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What is an add-on CD? A guide to flexible certificates of deposit

Want to grow your savings but need more flexibility than a traditional CD offers? Learn how an add-on CD works, its key benefits, and if it's the right fit for your financial goals.
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Written by John Schmoll
Financial Expert
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Associate Editor
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Reviewed by Jennifer Doss
Managing Editor
Why MoneyRates is your trusted source

A certificate of deposit (CD) is a popular vehicle for Americans to earn interest on spare cash. CDs commonly pay more than a standard savings account, making them a more attractive option for savers who want to hold cash as part of their overall portfolio.

While the predictability of CDs is intriguing for many, there’s one problem: CDs usually don’t allow additional deposits. An add-on CD solves this problem, allowing savers to add more to their account beyond the initial lump sum.

Add-on CD accounts offer additional flexibility, though some features of the savings vehicle may not make them a fitting tool for all savers. Here’s how an add-on CD works and how to determine if it’s a suitable option for your savings.

What is an add-on CD? Key features and benefits

Add-on CDs operate much like traditional CDs. They have a fixed term and maturity date, but there’s one significant twist: an add-on CD allows savers to make additional deposits into the CD over its life. This makes it an attractive alternative for people who may not have a substantial lump sum to save at the outset but plan to have additional funds to save during the CD term.

Traditional CDs, on the other hand, typically only allow for one deposit, and the funds must sit in the account, or else you risk an early withdrawal penalty if you withdraw funds before maturity.

Add-on CDs provide flexibility not found in traditional CDs. Account holders can make an initial deposit and ongoing deposits throughout the term of the CD, making it possible for people who want to automate deposits into the account.

There’s no set rule for how often you can put additional money into add-on CDs. Some banks allow deposits throughout the term, while others allow contributions only for the first 30, 60, or 90 days of the account. This matters as deposits made later in the term will earn interest for fewer days. It’s best to ask what the bank allows before opening the add-on CD.

It’s not uncommon for banks to have minimum deposit requirements for additional contributions, often at least $25, $100, or more per deposit. Depending on the institution, you may also find limitations on when deposits can be made, such as monthly. Add-on CD accounts also typically pay a bit less interest than traditional CDs.

Aside from the features, add-on CDs offer several key benefits. Savers can add money to their CDs during the term at a fixed interest rate. If you’re a disciplined saver and can automate deposits, this may help you seamlessly grow your savings while earning a competitive interest rate. Add-on CDs also include the same Federal Deposit Insurance Corp. (FDIC) or National Credit Union Administration (NCUA) insurance as many other savings products.

These accounts offer much-desired flexibility not found in a traditional CD. However, they still don’t offer the same liquidity as a high-yield savings account.

How does an add-on CD account work?

Opening an add-on CD account is similar to opening any other CD. Start by selecting a term that matches your desired timeline. Keep in mind that the term begins at the account’s opening, not at your final contribution, which is why earlier deposits matter.

There’s no set deposit standard with add-on CDs, so minimum and maximum deposit requirements vary by bank. Some institutions will cap contributions by the amount or frequency of deposits, or by the account balance. It may not seem like it matters much, but it’s important to select an add-on CD that aligns with your goals. Depending on your timeline and circumstances, a CD ladder or high-yield savings account may make more sense for you.

Funding options outside the initial account-opening process vary by bank. Some institutions may allow for automated transfers, while others only allow for manual transfers. If you’re able, automatic transfers can help ensure deposits are consistent.

Interest-earning opportunities are essential to consider when selecting an add-on CD. You may earn a competitive interest rate on the CD, but it’s important to remember that interest is generally calculated on the current principal balance in the CD, and it accrues over time.

Add-on CDs offer flexibility, but the trade-off is that future deposits don’t earn interest until the funds are in the account. In that case, a traditional CD may offer more interest if you’re able to commit to a lump-sum deposit.

For example, if you open a two-year CD earning 3.5% with $2,000, and it compounds monthly, you will earn approximately $144.80 in interest over the term. On the flip side, if you deposit $200 monthly for 10 months, you will typically earn less in interest over the term.

Add-on CDs act similarly to traditional CDs at maturity. You generally have the same grace period to withdraw funds or decide to roll the money into another CD. Additionally, add-on CD accounts restrict early withdrawals, just like traditional CDs. It’s fair to expect you’ll need to sacrifice up to several months of interest if you withdraw funds early.

Can you add money to a certificate of deposit?

Yes, it is possible to add money to a CD in the right circumstances. Traditional CDs do not allow additional deposits once the account is funded. An add-on CD is the only way to accomplish that.

