Compound Interest Rate Benchmarks by Account Type (2025)
2025 compound interest rate benchmarks by account and investment type
| Account/Investment Type | 2025 Rate Range | Risk Level | Best For |
|---|---|---|---|
| National Avg. Savings | 0.41% | None | Not a real savings vehicle |
| High-Yield Savings (HYSA) | 4.50%–5.10% | None (FDIC insured) | Emergency fund, short-term savings |
| Money Market Account | 4.50%–5.00% | Minimal | Liquid savings |
| 1-Year CD | 4.50%–5.25% | None (FDIC) | Known short-term needs |
| 5-Year CD | 3.75%–4.50% | None (rate risk) | Medium-term, fixed-rate lock |
| I-Bonds | 3.11% (current composite) | Minimal (inflation-linked) | Inflation hedge, 1-year lockup |
| Government Bonds (10-yr) | 4.25%–4.75% | Low-moderate | Conservative long-term |
| Balanced Portfolio (60/40) | 5%–7% avg. | Moderate | Pre-retirement, moderate growth |
| S&P 500 Index Fund | 7%–10% avg. (long-term) | High short-term | Long-term wealth building |
| Small-Cap Stocks | 9%–12% avg. (long-term) | High | Long-horizon, growth-focused |
The average national savings account rate is 0.41% — a rate that actually loses money in real terms with inflation at 2–3%. Yet an estimated $500 billion in savings sits in accounts earning under 1%. Switching to a top HYSA takes 10 minutes and immediately earns 10x more.
What 1% Rate Difference Actually Means Over Time
A 1% difference in annual return sounds trivial. Compounded over decades, it produces dramatically different outcomes. The chart below shows the impact of rate differences on a $10,000 initial investment with $300/month added over 30 years.
Long-term impact of 1% rate increments — $10,000 initial + $300/month
| Annual Rate | Balance After 10yr | Balance After 20yr | Balance After 30yr |
|---|---|---|---|
| 1% | $49,740 | $103,200 | $163,900 |
| 3% | $57,050 | $131,100 | $228,700 |
| 5% | $65,870 | $168,200 | $328,000 |
| 7% | $76,100 | $215,900 | $468,600 |
| 9% | $88,200 | $277,800 | $676,000 |
| 11% | $102,400 | $358,100 | $990,600 |
Why 7–8% Is the Planning Standard
Financial planners typically use 7% for long-term projections in diversified stock portfolios. This represents the S&P 500's historical ~10% nominal return minus 3% average inflation. It’s conservative enough to account for bad sequences of returns while realistic enough to be useful for planning. Very conservative planners use 6%; optimistic ones use 8%.
The Real Rate After Inflation and Taxes
Real compound interest rate after inflation and taxes by account type
| Nominal Rate | Less Inflation (3%) | Less Taxes (22%) | Real After-Tax Return |
|---|---|---|---|
| 5.0% HYSA | 2.0% | 3.9% taxable | 0.9% real |
| 7.0% S&P 500 | 4.0% | 5.95% (long-term cap gains) | 2.95% real (held 1yr+) |
| 7.0% in Roth IRA | 4.0% | 0% (tax-free growth) | 4.0% real |
| 7.0% in 401(k) | 4.0% | Deferred until withdrawal | 4.0% real now; taxed later |
Investing the same 7% return in a Roth IRA vs. a taxable brokerage account produces roughly 40% more wealth over 30 years — purely from tax-free compounding. The same dollar, the same rate, the same time. The account type is the only variable.
Compare Rates for Your Scenario
Enter your amount, contribution, and compare a 5% vs. 8% rate — see the 20-year gap that small difference creates.