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What Leaving $40,000 in Traditional Savings Could Cost You Over 4 Years

Your $40,000 can stay safe and still earn more if the rate isn't stuck near the national average.

By Laura Hohenstein , Edited by Melinda Sineriz, ABFP®

Updated Sept. 18, 2026

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Quick Read

At a 4.00% annual percentage yield (APY), $40,000 earns about $6,794 over four years, or roughly $142 a month.
The same $40,000 at the FDIC national average savings rate of 0.38% (as of 08/17/26) earns about $611 over four years, or about $13 a month.
That leaves about $6,183 in missed interest over four years, before you change a single dollar of your balance.
At the national average savings rate of 0.38% (as of 06/15/26), $20,000 earns $76 a year. The same balance could earn up to nine times more with a SoFi Checking and Savings account. See SoFi®'s current rate.

A $40,000 savings balance usually feels like a win. It means you've built breathing room, kept cash available, and avoided tying up money you might need when life gets rude.

But the account label only tells you where the money sits. The rate determines what the money earns. Over four years, the difference between a traditional savings rate and a high-yield savings account rate can turn into real money.

With your own APY, you can check the four-year math and sort your $40,000 into the dollars that belong in high-yield savings and the dollars that should stay closer to checking.

$20,000 earning nothing could mean $66 a month, gone. Move it to SoFi and earn up to 4.00% APY on Savings for up to 6 months.¹ Earn up to 4.00% Annual Percentage Yield (APY) on one SoFi Savings account with a 0.90% APY Boost (added to the 3.10% APY as of 5/28/26) for up to 6 months. Open your first SoFi Checking and Savings account and receive eligible direct deposits OR qualifying deposits of $5,000 every 31 days by 12/31/26. Rates are variable, subject to change. Terms apply at <a href="https://www.sofi.com/banking/#4">sofi.com/banking#4</a>. SoFi Bank, N.A. Member FDIC.

The gap may be thousands

Say you find a high-yield savings account paying 4.00% APY, which is an achievable rate in the high-yield savings market right now. With $40,000 left there for four years, annual compounding grows the balance to about $46,794. That's about $6,794 in interest.

At the FDIC national average savings rate of 0.38% (as of 08/17/26), the same $40,000 grows by about $611 over four years. The difference is about $6,183. The original $40,000 stays intact in this comparison; the cost is the interest you miss.

If you have	One year at 0.38% APY (national average)	One year at 3.80% APY (example)	You are leaving behind
$10,000	$38	$380	$342
$25,000	$95	$950	$855
$40,000	$152	$1,520	$1,368
$50,000	$190	$1,900	$1,710
$100,000	$380	$3,800	$3,420

Run the same math yourself

The quickest way to check your own account is to use the APY shown on your savings account statement or app. Then plug the APY into this four-year formula:

$40,000 x ((1 + APY) ^ 4 - 1)

APY goes into the formula as a decimal, so 4.00% becomes 0.04. For the high-yield savings example, $40,000 x ((1 + 0.04) ^ 4 - 1) equals about $6,794 in interest over four years.

Now replace 0.04 with your actual savings APY. If your account matches the FDIC national average savings rate of 0.38% (as of 08/17/26), the same formula gives about $611 over four years. If your current APY is higher than the national average, your personal gap is smaller. If it's lower, the gap is bigger.

We did the research for you.

Having your checking and savings accounts with the same financial institution can make money management a lot simpler. SoFi® was our 2026 award winner for Best Checking and Savings Combo because it delivers on interest and additional features.

