Case Study 2 — Fifty Years of APR

A real, public case, approached from the failure side. The APR requirement dates to the Truth in Lending Act of 1968 and has been amended repeatedly since. This account describes the documented structure and the well-established difficulties with it.

Background

Before 1968, a lender could describe the cost of credit however it liked. "Six dollars per hundred per year" and "twelve percent" could describe the same loan, and frequently did — the first sounds smaller. Add-on interest, discount interest, and simple interest all produced different numbers for identical economics, and no consumer could compare two offers without doing arithmetic nobody was equipped to do.

The Truth in Lending Act solved this by mandating a single standardized figure: the annual percentage rate. Every creditor must compute it the same way and disclose it. A borrower with two offers could now compare one number.

It was a genuinely good idea, it fixed a real problem, and it has been the subject of consumer confusion for over fifty years.

The operating issue

The APR does exactly what it was designed to do. The difficulty is that what it was designed to do is not quite what borrowers need, and the gap has four parts.

1. It is not the rate, and the word "rate" is in its name.

This is the whole problem in one sentence. A borrower is quoted 6.625%, receives a disclosure showing 7.253%, and reasonably concludes that either they were misled or the paperwork is wrong. Neither is true. The note rate determines the payment; the APR is a cost comparison figure. But nothing in the name signals that, and the two numbers appear near each other on the same page.

On the Linden Street file the disclosed figures are:

Both correct. Both required. And the second one generates a phone call on a large fraction of files.

2. It assumes the loan is held to maturity, and most loans are not.

The APR amortizes the upfront finance charges across the full term. On a thirty-year loan, \$6,095.34 of prepaid finance charges is spread over 360 months, which makes its rate effect small.

A borrower who sells or refinances in year six paid all of that \$6,095.34 and received one-fifth of the term. Their actual effective cost was materially higher than 7.253%. APR systematically understates the cost of a loan that exits early — and the median American mortgage does not survive thirty years.

The irony is precise: the disclosure designed to prevent borrowers from being misled about cost understates cost in the most common case.

3. It compares badly across loan types.

For an adjustable-rate mortgage the APR must assume future index values. Those assumptions will not be what happens. So an ARM's APR is a projection presented in the same typeface as a fixed loan's computed figure, and comparing them implies a precision that does not exist.

For loans with different mortgage insurance structures the comparison is more informative than comparing note rates — an FHA loan's APR captures its upfront and annual premiums — but it can also mislead, because MIP duration assumptions matter and are not visible in the single number.

4. What it includes is not intuitive.

Regulation Z's line between finance charges and excluded real-estate-related fees is defensible and is not what a consumer would guess.

A borrower comparing two lenders' APRs is comparing figures that both exclude the appraisal and title costs — which for many files are among the largest line items. Two loans with identical APRs can have materially different cash requirements at closing.

What happened

The regulatory response over the following decades was not to abandon APR but to surround it.

The Know Before You Owe project produced the integrated disclosures now known as TRID (Chapter 22), which reorganized the Loan Estimate and Closing Disclosure around what consumer testing showed borrowers actually looked for: the monthly payment, the cash needed to close, and whether figures could change. The interest rate appears in large type at the top of the Loan Estimate. The APR appears on the last page.

That placement is a considered judgment. The regulator concluded, after testing, that the figures consumers use to make decisions are the payment and the cash to close — and put those first. The APR remains required, because it remains the only standardized cost comparison in the disclosure, but it is no longer presented as the headline.

Two further additions on the Closing Disclosure are worth knowing because they address the APR's weaknesses directly:

• Total Interest Percentage (TIP) — total interest paid over the loan's life as a percentage of the loan amount. On the Linden Street file, 130.512%. It says something APR does not: over thirty years this borrower pays more in interest than they borrowed.
• Total of Payments — the actual dollar sum. On this file, \$867,317.26.

What it shows

1. Standardization is necessary and does not produce understanding. Before TILA, comparison was impossible. After TILA, comparison is possible and is not performed correctly. Both statements are true, and the second does not argue for repealing the first.

2. A disclosure's failure mode is usually its name. "Annual percentage rate" is accurate and misleading. The word "rate" invites the borrower to compare it to the thing they were quoted, which is a different quantity. This generalizes: watch for disclosures whose names promise something adjacent to what they deliver.

3. Averaging over an assumed term hides the cost of exiting early. This is not an APR-specific flaw. It recurs in Chapter 4's break-even analysis (§4.7), where points look better the longer the horizon assumed, and borrowers reliably overestimate that horizon. Any figure that amortizes an upfront cost across an assumed holding period is optimistic by construction.

4. The remedy that works is a practitioner explaining it, in thirty seconds, before it becomes a surprise. No amount of disclosure design has solved this, and the loan officer is the only participant present who can.

The outcome for the practitioner

Three concrete practices.

Introduce the APR before the borrower discovers it. At application, not at closing: "You'll see two rates on the paperwork. One is your actual interest rate. The other is called APR, and it's higher because it folds in the closing costs and mortgage insurance — it's there so you can compare me against another lender on more than the headline number." Thirty seconds, and it converts a day-49 confrontation into a day-5 explanation.

Teach them to use it against you. "If somebody quotes you a better rate, ask for their APR. If their rate is lower and their APR is higher, their costs are higher than mine." Borrowers who shop will shop regardless. The ones you keep are the ones you equipped.

And be honest about its limit. If a borrower tells you they expect to move in five years, say plainly that the APR assumes thirty and therefore understates what the upfront costs will actually cost them — and then run the break-even from §4.7 instead. That is the calculation their situation actually calls for, and almost nobody does it for them.

Discussion questions

1. TILA's APR requirement fixed a real problem — incomparable cost quotations — and created a new one. On balance, is the disclosure a success? Defend your answer with reference to what existed before 1968.

2. The CFPB's consumer testing led it to put the interest rate in large type at the top of the Loan Estimate and the APR on the last page. Argue that this was the right decision. Then argue it was a capitulation.

3. Two lenders quote identical APRs. Name three ways the loans could still differ materially for the borrower.

4. The chapter says a disclosure's failure mode is often its name. Propose a better name for the APR — one that would not invite comparison to the note rate — and explain what your name gives up.

5. A borrower expects to move in four years. Describe exactly what you would compute for them instead of relying on APR, and what you would tell them the APR is good for.