The statute and Regulation Z are one thing, and almost everything a consumer meets is the regulation. The Act sets the framework; the operative detail sits in Regulation Z, 12 CFR part 1026. That is where the definition of a finance charge is worked out, where the closed-end and open-end disclosure tables come from, where the credit card billing-error procedure lives at 1026.13, where the mortgage forms are prescribed, and where the three-day right to cancel certain home-secured loans sits at 1026.23. Rule-writing authority moved from the Federal Reserve Board to the Consumer Financial Protection Bureau in the Dodd-Frank Act, and Truth in Lending is an enumerated consumer law at 12 USC 5481(12)(O), which is what makes Regulation Z the Bureau's. The Federal Reserve's fingerprints survive in the statutory text: 15 USC 1640(f) still protects a creditor's good-faith reliance on "any rule, regulation, or interpretation thereof by the Bureau or the Federal Reserve System".
The Act's two organizing distinctions. Everything downstream turns on whether credit is open-end or closed-end, and on whether it is secured by real property or a dwelling. Those two axes are what produce four different damage bands, four different disclosure regimes, and the reason a rule that is true of a credit card is often false of a mortgage. The consumer-facing consequence people meet most often is that the annual percentage rate means something different on each side of the closed-end line, because what the regulation requires to be folded into it differs.
Section 1640 is the remedy, and it is entirely unaddressed elsewhere on this site. A creditor that fails to comply is liable under 15 USC 1640(a) for actual damages, plus a statutory amount that depends on the kind of credit:
The residual rule at 1640(a)(2)(A)(i) is simply twice the amount of any finance charge in connection with the transaction, with no floor and no ceiling. That is what applies to an individual action on credit that falls outside the three specific categories below, an unsecured closed-end personal loan or a car loan among them, and it is why a small finance charge on such a loan can yield a small statutory award. On an open-end plan not secured by real property or a dwelling, which is the ordinary credit card case, 1640(a)(2)(A)(iii) gives twice the finance charge in connection with the transaction, "with a minimum of $500 and a maximum of $5,000, or such higher amount as may be appropriate in the case of an established pattern or practice of such failures". On a closed-end transaction secured by real property or a dwelling, 1640(a)(2)(A)(iv) gives "not less than $400 or greater than $4,000". On a consumer lease, 1640(a)(2)(A)(ii) gives 25 percent of the total monthly payments, floored at $200 and capped at $2,000. And in a class action, 1640(a)(2)(B) applies no minimum per class member and caps the total recovery for the same failure by the same creditor at "the lesser of $1,000,000 or 1 per centum of the net worth of the creditor". Costs and a reasonable attorney's fee follow a successful action under 1640(a)(3). None of these figures is indexed; they are statutory literals.
Statutory damages do not attach to every disclosure error, and this is the qualifier most summaries drop. The paragraphs following 1640(a) restrict the statutory amount to a listed subset of requirements. For open-end credit, a creditor has liability under paragraph (2) only for failing to comply with section 1635, section 1637(a), or paragraphs (4) through (13) of section 1637(b). For closed-end credit, only for section 1635 or for specified items of section 1638(a): the amount financed, the finance charge, the annual percentage rate, the total of payments and the payment schedule, among others. The practical effect is reassuring rather than restrictive for most borrowers, because the items a person actually shops on are inside the list. But a disclosure defect outside it leaves only actual damages, which on a paperwork error are frequently nothing.
Three further limits on that remedy that decide most real cases. First, 1640(b) lets a creditor escape liability entirely by self-correcting within sixty days of discovering an error, provided it acts before suit is brought and before it receives written notice of the error from the borrower. That is a strong incentive to notify in writing rather than by telephone, because a written notice closes the escape hatch. Second, 1640(c) gives a bona fide error defense for an unintentional violation despite reasonable procedures, listing clerical, calculation, computer and printing errors as examples, "except that an error of legal judgment with respect to a person's obligations under this subchapter is not a bona fide error." Getting the law wrong is not a defense; getting the arithmetic wrong may be. Third, 1640(f) shields good-faith reliance on a Bureau rule or interpretation even if the rule is later invalidated.
The deadline is one year, and the exception to it is worth more than the rule. Section 1640(e) gives one year from the occurrence of the violation for most claims, and three years for violations of the high-cost and mortgage-underwriting provisions at sections 1639, 1639b and 1639c, with state attorneys general also getting three years on those. Then the sentence that matters to a borrower who discovers the problem late: the subsection "does not bar a person from asserting a violation of this subchapter in an action to collect the debt which was brought more than one year from the date of the occurrence of the violation as a matter of defense by recoupment or set-off in such action, except as otherwise provided by State law." So a borrower being sued on the debt years later may still raise the disclosure failure defensively to reduce what is owed, subject to state law on recoupment. Losing the right to sue is not the same as losing the point.
What sits next to the Act rather than inside it. The three-day right to cancel certain home-secured credit is a Truth in Lending right, at 15 USC 1635 and 12 CFR 1026.23, and it runs the opposite way from most people's intuition, which is treated in depth on the pages about home equity borrowing and refinancing. The $50 ceiling on liability for unauthorized credit card use is 15 USC 1643, and the billing-error procedure is 12 CFR 1026.13; both belong to the credit card material. Consumer leases come in through part E of the same subchapter. And the separate right to raise a seller's breach against the card issuer is 15 USC 1666i, which behaves quite differently from a billing error.