How much should you be saving? It’s a question that we ask a lot, and there are a number of rules of thumb. One answer is based on the 50/20/30 budgeting system. Popularized by Senator Elizabeth Warren, this rule of thumb suggests we should be saving 20% of our income.
Any general guideline, however, has shortcomings. For starters, how much we should save will vary based on our age, years to retirement, and overall goals. A 20 year old may not need to save the same amount as somebody in their 50’s who’s just starting to save for retirement. Yet if a general rule of thumb only gets us so far, how do we decide just how much to sock away each month?
Financial Freedom Calculator
To answer this question, I’ve created what I call the Financial Freedom Calculator. This simple spreadsheet can quickly estimate how long it will take you to achieve financial freedom based on the percentage of your income that you save. Below is a quick view of the calculator. We’ll walk through the underlying assumptions, and you can use this link to access the calculator (you’ll be prompted to make a copy of the spreadsheet so that you can edit it).
We achieve financial freedom when our investments can generate sufficient income to meet our living expenses. For most people, this occurs at a traditional retirement age, if at all. Others, like Mr. Money Mustache, achieve financial freedom at a very young age. The idea behind the Financial Freedom spreadsheet is to estimate how many years it will take you to achieve financial freedom. The spreadsheet uses the following assumptions and inputs:
- The Number: The spreadsheet assumes that financial freedom occurs when we’ve saved 25 times our annual spending. For example, for a family spending $75,000 a year, they would need to save 25 times this amount, or $1,875,000 to achieve financial freedom. This is based on the well known 4% withdrawal rate in retirement. You can change this assumption in the spreadsheet. Raising the withdrawal rate reduces the number you’ll need to save while lowering the withdrawal rate raises it.
- Rate of Return: The spreadsheet provides results based on annual returns ranging from 5% to 9% in 1% increments. As you’ll see, the rate of return significantly affects the time it will take to achieve financial freedom. In the section of the spreadsheet labeled “Have Fun With Your Own Numbers,” you can enter any rate of return you’d like.
- Inflation: The calculator does not adjust for inflation. However, you can factor in inflation based on the rate of return you choose.
- Income: The assumed annual income is $100,000. It was chosen as a nice round number. You can of course change this input once you create and save a copy of the spreadsheet. Note, however, that changing the annual income does not change the time it takes to achieve financial freedom. This may seem counter-intuitive at first, but remember that saving and spending are based on a percentage of income. Saving 10% of your income, regardless of whether you make $50,000 a year or $5,000,000, means that you are spending 90% of your income. Given an assumed annual return on investments, the time to save 25 times 90% of your income is the same.
- Saving/Spending: The spreadsheet assumes that your saving and spending added together equal 100% of your income. In retirement, however, you may spend significantly less than you spend during your working years. This could be the case for several reasons, including having a paid off mortgage, moving to a less expensive area of the country or providing for fewer family members (at least one hopes the children eventually move out!). For this reason, the “Have Fun With Your Own Numbers” section enables you to set specific dollar amounts for your savings and income, which together may not equal your current income. For example, a family making $100,000 and saving 20% today is spending 80% or $80,000. But in retirement they may plan to spend only $50,000.
- Current Savings: You can enter your current savings. Of course, the more you already have saved, the closer you are to financial freedom.
I hope you find the calculator useful. And if you have suggestions for ways to improve it, please leave a comment below.