Computing Gross Income and Net Pay | Grade 11 General Mathematics | Term 1

Computing Gross Income and Net Pay | Grade 11 General Mathematics | Term 1

Understanding Gross Income and Net Pay

Definition of Gross Income

  • Gross income is defined as the total earnings before any deductions are made, including base salary, overtime, commission, and piece work pay.
  • It represents the total amount earned by an individual prior to any subtractions for taxes or other deductions.

Calculation of Net Pay

  • Net pay, also known as take-home pay, is the amount left after all deductions have been subtracted from gross income.
  • The formula for calculating net pay is: Net Pay = Gross Income - Total Deductions.

Common Deductions in the Philippines

  • Deductions include amounts subtracted from gross pay by law or agreement; common examples are:
  • Social Security System (SSS)
  • Government Service Insurance System (GSIS)
  • Pag-ibig Fund
  • Phil Health
  • Withholding tax
  • Loan payments and other company-specific charges such as union dues.

Breakdown of Specific Deductions

Social Security System (SSS)

  • Applicable to private sector employees with a deduction rate of 5% of monthly salary, capped at Php1,350. This covers retirement benefits and disability among others.

Government Service Insurance System (GSIS)

  • For government employees with a deduction rate of 9% on their monthly salary rounded to the nearest peso; it provides life insurance and retirement benefits.

Pag-ibig Fund

  • A fund applicable to all employees that supports housing loans and savings with a deduction rate of 2%, capped at Php200 per month if exceeding this amount.

Health Coverage through Phil Health

Phil Health Contributions

  • Phil Health contributions are mandatory for all employees providing health care benefits; the employee's share is 2.5% of their salary up to a ceiling of Php100,000 per month shared equally with employers.

Understanding Withholding Tax

Withholding Tax Overview

  • This tax applies to all employees based on their annual income; those earning less than Php250,000 annually are exempt from withholding tax under current regulations (Train Law). The rates increase progressively based on income brackets above this threshold.

Example Calculations for Net Pay

Problem Solving: Hazel's Case Study

  • Hazel earns Php550 daily for 22 days resulting in a gross income calculation: Php550 x 22 = Php12,100.
  • After computing her deductions including SSS (Php605), Phil Health (Php302.50), Pag-Ibig (Php200), and no withholding tax due to her annual income being below exemption limits, her total deductions sum up to Php1,107.50 leading to a net pay calculation: Php12,100 - Php1,107.50 = Php10,992.50.

Problem Solving: Jeff's Earnings Analysis

  • Jeff earns Php75 per hour working regular hours plus overtime; his gross income totals Php12,937.50 after accounting for both regular hours and overtime.
  • His deductions similarly lead him to a net pay calculation resulting in Php11,837.50, again demonstrating how various factors influence final take-home amounts based on specific earnings structures and applicable laws like Train Law exemptions for lower incomes.)

Advanced Case Study: Miss Gomez's Salary Breakdown

Detailed Calculation Steps

  • Miss Gomez has a monthly salary plus non-taxable allowances totaling her gross income at Php73,511.

Deductions Breakdown:

  1. GSIS contribution calculated at 9% results in approximately Php6,435.99.
  1. Phil Health contribution calculated at 2.5% leads to about Php1,787.
  1. Pag-Ibig remains capped at Php200 due to her high salary level.

Final Tax Computation:

Her annual taxable income places her within higher brackets necessitating detailed calculations leading up to an effective monthly withholding tax around Php9,75275, culminating in total deductions reaching approximately Php23,17652, thus yielding a final net pay figure around Php503348 after subtracting these comprehensive costs from her gross earnings.)


This structured summary encapsulates key concepts regarding gross income computation while illustrating practical applications through example problems relevant within Philippine taxation frameworks.

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