How Much Should I Invest Monthly? The Formula I Wish I’d Known Sooner

Stop Asking the Wrong Question
For years I kept asking myself one thing:
“Am I putting away enough—or am I doomed to work until I’m 70?”
I wasted hours Googling, reading books, listening to people throw around random numbers. “10%.” “20%.” “As much as you can.” None of it gave me a straight answer.
Here’s the truth: “How much should I invest?” is the wrong damn question.
The right one is: “Do I have a system that works automatically?”
The Wake-Up Call
Here’s what changed everything for me: the amount doesn’t matter nearly as much as having a bulletproof system.
One month I saved $800. Felt good. The next month? I blew it all. Why? No plan. Without a system, progress vanishes overnight.
Once I built the right structure, I stopped stressing over the “perfect number” and started building wealth on autopilot.
Step One: Build Your Safety Net
Before you invest a dime, get your safety net in place. Because if your car breaks down or you lose your job, you’ll have to yank money out of your investments at the worst time.
Save up 3–6 months of bare-bones expenses in a high-yield savings account. Rent, food, insurance, gas. Boring? Yes. Essential? Absolutely. This is your foundation.
Step Two: The 55/20/25 Rule
Here’s the split I wish I’d learned years ago. It always adds up to 100%.
- 55% → Needs (the bills that keep you alive and out of trouble)
- 20% → Investing (retirement accounts, brokerage, long-term growth)
- 25% → Discretionary (the fun stuff that keeps you sane)
On $5,000/month income:
- $2,750 → Needs
- $1,000 → Investing
- $1,250 → Discretionary
Simple. Clean. No guesswork.
Step Three: Automate It
Here’s how:
- Grab your employer 401(k) match. It’s free money.
- Open a Roth IRA. Set it to auto-pull every month.
- Buy low-cost index funds. S&P 500. Total market. Done.
- Automate it all. Most brokerages let you set this up in 10 minutes. Pick the day after payday and forget it.
You don’t need fancy apps. You don’t need to “time the market.” You need consistency.
The Pushback
Can’t afford 20% right now? Fine. Start with 3–5%. The habit matters more than the number. Add a percent or two when you can.
Worried you’ll need the money? That’s what the safety net is for. Investments are for goals five years out or longer.
Feel like 20% is impossible? Start smaller. Keep stepping it up. You’ll get there in under two years if you stay consistent.
Why It Works
This setup covers your bills, protects you from disaster, grows your money, and still lets you enjoy life without guilt. It’s not about chasing a magic number. It’s about running a system that works when you’re not paying attention.
Final Word
Look, you don’t need to be a finance guru. You just need a plan that protects you, grows your money, and still leaves room to live your life.
The best time to start was yesterday. The second best is today.
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