You can't directly add money to an existing Capital One CD account. Once you open a CD, the funds are locked in for the term you choose, and you can't add to it.
To increase your investment, you have a few options:
- Open a new CD: You can open a new CD with the desired amount, alongside your existing CD.
- Transfer funds: You can transfer funds from another Capital One account, like a checking or savings account, to a new CD.
- Rollover: At the end of your existing CD term, you can roll over the matured funds into a new CD with a different term or interest rate.
Remember, adding money to an existing CD is not possible. However, you can utilize the options mentioned above to increase your investment.