6 Personal Finance Ratios You Need To Know
These simple equations can help you make better financial
decisions and grow your wealth — even if you're not a math wizard.
Want
to measure your financial health?
Personal
finance ratios, as well their closely-related cousin “rules of thumb,” are a
great starting point.
In a
matter of seconds, you can benchmark your current financial situation and
habits to make better decisions about your financial future.
But when
it comes to measuring your personal financial health, ratios don’t tell the
whole story.
In this
post, we’ll take a look at a few important numbers, dates, rules of thumb and
ratios that can help your improve your financial decision-making.
The Two Financial Milestones You Should Track
Tracking these dates is powerful because they take your entire financial picture into account — including your current assets, liabilities, income and expenses — giving you one number that shows exactly how you’re doing.
Note: For getting out of
debt, track the number of months it takes to become debt-free outside your
mortgage. For financial independence, track your expected age to reach your
goal.
With these
numbers in hand, you can make financial decisions with one simple question in
mind:
Will this increase or decrease my target
date?
How To Calculate Your Debt Payoff Date
Tracking
the number of months it will take to become debt-free should be the first thing
you do on your journey to financial independence.
But most
people avoid looking at this number. Which means they never gain clarity into
what they should do.
Calculate Your Financial Independent Date
The rule
of thumb for reaching financial independence is that you need to save 25X your
annual expenses. For example, to live on $40,000 a year, you’d need $1 million.
Traditionally, this is outside of any other income sources (such as social security, work from part - time jobs, etc…).
While you’ll want to calculate your target
financial independence date, the 25X rule of thumb is quite helpful in
decision-making.
For Example, say you have a taste for luxury cars. This may increase your expenses
by $200 a month or $2,400 a year (compared to what you’d pay for a non-luxury
car). You can afford it, so no big deal, right?
Well, just
know that to keep this up in retirement you’ll have to save an additional
$60,000.
It’s a good mental exercise to go through your expenses this way. Take a monthly expense and calculate it by 25X; that’s how much more you’ll need to save to continue to afford this expense.
Helpful Personal Finance Ratios
The Most Important Financial Ratio
What’s the
most important financial ratio — the one financial ratio I always make sure to
check?
My savings
ratio.
This is easy to calculate:
Savings Ratio = How Much You
Saved ÷ How Much You Made
For those
starting out, it’s better to track this number on a monthly basis. The formula
looks like this:
Savings Ratio = How Much You
Saved This Month ÷ Your Monthly Income
It’s also important to define what “saving” is. My preference is to count only savings I invest.
What’s the ideal number you should aim for? Some experts say 10%. Others say 20%.
My
preference? Don’t worry about the perfect savings ratio today. Instead, start
to track this
number.
Then, aim to increase it. If you increase it by 1% every
three months, in four years you’ll be saving 16% more than you are today.
2. Expense Ratios Of Investments
A study by
the Center for American Progress found that the average 401 K plan charges a 1 percent fee.
Another
study by the ICI found the average mutual fund expense fee is 0.63 percent.
Why are
these numbers important?
Look at
this example, from the Department of Labour (as relayed by Nerd
Wallet):
Assume that you are
an employee with 35 years until retirement and a current 401(k) account balance
of $25,000. If returns on investments in your account over the next 35 years
average 7 percent and fees and expenses reduce your average returns by 0.5
percent, your account balance will grow to $227,000 at retirement, even if
there are no further contributions to your account. If fees and expenses are
1.5 percent, however, your account balance will grow to only $163,000. The 1
percent difference in fees and expenses would reduce your account balance at
retirement by 28 percent.
That’s why
it’s important to know about any and all fees. But they’re called hidden fees
for a reason: because they’re hard to find.
3. The Emergency Fund Formula
How big is
your emergency fund?
To find
out, take your:
Cash on
Hand ÷ Monthly Expenses = Emergency Fund
The
general rule of thumb is that you want an emergency fund of at least three
months but no more than six months.
An emergency fund that’s too small puts you
at risk of not being able to deal with a financial setback. But an emergency
fund that’s too big means you’re losing money to opportunity cost.
However,
instead of worrying about rules of thumb, it’s better to answer this question:
How much cash do you need to feel comfortable
and sleep well at night?
In a study titled “How Your Bank Balance Buys Happiness", researchers found:
“Having readily
accessible sources of cash is of unique importance to life satisfaction, above
and beyond raw earnings, investments, or indebtedness.”
Everyone
is unique. My preference is to have as little as possible. I’ve gone with an
emergency fund as low as one month. However, I’m a personal finance geek who
likes to optimize everything.
Others may not be able to sleep well at night
with just one month of savings tucked away. Instead, they may prefer six months
(or even 12 months).
One tip to
help you calculate your ideal emergency fund is to imagine your financial
doomsday.
For Example, answer the following question:
What would I do today if I lost my income,
the value of my home cratered, and my portfolio dropped by half?
By
thinking through your actions in this scenario, you’ll get a clearer
perspective on the role an emergency fund would play in your life.
4. The 28/36 Rule
The first
thing you need to know about the 28/36 rule is that it’s not a
rule used in financial planning. Instead, it’s a rule lenders use to determine
how much debt you can “afford.”
The rule
states that you shouldn’t spend more than 28% of your monthly gross income on
housing (which includes principal, interest, taxes and insurance). Then, your
total debt payments (housing + all other debt) should not exceed 36% of your
income.
It’s
important to look at this ratio from both a lender’s and consumer’s
perspective.
For
lenders, the purpose of the 28/36 rule is to determine the largest amount of
debt a person can have.
In other words, the formula identifies the
largest amount of debt banks think you can manage with a reasonable chance of
paying it back. Remember, they want to loan you the most they can, as this
maximizes the bank’s bottom line (but not your finances).
So what’s
a better way to determine how much house you can actually afford?
5. How To Determine Your Asset Allocation
A general rule of
thumb for asset allocation is:
Stock Allocation = 100 – Your
Age
Specifically, one
should invest in a percentage of stocks equal to 100 minus their age, with a
bond allocation making up the remaining balance.
For example, a
40-year-old investor would invest in 60% stocks and 40% bonds.
While one can argue
this advice is outdated (I would agree), it still holds some value as a
starting point.
There’s clearly a misunderstanding of asset
allocation among investors both young and old.
As for this formula
being outdated: we have better models today to maximize return and minimize
risk. Nonetheless, the ratio teaches an important concept, which is that your
investing strategy should get more conservative as you age.
Final Thoughts
Peter
Drucker famously said, “What gets measured, gets managed.”
Another
quote of Drucker’s that’s not nearly as famous but just as true is, “There is
nothing so useless as doing efficiently that which should not be done at all.”
In
other words, it’s not just about tracking your personal finances: it’s also
about tracking the right things and using that information to make informed and
intelligent decisions that improve your life.