Read compounding in the right place
| Situation | What to do next |
|---|---|
| Same APY | Compounding frequency alone should not change annualized yield. |
| Same interest rate | APY can reveal a compounding difference. |
| Balance changes often | Model actual deposit timing and fees. |
Separate rate from APY
The interest rate is applied under the account's method; APY standardizes the annual compounding result under its assumptions.
APY already expresses the annual effect of the stated compounding assumptions. When two accounts show APY, do not add another compounding adjustment or assume daily compounding automatically produces the better result. Compare the same period and deposit pattern in both accounts. Verify whether added deposits begin earning immediately.
Avoid double counting
When comparing advertised APYs, do not add a separate daily-compounding advantage. The compounding effect is already represented.
Check how often interest credits because credit timing can affect statements and withdrawals. Then compare projected dollars using APY, the same starting balance and the same holding period.
Build a reliable cost comparison
Use expected balances
Deposits and withdrawals change the dollars earned. Project the actual balance pattern and subtract unavoidable fees.
Rate, fees and balance requirements usually overwhelm a tiny difference in compounding schedule. Use frequency as a contract detail, not a shortcut that replaces the full account comparison.
Keep these three outcomes separate
APY incorporates the stated compounding effect over a year.
Daily compounding does not guarantee a higher APY than monthly compounding.
Fees and balance rules can outweigh a small compounding difference.
Primary sources
- FDIC: Deposit account basicsOfficial reference ↗
- CFPB Regulation DD: deposit disclosuresOfficial reference ↗
Answers to check before you act
Is daily compounding always better?
Not if another account offers a higher APY or lower fees. Compare APY and net earnings.
Does interest crediting equal compounding frequency?
Not necessarily. Read how interest accrues, compounds and is credited in the disclosure.