trading in a financed used car after 1 year for a another used car that's slightly cheaper. What am I missing?

Posted by VinnieIDC@reddit | Autos | View on Reddit | 8 comments

Let's say I finance a car for $16,000, after 12 month of payments $4,000 is paid off.

My remaining debt would be $12,000

Trade in value $10,000 (1 year later), $2,000 of unpaid debt.

And then I buy another car that costs $14,000, subtract $10,000 (trade in) on the next car, $4,000 + $2,000 = $6,000 unpaid debt on the other financed vehicle. What am I missing? I know about interest rates and stuff, these are just rough estimates.