APY and the Truth in Savings Act: Disclosures, Advertising, and Remedies

The Truth in Savings Act, together with its implementing Regulation DD, requires every bank and credit union to describe what a deposit account earns using one standardized number: the annual percentage yield, or APY. Because every institution has to calculate APY the same way, a 4.00% APY at one bank means the same thing as a 4.00% APY at another, and you can compare a savings account, a money market account, and a certificate of deposit without doing the math yourself. The law also controls which fees must be disclosed up front, how banks can advertise rates, and when you must be warned about changes to your account.

What APY Actually Measures

APY tells you the total interest a deposit account earns over one year, including the effect of compounding. Compounding is what happens when interest you have already earned starts generating its own interest. An account that compounds daily produces a slightly higher return than one that compounds monthly, even at the same stated interest rate. APY folds that difference into one figure, which is why federal law requires banks to use it rather than, or alongside, any quoted interest rate.¹

Regulation DD prescribes a uniform formula so no institution can inflate its reported yield. The formula takes the interest actually earned for a given period, divides it by the average daily balance, and annualizes the result over a 365-day year (or 366 in a leap year).²

Not every account has one flat rate. Tiered-rate accounts pay a higher rate as your balance crosses certain thresholds, and the bank has to disclose a separate APY for each tier. Stepped-rate accounts change the rate at preset intervals (3.50% for six months, then 4.25% for the next six, for example), and the bank must disclose each rate, how long it lasts, and a single composite APY that blends them together so the account can still be compared against a flat-rate alternative.²

One quick point of confusion worth clearing up: APY is the deposit-side number. Its counterpart on loans and credit cards is APR, which bundles the interest rate with certain loan fees to show the annual cost of borrowing. Higher APY is better when you are saving. Lower APR is better when you are borrowing.

What the Bank Must Disclose Before You Open an Account

A bank has to give you written account disclosures before you open the account or before it provides a service on the account, whichever comes first. You can also request them at any time, and the bank has to provide them in a form you can keep.² The disclosures have to cover:

The interest rate and the APY, including a separate APY for each tier or a composite APY for stepped-rate accounts.
How often interest compounds and when it gets credited to your balance.
The minimum deposit to open the account, the minimum balance to earn the stated APY, and the minimum balance to avoid fees.
How the bank calculates the balance on which it pays interest (for example, the daily balance method).
Every fee that can be charged against the account, and the amount or how it is calculated.³
For CDs and other time accounts, the penalty for withdrawing money before the maturity date.

A monthly maintenance charge or a wire fee can quietly cancel out the yield you were shopping for. Regulation DD is designed to put those costs in front of you before you commit rather than leaving them in a terms-of-service document you only read later.

Account-opening bonuses have their own rule. Any bonus worth more than $10 triggers extra disclosures: the amount or type of the bonus, the balance and time you need to qualify, and when you will actually receive it. Items worth $10 or less, waived fees, and interest payments do not count as bonuses for this purpose.²

Statements and Changes After You Open the Account

If the bank sends periodic statements, each one has to show the APY earned during that statement period, the dollar amount of interest credited, and an itemized list of fees charged, broken out by type and dollar amount.⁴ If the bank offers overdraft services, it must also separately disclose the total overdraft fees and the total returned-item fees, both for the statement period and year to date.⁵

When a bank wants to change an account term in a way that reduces your APY or otherwise hurts you, it has to mail or deliver a notice at least 30 calendar days before the change takes effect, and the notice has to state the effective date.⁶ There are limited exceptions: routine rate changes on variable-rate accounts, changes to check-printing fees, and term changes on very short-term time accounts of one month or less. For everything else, you get a 30-day window to decide whether to stay or move your money.

How the Advertising Rules Protect You

If a deposit ad mentions a rate of return, that rate has to be expressed as an annual percentage yield. The bank can also show the underlying interest rate, but it cannot display the interest rate more prominently than the APY.⁷ That rule shuts down the old trick of splashing a high nominal rate in large type while the lower effective yield hides in a footnote.

