Installment is like a knife — it cuts bread and cuts hands. The difference is not in the knife; it is in the hands that hold it. Here are clear criteria to know when installment is a smart decision and when it is a financial trap that could damage the years ahead. Rule One: Finance What Produces, Not What Consumes A productive product generates income or saves cost. A laptop for a graphic designer is productive; a luxury phone for a teenager is not. A car for someone who commutes long distances is productive; a designer watch for social display is not. A simple test: ask yourself, "Will this product help me earn more or spend less over the next year?" If yes, installment is justified. If no, walk away. Rule Two: Your Total Installments Should Not Exceed 35% of Your Income This is not an opinion — it is a global financial standard. Anyone who crosses 35% of their monthly income in installment commitments enters a financial danger zone. Any unexpected pressure — illness, job loss, family emergency — will push them from debtor to defaulter. Calculate honestly: your net salary plus any stable additional income equals your income. All installment obligations combined (car, devices, real estate, credit cards) equals your commitments. The ratio must not exceed 0.35. Rule Three: Never Finance Longer Than the Product's Useful Life A phone used for 3 years should never be financed over 4. You would be paying for something you no longer own. General rule: repayment period ≤ expected product lifespan. This rule alone prevents 40% of bad debt in Saudi Arabia. People finance over periods that exceed the product's useful life and enter a replacement cycle before paying off the old item. Rule Four: Calculate the Total Cost, Not the Monthly Payment The monthly payment is a psychological trick. "500 SAR per month" sounds cheap. But 500 × 36 months = 18,000 SAR on a product with a cash price of 15,000. Did you save 3,000 SAR over three years? Usually not — you spent an extra 3,000. Always ask for the cash price and the total installment price before signing. If the difference is steep (more than 25% over one year), negotiate or find another company. When Is Installment a Trap? Trap One: Financing for social appearances. A luxury car for the image, a phone for parties, a watch for photos. These debts eat you from the inside and add no real value. Trap Two: Stacking installments from multiple sources. A customer financing from Company A, Company B, a credit card, and a bank loan — each obligation is manageable alone, but together they are lethal. Trap Three: Taking new financing to cover old installments. This is the most dangerous form, called "revolving debt." You take new financing to pay an old installment, entering an endless loop. The Bottom Line Installment is not your enemy. It is a legitimate financial tool that serves millions of Saudis every month. But like any tool, it requires knowledge before use. Always ask yourself: why am I financing this specific thing? What is the alternative? Can I handle the worst case? If you answer confidently, you are using installment wisely.