Buying a Car: New vs. Used, Financing, and Total Cost of Ownership

New vs. Used Car: Depreciation Analysis

Depreciation is the largest cost of car ownership.

New car depreciation schedule:

• Year 1: Depreciates 20% (buyer loses $6,000 on $30,000 car)
• Year 2: Depreciates another 15% (loses another $4,200)
• Year 3: Depreciates 10% (loses another $2,400)
• Year 4: Depreciates 8% (loses another $1,600)
• Year 5: Depreciates 7% (loses another $1,200)
• 5-year value: $14,600 (from $30,000 new)

Total loss: $15,400 (51%)

Used car depreciation (3-year-old car):

• Start at: $20,000 (already lost the 20% year 1 depreciation)
• Year 1 of ownership (4th year overall): Depreciates 7% (-$1,400)
• Year 2 of ownership (5th year overall): Depreciates 6% (-$1,100)
• Year 3 of ownership (6th year overall): Depreciates 5% (-$875)
• 3-year value: $16,625

Total loss: $3,375 (17%)

Conclusion: Buying a 3-year-old used car costs 1/5th the depreciation of a new car.

Worked Example: New vs. Used Car Over 10 Years

Scenario: Need reliable transportation for 10 years

Option A: Buy new, keep 10 years

• Purchase price: $30,000
• Depreciation (10 years): Car worth ~$8,000
• Total depreciation cost: $22,000
• Plus: Maintenance, repairs, insurance

Option B: Buy 3-year-old used, keep 7 more years

• Purchase price: $20,000
• Depreciation (7 years): Car worth ~$6,000
• Total depreciation cost: $14,000
• Plus: Maintenance, repairs, insurance
• Depreciation savings: $8,000

You save $8,000 in depreciation alone by buying used.

Total Cost of Ownership: Full Analysis

Annual cost of owning a car:

A. Depreciation: Highest cost

• New car: $4,400/year (over 5 years)
• Used car (3-yr-old): $2,000/year (over 5 years)

B. Financing (interest)

• Borrow $24,000 at 4% over 5 years
• Total interest paid: $2,500
• Annual cost: $500/year

C. Insurance

• New/used car: $1,200-$1,500/year
• Varies by model, driver age, location

D. Maintenance

• New car (warranty covers first 3 years): $200/year
• Used 3-year-old car: $600/year
• Used 8+ year old car: $1,200+/year

E. Gas/Fuel

• 12,000 miles/year at 25 mpg = 480 gallons
• At $3/gallon = $1,440/year
• Hybrid: $800/year

F. Registration/taxes

• $200-400/year depending on location

TOTAL ANNUAL COST (new car):

• Depreciation: $4,400
• Interest: $500
• Insurance: $1,300
• Maintenance: $200
• Gas: $1,440
• Registration: $300
• Total: $8,140/year

TOTAL ANNUAL COST (3-year-old used car):

• Depreciation: $2,000
• Interest: $500
• Insurance: $1,300
• Maintenance: $600
• Gas: $1,440
• Registration: $300
• Total: $6,140/year

Savings from buying used: $2,000/year

Over 10 years: $20,000 in savings

New Car Financing: 0% APR vs. 4% APR

Many dealers offer 0% APR on new cars. Should you take it?

Scenario: $30,000 new car

Option A: 0% APR financing

• Borrow $30,000 at 0%
• 5-year loan: $500/month
• Total paid: $30,000
• Interest paid: $0

Option B: 4% APR financing (or higher)

• Borrow $30,000 at 4%
• 5-year loan: $552/month
• Total paid: $33,120
• Interest paid: $3,120

0% APR saves $3,120 over the loan term.

Trade-off: 0% APR often requires lower cash-back discount.

Example:

• 0% APR vs. $3,000 cash-back discount
• 0% APR is better (saves $3,120 vs. only $3,000 discount)

Always compare full offer: APR + rebates + cash back.

Used Car Financing: What APR is Acceptable?

Used cars typically have higher APR than new cars.

Typical rates (2024):

• New car: 3-5% APR
• Used car (0-3 years old): 4-6% APR
• Used car (4-7 years old): 6-8% APR
• Used car (8+ years old): 8-12%+ APR

Rule: Don't pay >4% APR for a car.

If the only available rate is 6%+, either:

1. Buy cheaper car
2. Make larger down payment
3. Wait and save more

Example of APR impact:

$25,000 car over 5 years:

• At 2% APR: $461/month, total paid $27,660
• At 4% APR: $483/month, total paid $28,980
• At 6% APR: $507/month, total paid $30,420
• At 8% APR: $531/month, total paid $31,860

Difference between 2% and 8%: $4,200 extra in interest.