For example, you could earn up to 4.00% APY on your savings balance with direct deposit. (3.10% APY² New and existing Checking and Savings members who have not previously enrolled in Direct Deposit with SoFi are eligible to earn a cash bonus of either $50 (with at least $1,000 total Eligible Direct Deposits received within 25 calendar days of your first Eligible Direct Deposit of $1 or more) OR $400 (with at least $5,000 total Eligible Direct Deposits received within 25 calendar days of your first Eligible Direct Deposit of $1 or more). Cash bonus amount will be based on the total amount of Eligible Direct Deposit received within 25 calendar days of your first Eligible Direct Deposit of $1 or more. If you have satisfied the Eligible Direct Deposit requirements but have not received a cash bonus in your Checking account, please contact us at 855-456-7634 with the details of your Eligible Direct Deposit. Direct Deposit Promotion begins on 5/15/2026 and will be available through 12/31/26. See full bonus and annual percentage yield (APY) terms at <a href="https://www.sofi.com/banking/checking-offer/">sofi.com/banking/checking-offer/</a> with +0.90% APY Boost) for up to 6 Months on new accounts.¹ Earn up to 4.00% Annual Percentage Yield (APY) on one SoFi Savings account with a 0.90% APY Boost (added to the 3.10% APY as of 5/28/26) for up to 6 months. Open your first SoFi Checking and Savings account and receive eligible direct deposits OR qualifying deposits of $5,000 every 31 days by 12/31/26. Rates are variable, subject to change. Terms apply at <a href="https://www.sofi.com/banking/#4">sofi.com/banking#4</a>. SoFi Bank, N.A. Member FDIC. SoFi also offers more special features than any other account combo we looked at:

No account fees: No overdraft fees.³ Overdraft Coverage is a feature automatically offered to SoFi Checking and Savings account holders who receive at least $1,000 or more in Eligible Direct Deposits within a rolling 31 calendar day period on a recurring basis. Eligible Direct Deposit is defined on the SoFi Bank Rate Sheet, available at <a href="https://www.sofi.com/legal/banking-rate-sheet">https://www.sofi.com/legal/banking-rate-sheet</a>. Members enrolled in Overdraft Coverage may be covered for up to $50 in negative balances on SoFi Bank debit card purchases only. Overdraft Coverage does not apply to P2P transfers, bill payments, checks, or other non-debit card transactions. Members with a prior history of unpaid negative balances are not eligible for Overdraft Coverage. Eligibility for Overdraft Coverage is determined by SoFi Bank in its sole discretion. Members can check their enrollment status, if eligible, at any time by logging into their account through the SoFi app or on the SoFi website. No minimum balance fees. No monthly fees.⁴ We do not charge any account, service, or maintenance fees for SoFi Checking and Savings. We do charge transaction fees for outgoing wire transfers, Instant Transfers, and global remittance transfers. Our fee policy is subject to change at any time. See the SoFi Bank Fee Sheet for details at <a href="http://sofi.com/legal/banking-fees/">sofi.com/legal/banking-fees/</a>.

Get paid up to two days early: Feel the magic of payday up to two days earlier — automatically — when you set up direct deposit.⁵ Early access to direct deposit funds is based on the timing in which we receive notice of impending payment from the Federal Reserve, which is typically up to two days before the scheduled payment date, but may vary.

Access additional FDIC insurance up to $3M: Typically, single-member deposit accounts are federally insured up to $250,000. With SoFi, FDIC insurance up to $3 million on deposits is available through a seamless network of participating banks.⁶ SoFi Bank is a member FDIC and does not provide more than $250,000 of FDIC insurance per depositor per legal category of account ownership, as described in the FDIC’s regulations. Any additional FDIC insurance is provided by the SoFi Insured Deposit Program. Deposits may be insured up to $3M through participation in the program. See full terms at <a href="http://sofi.com/banking/fdic/sidpterms">SoFi.com/banking/fdic/sidpterms</a>. See list of participating banks at <a href="http://sofi.com/banking/fdic/participatingbanks">SoFi.com/banking/fdic/participatingbanks</a>.

Open an account with SoFi here.

The label is not enough

Two accounts can both say savings and still behave very differently for your wallet. A traditional savings account at a familiar brick-and-mortar institution can be convenient, especially if it sits beside your checking account. But convenience doesn't make the APY competitive.

A high-yield savings account is still built for cash you want available. The account is designed to pay more interest than many traditional savings accounts while keeping your money outside the stock market.

So the useful question is what your savings account is paying on the dollars you're leaving there. If the APY looks tiny, the four-year math is probably doing less work than your balance deserves.

Some dollars fit, some do not

Before moving any money, give each part of the $40,000 a job. That keeps the decision from turning into an all-or-nothing leap, because some cash really does need to sit exactly where it is.

