Because on the new W4 2020 and later the deduction is a dollar amount.

It reads, multiply the number of children by $2,000. So, two kids = $4,000

Then it says, multiply the number of other dependents by $500.00. So, one non working spouse = $500

That gives me a total of $4,500.00. 

The spot to put that dollar amount in QuickBooks under Form 2020 or later looks like this:

"Claim Dependents 0.00" 

^ That doesn't appear to be a spot to enter $4,500.00 to me...so what do we put? 4.5? No one knows.