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The marginal propensity to save (MPS) refers to the amount of disposable income a consumer is able to save. It’s used to reflect the proportion someone is willing to save for each additional dollar of their income.

To understand why MPS is important when quantifying fluctuations in savings and income, we’ll go over how to calculate MPS and how to apply it to your budgeting strategy.

What is the Marginal Propensity to Save?

The marginal propensity to save is defined as the portion of an increase in income that goes towards household savings. In other words, it’s the percentage of additional income a household saves instead of spending on goods and services, and it offers insight into the consumption habits of consumers.

MPS is also referred to as leakage, where the savings is an amount (expressed as a percentage that doesn’t go back into the economy via consumption. Typically, the more a household saves, the more likely it indicates that there is a higher income and better equipped to cover their household expenses.

So, theoretically, if a household saves 10%, it means that for every additional dollar they earn, they’ll save 10 cents.

When consumers are more likely to save as their income grows, the chances are higher they’ll become wealthier. Plus, households will also be able to access services and goods that require more money, such as larger homes in higher cost of living areas, elaborate vacations, or luxury vehicles.

How Income Level Affects Marginal Propensity to Save

Given data on household income and household saving, economists can calculate households’ MPS by income level. This calculation is important because MPS is not constant—it varies by income level. Typically, the higher the income, the higher the MPS because as wealth increases so does the ability to satisfy needs and wants, and so each additional dollar is less likely to go toward additional spending. However, the possibility remains that a consumer might alter savings and consumption habits with an increase in pay.

The Multiplier Effect

The MPS plays an important part in regulating the multiplier effect. The multiplier effect looks at the proportional increase or decrease in income that comes from consumption or savings.

For instance, if there is spending at the government level, it’ll have a multiplier effect (much like how a snowball rolls down a hill) on different parts of the economy. This change is due to the fact there is now additional disposable income consumers can spend on consumption and savings.

By understanding what the MPS is, economists can see how increased government spending can influence savings. It’ll also help to determine how consumers’ saving habits will influence the overall economy. The lower the MPS, the more of an impact on changes in government spending there will be.

Calculating the Marginal Propensity to Save

Calculating the MPS involves dividing the change in savings by a change in disposable income.

The following formula is used to calculate the MPS:

MPS = change in savings / change in disposable income

The savings represented by the value of the MPS will change if income changes by a dollar. Presented on a graph, the MPS is the equivalent of the savings line that’s created by plotting changes in income on the horizontal line (x-axis) and changes in savings on the vertical line (y-axis).

Another important point to note is that MPS will range between zero and one. If the MPS is zero, then it means changes in income doesn’t have an effect on savings (consumers spend all additional income). If MPS is one, then all additional income is saved.

Example

Jasmine successfully negotiated a promotion and annual bonus and received an additional $3,000 with her next paycheck. Jasmine decides she wants to spend this amount on a nice dinner out with friends totaling $150, and a vacation in Mexico for $2,000. The total she spends out of her bonus is $2,150, saving $850.

Using the above MPS formula, the calculation is as follows:

$850 / $3,000 = 0.283 = 28.3%

Therefore, Jasmine saved 28% of her additional income or 28 cents for each additional dollar she earns.

Remember, MPS isn’t constant since various factors in addition to changes in income will influence consumer spending habits. For instance, the time of the year can influence seasonal trends, which can correlate with higher spending.

Applying MPS to Your Budget Strategy

Though it seems like MPS is more for economists, you can apply this tactic to your personal budget.

When it comes to increasing your income, it might be tempting to spend a large portion of it. After all, you might want to celebrate a pay raise or promotion. Or, you might decide to increase your grocery budget, swapping out some of your regular produce for organic varieties.

However, there are benefits to saving some of the extra money. Perhaps you have a financial goal you can use it towards, like saving for a down payment on a house. Or you want to start investing and with this boost in income, you now have the means to do so.