Bill money needed this month should stay where payments can clear without delay.
Emergency savings can fit well in high-yield savings if you can tolerate a transfer window.
Planned spending several months away, like taxes, tuition, a vacation, or home repairs, might fit well too.
Cash already committed to a near purchase, such as a home closing in a few weeks, should stay in the account required for that transaction.
Money you won't need for five years or more might have outgrown the core purpose of a savings account.

That last bucket matters because high-yield savings is still savings. It's useful for safety and access rather than every long-term money goal. Once you sort the $40,000 by timing, the amount to compare could be the full balance, part of it, or none of it.

Your money is already saved. Now see how it could be earning you hundreds per year.

The hassles worth checking

The practical objections are real, and they're worth checking before you move suitable savings. Most are manageable, but a few can be dealbreakers depending on how quickly you need the money.

Transfer timing: Transfers between institutions may not be instant, and timing can vary by setup and transfer type. If you need money for rent due tomorrow, that cash belongs somewhere faster.
Emergency access: Some high-yield savings accounts let you move money quickly to a linked checking account, while others give you fewer access options. Check how you'd actually reach the money on a bad Tuesday, along with how the APY looks on a good one.
Deposit insurance: FDIC insurance generally covers up to $250,000 per depositor, per insured bank, per ownership category. NCUA insurance generally covers up to $250,000 per depositor, per insured credit union, per ownership category. Confirm coverage before you move money.
Minimums and fees: Some savings accounts have minimum balance rules or monthly fees. A good rate matters less if account rules eat into the interest, so check the fee schedule before you treat the APY as the whole story.
Rate changes: High-yield savings APYs can move up or down over time. If a 4.00% APY drops later, rerun the math and compare again.

The tradeoff is straightforward: high-yield savings usually gives you better interest while asking you to pay attention to access, fees, insurance, and rate changes. For money you don't need instantly, that tradeoff could be worth the extra dollars.

A partial move still counts

Maybe $40,000 is your full cash cushion, but only $30,000 can sit a step away from checking. That's still worth measuring.

At 4.00% APY, $30,000 in a high-yield savings account earns about $5,096 over four years with annual compounding. At the FDIC national average savings rate of 0.38% (as of 08/17/26), $30,000 earns about $459 over the same four years.

Source: Federal Reserve Bank of St. Louis, https://fred.stlouisfed.org/series/SNDR

The missed-interest gap on that $30,000 portion is about $4,637. The formula scales with the amount moved, so half the balance creates half the gap, and three-quarters of the balance creates three-quarters of the gap.

Bottom line

Leaving $40,000 in traditional savings at the FDIC national average savings rate of 0.38% (as of 08/17/26) means giving up about $6,183 compared with a high-yield savings account paying 4.00% APY over four years.

So check your current APY, sort your $40,000 by what each dollar needs to do, and run the four-year comparison on the part that fits. The right move could be the whole balance or only a slice, but the cost of ignoring the rate is measurable.

Would You Spend Ten Minutes for $1,465?

That's roughly the year's difference on $40,000 between the national average and the up-to-4.00% rates available now. And ten minutes isn't a figure of speech. You just provide some information, like your name, address, Social Security number, and the account your deposit money's coming from. But rates are variable and follow the market, which is why the only number worth acting on is today's. Compare the current top accounts here.

