AutoMath

Financing ~3 min read

The Money Factor, Explained: The Lease Number Dealers Hope You Skip

A lease's money factor is the interest rate wearing a disguise. Multiply it by 2,400 to read it as an APR — and catch a marked-up lease in ten seconds.

Every lease has an interest rate. It’s just written in a way almost nobody can read: a tiny four-decimal number called the money factor. That’s not an accident. The money factor is the one part of a lease a dealer can quietly mark up, and the format is the camouflage.

The conversion is trivial

There’s exactly one thing to memorize:

APR % = money factor × 2400

So:

  • 0.00100 → 2.4% APR
  • 0.00125 → 3.0% APR
  • 0.00208 → 5.0% APR
  • 0.00250 → 6.0% APR

A money factor of 0.0025 looks like a rounding error. It’s a 6% APR. Going the other way, divide an APR by 2,400 to get the money factor you should expect to be quoted.

The money factor isn’t complicated. It’s just unreadable on purpose — and the conversion that fixes that takes ten seconds.

Buy rate vs sell rate

Like a loan’s interest rate, the money factor has a wholesale buy rate the bank offers and a sell rate the dealer can pad on top — the markup is dealer profit. You usually can’t see the buy rate, but you can sanity-check the sell rate: convert it to an APR and compare it to what you’d pay on a straight auto loan for the same credit. If the lease’s implied APR is meaningfully higher, you’re financing the car at a worse rate dressed up as a lease.

Why it costs more than it looks

A lease’s rent charge isn’t only on the money you’re “borrowing.” It applies to the cap cost plus the residual:

rent charge = (adjusted cap cost + residual) × money factor

That’s why even a lease with a high residual — where you’re paying for little depreciation — still carries a real finance charge. The money factor is grinding away on the full value of the car, not just the part you use up. See it move in the breakdown:

Your numbersSaved on this device only
The car
The deal
Monthly payment

$397.98

$371.94 base + $26.04 tax · money factor ≈ 3.00% APR

What you're paying for
Of each payment, $305.97 is depreciation (value you use up) and $65.97 is the rent charge (interest). Over 36 months that's $2,375 in finance charges alone.
Residual value
$20,880MSRP × residual %
Adjusted cap cost
$31,895price + fee − reductions
Total of payments
$14,327
Total lease cost
$16,327payments + cash down

Nudge the money factor and watch the rent-charge share of the payment swing while the depreciation fee sits still. That isolated number is the rate — and the thing to negotiate.

What about multiple security deposits?

Some banks let you lower the money factor by putting down refundable multiple security deposits (MSDs) — fully returned at lease-end, unlike a down payment. It’s effectively buying down the rate with money you get back. Not every program offers it, but if yours does, it’s one of the few genuinely good deals in a lease.

The one-paragraph version

The money factor is a lease’s interest rate written as a four-decimal number; multiply it by 2,400 to read it as an APR. It can be marked up like a loan rate, and it applies to the cap cost plus the residual, so it’s a real cost even on high-residual cars. Convert it, compare it to a loan APR, and — where offered — consider multiple security deposits to buy it down. Then build the full payment with the lease payment calculator.

  • Lease Payment — see the money factor’s rent charge inside the payment.
  • Lease vs Buy — compare the lease’s implied rate against buying.
  • Auto Loan — the APR to benchmark the money factor against.
  • Lease Buyout — at lease-end, what the residual really costs.

AutoMath is an educational tool, not financial advice.

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