How do I convert money factor (MF) to APR?

APR ≈ MF × 2400. For example, MF 0.00125 ≈ 3.0% APR.

What are MSDs (Multiple Security Deposits) and do they save money?

MSDs are refundable deposits that lower the money factor. Each deposit often drops MF by 0.00005–0.00010 (brand-specific). Savings come from lower rent charges, and deposits are refunded at lease end (less any charges).

What is Due At Signing (DAS) in a lease?

DAS commonly includes first payment, acquisition fee, government/doc fees, upfront taxes (if applicable), and any cash down or MSDs. This calculator itemizes DAS and lets you choose which items are capitalized vs. paid upfront.

How is a lease payment calculated?

Monthly payment = Depreciation fee + Rent charge + taxes. Depreciation fee = (Adjusted Cap Cost – Residual) / Term. Rent charge = (Adjusted Cap Cost + Residual) × MF.

Free lease TCO calculator — MF→APR & MSDs supported

Car Lease Cost of Ownership Calculator (MF→APR, DAS, MSDs)

Reveal the real total cost vs. teaser payment. Save, share, and revisit before dealer visits.

Vehicle & Terms Tip: Use Print to take to the dealership

MSRP $

Negotiated price (cap cost basis) $

Term (months)

Annual miles

Residual (% of MSRP)

Residual override ($) $

Money Factor (MF) i

APR (derived)

Pricing, Fees & Taxes

Incentives / rebates

Acquisition fee $

Doc + other dealer fees

Gov/DMV/registration upfront

Add-ons (warranty, accessories) capitalized

Tax rate (%)

Tax method

Taxable base override ($) (optional) ?

Capitalize acquisition fee

Capitalize doc/dealer fees

Capitalize gov/DMV fees

Capitalize upfront taxes

Include first payment in DAS

Cash, Trade & MSDs

Cash down (cap reduction)

Trade-in value

Trade payoff (if any)

MSDs (count)

MF reduction per MSD

MSD rounding

MSD holdback (%)

Ownership costs (optional)

Insurance (monthly)

Maintenance/Wear (monthly)

Registration (annual)

Other monthly extras

One-time upfront extras (non-refundable)

Investment APR for MSD opportunity cost (%)

Authority-grade math Dealer-ready breakdown Permalink & share

$—

Monthly with tax

$—

Total cost of ownership (all-in)

—%

APR from MF (after MSDs)

$—

Due at Signing (estimated)

Payment breakdown

Lease internals

Signals

Cost composition

Due at Signing details

Dealer visit mode

Print or share this summary. Ask the dealer to match or explain any differences:

Request the official MF and residual from the captive/lessor.
Verify acquisition and doc fees; ask for capitalized vs. upfront structure.
Bring this MF→APR printout to push for buy-rate MF.
Consider MSDs for lower MF if offered by your brand.
Avoid large down payments; they’re at risk if the car is totaled.

This tool reveals real cost vs. teaser payment. Re-run it before signing any lease agreement.

Why this is the best tool for car lease total cost

We combine the core lease formula with real-world options: MF→APR conversion, MSDs, multiple tax methods, and a complete itemized TCO including insurance, maintenance, and registration.

Formulas we use (auditable math)

Residual value = MSRP × Residual% (or override)
Adjusted cap cost = Cap basis + capitalized fees + add-ons + negative equity – incentives – cash down – positive trade equity
Depreciation fee = (Adjusted cap cost – Residual) ÷ Term
Rent charge = (Adjusted cap cost + Residual) × MF
Monthly base payment = Depreciation fee + Rent charge
APR ≈ MF × 2400

Supported tax methods

On monthly payment (most states)
Upfront on total payments
Upfront on cap cost (e.g., TX)
Upfront on depreciation only

Common questions

Should I put money down on a lease?

Generally, avoid large down payments; they reduce monthly payment but are at risk if the vehicle is totaled. Consider MSDs instead where available.

Are MSDs worth it?

Often yes. They reduce MF, lowering rent charges. This tool computes MSD savings and an implied return based on your term and deposit amount.

How do I pressure-test a dealer quote?

Ask for MF, residual, fees, and taxes in writing. Enter them here. If the APR looks high or doc fees are out of range, negotiate.

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Disclaimer: For education only. Verify tax rules and fees with your dealer/lessor.