The number in the ad is engineered
Advertised lease payments are chosen first and constructed backwards. A dealer who wants a $299 headline can raise the amount due at signing, stretch the term, or cut the mileage allowance until the payment lands there.
None of those changes make the lease cheaper. They move money from one line to another, and the line they move it to is the one nobody compares.
This is not deception so much as convention — every advertiser does it, so any who stopped would look expensive by comparison.
The fix is one division
Add everything you will pay across the whole lease: the amount due at signing, every monthly payment, and any fee due at the end. Subtract anything genuinely refundable, such as security deposits. Divide by the number of months.
That is your effective monthly cost, and it is the only figure that survives having the deal restructured underneath it. Two leases with the same effective cost are the same deal, whatever their advertised payments say.
A $299 lease with $4,000 due at signing over 36 months costs $410 a month. A $360 lease with nothing down costs $360. The cheaper-looking one is $50 a month worse.
Where state tax hides
Effective cost also captures something most comparisons miss entirely: your state may want the whole lease's tax at signing rather than spread across the payments.
In Texas, tax is assessed on the full vehicle price up front, which can add several thousand dollars to the amount due at signing while leaving the monthly payment untouched. Two identical leases, one signed in Texas and one in Florida, can differ by more than $2,500 at signing.
A monthly payment that ignores this is not comparable across state lines at all.
Common questions
- How do you calculate the true monthly cost of a lease?
- Add the amount due at signing, all monthly payments, and any end-of-lease fee. Subtract refundable deposits. Divide by the number of months in the term. That figure is comparable across offers regardless of how they are structured.
- Why is the advertised lease payment misleading?
- Because the amount due at signing is a free variable. A dealer can hit almost any monthly payment by moving money into the up-front figure, extending the term, or reducing the mileage allowance, none of which makes the lease cheaper.
- Should I compare leases on monthly payment or total cost?
- Effective monthly cost — total of everything paid, divided by the term. Monthly payment alone can be engineered to any number, and total cost alone is not comparable between different term lengths.
Put it to work
Run the numbers on a real deal — with your state's actual tax treatment and security deposits included.
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