If you haven’t yet decided what you’re saving for, just getting into the habit of saving will get you on the right track. Plus, you’ll learn how to budget effectively, no matter which type of budgeting technique you use.

Let’s say you want to be able to set aside 20% of each paycheck towards investments and a larger emergency fund. You received a $1,000 bonus from work this month and want to make sure you’re not tempted to spend it all.

Using the above formula, you want to have an MPS of 30%, or 0.3. That means with that bonus, you want to be able to save $300, allowing you to put $800 of it towards other areas in your budget. Once you have this number, you can take proactive steps to save that money. Automatically transferring $300 to a separate savings account is a good start.

Considering your income may fluctuate, you’ll probably want to revisit this formula on occasion to make sure you’re on track. Plus, it’s likely your spending habits will also change—such as spending more during the holidays—so if you need to spend more, then you can adjust your savings rate temporarily. At the end of the day, it’s all about being aware of where your money is going.

Recommended: 39 Ways to Earn Passive Income Streams

The Takeaway

Marginal propensity to save may seem like a term that doesn’t relate to your budget since it’s normally used to help economists. However, thinking about it in simple terms such as a savings rate is more helpful. That way, you can use it to apply it towards your savings goals and budgeting tactics as your income changes.

Saving money is half the battle: making sure your money is working for you is the other half. Opening a checking and savings account with SoFi can earn you more than the national interest average, squeezing even more value from your hard-earned dollars.

Photo credit: iStock/Toxitz

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SoFi members with direct deposit activity can earn 4.60% annual percentage yield (APY) on savings balances (including Vaults) and 0.50% APY on checking balances. Direct Deposit means a deposit to an account holder’s SoFi Checking or Savings account, including payroll, pension, or government payments (e.g., Social Security), made by the account holder’s employer, payroll or benefits provider or government agency (“Direct Deposit”) via the Automated Clearing House (“ACH”) Network during a 30-day Evaluation Period (as defined below). Deposits that are not from an employer or government agency, including but not limited to check deposits, peer-to-peer transfers (e.g., transfers from PayPal, Venmo, etc.), merchant transactions (e.g., transactions from PayPal, Stripe, Square, etc.), and bank ACH funds transfers and wire transfers from external accounts, do not constitute Direct Deposit activity. There is no minimum Direct Deposit amount required to qualify for the stated interest rate.

SoFi members with Qualifying Deposits can earn 4.60% APY on savings balances (including Vaults) and 0.50% APY on checking balances. Qualifying Deposits means one or more deposits that, in the aggregate, are equal to or greater than $5,000 to an account holder’s SoFi Checking and Savings account (“Qualifying Deposits”) during a 30-day Evaluation Period (as defined below). Qualifying Deposits only include those deposits from the following eligible sources: (i) ACH transfers, (ii) inbound wire transfers, (iii) peer-to-peer transfers (i.e., external transfers from PayPal, Venmo, etc. and internal peer-to-peer transfers from a SoFi account belonging to another account holder), (iv) check deposits, (v) instant funding to your SoFi Bank Debit Card, (vi) push payments to your SoFi Bank Debit Card, and (vii) cash deposits. Qualifying Deposits do not include: (i) transfers between an account holder’s Checking account, Savings account, and/or Vaults; (ii) interest payments; (iii) bonuses issued by SoFi Bank or its affiliates; or (iv) credits, reversals, and refunds from SoFi Bank, N.A. (“SoFi Bank”) or from a merchant.

SoFi Bank shall, in its sole discretion, assess each account holder’s Direct Deposit activity and Qualifying Deposits throughout each 30-Day Evaluation Period to determine the applicability of rates and may request additional documentation for verification of eligibility. The 30-Day Evaluation Period refers to the “Start Date” and “End Date” set forth on the APY Details page of your account, which comprises a period of 30 calendar days (the “30-Day Evaluation Period”). You can access the APY Details page at any time by logging into your SoFi account on the SoFi mobile app or SoFi website and selecting either (i) Banking > Savings > Current APY or (ii) Banking > Checking > Current APY. Upon receiving a Direct Deposit or $5,000 in Qualifying Deposits to your account, you will begin earning 4.60% APY on savings balances (including Vaults) and 0.50% on checking balances on or before the following calendar day. You will continue to earn these APYs for (i) the remainder of the current 30-Day Evaluation Period and through the end of the subsequent 30-Day Evaluation Period and (ii) any following 30-day Evaluation Periods during which SoFi Bank determines you to have Direct Deposit activity or $5,000 in Qualifying Deposits without interruption.

