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Financial & Practical Calculation Guides

In-depth explanations, real mathematical walkthroughs, and practical guides to help you make informed decisions about mortgages, taxes, investments, and health.

Salary & Tax5 min read

HRA Exemption Explained: How to Calculate It and Save Tax

Under Section 10(13A) and Rule 2A, your exempt HRA is the lowest of three statutory amounts: actual HRA received, 50% of basic salary in metro cities (40% in non-metros), or actual rent paid minus 10% of basic. For an employee with ₹50,000 monthly basic receiving ₹25,000 HRA and paying ₹20,000 rent in a metro, exempt HRA is ₹15,000 monthly (₹1,80,000/year). Assuming the top 30% tax slab (+ 4% cess), this saves ₹56,160 in tax, or ₹37,440 in the 20% slab.

2026-09-20
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Salary & Tax5 min read

CTC vs In-Hand Salary: Why Your Take-Home Is Lower

A ₹12,00,000 annual CTC (Cost to Company) does not mean ₹1,00,000 credited to your bank account monthly. After deducting employer PF (₹4800/mo), gratuity provisions (₹1924/mo), employee PF (₹4800/mo), and professional tax (₹200/mo), your pre-tax monthly take-home is ₹88276. Under the New Tax Regime (FY 2026-27) with the ₹75000 standard deduction, income tax TDS is ~₹4909/mo, leaving ₹83367 net in hand.

2026-09-22
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Salary & Tax4 min read

Gratuity Rules: Who Gets It and How It's Calculated

Gratuity is a statutory lump-sum reward paid to employees who complete 5 years of continuous service with an organization. Calculated as (15 × Last Drawn Basic + DA × Completed Years) / 26, an employee with ₹60,000 basic salary and 8 years of tenure receives ₹2,76,923, which is 100% tax-free under Section 10(10).

2026-09-24
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Salary & Tax4 min read

How EPF Works: Contributions, Interest and Withdrawal

The Employees' Provident Fund (EPF) deducts 12% of your Basic Salary + DA every month, matched by a 12% employer contribution (split into 8.33% EPS pension capped at ₹1250 and 3.67% EPF). The accumulated balance earns 8.25% annual interest for FY 2026-27, compounding monthly and credited annually.

2026-09-26
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Investments5 min read

PPF Explained: Rules, Interest and Is It Worth It?

The Public Provident Fund (PPF) is a 15-year sovereign-backed savings scheme with complete EEE (Exempt-Exempt-Exempt) tax status. The interest rate is set by the government every quarter; the current rate is 7.1%. Depositing the maximum ₹150000 every year results in a 100% tax-free maturity corpus of ₹40,68,209.

2026-09-28
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Investments4 min read

NPS for Beginners: How Much Pension Will You Get?

The National Pension System (NPS) is a government-regulated market-linked pension scheme. Investing ₹10,000 monthly from age 35 to 60 at an assumed 10% annual return builds an estimated corpus of ₹1,33,78,903. At age 60, you withdraw 60% (₹80.27 Lakh) tax-free, while the remaining 40% (₹53.51 Lakh) buys an annuity delivering a monthly pension. Exit rules can change; check the latest PFRDA guidelines.

2026-09-30
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Salary & Tax5 min read

TDS Explained: Rates, Sections and How to Claim It Back

Tax Deducted at Source (TDS) is an advance tax withholding mechanism where payers deduct tax before disbursing payments like salary, FD interest, or rent. Common statutory thresholds include ₹40000 for bank FD interest (Section 194A) and ₹240000 for annual rent (Section 194I). If excess TDS is deducted, you can claim a refund by filing your annual ITR.

2026-10-02
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Finance4 min read

Should You Prepay Your Home Loan? A Worked Example

Making early principal prepayments on a long-term home loan cuts compound interest. On a ₹40,00,000 loan at 8.75% for 20 years, a single lump-sum prepayment of ₹3,00,000 at the end of Year 3 saves ₹866484 in interest and closes your mortgage 33 months early.

2026-10-04
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Investments4 min read

EPF vs PPF vs NPS: Which Retirement Option Suits You?

EPF (8.25% interest for FY 2026-27), PPF (the interest rate is set by the government every quarter; the current rate is 7.1%), and NPS (market-linked return with 60% tax-free lump sum and mandatory 40% annuity) serve distinct financial goals. Exit rules can change; check the latest PFRDA guidelines.

2026-10-06
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Salary & Tax3 min read

How to Read Your Salary Slip Line by Line

A monthly salary slip is divided into two distinct columns: Earnings (Basic Salary, HRA, Special Allowance) and Deductions (Employee Provident Fund, Professional Tax, Income Tax TDS). Understanding each line item ensures you catch payroll calculation errors and claim all eligible tax exemptions.

2026-10-08
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Students4 min read

How to Calculate CGPA from SGPA (Step by Step)

Under the Choice Based Credit System (CBCS), Cumulative Grade Point Average (CGPA) is calculated as the sum of (SGPA × Semester Credits) divided by total credits. For equal credit semesters or when credit weights are omitted, CGPA equals the simple arithmetic average of all semester SGPAs.

2026-09-24
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