Entry № 13 · logged Oct 1, 2026Free, no sign-upLease vs Buy · Car Finance
The money factor is the interest rate wearing a costume.
Somewhere in your lease worksheet sits a number like 0.00250, labeled “money factor,” quoted to five decimal places as if precision were the point. The point is camouflage: it’s the interest rate, and the translation is one multiplication — money factor × 2400 ≈ APR — so 0.00250 is about 6.00%. This page explains the costume, then runs the full lease-vs-buy slip so you can see what that rate actually costs.
0.00250 × 2400 = 6.00% APR. Anything above ~0.00375 (9%) is loan-shark territory.
The dealer's desk slip, Form LVB-13. Left ledger: the lease offer, line by line. Right ledger: buying the same car with a loan, minus the equity you keep. Every keystroke re-posts the net-cost verdict below the tear line.
Net cost is what each path really costs you: the lease's drive-off plus every payment plus mileage overage, against the buyer's down payment plus loan payments minus the equity left in the car at the end. The comparison window is the lease term.
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From the ledger
Reading the money factor like a rate sheet
A lease payment has three parts: the depreciation (the car’s value loss over the term, divided by the months), the rent charge (the interest, computed from the money factor), and tax. The rent charge is roughly (capitalized cost + residual value) × money factor, every month. On the seeded $35,000 car at 0.00250 that’s about $134 a month of pure interest hiding inside the $495 payment — more than a quarter of what you’re paying.
The translation is exact enough to negotiate with: 0.00208 is 5%, 0.00250 is 6%, 0.00292 is 7%, 0.00333 is 8%. Dealers mark the factor up the way they mark up loan rates — the “buy rate” from the leasing company might be 0.00210 while the worksheet shows 0.00250, and that 0.00040 of markup is pure dealer profit, about $21 a month on this car. Ask for the buy rate; the costume slips.
Where it bites the verdict: a money factor of 0.00400 (about 9.6%) adds roughly $81 a month in rent charge versus 0.00250 — $2,930 over 36 months, which alone flips the seeded $46 coin flip into a decisive buy win. Type your real factor’s APR equivalent into the loan-rate line on the buy side for a like-for-like feel, or just run the slip: the net cost already prices whatever deal you were actually offered.
Disclaimer: the figures here are arithmetic, not financial advice. Resale values are guesses, money factors are negotiable, and your credit decides your rate — the dealer’s worksheet has the final word.
Filed answers
Questions from the finance office
Why don’t leases just quote an APR?
Because “0.00250” doesn’t invite comparison and “6%” does. The money factor is the lease industry’s native unit — it plugs directly into the rent-charge formula — but quoting it to five decimals mostly serves to make the interest unreadable. Multiply by 2400 and read it like any other rate.
What’s a good money factor in 2026?
Around 0.00200–0.00250 (roughly 5–6%) is competitive for top-tier credit right now; subsidized manufacturer leases can go far lower, sometimes near zero. Anything above about 0.00375 (~9%) deserves a counter-offer or a walk-away — you’d do better financing the purchase at that point.
Can I negotiate the money factor?
The markup over the leasing company’s buy rate, yes. Dealers routinely add 0.00040–0.00100 to the buy rate as profit. Ask “what’s the buy rate?” directly — on this $35,000 example, killing 0.00040 of markup saves about $750 over the lease. The capitalized cost (the price) is negotiable too; negotiate both, not just the payment.
Does the money factor affect the residual?
No — they’re independent levers. The residual is set by the leasing company (it’s their guess at the car’s future value), while the money factor is the interest on the deal. A great lease needs both: a high residual shrinks the depreciation you pay for, and a low factor shrinks the interest. One can’t rescue the other.
How do mileage limits change the math?
They’re the lease’s hidden second price. Drive 15,000 miles a year against a 12,000 cap at $0.25 a mile and you owe $2,250 at turn-in — enough to flip the seeded verdict from a $46 coin flip to a $2,296 win for buying. Be honest about your real miles before you sign; the slip has a line for exactly that.
Is this financial advice?
No — it’s arithmetic on numbers you type. It doesn’t check your credit, negotiate your money factor, or know what your car will really be worth in three years. The dealer’s worksheet and your own budget have the final word.
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