At what income level does up to 85% of Social Security benefits become taxable for a Single filer?

For a single filer, the taxation of Social Security benefits depends on the taxpayer's combined income, which is calculated by adding the adjusted gross income, any tax-exempt interest, and half of the Social Security benefits.

When combined income exceeds $34,000, up to 85% of Social Security benefits may become taxable. Specifically, if the combined income is between $34,000 and $44,000, up to 50% of benefits are taxable, and if it exceeds $44,000, up to 85% could be subject to taxation.

Therefore, the correct answer reflects the income bracket of $34,001 and above where significant portions of Social Security benefits can be taxed, making understanding the implications of combined income critical for tax planning and filing.