<prompt> Human: Though three months is not a lot of time for any investment to mature, where is the best place to store money to be used to pay estimated quarterly taxes? Obviously this money needs to remain easily liquified. It would have roughly 2500 contributed to it per month.Its very demotivating just tossing this money into a savings account earning a half a percent... Might as well just sit on hundred dollar bills at that point.  <response>: Just keep it in an online savings account. Anything else is far too risky for a quarterly time frame 