For 2016 we earned $108,000 (line 22) after all the adjustments I paid $872.
That's 0.8%, Sorry, If you just gulped!
BTW, we are self employed and have some income as qualified dividends.
Here's a list of the adjustments,
Wrote off $3000 as a capital loss, HSA, $7,650, Deduct 1/2 of SS taxes $5,322,
SEP/IRA $13,982, Self employed insurance deduction $10,070, standard deduction, $12,600,
exemptions, $16,200, and finally a $3003 tax Credit.
Then the one that makes me gulp is the SS tax, I paid $10,622 for both halves of the SS tax.
Most years it's under 3% federal tax.
Edit to add;
I never expected to see $100k on my tax form. Combining our families SS earning records, I see out of 36 yrs married, we have 14 yrs under $30k and 21 yrs under $50k.
My wife started a side hustle 16 years ago and it became our full time job, with a nice income bump.