There are no tax implications to withdrawing money from a Roth IRA. I never thought about it before, but yes, that’s a good idea! You can only purchase $10,000 of I-bonds each year. So start now — and all that money will grow tax-deferred until you cash them in. And you’ll get 9.2% for 6 months, then whatever rate is set in November for the following 6 months. Seems like a good switch to me!