For a single taxpayer with a combined income of $30,000, will 50% of their Social Security benefits be taxable?

In determining the taxability of Social Security benefits for a single taxpayer, the combined income is a key factor. The combined income is calculated by adding the taxpayer's adjusted gross income (AGI) to any nontaxable interest income and half of their Social Security benefits.

For a single filer, if the combined income is below a certain threshold, typically $25,000, then Social Security benefits are not taxable. However, when the combined income falls between $25,000 and $34,000, up to 50% of Social Security benefits may be subject to taxation. Since the taxpayer in this case has a combined income of $30,000, which is within that range, it indicates that 50% of their Social Security benefits are indeed taxable.

Therefore, the answer is that 50% of their Social Security benefits will be taxable based on the combined income threshold set by the IRS for single filers.