Better to have a lower price car with low APR than higher price car with high APR.

The $30,000 Rule: Affordability Check

Your car payment + insurance + gas shouldn't exceed 15% of gross income.

Example: $60,000 gross income

Max car budget: $60,000 × 15% = $9,000/year Monthly: $750/month

Breakdown:

• Car payment: $400/month
• Insurance: $150/month
• Gas: $200/month
• Total: $750/month

This allows $30,000-40,000 car (financed over 5 years).

If you want a $50,000 car, your income needs to be $100,000+.

Most people violate this rule:

• Median household income: $75,000
• Median car payment: $500+ (for new cars)
• Median insurance: $150/month
• Median gas: $150/month
• Total: $800/month = 12.8% of income (close to limit, but very tight)

Many people spend 20%+ of income on transportation.

When to Buy New vs. Used

Buy new if:

1. You keep cars 8+ years (amortize depreciation over long period)
2. You drive 5,000 miles/year or less (minimize maintenance)
3. 0% APR is available (excellent financing)
4. You want latest safety/tech features
5. You can afford the higher cost (have emergency fund)

Buy used if:

1. You keep cars 5-7 years (standard ownership period)
2. You drive 10,000+ miles/year (maintenance costs rise)
3. You want to minimize total cost
4. You have limited budget
5. You're budget-conscious

Certified Pre-Owned (CPO) vs. Private Used

Certified Pre-Owned (CPO):

• Inspected and warranted by dealer
• Often 100,000+ miles covered by factory warranty
• Costs 10-15% more than private used
• Example: Private used $15,000, CPO $17,000

Advantage: Peace of mind, warranty coverage Disadvantage: Higher purchase price

Private used car:

• Sold by owner, no warranty (as-is)
• Costs 10-15% less than CPO
• Requires pre-purchase inspection ($150)
• More risk if seller hides issues

Recommendation: For first-time buyers or those risk-averse, CPO is worth the premium. For experienced buyers, private sale with pre-purchase inspection is fine.

Financing vs. Lease vs. Pay Cash

Financing (borrow money for car):

• Pros: Keep car long-term, build equity
• Cons: Paying interest
• Best for: Those keeping car 5+ years

Leasing (rent car for 2-3 years):

• Pros: Always have new car, warranty, low maintenance
• Cons: Mileage limits (12,000/year typical), no equity
• Best for: Low mileage drivers who want new cars frequently

Pay cash:

• Pros: No interest, own car outright
• Cons: Ties up $20,000+ in depreciating asset
• Best for: Only if you have additional emergency fund

Analysis:

• If cash would deplete emergency fund: Finance
• If you have surplus cash: Pay cash (avoid interest)
• If you drive lots/want new cars: Lease (but check mileage)

Worked Example: Purchase Decision

You earn $70,000/year, have $10,000 saved, need a car

Budget: $70,000 × 15% = $10,500/year max = $875/month

Option A: Buy $15,000 used car

• Down payment: $10,000
• Borrow: $5,000 at 4% for 3 years
• Payment: $147/month
• Insurance: $150/month
• Gas: $200/month
• Maintenance: $50/month
• Total: $547/month (62% of budget) ✓

Option B: Buy $25,000 used car

• Down payment: $10,000
• Borrow: $15,000 at 4% for 5 years
• Payment: $276/month
• Insurance: $150/month
• Gas: $200/month
• Maintenance: $75/month
• Total: $701/month (80% of budget) ✓

Option C: Buy $35,000 car

• Down payment: $10,000
• Borrow: $25,000 at 4% for 5 years
• Payment: $460/month
• Insurance: $150/month
• Gas: $200/month
• Maintenance: $100/month
• Total: $910/month (104% of budget) ✗

Decision: Option A or B. Option B is stretching but acceptable.

Action Items: Buy a Car Affordably

1. Calculate your budget: Income × 15% = annual max
2. Decide timeline: How long will you keep the car?
3. Target 3-5 year old used cars: Best value proposition
4. Get pre-approved financing: From bank/credit union before dealer
5. Get pre-purchase inspection: On any used car ($150, worth it)
6. Compare APR: Should be 3-4% max
7. Avoid unnecessary features: Fancy trim levels depreciate same as base
8. Plan for total costs: Payment + insurance + gas + maintenance

The best car to own is a reliable used car with a low payment that fits your budget.