Verified Answer :

To solve this problem, we can go through it step-by-step:

1. Understand the Tax Bracket Limits:
- The 10% tax bracket has been increased to \($9,594. This means that income up to $\)9,594 is taxed at 10%.
- Income above \($9,594 will be taxed at 15%. 2. Given Income: - The taxpayer's income is $\)10,400.

3. Tax Calculation at 10%:
- Income within the 10% bracket: \($9,594 4. Remaining Income: - To find the portion of income that falls into the 15% tax bracket, we subtract the 10% bracket limit from the total income: \( \text{Remaining Income} = \$\)10,400 - \\($9,594 \) 5. Compute the Remaining Income: \( \text{Remaining Income} = \$\)10,400 - \\($9,594 = \$\)806 \)

6. Conclusion:
- The remaining income of \($806 is the portion that will be taxed at 15%. So the answer to the question is: a) $\)806