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Finance, investment, and planning calculations — explained and demystified.
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Why Minimum Credit Card Payments Take 30 Years — DTI Ratio, the Debt Spiral Condition, and Scenario Analysis
FIRE and Reverse Budgeting: How to Calculate the Monthly Savings Rate You Need
The FIRE movement works backwards from retirement: annual income needed ÷ 4% = the portfolio target. Here's the reverse budgeting process, the savings rate vs timeline table (50% savings rate = FIRE in 17 years), CoastFIRE calculations, and why savings rate matters more than income level.
Inflation Winners and Losers: Who Benefits and Who Loses When Prices Rise
Inflation transfers wealth from cash savers and fixed-income investors to fixed-rate debtors and real asset holders. Here's who benefits from inflation (property owners with fixed mortgages, governments with large debt), who loses (cash savers, bond holders, fixed-income retirees), and why these dynamics matter for portfolio construction.
The FD Ladder Strategy: How Staggered Maturities Give You Liquidity Without Sacrificing Returns
Putting all your savings in one long-term FD leaves you with no liquidity. Laddering — splitting across multiple FDs with staggered maturities — gives you annual access to a portion of your savings without penalties, while earning similar total returns. Here's how to set up a 3-rung and 5-rung ladder.
Day-Count Conventions: How Banks Calculate Days for Interest and Why Fiscal Years Differ
Banks use different day-count conventions (Actual/365, Actual/360, 30/360) that produce different interest amounts on the same deposit. Here's how these conventions work, why fiscal years differ by country, ISO 8601 week numbering, and the business days vs calendar days distinction in contracts.
How Banks Calculate RD Interest: The Quarterly Compounding Formula You Can Verify Yourself
Banks use quarterly compounding for most RD products — here's the exact formula to verify your maturity amount independently. Includes monthly vs quarterly compounding comparison, effective annual rate conversion, and how premature withdrawal penalties are calculated.
Microfinance, Grameen Bank, and Mobile Money: How Simple Interest Shapes Credit in Emerging Markets
Before Grameen Bank, banks assumed poor people couldn't repay debt. Group lending with social collateral proved them wrong. Here's how the Grameen model works, why microfinance rates look high but are often justified, how M-Pesa digital credit transformed Kenya, and the debt trap problem in over-indebted markets.
Business Finance Structures: Asset Finance, Invoice Factoring, and EBITDA-Based Lending
Businesses access finance structures that individuals can't: hire purchase vs operating lease for assets, invoice discounting to unlock cash from unpaid invoices, revolving credit facilities vs overdrafts, and EBITDA-based leverage ratios that determine how much a business can borrow.
Tax-Efficient Investing: How ISA, Roth IRA, and ELSS Wrappers Multiply Your SIP Returns
The same SIP grows to the same gross value in or outside a tax wrapper — but after UK ISA, US Roth IRA, or Indian ELSS tax efficiency, you keep far more. Here's the mathematics of tax drag over 30 years, how each country's key tax wrappers work, and why maximising wrappers before taxable investing is foundational.
UK Pension vs US 401(k) vs Australian Superannuation: How Different Retirement Systems Work
The UK State Pension provides ~£11,500/year, US Social Security ~$22,800/year, and Australian super mandates 11.5% employer contributions. Here's how each system works, what the state provides vs what you must build yourself, and what the funding gap means for your personal savings obligation.
Statistics in the News: Why Relative Risk, Poll Margins of Error, and Chart Scales Often Mislead
A "50% reduction in heart attack risk" sounds dramatic; the absolute change might be 1 percentage point. A poll lead of 2% within a ±3% margin of error isn't a lead at all. Here's how relative vs absolute risk misleads in health news, what poll margins of error actually mean, and how to spot misleading charts.
Percentages in Everyday Finance: VAT Calculations, Markup vs Margin, and the Common Mistakes That Cost Money
Percentage and percentage point are not the same thing — a rate moving from 4% to 6% is a 2-percentage-point rise OR a 50% increase. Here's this distinction, the correct way to remove VAT from a price, the markup vs margin confusion that costs businesses, and why a 50% loss requires a 100% gain to recover.
Debt Consolidation: When It Saves Money, When It Backfires, and the Alternatives
Debt consolidation saves thousands when it works — and doubles your debt when it doesn't. The math is sound; the behaviour is the problem. Here's when consolidation genuinely saves money, the most common failure mode (rebuilding original debts), debt avalanche vs snowball alternatives, and how 0% balance transfer cards offer free consolidation.
