🟢 And What That Money Could Do Instead
Buying a car is one of the biggest financial decisions most people make. But very few calculate the real cost of buying a car — beyond the monthly payment.
This article breaks down the true cost of car ownership using real numbers, and shows what happens if you invest the same money instead. The difference may surprise you.
The Example: A New Car at ฿800,000
Let’s use a realistic scenario that many young professionals face.
You want to buy a new car — a popular model like a Toyota Yaris Ativ or Honda City — priced at ฿800,000.
You make a 20% down payment (฿160,000) and finance the remaining ฿640,000 over 5 years at 6% effective interest — a rate commonly offered by banks for new car hire purchase loans with good credit.
What You Actually Pay for the Car
Your monthly loan payment over 5 years: approximately ฿12,300.
But the cost does not end with the monthly payment. Here is what the car truly costs over five years:
Purchase price ฿800,000
Down payment ฿160,000
Total loan repayments (60 × ฿12,300) ฿740,000
Interest paid over 5 years ฿100,000
Insurance (Class 1, ฿20,000/year × 5) ฿100,000
Road tax + registration (est. ฿3,000/yr) ฿15,000
Fuel (15,000 km/yr, 14 km/L, ฿35/L) ฿188,000
Maintenance & repairs (est.) ฿80,000
Total cost of ownership over 5 years ฿1,283,000That is not a typo. A car with an ฿800,000 price tag actually costs you approximately ฿1,283,000 over five years — and that is before we talk about what happens to the car’s value.
Cars Lose Value Fast
A new car typically loses 15–20% of its value in the first year alone, and around 40–50% after five years. Toyota and Honda hold their value better than average, but depreciation is unavoidable.
Your ฿800,000 car after 5 years: approximately ฿400,000–480,000.
Let’s use ฿440,000 as a realistic resale value.
Total spent on the car over 5 years: ฿1,283,000
Resale value after 5 years: ฿440,000
Net cost (what you lost): ฿843,000You spent ฿1,283,000 in total. You got ฿440,000 back. Nearly ฿850,000 is gone — spent on something that lost almost half its value.
The Alternative: What If You Invested That Money Instead?
Now imagine you did not buy the car. Instead, you invested the same amounts you would have spent:
Down payment (invested once): ฿160,000
Monthly car + running costs (invested): ฿18,700At a conservative 6% annual return (a common long-term assumption for a diversified portfolio), here is what happens:
After 5 years:
Total invested: ฿1,283,000
Portfolio value at 6% return: ฿1,514,000
Growth from returns: ฿231,000Instead of a 5-year-old car worth ฿440,000, you have an investment portfolio worth approximately ฿1,514,000.
The difference: ฿1,514,000 vs. ฿440,000 — that is more than ฿1,000,000 apart.
The 25-Year View: Where It Gets Serious
The 5-year comparison is already striking. But the real power of this decision shows over a longer time horizon — because compound interest keeps growing.
The car path over 25 years:
Most people replace their car every 5–7 years. Assuming five car cycles over 25 years at the same cost level (conservative — car prices, fuel, and insurance tend to rise over time):
Total spent on cars over 25 years: ฿6,415,000
Total resale value (5 × ฿440,000): ฿2,200,000
Net cost (what you lost): ฿4,215,000More than ฿4.2 million — gone to depreciation, interest, fuel, insurance, and maintenance. And at the end: one used car.
The investment path over 25 years:
The same ฿18,700 per month invested at 6%:
Total invested over 25 years: ฿5,770,000
Portfolio value at 6% return: ฿13,334,000
Growth from returns: ฿7,564,000One path leaves you with a used car worth ฿440,000 and ฿4.2 million less in your pocket. The other leaves you with a portfolio worth more than ฿13 million.
A note on the 25-year projection: we used the same car cost throughout for simplicity. In reality, car prices, fuel, and insurance tend to rise over time — which means the actual car cost over 25 years would likely be higher, not lower. The investment return of 6% is a long-term average assumption; actual returns will vary year to year.
This Is Not About Never Buying a Car
This article is not telling you to never buy a car. For many people, a car is a practical necessity — for work, for family, or for living in areas where public transport is limited.
The point is to make the true cost visible. We want to show the difference between what a car really costs over time and what becomes possible if you invest the same money instead. Because that difference is far larger than most people expect.
It does not end with the monthly payment — insurance, fuel, maintenance, depreciation, and the opportunity cost of what that money could have become all add up quietly. Once you see the full picture, you can make a more informed decision — whether that means buying a cheaper car, keeping it longer, saving up to avoid financing, or choosing to invest part of the money instead.
What You Can Do With This Knowledge
If you are considering buying a car, run these numbers with your own situation:
Use our Compound Interest Calculator to see how much your monthly car budget could grow over time if invested. Even investing half of a planned car payment while using the other half for a more affordable vehicle can make a meaningful difference over 10 or 20 years.
A few practical alternatives worth considering:
Buy used instead of new. A 2–3 year old Toyota or Honda has already absorbed the steepest depreciation but still has years of reliable use ahead. You save 30–40% on the purchase price and significantly reduce your total cost of ownership.
Save up and avoid financing. If you can wait 2–3 years and invest your planned monthly payment instead, you may be able to buy the car in cash — eliminating ฿100,000+ in interest payments entirely.
Keep your car longer. The most expensive years of car ownership are the first three (steepest depreciation). Keeping a car for 7–10 years instead of replacing it every 5 significantly reduces your average annual cost.
Key Takeaways
- A car with an ฿800,000 price tag actually costs approximately ฿1,283,000 over 5 years when you include financing, insurance, fuel, and maintenance
- After 5 years, that car is worth roughly ฿440,000 — nearly ฿850,000 is gone
- The same money invested at 6% annual return would have grown to approximately ฿1,514,000
- Over 25 years, the car path costs more than ฿4.2 million in net losses — the investment path grows to more than ฿13 million
- This does not mean never buy a car — it means understand the full cost before you decide
Frequently Asked Questions
Are these numbers realistic?
Yes. The car price (฿800,000) reflects popular models like the Toyota Yaris Ativ or Honda City. The interest rate (6% effective) is within the typical hire purchase range of 4–10%. Fuel costs are based on Gasohol 95 at approximately ฿35 per liter. Insurance, maintenance, and depreciation are based on published industry averages. Individual costs will vary — use these as a realistic starting point.
Does this calculation account for inflation?
No. Both the car costs and the investment returns are in nominal terms. In reality, car prices, fuel, and insurance tend to rise over time — which makes the 25-year car cost estimate conservative. The 6% investment return is also a nominal, pre-inflation assumption. The relative comparison remains valid either way.
What if I need a car for work?
Then a car is a tool that generates income — and the calculation changes. But even then, understanding the true cost helps you choose the right car at the right price. A ฿500,000 used car serves the same purpose as an ฿800,000 new one, with significantly lower total costs.
Is 6% a realistic return?
6% is a common long-term assumption for a diversified stock portfolio. Actual returns vary — savings accounts and bonds typically yield less, and past performance does not guarantee future results. You can test different rates with our Compound Interest Calculator.
→ Read next: Compound Interest Calculator — See how your money can grow over time.