Automatic Investing Explained: How Set and Forget Investing Works

Many people want to invest but never get around to it. Life gets busy, the right moment never comes, and the money stays in a bank account. Automatic investing fixes the first problem. It takes the decision out of each month and turns investing into a habit that runs by itself. This guide explains how it works, what dollar cost averaging means, and what to watch out for.

The short answer

Automatic investing means a fixed amount of money moves on a schedule from your bank account into an investment account, without you having to remember each time. You choose the amount and the date, and the transfer repeats. It builds a habit, but it does not remove risk, because investments can still rise and fall in value.

What is automatic investing?

Automatic investing means a fixed amount of money moves on a schedule into an investment account, without you having to remember each time. You choose the amount and the date, and the transfer repeats, for example every month on payday. The money often goes into a fund, which is a basket of many investments bought together. A common setup is a monthly transfer from a bank account to a brokerage account, with an automatic purchase each time the money arrives. Another common setup is a workplace retirement plan, where part of each paycheck goes into the plan before you see it. In both cases, you set it up once and it keeps going. You can change the amount or stop the transfers at any time, but the point is that you do not have to decide again each month.

How dollar cost averaging works

Dollar cost averaging is the name for what happens when you invest the same amount of money at regular times, no matter what the price is doing. When the price is low, your fixed amount buys more units. When the price is high, the same amount buys fewer units. Over time, you pay a mix of high and low prices instead of putting all your money in on one day at one price. It does not need you to guess when prices will rise or fall, because you invest on the same schedule either way. It is a simple idea, and it is the main reason automatic investing appeals to beginners.

Worked example: dollar cost averaging with checked math

Example only. The prices below are made up to show how the math works. They are not a promise of any return.

Suppose you invest $100 each month for three months. In month 1, the price is $20 per unit, so $100 buys 5 units. In month 2, the price falls to $10 per unit, so $100 buys 10 units. In month 3, the price rises to $25 per unit, so $100 buys 4 units. In total, you spent $300 and bought 19 units. Your average cost is $300 divided by 19, which is $15.79 per unit. Compare that with putting all $300 in during month 1, when the price was $20. That would have bought only 15 units. The average of the three prices was $20 plus $10 plus $25, divided by 3, which is $18.33. Your average cost of $15.79 was lower than that, because you bought more units when the price was low. The example shows how the math works, not what will happen next. Prices do not always fall and rise in this pattern.

Why people like it: habit and less emotion

The main benefit is the habit. Investor.gov describes regular investing as putting a set dollar amount or a set percentage of income in on a regular basis, and it gives a simple formula: with long-term investing, regular investments plus time lead to wealth. A schedule takes the monthly decision off your plate, so you do not have to find the willpower to invest each time. It also takes some of the emotion out of it. When prices fall, many people feel afraid and stop investing, and when prices rise, many people feel excited and buy more. A fixed schedule does the same thing in both cases, which can keep a plan steady. That steadiness is the real value. It does not make investing safe, but it does make it regular.

The honest risks: it does not remove risk

Automatic does not mean safe. Investor.gov states it plainly: all investments involve risk and you should allow for market fluctuations over time. The value of your investments can fall, and it can stay down for a long time. If prices fall month after month, your automatic purchases keep buying while the value drops, and that can feel hard to watch. Dollar cost averaging does not protect you from a long fall, and it does not promise a profit. Investor.gov also notes that investing does not have a set rate of return. A plan that runs by itself still needs a check now and then, so you can see whether the amount still fits your budget and your goals.

Watch the fees

Fees are the quiet cost to watch. An investment account can charge a monthly fee, and a fund can charge a yearly fee taken from the money in the fund. A small fee may look tiny on its own, but the same fee taken every year, for many years, adds up. Before you set up an automatic plan, check what the account charges and what the fund charges, and compare them with other options in plain terms. Investor.gov also warns against putting all your money in one place, with the old saying: do not put all your eggs in one basket. Spreading money across different kinds of investments, such as stocks and bonds, and across many companies inside each kind, is called diversification, and it is one way to avoid betting everything on a single outcome.

How to set it up in simple steps

These are the basic steps, in general terms. This guide does not recommend any product or platform.

• Check your budget and pick a monthly amount you can keep up, even in a tight month.
• Use an investment account you already have, or open one.
• Decide in general what the money will buy, such as a broad fund.
• Set the amount and the date, for example the day after payday.
• Check the plan once in a while, not every day, and change the amount if your budget changes.

If any step is unclear, read the Investor.gov page linked below before you start.

A quick checklist

• The monthly amount fits your budget.
• You know what the money buys each time.
• You know what fees the account and the fund charge.
• You know that the value can fall as well as rise.
• You have a date to check the plan again.

Quick answers

Related guides

• Investing for Beginners: A Simple Guide to Your First Investment
• The Rule of 72: How to Estimate How Fast Your Money Doubles
• How Much Money Do I Need to Start Investing?

Further reading

• Investor.gov, Introduction to Investing: https://www.investor.gov/introduction-investing, from the US Securities and Exchange Commission, with the ideas on regular investing, risk, and diversification used in this guide.

This content is educational only. It is not financial advice. Investing involves risk, including the possible loss of money. Check the Investor.gov page linked above before you invest.