Calculate estimated federal tax liability and payments.

Determine Alternative Minimum Tax liability and exemption thresholds.

Estimate net business income, self-employment tax, and deductions.

Find the taxable portion of Social Security income based on provisional income.

Analyze the tax impact of retroactive lump-sum Social Security payments.

Calculate Required Minimum Distributions from retirement accounts.

Determine eligibility and amounts for extra standard deductions for seniors.

Compute California Franchise Tax Board tax liability and payments.

Look up local sales tax rates across California districts.

Calculate deductible sales tax for itemized deductions.

Determine if your previous year's state refund is taxable federally.

Calculate age for age related tax milestones.

Perform quick, basic arithmetic calculations alongside your forms.