What if I have $25,000 in a Go Savings account – does the entire balance earn the rate for the $25,000 tier?

No. The first $2,499.99 earns the rate in the first tier, the next $2,500-$4,999.99 earns the rate in the second tier, and so on. When interest is paid to the account, the total interest amount is a combination of the amount earned in each tier. Example! If your balance is $25,000, it earns interest like this: $2,499.99 earns 1.98%, the next $2,499.99 earns 0.75% and the remaining $20,000.02 earns 0.25%.