You are correct that the commentary states that you calculate Estimated Closing Costs Financed (Paid from you Loan Amount) by subtracting the estimated total amount of payments to third parties not otherwise disclosed in 1026.37(f) Loan Costs and (g) Other Costs. The “other” third parties that this is referring to would be the amount paid to the seller if it is a purchase transaction or the amount paid to other debtors if it is a refinance and you have payoffs. So for an example:
Refinance Transaction with Cash Out:
Loan Amount = $250,0000
Payoff of Debts in Loan = $200,000
Result is = $50,000
So this positive result would be disclosed as a negative number to the extent that is doesn’t exceed closing costs. If Closing Costs = $5,000, then it would be disclosed as a negative $5,000. If the result above had been a negative or a zero, the amount would be disclosed as a $0.
This detail can be found in the commentary at 1026.37(h)(1)(ii)-1. There is another example of this in preamble to the regulation as well:
https://www.consumerfinance.gov/eregulations/sxs/1026-37-h-1-ii/2013-28210?from_version=2015-01321