Once an ad states an APY, several other details have to appear with it:

For variable rates, a statement that the rate may change after the account is opened.
How long the APY is offered, or a statement that it is accurate as of a specific date.
The minimum balance needed to earn that APY.
The minimum opening deposit, if it is higher than the balance needed to earn the yield.
A statement that fees could reduce earnings on the account.
For CDs, the length of the term and a statement that early withdrawal penalties may apply.⁷

Tiered-rate ads have to show the APY and minimum balance for each tier with equal prominence. Stepped-rate ads have to list every rate and how long each one lasts. Bonus ads have to state the APY, the time and balance requirements, the minimum opening deposit if higher, and when the bonus will be paid, so a bare “$300 bonus!” headline without those details does not comply.⁷

The “free account” rule is the strongest piece of consumer protection in this section. A bank cannot call an account “free” or “no cost” if any maintenance or activity fee can be charged to it.⁷ The statute goes further and says an account also cannot be described as free if you have to maintain a minimum balance to avoid fees or if the number of transactions is capped.¹ Any monthly service charge, any required balance, or any transaction limit disqualifies the “free” label.

Which Accounts the Law Covers

TISA and Regulation DD apply to deposit accounts held by individuals for personal, family, or household purposes. The regulation defines a covered consumer as a natural person who holds or is offered such an account.⁸ Business accounts, commercial accounts, and accounts held in a professional capacity for someone else fall outside the law. A savings account you open for your small business does not come with these standardized disclosures.

Credit unions are covered through a parallel rule. Regulation DD governs banks and thrifts; the National Credit Union Administration enforces its own version in Part 707, which Congress required to be “substantially similar.”⁹ In practice, credit union members get essentially the same disclosures and advertising protections as bank depositors.

What You Can Do If a Bank Violates the Rules

You cannot sue your bank under TISA. Congress repealed the private right of action in 1996, effective in 2001, so a lawsuit for missing disclosures or a misleading ad is no longer an option.¹⁰ Enforcement runs entirely through federal agencies under 12 U.S.C. § 4309.¹¹ The CFPB holds rulemaking authority over Regulation DD and can enforce it against covered institutions, particularly larger banks and thrifts.¹² The OCC, FDIC, and Federal Reserve enforce TISA against the institutions they supervise, with cease-and-desist orders and civil money penalties available under the Federal Deposit Insurance Act. NCUA handles the parallel Part 707 rules for credit unions.

Your practical remedy is the complaint route. Filing a complaint with the CFPB, which maintains a public complaint database and investigates patterns of non-compliance, is the most effective step. Keeping copies of the disclosures you received, your periodic statements, and any promotional material that influenced your choice gives you the documentation to back up the complaint.

Taxes on the Interest You Earn

Interest from a deposit account is taxable. Any bank or credit union that pays you $10 or more in interest during the year has to send you a Form 1099-INT and report the amount to the IRS.¹³ If you earn less than $10, the income is still taxable; the bank just is not required to send the form. With high-yield savings APYs in the range of 3.75% to 4.20%, the tax on a sizeable balance can be large enough to factor into which account actually comes out ahead.

1
Office of the Law Revision Counsel. 12 USC 4302 – Disclosure of Interest Rates and Terms of Accounts
2
eCFR. 12 CFR Part 1030 – Truth in Savings (Regulation DD)
3
Office of the Law Revision Counsel. 12 USC 4303 – Account Schedule
4
eCFR. 12 CFR 1030.6 – Periodic Statement Disclosures
5
eCFR. 12 CFR 1030.11 – Additional Disclosure Requirements for Overdraft Services
6
Consumer Financial Protection Bureau. Regulation DD 1030.5 – Subsequent Disclosures
7
eCFR. 12 CFR 1030.8 – Advertising
8
eCFR. 12 CFR 1030.2 – Definitions
9
National Credit Union Administration. Truth in Savings Act (NCUA Rules and Regulations Part 707)
10
Office of the Law Revision Counsel. 12 USC 4310 – Repealed
11
Office of the Law Revision Counsel. 12 USC 4309 – Administrative Enforcement
12
Consumer Financial Protection Bureau. CFPB Consumer Laws and Regulations TISA
13
Internal Revenue Service. About Form 1099-INT, Interest Income