Add-on CD accounts let savers make additional deposits throughout the CD term. Unfortunately, there’s no industry standard for how often you can deposit funds into the add-on CD throughout the term. Some institutions may allow you to deposit funds as often as you wish, while others only allow you to deposit additional funds during a set window.

Despite potential deposit limitations, add-on CDs offer flexibility that can be appealing to the right saver. If you want a fixed interest rate and a low initial deposit requirement, with the ability to add funds during the term, add-on CDs can be an advantageous way to grow savings.

Are add-on CDs good? Pros and cons analysis

Add-on CD accounts can be a helpful tool to grow savings without the rigidity of a traditional CD. They’re not a fit for all savers, though. Here’s what to consider when contemplating an add-on CD.

Benefits of add-on CD accounts

Add-on CDs can be an attractive savings vehicle for various reasons, including:

Flexibility: Can you add money to a CD? It’s only possible with an add-on CD. You can deposit funds during the term, allowing you to establish a long-term savings strategy.

Fixed returns: CDs offer a fixed interest rate. Even if the market drops during your term, you earn your stated fixed rate.

FDIC or NCUA coverage: CDs are generally insured up to $250,000 per depositor, per insured institution, per ownership category.

Ideal for consistent savers: Traditional CDs allow only a one-time lump-sum deposit. Add-on CD accounts let you save throughout the term of the CD. If you’re seeking a way to regularly save and earn a fixed rate, add-on CDs let you build consistency.

Perfect for specific goals: Are you saving for a specific goal, such as a wedding, a down payment on a house, or another significant need? Add-on CDs allow account holders to achieve that goal through consistent saving.

Potential drawbacks of add-on CDs

Despite the flexibility, add-on CD accounts have some drawbacks, such as:

Lower interest rates: You pay for flexibility with typically lower interest rates, compared to traditional CDs. That may hinder your ability to reach your goals.

Early withdrawal penalties apply: CDs typically have penalties if you withdraw cash before maturity. You often give up several months’ worth of interest. That’s no different for add-on CDs.

Minimum deposit requirements: Depending on the institution, you may find that it has minimum deposit requirements for depositing additional funds. If you’re not able to meet those requirements, you may limit interest-earning opportunities.

Not ideal for emergency funds: Add-on CDs may seem like a fitting account option for emergency funds. Thanks to early withdrawal penalties, that’s not the case. It’s wise to consider a high-yield savings account as a better tool for emergency savings.

When to choose an add-on CD: Best case uses

An add-on CD is a niche savings tool that can be helpful in the right situation. Used wisely, it can earn a competitive fixed rate and help you protect your savings. However, a lack of due diligence can cost you in the long run.

Here are some of the best uses for an add-on CD account.

Saving for medium-term goals: It’s important not to overlook medium-term goals in your financial planning. Saving for retirement and short-term needs is important, but reaching medium-term goals, such as those within two to five years, is essential. This may include anything from saving for a wedding to saving for a down payment to building an education fund. In those cases, an add-on CD can be a useful tool.

Expecting intermittent windfalls: Do you receive intermittent influxes of cash, like an annual bonus or tax refund, and desire to grow those funds? An add-on CD gives the flexibility to maximize interest without risking funds in the stock market.

Building savings discipline with flexibility: Is your emergency fund fully funded, and do you want to continue to strengthen your savings muscle? An add-on CD account lets you consistently save funds you don’t need access to immediately.

Hedging against falling interest rates: Interest rates ebb and flow, but add-on CDs have fixed rates. You can use an add-on CD to protect against falling rates.

Bottom line: Are add-on CDs worth it?

CDs can be a helpful part of an overall financial planning strategy. Traditional CDs often have compelling interest rates, but you sacrifice flexibility. Add-on CDs partially solve this problem by offering the ability to add funds throughout the term while still earning a fixed rate. For savers seeking fixed rates and versatility, add-on CD accounts can play a key role in financial planning. Research the best CD rates to identify an attractive account option for your savings needs.

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Financial Expert
John Schmoll is a former stockbroker with an MBA in Finance and more than 12 years of experience in finance and business writing. He’s passionate about helping readers reach their financial goals, whether that’s paying down debt, learning to invest, saving or earning more money. His writing and reviews have been published by GoBankingRates, Investopedia, Prudential, and U.S. News. He also runs the successful personal finance and review site, FrugalRules.com and writes for banks and business clients. He lives in Omaha with his wife and three children.