4.9 trillion if made permanent and add $3 trillion to the debt if extensions were not offset. Based on CBO's score of the House-passed Build Back Better Act, this update of our prior analysis finds extensions would nearly double the cost of the bill from over $2.4 trillion to nearly $4.8 trillion. If all extensions were enacted without offsets, it would increase the deficit impact of the bill from $158 billion to $2.8 trillion. [...] Excluding changes to the state and local tax (SALT) deduction, we estimate the Build Back Better Act would cost roughly $2.15 trillion as written. We estimate making all of these temporary policies permanent would cost over $2 trillion, nearly doubling the gross cost of the bill excluding SALT changes to $4.2 trillion through 2031. [...] As written, the Build Back Better Act would increase deficits by $750 billion over the first five years and a total of $160 billion through 2031 (it would reduce deficits by nearly $600 billion in the second five years). If the legislation were made permanent without additional offsets, it would add nearly $1.4 trillion to deficits over five years and increase deficits by $2.8 trillion through 2031.