SoFi Bank reserves the right to grant a grace period to account holders following a change in Direct Deposit activity or Qualifying Deposits activity before adjusting rates. If SoFi Bank grants you a grace period, the dates for such grace period will be reflected on the APY Details page of your account. If SoFi Bank determines that you did not have Direct Deposit activity or $5,000 in Qualifying Deposits during the current 30-day Evaluation Period and, if applicable, the grace period, then you will begin earning the rates earned by account holders without either Direct Deposit or Qualifying Deposits until you have Direct Deposit activity or $5,000 in Qualifying Deposits in a subsequent 30-Day Evaluation Period. For the avoidance of doubt, an account holder with both Direct Deposit activity and Qualifying Deposits will earn the rates earned by account holders with Direct Deposit.

Members without either Direct Deposit activity or Qualifying Deposits, as determined by SoFi Bank, during a 30-Day Evaluation Period and, if applicable, the grace period, will earn 1.20% APY on savings balances (including Vaults) and 0.50% APY on checking balances.

Interest rates are variable and subject to change at any time. These rates are current as of 10/24/2023. There is no minimum balance requirement. Additional information can be found at https://www.sofi.com/legal/banking-rate-sheet.

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A hospital bill in the thousands. A vet invoice for hundreds. A car repair for more than you make in a month. When faced with an emergency, it can compound the problem to try to figure out how to pay for the unexpected expenses, on top of an already stressful situation.

If you find yourself questioning, “Should I have an emergency fund?” the answer should be a resounding yes, absolutely! But where to begin? Forty percent of Americans say they are unable to afford even a $400 emergency expense.

Conventional wisdom claims you should have enough money saved in an emergency fund to cover at least three to six months of expenses, depending on your personal financial situation.

But with looming student debt, credit card payments, or other big financial burdens, it can be hard to imagine saving while keeping up with all of your bills and expenses. Emergency funds are great for major unexpected expenses, but preparing for the unexpected still takes time and planning.

Beefing up Your Budget

One of the first ways you can start saving up for an emergency fund is to evaluate your current spending habits and create a budget, if you don’t already have one. Take a look at where there is fat to trim, meaning extra expenses you can minimize or eliminate.

Start with a simple spreadsheet, which should help you break down your spending to see your total income, plus what you spend on necessities like rent, loan payments and groceries, discretionary spending like shopping or entertainment, and long-term goals, including emergency fund savings or retirement.

For a two-income household, you could aim to have three months of expenses in your basic emergency fund, with six months for a one-income household.

In a recent survey, 67% of millennials report having a savings goal and sticking with it every month, or most months. Your overall savings goal might actually include more than just saving for an emergency fund.

One common tactic for an easy budget to stick to is to put 20% of your take-home income toward financial goals, such as savings, and then make part of that just for your emergency fund.

You might want to look at your current bills and deadlines and see what you can adjust to make the most sense with your paydays. If you get paid every two weeks, but all of your bills are due at the end of the month, maybe you find you are dipping into those savings to pay everything on time.

You could try spreading out your bills throughout the month or grouped closer to your paychecks, so you can better budget your money throughout the year. Everybody’s financial situation is different, so figure out what works for you—and stick with it.

Having an emergency fund means you’ll be better prepared to cover any urgent, unplanned financial crises, like a high medical bill or costly car repair, without ruining your normal budgeted living expenses. With money set aside, you’ll be able to stress less and avoid more costly solutions like credit cards or personal loans to fund any emergencies.

