How Much Should You Invest Per Month? A Practical Guide

One of the most common questions new investors ask is: how much should I invest each month? The honest answer is that any amount is better than nothing — but let's get more specific than that.

The 50/30/20 starting point

A widely-used budgeting framework allocates 50% of after-tax income to needs, 30% to wants, and 20% to savings and investments. If your take-home pay is $5,000/month, that suggests $1,000/month toward savings and investing. Even if you split that between an emergency fund and investments, you're looking at $400-600/month in recurring investments.

What different amounts grow into

Assuming a 10% average annual return (the long-term S&P 500 average before inflation), here's what consistent DCA can build over time:

• $100/month for 20 years → ~$76,000
• $250/month for 20 years → ~$190,000
• $500/month for 20 years → ~$380,000
• $1,000/month for 20 years → ~$760,000
• $100/month for 30 years → ~$226,000
• $500/month for 30 years → ~$1,130,000

The numbers above illustrate two powerful forces: consistency and compound growth. Even modest amounts become substantial wealth over long time horizons.

Before you start investing

1. Build a small emergency fund first (1-3 months of expenses)
2. Pay off any high-interest debt (credit cards, personal loans)
3. Contribute enough to your 401(k) to capture any employer match
4. Then direct remaining investment dollars to a brokerage account with automated DCA

Start now, optimize later

Don't let the perfect amount be the enemy of getting started. Starting with $50/week today is dramatically better than waiting six months to start with $200/week. The earlier you begin, the more time your money has to compound — and that extra time is worth far more than a slightly larger contribution.

Use our DCA calculator to see exactly what your chosen amount could grow into over your target time horizon. Then set it up, automate it, and move on with your life.