There are certain well-defined principles which make clear when interest is accruing and when it is not. Money voluntarily left by any one in the hands of another will not, of course, draw interest unless a specific mutual agreement to that effect is made. In most cases, a demand note bears interest even though there be no statement to this effect on the face of the note.

Money on deposit in a bank without an agreement to pay interest will not accumulate interest even though it remain fifty years.