If Short-Term Rates Were 15%, How Much Would $1,000 Earn in Savings, CDs, Municipal Bonds, and Treasuries?

A 15% benchmark interest rate sounds simple: invest $1,000, earn $150 in a year. In real US financial products, it is not that automatic.

The closest US version of this question is not a direct translation of Brazil’s Selic-linked products. For a US reader, the comparable choices are high-yield savings accounts, certificates of deposit, tax-exempt municipal bonds, and Treasury bills or other Treasury securities bought through TreasuryDirect or a brokerage.

The fast answer: if a product truly pays 15% APY for one year, $1,000 grows to about $1,150 before taxes. But many products pay less than the policy rate, lock up money, have tax differences, or carry market risk.

This article is educational, not personalized investment, legal, or tax advice. For decisions involving taxes, liquidity, or portfolio allocation, consider speaking with a CPA or fiduciary financial advisor.

Quick Comparison: What $1,000 Could Earn

These are simplified one-year examples before federal income tax unless noted. They assume rates available as of a hypothetical 15% short-term rate environment, not guaranteed current offers. As of June 2026, verify current terms before deciding.

Option	US equivalent	Example annual yield	$1,000 after 1 year	Main trade-off
Traditional savings	Bank savings account	0.50%	$1,005	Very liquid, often low yield
High-yield savings	Online savings account	13.00%	$1,130	Variable rate can fall
CD	FDIC-insured certificate of deposit	15.00%	$1,150	Early withdrawal penalty
Municipal bond	Tax-exempt bond exposure	11.00% tax-exempt	$1,110	Credit and market risk
Treasury bill	US Treasury bill	15.00% annualized	$1,150	Rate fixed only for bill term

According to the Federal Reserve, H.15 publishes selected interest rates, including Treasury and money market rates, on business days (Federal Reserve, 2026). That is a useful benchmark, but banks and bond markets still set their own yields.

1. Savings Accounts: Liquid, But Not Automatically Competitive

A standard savings account is the simplest place to hold cash, but it may be the least responsive to a high-rate environment. Banks are not required to pass the full policy-rate increase to depositors. A large brick-and-mortar bank could still pay a very low annual percentage yield while earning more on loans and securities.

If $1,000 earns 0.50% for one year, the result is:

$1,000 x 0.005 = $5 in interest

Ending balance: $1,005

A high-yield savings account can behave differently. Online banks and credit unions often compete more aggressively for deposits. If a high-yield savings account paid 13% APY in a 15% short-rate environment, $1,000 would earn about $130 in one year.

Ending balance: $1,130

The main advantage is liquidity. You can usually move money quickly, which makes high-yield savings accounts useful for emergency funds, near-term bills, and cash you cannot afford to lock up. The main weakness is that the rate is variable. If market rates fall, the bank can reduce the APY.

Deposit protection matters. The FDIC explains that deposit insurance protects eligible deposits at insured banks, subject to coverage limits and account ownership rules (FDIC, 2026). Credit unions may have separate federal insurance through the NCUA.

2. CDs: Higher Certainty, Less Flexibility

A certificate of deposit is a time deposit. You agree to leave money at a bank or credit union for a set term, such as 3 months, 6 months, 1 year, or 5 years. In exchange, the institution usually offers a stated rate.

Investor.gov describes CDs as products that typically pay interest for a fixed period and may charge penalties for early withdrawals (Investor.gov, 2026).

If a 1-year CD pays 15% APY and you deposit $1,000:

$1,000 x 0.15 = $150 in interest

Ending balance: $1,150

The appeal is predictability. If the CD is properly insured and held to maturity, you know the stated return. That can be useful when you have a defined date for the money, such as a tax payment, tuition bill, or home down payment.

The drawback is access. If you break the CD early, the penalty could reduce your interest or, in some cases, touch principal depending on the product terms. Also, when rates are extremely high, long CDs create reinvestment questions. Locking a high rate can be attractive, but locking too long can be risky if inflation is also high or if you need cash sooner.

3. Municipal Bonds: Tax Benefits Are The Point

Brazilian LCI and LCA products do not have a perfect US match. The closest US concept is tax-advantaged fixed income, especially municipal bonds. Municipal bonds are issued by states, cities, counties, and public authorities. Interest is often exempt from federal income tax and may be exempt from state income tax if issued in your state.

That tax treatment means the nominal yield can be lower while the after-tax yield remains competitive.