Bank/Institution	APY Annual Percentage Yield	Bonus Offer	Open Account	Bonus Offer
2026 AWARD WINNER Best Checking and Savings Combo
5.0 FinanceBuzz writers and editors score products and companies on a number of objective features as well as our expert editorial assessment. Our partners do not influence our ratings.	4.00 % APY With $0 min. balanceEarn up to 4.00% Annual Percentage Yield (APY) on one SoFi Savings account with a 0.90% APY Boost (added to the 3.10% APY as of 5/28/26) for up to 6 months. Open your first SoFi Checking and Savings account and receive eligible direct deposits OR qualifying deposits of $5,000 every 31 days by 12/31/26. Rates are variable, subject to change. Terms apply at sofi.com/banking#4. SoFi Bank, N.A. Member FDIC.	Limited-Time Offer: +0.90% boost on Savings APY to up to 4.00% for up to 6 months on new accounts¹ <p>Earn up to 4.00% Annual Percentage Yield (APY) on one SoFi Savings account with a 0.90% APY Boost (added to the 3.10% APY as of 5/28/26) for up to 6 months. Open your first SoFi Checking and Savings account and receive eligible direct deposits OR qualifying deposits of $5,000 every 31 days by 12/31/26. Rates are variable, subject to change. Terms apply at <a href="https://www.sofi.com/banking/#4">sofi.com/banking#4</a>. SoFi Bank, N.A. Member FDIC.</p> + $50 or $400 Bonus with eligible direct deposit.² <p>New and existing Checking and Savings members who have not previously enrolled in Direct Deposit with SoFi are eligible to earn a cash bonus of either $50 (with at least $1,000 total Eligible Direct Deposits received within 25 calendar days of your first Eligible Direct Deposit of $1 or more) OR $400 (with at least $5,000 total Eligible Direct Deposits received within 25 calendar days of your first Eligible Direct Deposit of $1 or more). Cash bonus amount will be based on the total amount of Eligible Direct Deposit received within 25 calendar days of your first Eligible Direct Deposit of $1 or more. If you have satisfied the Eligible Direct Deposit requirements but have not received a cash bonus in your Checking account, please contact us at 855-456-7634 with the details of your Eligible Direct Deposit. Direct Deposit Promotion begins on 5/15/2026 and will be available through 12/31/26. See full bonus and annual percentage yield (APY) terms at <a href="https://www.sofi.com/banking/checking-offer/">sofi.com/banking/checking-offer/</a></p> Terms apply.	Learn More on SoFi's secure website Member FDIC	Limited-Time Offer: +0.90% boost on Savings APY to up to 4.00% for up to 6 months on new accounts¹ <p>Earn up to 4.00% Annual Percentage Yield (APY) on one SoFi Savings account with a 0.90% APY Boost (added to the 3.10% APY as of 5/28/26) for up to 6 months. Open your first SoFi Checking and Savings account and receive eligible direct deposits OR qualifying deposits of $5,000 every 31 days by 12/31/26. Rates are variable, subject to change. Terms apply at <a href="https://www.sofi.com/banking/#4">sofi.com/banking#4</a>. SoFi Bank, N.A. Member FDIC.</p> + $50 or $400 Bonus with eligible direct deposit.² <p>New and existing Checking and Savings members who have not previously enrolled in Direct Deposit with SoFi are eligible to earn a cash bonus of either $50 (with at least $1,000 total Eligible Direct Deposits received within 25 calendar days of your first Eligible Direct Deposit of $1 or more) OR $400 (with at least $5,000 total Eligible Direct Deposits received within 25 calendar days of your first Eligible Direct Deposit of $1 or more). Cash bonus amount will be based on the total amount of Eligible Direct Deposit received within 25 calendar days of your first Eligible Direct Deposit of $1 or more. If you have satisfied the Eligible Direct Deposit requirements but have not received a cash bonus in your Checking account, please contact us at 855-456-7634 with the details of your Eligible Direct Deposit. Direct Deposit Promotion begins on 5/15/2026 and will be available through 12/31/26. See full bonus and annual percentage yield (APY) terms at <a href="https://www.sofi.com/banking/checking-offer/">sofi.com/banking/checking-offer/</a></p> Terms apply.
4.8 FinanceBuzz writers and editors score products and companies on a number of objective features as well as our expert editorial assessment. Our partners do not influence our ratings.	4.00 % APY With $250+ monthly depositsLevelUp Rate of 4.00% APY applied to full balance with $250+ in deposits in Evaluation Period. Otherwise, accounts earn Standard Rate of 3.00% APY. LevelUp Rate applies to first two statement cycles. Rates variable & subject to change at any time. See terms: https://www.happen.com/legal/deposits/levelup-savings-t-and-cs	—	Learn More on Happen Bank's secure website Member FDIC	—
