see this link
https://thefinancebuff.com/overpay-taxes-buy-i-bonds-better-than-tips.html#htoc-maximum-5-000-per-ta...
from this website Treasury Direct
https://www.treasurydirect.gov/indiv/research/faq/faq_irstaxfeature.htm
seems $5,000 is the max using your refund unless you file separately.
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