I cashed 3 of our I bonds in January 2024. We keep them in a lock box at the bank and have 7 more to cash sometime in the future. The interest was $28K on the 3 bonds. Can I wait until 2025 to pay taxes on that and not get a penalty? We've had them since the early 2000s. We bought 10 (10K) over 5 years. Our income will be dividends (ordinary $12K or so and 15K qualified) and about $2500 in consulting income for DH for 2024. I don't want a penalty. We paid estimated taxes for 2023 and 2024 but decided to cash those bonds.