Back Get Started. Related Terms Automatic Investment Plan AIP Definition An automatic investment plan is an investment program that allows investors to contribute funds to an investment account in regular intervals. This will be determined as conservative, moderate or aggressive. You can also buy and sell with Bitcoin. Nerdwallet recommends Betterment for investors who want to be hands-off, are retired, want automatic rebalancing, have low balances or like goal-based tools. You can also see the average share price investors bought stocks at and their current prices. To that end, some micro-investing platforms aim to help users to not only get in the habit of saving and investing but also to learn about investing.