However, one possible disadvantage to trying to build up your emergency fund is that you might feel like that money should be going toward paying off debt, like student loans or credit cards, before storing away funds in savings. But it’s important to know good debt from bad in this case.

A mortgage or student loan is generally considered good debt, while a high-interest credit card can be worse for your overall credit score and financial health. If you are weighing paying off debt versus building up your emergency fund, you might consider this order to figure out your top priorities:

•   Make sure you have enough money in the bank to pay any recurring bills.
•   Build a safety net equal to one month of your basic expenses
•   Match any contributions your employer makes for retirement contributions.
•   Pay off bad debt, like high-interest credit cards.
•   Build up your emergency fund.

Once you have three to six months’ worth of expenses saved up for your emergency fund, you can refocus your budget on other long-term goals.

Putting Savings on Auto Drive

If you already use direct deposit, you’ve already got a possible solution to help you fund an emergency reserve. You can set up a recurring transfer with your bank, or split your direct deposit into a checking and a savings account, in order to make savings automatic.

If you don’t notice the money sitting in your account in the first place, it might be less tempting to spend it or move it back out of savings.

So how much can you afford to automatically transfer? The Consumer Federation of America says that an emergency savings fund should consist of at least $500 . They recommend using a savings account that you do not have easy access to, perhaps at a different bank than your current home bank.

You can kick-start your emergency fund by using a cash windfall like a tax refund, work bonus, or birthday check.

You could aim first to get to $500, then $1,000, then one month of essential living expenses, and work your way up from there.

You probably aren’t going to generate three or six months worth of extra money all at once.

Automating your savings might help, whether you choose to have a certain amount from your paycheck transferred into a separate savings account, or set up recurring transfers from checking to savings with your bank.

Then, when you do reach a comfortable number in your emergency fund, you can redirect those automated savings toward other financial goals like paying off debt or funding retirement.

Saving Smarter, Not Harder

So, if you’re determined to start saving more for an emergency fund, you might want to explore exactly what kind of savings account you want to keep your money in.

Certain accounts can earn you significantly more money based on the amount of interest. This could help your emergency fund grow even faster while rewarding you for saving money rather than spending it.

In fact, a SoFi Checking and Savings® account has no account fees. Plus, as a SoFi member, you’ll also receive other benefits to help you figure out your finances, like career coaching, mobile transfers, financial advisors, and community events.

We work hard to charge zero account fees. With that in mind, our fee structure is subject to change at any time.

Before you start saving up for an emergency fund, consider what kind of account you want to keep that money in. It can be helpful to have easy access to cash, in case you are ever faced with a financial emergency.

External Websites: The information and analysis provided through hyperlinks to third-party websites, while believed to be accurate, cannot be guaranteed by SoFi. Links are provided for informational purposes and should not be viewed as an endorsement.

SoFi® Checking and Savings is offered through SoFi Bank, N.A. ©2022 SoFi Bank, N.A. All rights reserved. Member FDIC. Equal Housing Lender.
SoFi Money® is a cash management account, which is a brokerage product, offered by SoFi Securities LLC, member
FINRA / SIPC . SoFi Securities LLC is an affiliate of SoFi Bank, N.A. SoFi Money Debit Card issued by The Bancorp Bank.
SoFi has partnered with Allpoint to provide consumers with ATM access at any of the 55,000+ ATMs within the Allpoint network. Consumers will not be charged a fee when using an in-network ATM, however, third party fees incurred when using out-of-network ATMs are not subject to reimbursement. SoFi’s ATM policies are subject to change at our discretion at any time.
SoFi members with direct deposit activity can earn 4.60% annual percentage yield (APY) on savings balances (including Vaults) and 0.50% APY on checking balances. Direct Deposit means a deposit to an account holder’s SoFi Checking or Savings account, including payroll, pension, or government payments (e.g., Social Security), made by the account holder’s employer, payroll or benefits provider or government agency (“Direct Deposit”) via the Automated Clearing House (“ACH”) Network during a 30-day Evaluation Period (as defined below). Deposits that are not from an employer or government agency, including but not limited to check deposits, peer-to-peer transfers (e.g., transfers from PayPal, Venmo, etc.), merchant transactions (e.g., transactions from PayPal, Stripe, Square, etc.), and bank ACH funds transfers and wire transfers from external accounts, do not constitute Direct Deposit activity. There is no minimum Direct Deposit amount required to qualify for the stated interest rate.

