You’re thinking of borrowing with margin loan, but with box spread financing (see my “answer” on that) you can lock in a borrowing rate for up to 3 years, so if you match that with the CD’s maturity you can cancel out the interest rate risk.
Is this still worth it if you’re exceeding the FDIC limit of $250k?
Yes, you can open accounts at multiple banks and use other tricks to get more insurance. See https://smartasset.com/checking-account/how-much-is-fdic-insurance
You’re thinking of borrowing with margin loan, but with box spread financing (see my “answer” on that) you can lock in a borrowing rate for up to 3 years, so if you match that with the CD’s maturity you can cancel out the interest rate risk.
Is this still worth it if you’re exceeding the FDIC limit of $250k?
Yes, you can open accounts at multiple banks and use other tricks to get more insurance. See https://smartasset.com/checking-account/how-much-is-fdic-insurance