4.9 FinanceBuzz writers and editors score products and companies on a number of objective features as well as our expert editorial assessment. Our partners do not influence our ratings.	3.64 % APY With $1 min. balance⁷ <p>APY means Annual Percentage Yield. APY is accurate as of as of 09/01/26. This is a variable rate account, Interest rate and APY may change after initial deposit. Minimum initial deposit to open account and earn interest is $1.00.</p>	Limited-Time Offer: Use code STACK to earn a cash bonus based on your savings balance. Earn up to $50 for $10,000, $125 for $25,000, $250 for $50,000, $500 for $100,000, or $1,000 for $200,000 or more. Visit site for full details.⁸ <p>New customers only. Earn a cash bonus (the "Welcome Bonus") when you deposit and maintain funds with partner banks on the Raisin platform. Customers will receive a Welcome Bonus of $40 for depositing between $10,000 and $24,999; $100 for depositing between $25,000 and $49,999; $200 for depositing between $50,000 and $99,999; $425 for depositing between $100,000 and $199,999; and $900 for depositing $200,000 or more. If the Qualifying Deposit balance declines at any time during the maintenance period below the minimum required for a bonus tier, the customer will be placed in the bonus tier corresponding to the lowest Qualifying Deposit balance maintained during that period. </p><p>Savings + CD Boost: Customers eligible for the Welcome Bonus may earn an additional bonus by opening a product in a second product category. To qualify, customers must deposit at least $1,000 into the secondary product category within 14 days of their initial deposit and maintain balances over $1,000 in both categories through 90 days from the initial deposit date.</p><p>For the purposes of this promotion, High-Yield Certificates of Deposit constitute one product category; No-Penalty CDs and Callable CDs constitute a second product category; and Savings Accounts (including Money Market Deposit Accounts, High-Yield Savings Accounts, and Rate Lock Savings Accounts) constitute a third product category. Savings + CD Boost eligibility is determined by your Welcome Bonus tier: customers depositing between $10,000–$24,999 receive an additional $10; $25,000–$49,999 receive an additional $25; $50,000–$99,999 receive an additional $50; $100,000–$199,999 receive an additional $75; and $200,000 or more receive an additional $100. </p><p>The Savings + CD Boost is optional and paid in addition to the Welcome Bonus. To qualify for the Welcome Bonus and Savings + CD Boost, your first deposit must be initiated between September 1, 2026, and September 30, 2026, by 11:59 PM ET, and the promo code STACK must be entered at the time of sign-up. Only funds deposited within 14 days of the initial deposit date and maintained with partner banks on the Raisin platform for 90 days of the initial deposit date will be eligible for the Welcome Bonus and Savings + CD Boost. Bonus cash will be credited directly to your Cash Account within 30 days of meeting all qualifying terms. This offer is available to new customers only, is non-transferable, and may not be combined with any other bonus offers. Raisin may modify or end this offer at any time and may withhold or revoke bonuses in cases of fraud, abuse, or violation of these terms or Raisin’s Terms of Service.</p>	Learn More on Raisin's secure website Member FDIC	Limited-Time Offer: Use code STACK to earn a cash bonus based on your savings balance. Earn up to $50 for $10,000, $125 for $25,000, $250 for $50,000, $500 for $100,000, or $1,000 for $200,000 or more. Visit site for full details.⁸ <p>New customers only. Earn a cash bonus (the "Welcome Bonus") when you deposit and maintain funds with partner banks on the Raisin platform. Customers will receive a Welcome Bonus of $40 for depositing between $10,000 and $24,999; $100 for depositing between $25,000 and $49,999; $200 for depositing between $50,000 and $99,999; $425 for depositing between $100,000 and $199,999; and $900 for depositing $200,000 or more. If the Qualifying Deposit balance declines at any time during the maintenance period below the minimum required for a bonus tier, the customer will be placed in the bonus tier corresponding to the lowest Qualifying Deposit balance maintained during that period. </p><p>Savings + CD Boost: Customers eligible for the Welcome Bonus may earn an additional bonus by opening a product in a second product category. To qualify, customers must deposit at least $1,000 into the secondary product category within 14 days of their initial deposit and maintain balances over $1,000 in both categories through 90 days from the initial deposit date.</p><p>For the purposes of this promotion, High-Yield Certificates of Deposit constitute one product category; No-Penalty CDs and Callable CDs constitute a second product category; and Savings Accounts (including Money Market Deposit Accounts, High-Yield Savings Accounts, and Rate Lock Savings Accounts) constitute a third product category. Savings + CD Boost eligibility is determined by your Welcome Bonus tier: customers depositing between $10,000–$24,999 receive an additional $10; $25,000–$49,999 receive an additional $25; $50,000–$99,999 receive an additional $50; $100,000–$199,999 receive an additional $75; and $200,000 or more receive an additional $100. </p><p>The Savings + CD Boost is optional and paid in addition to the Welcome Bonus. To qualify for the Welcome Bonus and Savings + CD Boost, your first deposit must be initiated between September 1, 2026, and September 30, 2026, by 11:59 PM ET, and the promo code STACK must be entered at the time of sign-up. Only funds deposited within 14 days of the initial deposit date and maintained with partner banks on the Raisin platform for 90 days of the initial deposit date will be eligible for the Welcome Bonus and Savings + CD Boost. Bonus cash will be credited directly to your Cash Account within 30 days of meeting all qualifying terms. This offer is available to new customers only, is non-transferable, and may not be combined with any other bonus offers. Raisin may modify or end this offer at any time and may withhold or revoke bonuses in cases of fraud, abuse, or violation of these terms or Raisin’s Terms of Service.</p>

