It is tax season; If you are getting refund, you can invest upto $5000 on buying i-bonds

In any single calendar year, you can buy up to a total of $5,000 of paper I bonds using your refund. You buy I bonds at face value, meaning if you pay $50 (using your refund), you receive a $50 savings bond.

https://www.treasurydirect.gov/research-center/articles/faq-irs-tax-feature/