Investing monthly (weekly, daily, other), as funds become available isn't dollar cost averaging, it's lump sum investing. It would be dollar cost averaging if your monthly investment budget became available on the 1st of the month but instead of depositing it then, you buy 1/30 each day. DCA is less than ideal for investing, but the math works when used for other purposes such as buying gas. Buying $10 of gas on a schedule, rather than filling the tank when it's low, will leave you money ahead over time.