Unless you have significantly more income than the $20,000 you mentioned, I also find a tax rate of 45%-61% high.
You mentioned "Blended tax rate".
I have not seen that term before. How are you calculating it or where are you seeing it - how is it calculated?
To ensure you have not made a gross error, I suggest the following:
For federal, take you total taxes (Form 1040, line 24) and divide it by your taxable income (Form 1040, line 15) . This would give you an average tax rate for your federal taxes.
Form 1040 is available here: https://www.irs.gov/pub/irs-pdf/f1040.pdf
Then do the same for each state and see if each of those rates make sense to you.
The following site gives you a point of reference for what reasonable rates look like, by state
https://www.nerdwallet.com/article/taxes/state-income-tax-rates
If the above results are not reasonable, double check each state to ensure you are not double paying multiple states taxes on the same earned money. (unless so required).
I hope this helps.
