Here are Reg. Z's basic rules:
1. All FCs are reflected in the APR.
2. All PFCs are FCs.
3. Fees that are neither FCs nor part of the AF are not reflected in the APR calculation.
Most Reg. Z enthusiasts eventually create a fee grid. Sometimes the grid has separate sections for different product types.
Columns describing each fee are good. This information explains your bank's business decisions regarding fees and can include the circumstances when the fee is appropriate, how it is calculated, minimum/maximum amounts, and other internal pricing decisions.
Next, you need a column to classify each fee as a FC or not. Actually, there can be more than just the Y/N classification. Certain fees can be classified both ways, depending on the circumstances. Appraisal charges are a good example. In loans secured by real property, they are not FCs. If the loan is secured by personal property (jewelry, art, antiques, etc.), appraisal fees are FCs.
Since you will need to document each fee decision, it's a good idea to include a column to cite the chapter and verse where the reg addresses the fee. It will be very handy to pull out this scorecard if you are challenged by an examiner at a later date.
The next column can be used to flag those fees that are both FCs and also PFCs. Here, you review your lending practices to determine the timing of collection of the fee. For Reg. Z purposes, the only thing that matters is whether the fee is collected (a.) after consummation, or (b.) earlier. If the fee is collected afterwards, it is a garden variety FC and part of the payment schedule. FCs collected at or before consummation get the special designation of "prepaid finance charge" and become a deduction when calculating the Amount Financed. Both types of FCs end up in the total disclosed FC.
Special case: There are always exceptions when you are dealing with Reg. Z, and the FC/PFC determination is one of them. Although not collected at or before consummation, any FC that is netted out of a delayed advance must be treated as a PFC. The best example of this exception is construction inspection fees. They are always FCs, but some construction lenders net them out of draws and other lenders choose to send a bill. If netted, these fees become PFCs; if billed, they are disclosed as ordinary FCs.
The APR is affected by changes in the payment schedule and changes in the AF, so both FC collection methods will impact the APR.
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...gone fishing.