Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

Do banks give us interest even for the money that we only had briefly in our account?
As mentioned in other answers the interest you make is negligible and the calculations would depend on the bank. In saying that the general trend is calculate daily, pay monthly.  A typical scenario would be that every night at midnight the interest for your account at that point in time is calculated. This occurs every midnight and at the end of the month the sum of those calculations will be added to your account. You could have had several significant transactions pass through your account in one day although if the interest is calculated at a specific point in time some transactions may not contribute to any interest. These calculations are worth thinking about,  even in circumstances of negligible returns, as it could assist when considering combining credit cards with home loan offset accounts so it is not a complete waste of time to understand how interest is calculated. The more you know ;)