Daily vs monthly compounding: what is the difference worth?
Switch the compounding frequency below and watch the ending balance move. The honest answer is that frequency matters far less than the rate, the amount, or the time - but it is not nothing, and on a savings account it is free.
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The size of the effect
At 5% over fifteen years, moving from yearly to daily compounding improves the result by a low single-digit percentage. At 12% the gap widens, because there is more interest to compound.
The insight panel above quantifies it on your exact figures: it compares your chosen frequency against annual compounding and gives the difference in cash.
Where it actually matters
It matters most on interest-bearing cash accounts, where the advertised rate and the effective annual yield can differ. Compare accounts on the effective yield, not the nominal rate.
It matters least on equity investments, where returns arrive as price movements and dividends rather than as posted interest, and where the variability of returns dwarfs the compounding convention.
Frequently asked questions
Is daily compounding better than monthly?
Slightly, at the same nominal rate. The difference is usually worth less than a small improvement in the rate itself.
What is APY?
The effective annual yield after compounding is applied. It is the figure to compare across savings accounts, because it already includes the frequency.
Does my savings account compound daily?
Many do while paying monthly. The provider's summary box will state both the nominal rate and the effective yield.
Should I choose an account on compounding frequency alone?
No. Compare the effective yield, then the fees, access rules and protection scheme coverage.
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