Here are the tax calculation steps on taxable income as per law:

Pre-Tax Calculation Steps on Taxable Income

1. Gross Income: Calculate total income from all sources (salary, investments, business income, etc.).
2. Deductions: Subtract allowed deductions (standard deduction, itemized deductions, business expenses, etc.).
3. Exemptions: Subtract excluded income (social security benefits, scholarships, etc.).
4. Taxable Income: Calculate gross income minus deductions and exemptions.

Tax Calculation Steps on Taxable Income

1. Tax Rate Application: Apply tax rates to taxable income (federal, state, provincial, or local).
2. Tax Liability: Calculate total tax liability based on tax rates and taxable income.
3. Tax Credits: Apply tax credits (earned income tax credit, child tax credit, education credits, etc.).
4. Net Tax Liability: Calculate total tax liability minus tax credits.

Post-Tax Calculation Steps on Taxable Income

1. Tax Payment: Pay taxes owed by deadline to avoid penalties and interest.
2. Tax Audit: Cooperate with tax audits and provide required documentation.
3. Tax Compliance: Ensure timely filing and payment of taxes.

Tax Calculation Formulas For Taxable Income

1. Tax Liability = Taxable Income x Tax Rate
2. Net Tax Liability = Tax Liability – Tax Credits
3. Total Tax Liability = Net Tax Liability + Penalties + Interest

Relevant Tax Laws and Regulations For Taxable Income

1. Income Tax Ordinance 2001 (Pakistan)
2. Internal Revenue Code (USA)
3. Income Tax Act (Canada)

Tax Authorities For Taxable Income

1. Federal Board of Revenue (FBR) (Pakistan)
2. Internal Revenue Service (IRS) (USA)
3. Canada Revenue Agency (CRA)

Important Deadlines For Taxable Income

1. Tax Filing Deadline: April 15th (USA)
2. Tax Payment Deadline: April 15th (USA)
3. Tax Audit Deadline: Varies by jurisdiction

Consult a tax professional or financial advisor to ensure accurate tax planning and compliance with applicable tax laws.