I once added $6 in interest and the tax went up $12! It pushed me into the next tax bracket. I was right at the line. Here is the 2023 tax table. Look at how much the tax increases for each $50 of income. Like if you are at 42,049 and only added $1 to 42,050 the tax goes up $6.
https://www.irs.gov/pub/irs-pdf/i1040tt.pdf
