Also, say you have an account that has 5% interest rate and you have say, $5,000 in it. Does that mean that by year end, you should have $5,250? Is that how it works?
It depends on how often the interest is calculated (compounded monthly, quarterly, semi-annually, annually, etc.). The more often it's calculated, the greater the interest income.
Example 1:
$5,000 deposit @ 5% interest compounded
annually:
Interest income = $250, total =
$5,250 after 1 year
Example 2:
$5,000 deposit @ 5% interest compounded
quarterly:
Quarter 1 interest income = $5,000 x .05/4 = $62.50, total after quarter 1 = $5062.50
Quarter 2 interest income = $5,062.50 x .05/4 = $63.28, total after quarter 2 = $5062.50 + $63.28 = $5,125.78
Quarter 3 interest income = $5,125.78 x .05/4 = $64.07, total after quarter 3 = $5,125.78 + 64.07 = $5,189.85
Quarter 4 interest income = $5,189.85 x .05/4 = $64.87, total after quarter 4 = $5,189.85 + $64.87 =
$5,254.72
By investing in an account where the interest compounds quarterly instead of annually, you just made yourself an extra $4.72 for nothing!
Anyway, obviously, the greater the principal, the greater the interest discrepancies.
Jason