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A 100-year CD puts a new spin on long-term investing. Is it a good idea?

Savers may want to lock in high interest rates for the long haul before they likely head lower later this year.

But is 100 years too long?

Concord, New Hampshire-based Walden Mutual Bank is finding out. The financial institution is offering a 100-year Local Impact Certificate of Deposit paying a fixed 4.75% annual interest rate.

The CD is open to anyone with $1,000 and up to $150,000 to invest and is Federal Deposit Insurance Corp. insured up to $250,000. The CD allows people to invest alongside Walden to support local agriculture, specifically lending to food and agriculture businesses in New England and New York, the bank said.

“A five-year CD is common, a 10-year CD is a rarity, and a 100-year CD is one-of-a-kind,” said Mary Grace Roske, spokeswoman at CD rates comparison site CDValet.com. “Walden Mutual has created a unique opportunity for people who want to align their values – environmental responsibility, in this case – and their savings, and it’s a creative spin on socially responsible investing.”

What is the 100-year CD?

Here are the details:

◾ Minimum investment of $1,000 up to $150,000 per individual or organization.

◾ Fixed 4.75% APY for the 100-year life of the CD.

◾ FDIC insurance up to $250,000.

◾ A completed beneficiary form is mandatory at account opening.

◾ You may withdraw your entire deposit at any time by request, subject to a penalty of 10 years' interest. If you withdraw the CD before 10 years, the penalty will reduce the principal value of the CD.

◾ Interest paid can be withdrawn penalty-free at any time, automatically or by request. In approximately 15 years, more than half of your deposit will be interest, which is withdrawable on demand, and penalty-free. For example, if you purchased a CD for $1,000 and withdrew it after 20 years, you would receive $1,942, or an effective interest rate of 3.32%. ◾ Partial withdrawal of principal is not permitted.

◾ It isn’t callable by the bank, meaning only the holder can redeem the bond early.

What is Walden Mutual Bank?

Walden is a mutual savings bank and a certified B-corporation, or a for-profit corporation certified with a social impact. Walden’s focused on serving farms, food businesses, sustainability-related businesses and nonprofit organizations, according to CDValet.com.

It’s a mutual bank, meaning it has no shareholders and it’s owned by its depositors, Walden said.

Walden was founded in 2022 as “an online bank for everyone who eats/makes/grows/cooks/loves local food,” its 2022 annual report said.

Chief executive Charley Cummings combines a business degree with an agricultural background, having started a meat Community Supported Agriculture that allows consumers to buy shares of a farm's harvest in advance.