Best 18-Month CD Rates 2026: Top APYs and Ladder Fit — August 2026

Key Takeaways

An 18-month CD sits between the two most commonly advertised terms (1-year and 2-year) and usually pays close to both — pick it for the timeline fit, not a rate advantage.
At 4.15% APY, $10,000 in an 18-month CD earns about $623 over the term, versus roughly $225 at the national average.
The early-withdrawal penalty typically jumps to around 180 days of interest at this term length, a real step up from the 60-to-90-day penalties common on 6-month CDs.

Quick answer

An 18-month CD makes sense when your goal date genuinely lands 15 to 21 months out — close enough to a year that a 1-year CD matures too early, but not far enough out to justify a full 2-year lock. If your timeline is a cleaner match for 12 or 24 months, use that term instead; the rate difference at 18 months usually isn't large enough to chase on its own.

The full picture

As of today, Merrick Bank's 18-month CD is paying … APY. Eighteen-month CDs occupy an unusual spot in most banks' rate sheets: they are advertised less prominently than the 1-year and 2-year terms, so it's worth specifically checking the 18-month rate rather than assuming it splits the difference evenly between the two. Sometimes it does. Sometimes a bank prices the 18-month term aggressively to attract deposits into a specific maturity bucket, and it briefly beats both neighboring terms.

The term's real value is precision. If you know a specific expense is coming in a year and a half — a tuition payment, a planned renovation, the tail end of a multi-year savings goal — an 18-month CD locks your rate for exactly that window instead of forcing you to choose between maturing too early (1 year) or holding longer than necessary (2 years).

Quick picks

Best 18-month CD overall

Pick: Merrick Bank
Why: Competitive APY, genuine live rate for this term

Highest APY

Pick: Bread Savings
Why: Frequently leads this specific term

Also worth checking

Pick: Synchrony Bank
Why: Consistently near the top of the 18-month tier

Ladder building

Pick: Merrick or Bread
Why: Multiple terms, easy renewal management

Best for	Pick	Why
Best 18-month CD overall	Merrick Bank	Competitive APY, genuine live rate for this term
Highest APY	Bread Savings	Frequently leads this specific term
Also worth checking	Synchrony Bank	Consistently near the top of the 18-month tier
Ladder building	Merrick or Bread	Multiple terms, easy renewal management

Rates updated from provider disclosures. Verify current terms before opening.

What $10,000 earns over 18 months

Dollar impact: $10,000 for 18 months

At 4.15% APY (top online bank): $10,000 x 4.15% x 1.5 = approximately $623 total interest

At 1.50% APY (national average): $10,000 x 1.50% x 1.5 = approximately $225 total interest

At 0.01% APY (typical big-bank savings): $10,000 x 0.01% x 1.5 = approximately $1.50 total interest

Gap between top CD and national average: $398 over 18 months. Gap between top CD and big-bank savings: $621.50 over 18 months.

All figures are illustrative. Verify current APYs with each institution.

Run your own numbers with our CD calculator.

18-month CD vs the terms on either side

Typical rate today

1-year CD: 4.50% APY
18-month CD: … APY
2-year CD: 4.50% APY

Lockup

1-year CD: 12 months
18-month CD: 18 months
2-year CD: 24 months

Typical penalty

1-year CD: 150-180 days interest
18-month CD: ~180 days interest
2-year CD: ~180-270 days interest

Best fit

1-year CD: Goal 9-15 months out
18-month CD: Goal 15-21 months out
2-year CD: Goal 21+ months out

	1-year CD	18-month CD	2-year CD
Typical rate today	4.50% APY	… APY	4.50% APY
Lockup	12 months	18 months	24 months
Typical penalty	150-180 days interest	~180 days interest	~180-270 days interest
Best fit	Goal 9-15 months out	Goal 15-21 months out	Goal 21+ months out

If two of these three rates are within a few basis points of each other — which is common in today's relatively flat rate environment — pick the term that matches your actual timeline rather than the one with the marginally higher APY.

Watch Out: Don't chase a fractionally higher rate into a longer lockup than you need. A 0.10-point APY edge on a 2-year CD is rarely worth six extra months of early-withdrawal risk if your real goal is 18 months out.

Choose X if

Choose an 18-month CD if your goal date is specifically 15 to 21 months away and you want the closest term match available.
Choose a 1-year CD if your goal is closer to 12 months, or you'd rather re-evaluate rates sooner.
Choose a 2-year CD if your goal is closer to 24 months and the 2-year rate is meaningfully higher.
Choose a HYSA if your timeline is genuinely uncertain.

When this recommendation changes

When the answer flips

If the Fed is expected to cut rates over the next 18 months: Locking the 18-month rate now protects you from those cuts filtering into savings and shorter-CD rates. The longer the expected cutting path, the more a mid-length lock like this one is worth.

If the 2-year rate is meaningfully higher than the 18-month rate: Consider whether you'd accept 6 extra months of lockup for the higher APY, especially if your goal date has some flexibility.

If your goal date shifts earlier: Compare the cost of breaking the CD early (about 180 days of interest) against simply waiting for maturity. Our CD early-withdrawal guide has the framework.

How we ranked

We ranked 18-month CDs on APY, minimum deposit, early-withdrawal penalty structure, and FDIC or NCUA insurance coverage. Affiliate relationships do not affect rankings.

SwitchWize earns referral fees from some linked accounts. Rates and terms change frequently; verify with each institution before opening.

Sources

What to do next

What to Do Now

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Frequently Asked Questions

What is the best 18-month CD rate right now?

Top online banks are typically offering 18-month CD rates within a few tenths of a point of their 1-year and 2-year rates — commonly in the 4.00% to 4.30% APY range. Because the term sits between two more commonly advertised terms, it is worth specifically checking rather than assuming it matches the 1-year rate.

Is an 18-month CD better than a 1-year CD?

Rarely by much on rate alone. The real question is your timeline. If your goal is 15 to 21 months out, the 18-month term matches it more precisely than a 1-year CD (which matures too early) or a 2-year CD (which locks longer than needed). If your goal is closer to 12 months, the 1-year CD is simpler and usually pays about the same.

What is the early withdrawal penalty on an 18-month CD?

Most banks charge around 180 days (six months) of interest for early withdrawal on an 18-month CD, a step up from the 60-to-180-day range typical on 6-to-12-month terms. On a $10,000 CD at 4.15% APY, 180 days of interest is roughly $205 — enough to meaningfully cut into a short hold's gains.

Should an 18-month CD be part of a CD ladder?

It can be a useful rung between the 12-month and 24-month steps, giving you a maturity every six months instead of every twelve. Most simple ladders skip it in favor of round-number terms (6, 12, 18, 24), but the 18-month rung specifically fills a semiannual maturity schedule if that cadence matters to you.

How much does an 18-month CD earn on $10,000?

At 4.15% APY, $10,000 in an 18-month CD earns approximately $623 over the full 18 months. At the national average of roughly 1.50% APY, the same deposit earns about $225. The gap is about $398 over a year and a half on a single $10,000 deposit.

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