Limited-Time Offer

2026 AWARD WINNER Best Checking and Savings Combo

SoFi Checking and Savings

5.0

Open Account on SoFi's secure website, Member FDIC

APY

4.00%

Minimum Balance for APY

Bonus Offer

Up to $400

Why We Like It

Limited-Time Offer: Earn a $50 or $400 cash bonus² New and existing Checking and Savings members who have not previously enrolled in Direct Deposit with SoFi are eligible to earn a cash bonus of either $50 (with at least $1,000 total Eligible Direct Deposits received within 25 calendar days of your first Eligible Direct Deposit of $1 or more) OR $400 (with at least $5,000 total Eligible Direct Deposits received within 25 calendar days of your first Eligible Direct Deposit of $1 or more). Cash bonus amount will be based on the total amount of Eligible Direct Deposit received within 25 calendar days of your first Eligible Direct Deposit of $1 or more. If you have satisfied the Eligible Direct Deposit requirements but have not received a cash bonus in your Checking account, please contact us at 855-456-7634 with the details of your Eligible Direct Deposit. Direct Deposit Promotion begins on 5/15/2026 and will be available through 12/31/26. See full bonus and annual percentage yield (APY) terms at <a href="https://www.sofi.com/banking/checking-offer/">sofi.com/banking/checking-offer/</a> plus a boosted 4.00% APY¹ Earn up to 4.00% Annual Percentage Yield (APY) on one SoFi Savings account with a 0.90% APY Boost (added to the 3.10% APY as of 5/28/26) for up to 6 months. Open your first SoFi Checking and Savings account and receive eligible direct deposits OR qualifying deposits of $5,000 every 31 days by 12/31/26. Rates are variable, subject to change. Terms apply at <a href="https://www.sofi.com/banking/#4">sofi.com/banking#4</a>. SoFi Bank, N.A. Member FDIC. on Savings for up to 6 months when you open a new account and set up eligible direct deposits. Terms apply.
No account, overdraft, or monthly fees⁴ We do not charge any account, service, or maintenance fees for SoFi Checking and Savings. We do charge transaction fees for outgoing wire transfers, Instant Transfers, and global remittance transfers. Our fee policy is subject to change at any time. See the SoFi Bank Fee Sheet for details at <a href="http://sofi.com/legal/banking-fees/">sofi.com/legal/banking-fees/</a>.
Get your paycheck up to two days early with direct deposit⁵ Early access to direct deposit funds is based on the timing in which we receive notice of impending payment from the Federal Reserve, which is typically up to two days before the scheduled payment date, but may vary.
Access additional FDIC insurance up to $3 million⁶ SoFi Bank is a member FDIC and does not provide more than $250,000 of FDIC insurance per depositor per legal category of account ownership, as described in the FDIC’s regulations. Any additional FDIC insurance is provided by the SoFi Insured Deposit Program. Deposits may be insured up to $3M through participation in the program. See full terms at <a href="http://sofi.com/banking/fdic/sidpterms">SoFi.com/banking/fdic/sidpterms</a>. See list of participating banks at <a href="http://sofi.com/banking/fdic/participatingbanks">SoFi.com/banking/fdic/participatingbanks</a>.
Excellent 4.3/5

Open Account on SoFi's secure website, Member FDIC