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In a previous post, I explained that saving the first $100k is the hardest net worth milestone to reach. Every subsequent $100k takes less and less time to save, though.
In fact, it takes more time to go from 0 to $100k than $600k to $1 million, assuming consistent $10k annual savings and 7% annual investment returns:
Recently, I was thinking about this chart when a thought popped into my head:
How much do investment returns account for net worth growth over time?
For example, when your net worth increases from $0 to $100k, how much of that increase comes from savings and how much comes from investment returns?
What about when you go from $100k to $200k?
Or $200k to $300k?
Savings vs. Investment Returns
To answer this question, here is a chart that shows how much investment returns account for net worth growth, for every $100k net worth milestone up to $1 million:
Someone who saves and invests $10,000 each year at a 7% interest rate will accumulate $100k in 7.84 years. Out of this $100k, 78% of it will be composed purely of savings. The other 22% will be composed of investment returns.
This is why, if you’re at the beginning of your net worth journey, you should focus on saving as much of your income as possible. Most of your net worth increase in those early years will come from savings, not investment returns.
Notice how investment returns start to become more influential as your net worth increases, though.
When you increase your net worth from $100k to $200k, 51% of that increase will come from savings and 49% will come from investment returns.
For each $100k net worth milestone, investment returns begin to account for more and more of the increase.
By the time you reach $900k, a whopping $86,000 of the last $100,000 you need to reach $1 million will come from investment returns.
Savings as a Percentage of Net Worth
To see the effect of different interest rates, here is a chart that shows what percentage of $100k net worth increases are composed of savings:
How to interpret this chart: Take a look at the 3% Annual Interest Rate column. When you increase your net worth from $0 to $100k, 89% of that increase will come from your savings. When you increase your net worth from $100k to $200k, 70% of that increase will come from your savings, and so on.
Notice how the majority of your first $100k will come from savings, no matter how stellar your investment returns are. But as your net worth increases, savings account for a smaller and smaller percentage of each $100k increase.
Keep in mind that this specific example assumes you save $10,000 every year. If you save more than that, your savings will account for a higher percentage of each $100k net worth increase.
No matter how much you save each year, a similar trend shows up: In the early years, your savings are far more important than your investment returns. As time goes on, investment returns become more influential.
Once your investment returns begin to overtake your savings, your net worth begins to skyrocket. That’s why, in the first example, it takes more time for someone to increase their net worth from $0 to $100k than from $600k to $1 million.
The takeaway here is simple: Grind it out in the beginning to build a solid foundation. After you reach a certain point, investment returns will begin to make life easier.
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