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The difference between a 3-year and 5-year term on a $20,000 loan at 7% is about $1,400 in total interest—but the monthly payment drops by $140. Same loan, very different cash flow.
Good to know
Auto loans vs personal loans. Auto loans typically have lower rates because the car is collateral. Personal loans are unsecured, so lenders charge more to cover risk. A $25K auto loan at 5% costs about $4,700 less in interest over 5 years than the same amount as a personal loan at 11%. If you can secure the loan, do it.
The real cost of "low monthly payments." Extending the term lowers the payment but increases total interest dramatically. A $15K loan at 8%: 3 years = $470/month, $1,900 total interest. 6 years = $262/month, $3,900 total interest. You pay $8/month less but $2,000 more overall. Monthly payment is cash flow; total interest is the real cost.
Extra payments hit principal directly. After your regular payment, any extra money goes straight to principal. Even $50/month extra on a $20K, 5-year loan at 7% saves about $400 in interest and pays it off 6 months early. The math is boring and effective.
Disclaimers & sources
For reference only. Not financial advice. Actual terms depend on the lender.