Used vs New Car Calculator (Singapore, 2026)

Using the calculator step by step

Use this to compare used vs new cars using a consistent unit: depreciation + running costs per month. Don’t compare sticker prices alone.

1. Enter purchase price, expected resale value, and ownership period.
2. Enter insurance/maintenance differences.
3. Compare total monthly cost and break-even.

Scenario library (sanity checks)

Use these simplified scenarios as sanity checks. Replace the numbers with your own situation.

• Example A (short horizon):

  New car: higher depreciation early. Used car: lower upfront but potentially higher maintenance. Test 2–3 year holding period.

• Example B (long horizon):

  Over 5–7 years, depreciation profiles differ. Use realistic resale assumptions.

Methodology & assumptions

• Resale values are uncertain; use conservative estimates and test ±10%.
• Maintenance varies widely by model and age.
• Planning model; not advice.

This is one of those decisions where a slightly higher monthly cost can still be rational if it buys certainty and lower downtime risk.

• Choose used if you want lower initial outlay and can tolerate more maintenance uncertainty.
• Choose new if predictability, warranty, and longer horizon stability matter.
• Re-check the result if the conclusion depends on optimistic resale assumptions.

Decision cues beyond the numbers

Used cars often win on upfront depreciation, but that advantage can narrow if you expect meaningful repairs or if the remaining COE horizon is short. New cars often look expensive on the sticker, but the predictability, warranty coverage, and lower maintenance uncertainty can matter if you want a cleaner ownership experience. The longer you hold, the more those structural differences matter.

Why the answer can change with your ownership horizon

This page works best when the cars you compare are genuinely substitutes. If you compare a smaller used car to a much nicer new car and conclude the used one is “cheaper”, you have not really answered the decision. A good comparison holds function broadly constant — similar size, similar use case, similar expected ownership horizon — and then asks where the money really goes: depreciation, financing, maintenance risk, and peace of mind.

How to compare fairly

Before acting on the result, ask whether the output still makes sense after a conservative stress test. Good calculator use is not about precision to the last dollar; it is about avoiding decisions that only work in the optimistic case. If the answer still holds after you use harsher assumptions, that is usually a sign the decision is robust enough to move forward.

Output checklist

Re-run the calculator whenever one of the major assumptions changes meaningfully: rate, tenure, resale value, rent, energy cost, or your expected holding period. Small updates to these inputs often matter more than trying to make the original run more precise.

When to re-run the model

Use the model to see which assumptions matter most. Then spend your energy validating those assumptions rather than polishing less important inputs.

Even a good calculator cannot fully price convenience, stress, optionality, or the value of keeping your finances simple. That is why the best use of a tool like this is to narrow the range of sensible choices, not to pretend it can replace judgement. When the result is close, qualitative factors deserve more weight.

What the calculator cannot decide for you

Use the model to see which assumptions matter most. Then spend your energy validating those assumptions rather than polishing less important inputs.

Even a good calculator cannot fully price convenience, stress, optionality, or the value of keeping your finances simple. That is why the best use of a tool like this is to narrow the range of sensible choices, not to pretend it can replace judgement. When the result is close, qualitative factors deserve more weight.

What the model leaves out

• Reading one “base case” as a certainty.
• Forgetting fees, taxes, or frictional costs that sit outside the neat formula.
• Using unrealistic tenure or holding-period assumptions.
• Comparing options that are not truly substitutes.

Common interpretation mistakes

• Reading one “base case” as a certainty.
• Forgetting fees, taxes, or frictional costs that sit outside the neat formula.
• Using unrealistic tenure or holding-period assumptions.
• Comparing options that are not truly substitutes.

Mistakes to avoid when reading the output

Run one optimistic case, one conservative case, and one “messy real life” case. The messy case is the most useful: slightly worse rates, slightly lower resale, slightly higher costs, and a shorter holding period than planned. If the decision still looks acceptable, you have a more resilient answer.

Quick scenario ideas

Use these quick situations to make the output more realistic.

• Short planned ownership period: if you may exit in a few years, a used car can look better if you avoid the steepest early depreciation — but only when the condition risk is manageable.
• Buyer who values warranty certainty: a new car may still be worth paying for if repair predictability and downtime reduction are more important than headline savings.
• Sticker discount that hides weak exit value: a used car only looks cheap if the remaining life, condition, and future resale assumptions are still reasonable.

References

• LTA

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