SoFi members with Qualifying Deposits can earn 4.60% APY on savings balances (including Vaults) and 0.50% APY on checking balances. Qualifying Deposits means one or more deposits that, in the aggregate, are equal to or greater than $5,000 to an account holder’s SoFi Checking and Savings account (“Qualifying Deposits”) during a 30-day Evaluation Period (as defined below). Qualifying Deposits only include those deposits from the following eligible sources: (i) ACH transfers, (ii) inbound wire transfers, (iii) peer-to-peer transfers (i.e., external transfers from PayPal, Venmo, etc. and internal peer-to-peer transfers from a SoFi account belonging to another account holder), (iv) check deposits, (v) instant funding to your SoFi Bank Debit Card, (vi) push payments to your SoFi Bank Debit Card, and (vii) cash deposits. Qualifying Deposits do not include: (i) transfers between an account holder’s Checking account, Savings account, and/or Vaults; (ii) interest payments; (iii) bonuses issued by SoFi Bank or its affiliates; or (iv) credits, reversals, and refunds from SoFi Bank, N.A. (“SoFi Bank”) or from a merchant.

SoFi Bank shall, in its sole discretion, assess each account holder’s Direct Deposit activity and Qualifying Deposits throughout each 30-Day Evaluation Period to determine the applicability of rates and may request additional documentation for verification of eligibility. The 30-Day Evaluation Period refers to the “Start Date” and “End Date” set forth on the APY Details page of your account, which comprises a period of 30 calendar days (the “30-Day Evaluation Period”). You can access the APY Details page at any time by logging into your SoFi account on the SoFi mobile app or SoFi website and selecting either (i) Banking > Savings > Current APY or (ii) Banking > Checking > Current APY. Upon receiving a Direct Deposit or $5,000 in Qualifying Deposits to your account, you will begin earning 4.60% APY on savings balances (including Vaults) and 0.50% on checking balances on or before the following calendar day. You will continue to earn these APYs for (i) the remainder of the current 30-Day Evaluation Period and through the end of the subsequent 30-Day Evaluation Period and (ii) any following 30-day Evaluation Periods during which SoFi Bank determines you to have Direct Deposit activity or $5,000 in Qualifying Deposits without interruption.

SoFi Bank reserves the right to grant a grace period to account holders following a change in Direct Deposit activity or Qualifying Deposits activity before adjusting rates. If SoFi Bank grants you a grace period, the dates for such grace period will be reflected on the APY Details page of your account. If SoFi Bank determines that you did not have Direct Deposit activity or $5,000 in Qualifying Deposits during the current 30-day Evaluation Period and, if applicable, the grace period, then you will begin earning the rates earned by account holders without either Direct Deposit or Qualifying Deposits until you have Direct Deposit activity or $5,000 in Qualifying Deposits in a subsequent 30-Day Evaluation Period. For the avoidance of doubt, an account holder with both Direct Deposit activity and Qualifying Deposits will earn the rates earned by account holders with Direct Deposit.

Members without either Direct Deposit activity or Qualifying Deposits, as determined by SoFi Bank, during a 30-Day Evaluation Period and, if applicable, the grace period, will earn 1.20% APY on savings balances (including Vaults) and 0.50% APY on checking balances.

Interest rates are variable and subject to change at any time. These rates are current as of 10/24/2023. There is no minimum balance requirement. Additional information can be found at https://www.sofi.com/legal/banking-rate-sheet.

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