A basis point is one one-hundredth of a percentage point. One basis point equals 0.01%, 25 basis points equal 0.25%, and 100 basis points equal 1.00%. Financial institutions use basis points because they make small changes in interest rates easier to describe without ambiguity.
A move from 4.00% to 4.25% is an increase of 25 basis points—not a 25% increase and not 25 percentage points. That distinction matters when you compare savings yields, CD rates, mortgage offers, bond yields, and Federal Reserve policy changes.
Basis Points at a Glance
| Basis points | Percentage-point change | Example |
|---|---|---|
| 1 bps | 0.01% | 4.00% to 4.01% |
| 10 bps | 0.10% | 4.00% to 4.10% |
| 25 bps | 0.25% | 4.00% to 4.25% |
| 50 bps | 0.50% | 4.00% to 4.50% |
| 100 bps | 1.00% | 4.00% to 5.00% |
The conversion is simple:
Basis points ÷ 100 = percentage points
Percentage points × 100 = basis points
Why Financial News Uses Basis Points
Saying that a rate rose “0.25%” can be confusing. Some readers interpret that as a relative increase of one quarter of one percent, while others hear a 0.25-percentage-point change. Saying “25 basis points” clearly identifies the second meaning.
- Central-bank policy: rate decisions are often discussed in 25-basis-point increments.
- Savings and CDs: a bank may offer an APY that is 20 or 50 basis points above another offer.
- Loans: small mortgage or auto-loan differences can change monthly payments and total interest.
- Bonds: a yield change of only a few basis points can affect market prices, especially for longer-term bonds.
- Fees: an annual fund cost of 0.25% may also be described as 25 basis points.
Example 1: 25 Basis Points on $10,000 in Savings
Suppose one savings account pays 4.25% APY and another pays 4.50% APY. The difference is 25 basis points. If each APY remains in effect for a full year and you keep a constant $10,000 balance, the simplified difference is:
$10,000 × 0.0025 = $25
The higher APY would produce about $25 more over one year before taxes, fees, or balance changes. On $50,000, the same 25-basis-point difference is about $125. On $100,000, it is about $250.
| Balance | Approximate annual difference from 25 bps |
|---|---|
| $10,000 | $25 |
| $25,000 | $62.50 |
| $50,000 | $125 |
| $100,000 | $250 |
Use the AssetCalculus Compound Interest Calculator to compare how small rate differences can grow over multiple years. Remember that savings rates are often variable, so a current APY may not last for the entire period.
Example 2: 25 Basis Points on a Mortgage
On a large loan, a 25-basis-point difference can matter even when it looks small. Consider a hypothetical $300,000 fixed-rate mortgage with a 30-year term:
| Interest rate | Approximate monthly principal and interest |
|---|---|
| 6.50% | $1,896 |
| 6.75% | $1,946 |
The 25-basis-point increase adds roughly $50 per month, or about $600 during the first year. Over 30 years, the total difference can become much larger. Actual loan comparisons must also include APR, points, closing costs, mortgage insurance, taxes, and the time you expect to keep the loan.
Basis Points vs. Percent Change
Basis points describe an absolute change in a percentage. Percent change describes the change relative to the starting value.
If a yield rises from 4.00% to 5.00%, it rose by 100 basis points, or 1 percentage point. Relative to the original 4.00% rate, however, the rate increased by 25% because 1.00 ÷ 4.00 = 0.25. Both statements can be mathematically correct, but they answer different questions.
How Basis-Point Changes Affect Bonds
Bond prices and yields generally move in opposite directions. When market yields rise, older bonds with lower coupon rates may become less attractive, causing their market prices to fall. When yields decline, existing higher-rate bonds may become more valuable.
The size of the price move depends on maturity, coupon rate, duration, credit quality, and other factors. A 25-basis-point move is therefore not worth the same number of dollars for every bond.
When 25 Basis Points Matters Most
- When the balance is large
- When the loan or investment lasts many years
- When interest compounds frequently
- When fees are also expressed as a percentage of assets
- When comparing otherwise similar products
A rate difference should not be evaluated alone. A higher-yield account may have minimum-balance rules or restricted access. A lower mortgage rate may require paying points upfront. Compare the complete product, not just the basis-point difference.
Frequently Asked Questions
How much is 50 basis points?
Fifty basis points equal 0.50 percentage points. A rate moving from 3.75% to 4.25% increased by 50 basis points.
Is 100 basis points the same as 1%?
It equals one percentage point. Moving from 4% to 5% is a 100-basis-point increase. The relative percent increase is 25%, so context matters.
How do I calculate the dollar effect?
For a simple one-year estimate, multiply the balance by the basis-point change expressed as a decimal. For 25 basis points, multiply by 0.0025. Loans and multi-year investments require payment or compounding calculations.
Bottom Line
A basis point is a precise way to describe small percentage-point changes. Twenty-five basis points equal 0.25 percentage points. The dollar effect may be modest on a small balance for one year but meaningful on a large loan, a large deposit, or a long time horizon.
This article is for general educational and informational purposes only. It does not constitute individualized financial, investment, tax, or legal advice.