Updated 20 May 2026
Best 18-Month CD Rates: The Overlooked Sweet Spot (May 2026)
Best rate: 4.05% from BMO Alto
Eighteen-month CDs sit in a gap that most rate shoppers overlook. Fewer banks offer this term, which means less competition and sometimes promotional rates to attract deposits. At 4.05% APY from BMO Alto, the best 18-month rate earns $1,594 on a $25,000 deposit. This term bridges the popular 1-year and 2-year options for savers whose timeline does not fit neatly into either.
Top 8 Banks Ranked by APY
BMO Alto
4.05%
APY
Min Deposit
$0
Early Penalty
6 months interest
Interest on $25K
$1,519
Interest on $50K
$3,038
BMO Alto leads the 18-month category with no minimum deposit. 18-month CDs are less common than 12-month, so the field is thinner.
Bread Financial
4.00%
APY
Min Deposit
$1,500
Early Penalty
6 months interest
Interest on $25K
$1,500
Interest on $50K
$3,000
Bread Financial is consistently near the top across all terms. $1,500 minimum applies.
Barclays
3.95%
APY
Min Deposit
$0
Early Penalty
180 days interest
Interest on $25K
$1,481
Interest on $50K
$2,963
Barclays offers a competitive 18-month rate with no minimum deposit. A solid mid-term option.
Marcus by Goldman Sachs
3.90%
APY
Min Deposit
$500
Early Penalty
270 days interest
Interest on $25K
$1,463
Interest on $50K
$2,925
Marcus 18-month rate is decent. The 270-day penalty is steep for this term length, covering half the CD period.
Ally Bank
3.85%
APY
Min Deposit
$0
Early Penalty
60 days interest
Interest on $25K
$1,444
Interest on $50K
$2,888
Ally keeps its trademark low 60-day penalty even at 18 months. 20 basis points below the leader.
Discover Bank
3.85%
APY
Min Deposit
$2,500
Early Penalty
6 months interest
Interest on $25K
$1,444
Interest on $50K
$2,888
Discover ties Ally on rate. Higher minimum and penalty make Ally the better choice for most savers.
Capital One
3.80%
APY
Min Deposit
$0
Early Penalty
6 months interest
Interest on $25K
$1,425
Interest on $50K
$2,850
Capital One offers a clean 4.00% with no minimum. Straightforward option.
Synchrony Bank
3.75%
APY
Min Deposit
$0
Early Penalty
180 days interest
Interest on $25K
$1,406
Interest on $50K
$2,813
Synchrony trails the leaders by 30 basis points. No minimum deposit.
When Does a 18-Month CD Make Sense?
An 18-month CD makes sense when your timeline is roughly a year and a half: saving for a home purchase closing in late 2027, funding a graduate school semester that starts in 18 months, or bridging the gap between two milestones. It also works well as a middle rung in a longer CD ladder. The 18-month term is underrated because fewer banks actively market it, but those that do often offer rates that are closer to 1-year rates than 2-year rates, giving you extra rate lock for a small rate sacrifice.
How 18-Month Rates Compare to Other Terms
The 18-month rate at 4.05% sits between the 1-year rate (4.20%) and the 2-year rate (3.90%). The 15 basis point step down from 1-year to 18-month is smaller than the 15 basis point step down from 18-month to 2-year, which means the rate curve is steepening at this point. You give up just 0.15% compared to a 1-year CD but gain 6 extra months of rate lock. Whether that trade is worth it depends on your rate outlook: if you believe rates will be significantly lower in 12 months, the extra 6 months of locked 4.05% is valuable insurance.
Early Withdrawal Penalty Analysis
| Bank | Penalty | Penalty on $25K | Net Return if Broken at 50% |
|---|---|---|---|
| BMO Alto | 6 months interest | $499 | $260 |
| Bread Financial | 6 months interest | $493 | $257 |
| Barclays | 180 days interest | $487 | $254 |
| Marcus by Goldman Sachs | 270 days interest | $721 | $10 |
| Ally Bank | 60 days interest | $158 | $564 |
| Discover Bank | 6 months interest | $475 | $247 |
| Capital One | 6 months interest | $468 | $244 |
| Synchrony Bank | 180 days interest | $462 | $241 |
"Net Return if Broken at 50%" shows what you keep if you close the CD halfway through the term. Negative means the penalty exceeds earned interest and eats into principal. Full penalty comparison and calculator
Frequently Asked Questions
Why are there fewer 18-month CD options?▾
Most banks focus on standard terms: 3-month, 6-month, 1-year, 2-year, 3-year, and 5-year. The 18-month term is non-standard, so fewer institutions offer it. Banks that do offer 18-month CDs (BMO Alto, Bread Financial, Barclays) sometimes use them as promotional products to attract new deposits.
Is 18 months too long for a CD?▾
It depends on your timeline. If you are confident you will not need the money for 18 months, this term provides a solid rate lock through late 2027. If your timeline is uncertain, consider a 1-year CD or a no-penalty CD instead. The early withdrawal penalty at 18 months is typically 6 months of interest, which is significant.
How does an 18-month CD compare to a 2-year CD?▾
The 18-month CD currently pays 4.05% versus 3.90% for a 2-year CD. You earn a higher annualized rate with 6 fewer months of lock-up. The only reason to choose 2 years is if you want maximum rate lock duration and believe rates will drop below 3.90% within 18 months.