How to Compare Loans: Total Interest, APR & Terms

Metric

Loan A

Loan B

Diff (A−B)

Monthly payment

¥4,546

¥4,270

+¥276

Total interest

¥636,723

¥537,259

+¥99,464

Total repayment

¥1,636,723

¥1,537,259

+¥99,464

Interest/principal

63.7%

53.7%

—

Key Takeaways

Golden rule: compare APR (rate + fees) and total repayable, never the monthly payment alone

Longer ≠ better: 7-year at 4.0% costs more total interest than 5-year at 4.5% on the same principal

Fixed vs floating: fixed buys certainty; floating starts lower but resets with the market

Prepayment terms: a slightly higher rate with free prepayment often beats a lower rate with penalties

Core answer: Comparing loans: convert EVERYTHING to APR (annual percentage rate on remaining balance), then compare total interest + fees at your EXPECTED holding period. A 3.6% mortgage-style rate beats a "2.8% fee-rate" product (real APR ≈ 5.2%) every time. Shorter terms cost less interest but higher monthly payments; the break-even on term length is whether you can invest the payment difference above the loan rate.

The comparison framework

Normalize to APR — flat fee rates (费率) × ~1.85 ≈ APR; ask lenders for the APR directly (required disclosure in China since 2021).
Total cost = interest + all fees (origination, insurance bundling, GPS, service).
Match your horizon — comparing 3-yr vs 5-yr on total interest is unfair if you'd repay the 5-yr early anyway; compare at YOUR payoff date.
Monthly-payment fit — debt payments ≤ 40% of take-home is the safety band.

Worked examples

Example 1 — Bank vs dealer finance. ¥200k car: bank 3.8% APR/3yr = ¥11,940 interest, no fees. Dealer "0 interest" + ¥8,000 fee + forced ¥3,000 in-store insurance premium = ¥11,000 and worse flexibility. Near tie — but the bank allows free early repayment.

Example 2 — Mortgage term choice. ¥1M at 3.3%: 20-yr payment ¥5,697, total interest ¥367k; 30-yr ¥4,380, interest ¥577k. Choosing 30-yr and investing the ¥1,317/mo difference at 4% beats the 20-yr option financially — but requires actual investing discipline; otherwise take 20 years.

Example 3 — Consumer loan trap. "月息0.5%" (0.5%/month flat) on ¥50k: sounds like 6%/year, actually flat-fee → real APR ≈ 11–13%. At ¥300k these products cost ¥20k+ more than a bank's 4% credit-line loan over 3 years.

Example 4 — Early repayment comparison. Loan A 3.6% with 1% early-repay penalty; Loan B 3.75% penalty-free. Planning to repay in 2 years: A's penalty (1% of ¥1M = ¥10k) exceeds the 0.15% rate difference saved (¥3k) — B wins for your horizon.

Common mistakes and myths

费率 vs 利率 — the oldest trick in lending; APR conversion is non-negotiable.
Comparing monthly payments — longer terms always show smaller payments with larger totals; compare totals at equal horizons.
Ignoring fees — a 0.3% rate advantage erased by ¥6,000 of fees on a ¥200k/2yr loan.
Assuming early repayment is free — penalties of 1–5% exist in the fine print, especially year 1–2.
Using the maximum approved amount — approval ≠ affordability; stress-test payments at +10% income shock.

Frequently Asked Questions

What should I compare when shopping for a loan?

Four numbers in order: (1) APR — rate plus mandatory fees, the only fair price metric; (2) total repayable over the full term; (3) monthly payment against your budget ceiling (≤40% of income); (4) prepayment terms. The lender advertising the lowest monthly payment usually has the longest term and highest total cost.

Why is APR different from the advertised rate?

APR bundles the nominal rate plus origination fees, service charges and mandatory insurance into one annualized figure. A loan at 3.8% with a 2% origination fee has an APR near 4.8%. Lenders advertise the nominal rate because it looks cheaper — regulations in most markets require APR disclosure, so find it.

Is a longer term ever worth it?

$200k at 4.5%: 5 years costs $23.7k interest; 10 years costs $48.7k — more than double. Longer terms make sense only when cash flow is genuinely tight or you can reliably invest the difference above the loan rate. Otherwise take the shortest term whose payment stays under 40% of take-home income.

Fixed or floating rate — how do I choose?

Fixed: payment certainty, best when rates are historically low or your budget has no slack. Floating: starts 0.3-0.8pp lower, wins if rates fall, hurts if they rise. Choose floating only if you can absorb a +2pp scenario — stress-test the payment before signing.

What hidden fees inflate loan costs?

Origination (1-3%), account maintenance (monthly), mandatory life/disability insurance (often 20-50% overpriced vs standalone), documentation fees, and prepayment penalties (1-5% of balance). On a $100k loan these can add $5k+. Ask for the full fee schedule and the total amount repayable in writing.

Should I prioritize a low rate or flexible prepayment?

If you realistically expect bonuses or income jumps to prepay with, flexibility wins: a 4.3% loan with free prepayment often beats a 4.0% loan with 3% penalties. One $20k prepayment saves more than 0.3pp of rate on the remaining balance. If you will never prepay, just take the lowest APR.