A jumbo CD is a certificate of deposit with a large balance. That is the whole definition, because there is no other one: no statute or regulation defines "jumbo", no threshold triggers any disclosure, and a bank may use the word for any amount it likes or not use it at all. The convention is $100,000. The clearest evidence for that convention is the FDIC's own monthly survey of deposit rates, which measures certificates at two balance tiers, $10,000 and $100,000, and publishes the average of the two as the national CD rate.
Read that last sentence again, because it is the most useful thing the regulator says about jumbo certificates. It does not publish the $100,000 tier separately. The two are blended into one number. That is not proof the tiers are identical, but it is a fair hint about how much difference the regulator thinks the extra zero makes.
This page prints no bank's rate, for the reasons on the hub page for this cluster. It is about what a six-figure certificate actually buys, what it risks, and the comparison that starts to matter at that size — which is not with other CDs.
The premium, measured rather than assumed
The intuition behind a jumbo CD is that a bank will pay more for a large deposit. Sometimes it will. At the large online banks whose certificate pages were checked in September 2026, each published a single rate per term with no balance tier on the page: $500 and $150,000 bought the same certificate at the same rate. Where a jumbo tier does exist — more often at branch banks, credit unions and in brokered certificates — the premium over the standard rate is commonly measured in basis points, not percentage points. It is a real number and it is worth collecting. It is rarely a large one.
Here is what the premium is worth, on $100,000, with the tax at an illustrative 22% marginal rate:
| Jumbo premium | Extra interest per year | After tax |
|---|---|---|
| 0.10 percentage points | $100 | $78 |
| 0.25 percentage points | $250 | $195 |
Worth having. Not worth the two things people routinely trade for it, which are the next two sections.
What a jumbo balance risks that a small one does not
The insurance limit
FDIC coverage is $250,000 per depositor, per insured bank, per ownership category, and it covers principal plus accrued interest through the date a bank closes. A $100,000 certificate in a single-ownership account at one bank is comfortably inside that. Two of them at the same bank plus a savings account is not, and the part above the limit is not insured — it becomes a claim on whatever the failed bank's assets eventually fetch.
The word doing the work is per insured bank, which means per charter, not per brand. A saver who splits $400,000 between two consumer brands that turn out to share one charter has diversified nothing, and nothing in either brand's marketing will say so. Online banks for high-yield savings explains how to check a charter with the FDIC's BankFind tool; it takes a minute and is the single most consequential check at this size.
The limit is also per ownership category, which is the legitimate way to hold more than $250,000 at one bank:
- A joint certificate is insured for each co-owner's share up to $250,000 — the FDIC assumes the shares are equal unless the account records say otherwise — so two co-owners are covered to $500,000, separately from their individual accounts at the same bank. Couples and money covers what joint ownership means legally, which is more than an insurance decision.
- A payable-on-death or trust certificate has been insured, since April 1, 2024, at $250,000 per unique eligible beneficiary, up to five beneficiaries — a maximum of $1,250,000 per owner per bank.
- Certain retirement accounts — an IRA CD, for instance — are a separate category, insured up to $250,000 in aggregate per person per bank.
The insurance page sets these out in full, with what happens on the day a bank fails.
The exit price, which scales with the balance
An early-withdrawal penalty is a slice of interest, and interest is proportional to the balance. A 90-day penalty on $100,000 at an illustrative 4.00% is $986.30. The rate premium above — $100 a year for a tenth of a point — does not survive a single early exit. At six figures the penalty clause is not a footnote; it is the largest number on the page, and the penalty page is the place to price it before signing anything.
The standard defence is not to put the whole amount in one certificate at all. Four $25,000 certificates at staggered maturities — a ladder — mean that an unexpected need for $25,000 costs at most one small penalty, or none if a rung is close to maturing, instead of $986 on the lot.
The comparison that changes at $100,000
Below about $25,000 the practical comparison is between certificates. At $100,000 and above, two other instruments enter, and the rate table does not show either.
