Smart Money Rules: 8 Rules to Check Before You Buy

Short answer: Use a simple rule before every big money decision. For a car, pay 20% down, repay within 4 years, and keep all car costs near 10% of income. Keep total loan EMIs near 35–40% of take-home pay. Pay credit cards in full. Spread your investments. Start retirement saving early. Key Facts The 20/4/10