Most online savings accounts have no minimum balance requirement at all

The typical online savings account requires zero dollars to open and zero dollars to keep open. Banks like Marcus, Ally, and American Express Personal Savings do not charge a monthly fee and do not require you to maintain any balance. You can deposit $1, earn interest on it, and never add another cent.

This is the defining difference between online banks and traditional brick-and-mortar banks. A Chase savings account at a physical branch might require $300 to $500 to avoid a monthly fee. An online bank strips that away because it has no tellers, no building leases, and no branch overhead to recover. The cost savings get passed to you as zero minimums.

That said, a handful of online banks do impose minimums, and some high-yield savings accounts tied to investment platforms have different rules. Knowing which category your account falls into matters because falling below the minimum can trigger a monthly fee that eats into your interest earnings.

Key Takeaways

  • Most online savings accounts require no minimum balance to open or maintain, and charge no monthly fee regardless of how little you deposit.
  • A few online banks do require minimums—typically $100 to $2,500—so check your account agreement or the bank's website before opening.
  • High-yield savings accounts offered through investment platforms or money market funds may have minimums that differ from traditional savings accounts.
  • If your account does have a minimum and you fall below it, the monthly fee usually ranges from $5 to $25 and can wipe out several months of interest.

Online banks with no minimum balance

The major online banks that dominate the market—Marcus, Ally, American Express Personal Savings, Discover Bank, and Synchrony Bank—all offer savings accounts with zero minimum balance and zero monthly maintenance fee. You can open an account with $1 if you want. There is no penalty for keeping a low balance, and no fee structure designed to push you toward depositing more.

These banks make money from lending, not from account fees. They lend out the deposits you make at rates higher than the interest they pay you. The interest rate they offer you (currently 4% to 5% APY at the best online banks, though this varies) is their cost of attracting your money. They do not need to charge you a fee on top of that.

If you are comparing online savings accounts and the bank's website does not mention a minimum balance requirement, you can assume there is none. The absence of a minimum is so standard that banks advertise it as a feature only when they are trying to stand out from competitors or when they are new to the market.

Online banks that do require a minimum balance

A smaller number of online banks impose minimums. Vanguard's online savings account requires a $10,000 minimum because it is part of an investment platform and targets customers who already have substantial assets. Fidelity's cash management account has a $25,000 minimum for the same reason. These are not traditional savings accounts in the consumer sense; they are cash-holding vehicles for people moving money between investments.

Some regional online banks and credit unions also maintain minimums. For example, certain online credit unions require $500 to $1,000 to open a savings account. These minimums are less common than they were ten years ago, but they still exist. The fee for falling below the minimum is usually $5 to $15 per month.

Before opening any online savings account, search the bank's website for "minimum balance" or "account requirements." If you cannot find the information, call or use the bank's chat feature and ask directly. A one-minute conversation now prevents a surprise fee later.

How minimum balance fees eat into your interest earnings

If your online savings account has a $500 minimum and you fall to $400, a $10 monthly fee kicks in. Over a year, that is $120 in fees. At a 4.5% interest rate, $400 earns roughly $18 in interest annually. The fee wipes out that interest and costs you an additional $102. You are paying the bank to hold your own money.

The damage compounds if you stay below the minimum for several months. A $15 monthly fee on a $300 balance costs you $180 per year—far more than the $13.50 in interest you would earn. The fee structure is designed to discourage low balances, which means the bank is betting you will either deposit more or close the account.

This is why zero-minimum accounts matter. If you have $300 to save and you put it in an online bank with no minimum, you earn interest with no offset. If you put it in a bank with a $500 minimum, you lose money every month until you deposit more.

Money market funds and high-yield savings alternatives

Some people use money market mutual funds or money market funds as savings vehicles because they offer higher yields than traditional savings accounts. These are not bank accounts, so they follow different rules. Vanguard's Federal Money Market Fund, for example, has a $3,000 minimum initial investment. Fidelity's Government Money Market Fund has a $2,500 minimum.

The trade-off is that these funds are not FDIC-insured the way bank savings accounts are. Your money is insured by the Securities Investor Protection Corporation (SIPC) up to $250,000, which is similar protection but technically different. The yields are often slightly higher than bank savings accounts, but the minimums are higher too.

If you have less than the minimum required by a money market fund, a regular online savings account with no minimum is the better choice. You get FDIC insurance, a competitive interest rate, and no barrier to entry.

What happens if you close an account below the minimum

If you have an account with a minimum balance requirement and you withdraw below that threshold, the bank will charge the monthly fee until you either deposit more or close the account. Closing the account does not erase the fee; you still owe it for the months you were below the minimum.

Some banks will waive a single month's fee if you call and ask, especially if you have been a customer for a long time or if you are closing the account. It is worth asking, but do not count on it. The safer move is to avoid accounts with minimums altogether if you know your balance will fluctuate.

If a bank has already charged you a fee for falling below the minimum and you believe it was an error, you can dispute it by calling customer service or submitting a complaint through the bank's website. Keep records of your balance on the dates the fees were charged. If the bank made a mistake, they will reverse the fee.

Frequently Asked Questions

Can I open an online savings account with $0 and deposit money later?

Most online banks allow you to open an account with $0 and fund it later, though some require an initial deposit of $1 to $25 to activate the account. Check the bank's website or call before opening. Once the account is open, there is no minimum you must maintain.

Do online savings accounts charge a fee if I don't use them?

No. Online banks do not charge inactivity fees. You can open an account, deposit money, and leave it untouched for years without paying a fee. The bank earns money from lending your deposit, so they want you to keep the account open.

What if my online bank changes its minimum balance policy?

Banks can change their terms, but they must notify you in advance—usually 30 days. If a bank adds a minimum balance requirement to your existing account, you will receive notice by email or mail. You can close the account without penalty during that notice period if you disagree with the change.

Is a high-yield savings account different from a regular online savings account in terms of minimums?

No. High-yield savings accounts at online banks (like Marcus or Ally) have the same zero-minimum structure as regular savings accounts at those banks. The "high-yield" label refers only to the interest rate, not to different account rules or fees.

Why would anyone use an online bank with a minimum when so many have none?

Usually because they are part of a larger platform. If you already have investments at Vanguard or Fidelity, their cash management accounts offer convenience and integration, even if they have minimums. For someone starting from scratch with no other accounts, a zero-minimum online bank is the simpler choice.