Treasury bills and notes. A Treasury has no early-withdrawal penalty (you sell it at the market price instead), no insurance limit to manage because it is a direct obligation of the government, and interest that is exempt from state and local income tax. That exemption is worth roughly your state rate multiplied by the yield: at 6% on an illustrative 3.90% yield, about $234 a year on $100,000 and $585 on $250,000 — more than most jumbo premiums, before you have even compared the headline rates. The after-tax arithmetic is on HYSA vs CD vs T-bills, and it is the page to read before shopping for a jumbo certificate in an income-tax state.
Brokered CDs. Certificates bought through a brokerage account, issued by many different banks, are the standard way to place a large sum across institutions without opening a dozen accounts. FDIC coverage passes through to you — but only if the funds are actually yours, the bank's records show the account is held for customers, and the broker's records identify you and your share. The FDIC lists "brokers who offer brokered CDs" as exactly this kind of arrangement. If the conditions are not met, the deposits are insured to the broker, aggregated, and you are a line in its ledger.
Two other things differ. A brokered certificate usually cannot be redeemed early at all; it is sold on a secondary market, and if rates have risen since you bought it, the sale price can be below what you paid. And some are callable: the issuing bank may end the certificate early — typically when rates fall and it can borrow more cheaply — and a "one-year non-callable" label describes the call protection, not the maturity, which may be much longer. The SEC's guidance on certificates has warned about exactly that confusion for years. Know which bank issued the certificate, because the insurance limit applies at that bank, together with anything else you hold there directly.
What negotiation is worth
A large balance is worth asking about. Branch banks and credit unions sometimes have relationship pricing, retention offers or unpublished jumbo tiers that a phone call surfaces and a rate table never will. Ask, and get any answer in writing before you move the money. Do not expect much: the honest range for what asking achieves is the same basis-point premium as above, and the answer is more often about waiving a fee elsewhere than about the certificate rate.
Reading a jumbo offer in five minutes
- The tier threshold, and whether you are above it. Some institutions set the jumbo tier below $100,000; many have none at all. Read the balance column of the rate card before the rate.
- The premium in basis points — against the same institution's standard certificate for the same term, and against the FDIC national rate and the Treasury yield on the hub page.
- The penalty schedule, priced on your actual balance, not on the $10,000 examples every explainer uses. A number of days' interest is a small figure on a small deposit and a large one here.
- Your insured position at that bank after the deposit — every account you hold there, in each ownership category, against $250,000.
- Whether the certificate is direct or brokered, and if brokered, which bank issued it and whether it can be called.
Five minutes, and the third and fourth items are where a six-figure decision is actually made. The rate is the least of it.
What a jumbo certificate is actually for
The same thing any certificate is for: money with a real date. A house purchase with a fixed closing, a tax bill, a planned capital expense, the proceeds of a sale awaiting a decision with a deadline. What changes at this size is only the weight of the two risks above — concentration past the insurance limit, and an exit price that can wipe out years of the premium.
It is not the place for an emergency fund, which needs no date and total availability — where to keep one covers that — and it is not the place for money with a horizon of many years, which should not be earning certificate rates at all.
What to actually do
Count charters, not brands. Before placing more than $250,000 in certificates, check every bank's FDIC certificate number with BankFind. Two brands can be one bank.
Use ownership categories before you use more banks. Joint ownership and named beneficiaries raise the insured amount at a single bank legitimately and with far less admin than a fifth institution. Get the rules from the FDIC, not a comparison site.
Price the penalty before the premium. A tenth of a point on $100,000 is $100 a year; a 90-day penalty is nearly $1,000. If there is any chance the money moves early, the milder penalty is worth more than the higher rate — and a ladder is worth more than either.
Run the Treasury comparison if your state taxes income. At six figures the state exemption alone can exceed the jumbo premium. The arithmetic is short and it is on the comparison page.
If you use brokered certificates, know the issuer and read the call terms. Pass-through insurance depends on the records being right; the call date is not the maturity date; and the exit is a market sale, not a penalty.
Ask, in writing, and expect basis points. A large deposit earns a conversation. It rarely earns a percentage point.
Get the CentSheet Money Brief
Email me CentSheet weekly: practical money decisions, new calculators, and useful worksheets. Unsubscribe anytime.