Before buying a car in 2025, track these three key numbers: your credit score, total cost of ownership (TCO), and monthly payment vs. income ratio. Your credit score determines loan interest rates; a higher score saves thousands. TCO includes insurance, maintenance, fuel, depreciation, and taxes—often exceeding the purchase price. Experts recommend keeping car expenses under 15% of your monthly take-home pay. Also, consider loan terms: a shorter term saves interest but raises payments. Finally, factor in down payment (at least 20% is ideal) and current market trends like EV incentives or used car prices. Smart planning ensures you don’t overpay or strain your budget.