What exactly is taxable income and how is it different from my gross pay?

Gross pay is everything you earn before anything is removed. Taxable income is what is left after you subtract pre-tax deductions like 401(k) and HSA contributions, then subtract either the standard deduction or your itemized deductions. The IRS applies the tax brackets to this final taxable income number, not to your gross salary, which is why your actual tax bill is usually much lower than a bracket applied to your whole paycheck. The path runs gross income, then adjustments to reach adjusted gross income (AGI), then deductions to reach taxable income. Understanding this order helps you see why pre-tax contributions are so powerful: they shrink the number the brackets apply to. The Tax Health assessment at wealthserene.com/assessments/tax-health can walk you through where your income lands.