Example: suppose a municipal bond or municipal bond fund yields 11% tax-exempt, while a taxable CD yields 15%. If an investor is in a 24% federal marginal tax bracket, the taxable-equivalent yield is roughly:

11% / (1 - 0.24) = 14.47%

For that investor, an 11% tax-exempt yield could be close to a 15% taxable yield after federal tax. For someone in a lower bracket, it may be less compelling.

On $1,000, an 11% tax-exempt yield produces about $110 before considering any state tax impact.

Ending balance before price changes: $1,110

The caution is risk. Individual municipal bonds can have credit risk. Municipal bond funds can lose value when market rates rise, because bond prices and yields generally move in opposite directions. Tax benefits also depend on your personal situation, so do not assume a municipal bond is better simply because the word “tax-exempt” appears in the description.

4. Treasury Bills: Direct Link To Short-Term Government Rates

Treasury bills are one of the cleanest US equivalents for a benchmark-rate comparison. They are short-term US government securities, commonly issued with maturities from 4 weeks to 52 weeks. TreasuryDirect states that Treasury bills are sold at a discount or at par, and the investor receives face value at maturity (TreasuryDirect, 2026).

If a 1-year Treasury bill effectively yields 15%, a $1,000 investment would earn about $150 over one year.

Ending balance: $1,150

Treasury interest is subject to federal income tax, but generally exempt from state and local income taxes. That can make Treasury bills especially attractive for investors in high-tax states.

The main risk for someone holding a Treasury bill to maturity is not default risk in the ordinary sense. It is reinvestment risk and opportunity cost. A 4-week bill has to be rolled over often. If rates fall, your next bill may pay less. If you sell before maturity through a broker, the market price can move.

5. Which Option Looks Best?

For emergency money, the high-yield savings account usually has the strongest practical case. It may not pay the absolute highest rate, but liquidity matters. An emergency fund should be available when the emergency happens.

For money with a known date, a CD or Treasury bill can be cleaner. A 6-month bill, 1-year bill, or matching CD can align the maturity with the planned expense. Compare APY, penalties, insurance, taxes, and minimums.

For taxable investors in higher brackets, municipal bonds deserve a look, but only after comparing taxable-equivalent yield and risk. A tax-exempt yield is not automatically better than a taxable yield.

For investors who want simplicity and federal backing, Treasury bills are often the easiest benchmark-rate instrument to understand. The minimum purchase through TreasuryDirect is generally accessible, and bills have clear maturity dates.

Common Mistakes To Avoid

Do not assume the Federal Reserve’s policy rate is the rate your bank will pay. Bank APYs are business decisions.

Do not compare taxable and tax-exempt yields without adjusting for taxes. A lower municipal yield may be competitive after tax, but only for some taxpayers.

Do not put emergency money into a CD without understanding the penalty. The highest APY can be the wrong choice if you need the cash early.

Do not ignore inflation. A 15% nominal return sounds high, but purchasing power depends on what prices are doing at the same time.

Do not chase yield without checking insurance or credit quality. FDIC insurance, Treasury backing, and municipal credit risk are different protections.

Frequently Asked Questions

Would $1,000 always become $1,150 at a 15% rate?

Only if the product actually pays 15% for a full year and you meet all terms. A 15% policy-rate environment does not force every savings account, CD, bond, or fund to pay 15%.

Are CDs safer than Treasury bills?

They are different. An FDIC-insured CD at an insured bank can be protected within FDIC limits. Treasury bills are obligations of the US Treasury. CDs have bank-specific terms and early withdrawal rules, while Treasury bills have market pricing if sold before maturity.

Are municipal bonds the same as LCI or LCA?

No. LCI and LCA are Brazilian products. For US readers, municipal bonds are the closest practical comparison because their main appeal is tax-advantaged income. They still carry different rules, risks, issuers, and tax treatment.

Should I choose the highest yield?

Not automatically. Match the product to the job. Liquidity, taxes, maturity date, penalties, insurance, and risk can matter more than the headline yield.

Bottom Line

If a safe one-year product truly paid 15%, $1,000 would earn about $150 before taxes. In practice, a high-yield savings account may pay less but keep cash flexible, a CD may lock in a rate but charge penalties, municipal bonds may help after taxes but add credit and market risk, and Treasury bills may offer a direct way to capture short-term government yields.

Start with the money’s purpose. Emergency cash belongs in liquid, insured accounts. Known future expenses can fit CDs or Treasury bills. Tax-sensitive fixed income requires a careful after-tax comparison. Then compare current APYs and yields as of the month you invest, because rate offers can change quickly.