Finance
-
021 Auto Leasing
Two car loan offers are only comparable when the same disclosure fields are visible side by side. This printable checklist mirrors what Reg Z requires lenders to put in writing at signing, so a careful shopper can ask earlier and compare cleanly.
Fast answer: nine fields that make a car loan comparable
Two car loan offers are only comparable when the same nine fields are visible side by side. Reg Z gives you four: APR, amount financed, finance charge, total of payments. The dealer worksheet should give you three more: vehicle price, trade-in value, dealer documentation/processing fees. The state of California gives you two: DMV registration components (with vehicle license fee called out) and sales/use tax on the purchase. Once those nine sit on the same row, ranking offers becomes mechanical instead of intuitive.
This checklist mirrors what the law already requires lenders and dealers to disclose at signing. CFPB and FTC guidance both reinforce the same idea in plainer language. The reason to ask earlier is not aggression; it is comparison. A worksheet that buries any of the nine inside a single combined fee or a single combined monthly is not necessarily dishonest, but it is not directly comparable to a worksheet that separates them. The cleanest move is to ask each dealer or lender for the same nine fields in writing, then read each offer against the others.
A printable version of this checklist lives at the bottom of the article. The order on the page mirrors the order on a typical retail installment contract, so a shopper can hold the checklist alongside the contract and tick each field as it appears.
Reg Z disclosure fields you must see in writing
Reg Z (12 CFR Part 1026) requires creditors to disclose specific fields before consummation. Five matter most for an auto-loan comparison. APR is the cost of credit expressed as a yearly rate, including most loan fees imposed as a condition of credit. Finance charge is the dollar cost of credit across the term. Amount financed is the principal you actually owe after prepaid finance charges and any cash paid. Total of payments is the sum of every scheduled payment over the loan term. Payment schedule shows the number, amount, and timing of payments.
Each one answers a different question. APR is the comparison anchor across loans of similar shape. Finance charge gives you the dollar version of that comparison. Amount financed exposes capitalized add-ons, prior negative equity, and prepaid finance charges. Total of payments is the cleanest single number for ranking similar offers, and CFPB guidance specifically recommends focusing on it rather than monthly payment alone. Payment schedule confirms whether the offer is a level-payment loan or carries balloon payments or other irregular structures the headline numbers would hide.
The FTC's auto-loan disclosure guidance reinforces all of this in plainer consumer language. If a quote refuses to put any of the five in writing at the comparison stage, that quote is not yet comparable to ones that do. The Reg Z disclosure has to appear at signing in any case; asking for it at the quote stage shortens the comparison window without changing the substance.
Vehicle-side fields the dealer controls
The dealer worksheet controls a separate set of fields that sit alongside the loan disclosure but are not inside it. The three that matter for comparison are vehicle price, trade-in value, and dealer fees. FTC guidance specifically recommends negotiating each as a separate item rather than combining them into a single monthly. The reason is mechanical: when the price, the trade-in, and the financing are combined, you cannot tell which lever moved when the deal changes. A "lower monthly" can come from a higher trade-in allowance offset by a higher vehicle price, and the actual dollars are the same.
Vehicle price is what the dealer is selling the vehicle for. Trade-in value is what the dealer is paying for your current vehicle, if any, and the difference between trade-in value and your loan payoff is your equity (positive or negative). Dealer fees are the documentation, processing, and any prep fees the dealership adds. None of these are inside the Reg Z disclosure; all of them affect the amount financed and the total of payments, which are.
Two practical rules follow. Get the vehicle price agreed in writing before discussing the trade-in. Get the trade-in agreed in writing before discussing financing. Then evaluate financing against your outside preapproval. This is the FTC's standing recommendation, and it is the only structure that lets you rank dealer offers across stores honestly. The dealer is allowed to use a single combined monthly as a sales tool; the buyer is allowed to ask for the components in writing.
California fields the DMV and CDTFA control
California adds two cost components that sit outside the loan disclosure but inside the worksheet at signing. The first is registration, including the vehicle license fee that scales with vehicle value. The DMV publishes a fee calculator that previews the registration components for a specific vehicle, and running it before reaching the dealer's finance office gives you a benchmark for the registration line on the worksheet. The second is sales/use tax on the purchase. CDTFA covers the tax basis: on a financed purchase, tax is generally collected on the full purchase price at the time of registration. The tax basis differs from how a lease's tax basis is computed.
Title and lien mechanics matter too. California DMV records the lienholder on the title when the vehicle is financed; the lienholder remains until payoff and lien release. The DMV's title page is the canonical reference. None of this changes the loan APR, but it shapes the all-in out-of-pocket cost at signing and the operations involved if the vehicle is later sold or refinanced.
The clean ask at the dealer is to disclose the DMV registration line and the sales/use tax line as separate line items on the worksheet, with the vehicle license fee called out and the registration components matched to the DMV calculator's output for the same vehicle. Discrepancies are worth flagging in writing rather than absorbing as "normal dealer fees." Most discrepancies are paperwork-level, but a careful shopper closes the gap explicitly.
Add-on traps: GAP, service contracts, and credit insurance
Add-ons are the largest category of last-mile cost shifts on an auto loan. Three of the most common are GAP coverage (covering a gap between insurance payout and loan balance after a total loss), extended service contracts (often called "extended warranties"), and credit insurance (covering loan payments under specified circumstances). CFPB guidance is explicit: optional add-ons financed into the loan increase the amount financed, which increases the monthly payment and the total cost of the loan. Add-ons are not always bad, but the cost has to be visible for the value question to be answerable.
The cleanest way to evaluate any add-on is to see the loan with the add-on and without the add-on on the same Reg Z disclosure. The delta in finance charge across the two versions tells you the actual price of the product over the loan term. Compare that delta to the price of buying the product separately or to the cost of the product through your insurance, your credit union, or another vendor. Sometimes the dealer-financed version is cheapest in dollars; often it is not.
The honest dealer worksheet allows the loan-with and loan-without comparison and lets the shopper decline an add-on without changing other terms. A worksheet that bundles an add-on into a single monthly without showing the delta is not necessarily dishonest, but it is not yet a comparable quote. A good test is to ask the dealer for the worksheet with each optional add-on removed. If removing an add-on changes the loan APR or the vehicle price beyond the obvious finance-charge delta, the add-on was acting as something other than a separately-priced optional product, and the shopper should ask why.
The send-this-to-each-lender template
The cleanest comparison structure is a one-page request that names the same inputs across every lender lane. The template below is a starting point. Adapt it to your own situation and the lenders you are shopping. Every field is one the regulators already expect to be in writing.
Vehicle: year, make, model, trim, exact options. Term: number of months. Down payment: dollar amount. Trade-in: dollar amount and lien payoff if any. Add-ons: list each add-on by product type, including dealer-supplied and third-party options, and request the loan disclosure both with and without each. Reg Z disclosure ask: APR, finance charge, amount financed, total of payments, payment schedule. Dealer fee ask: dealer documentation and processing fees, separately disclosed. California ask: DMV registration components matched to the DMV fee calculator output, sales/use tax on the purchase, and lienholder filing on the title.
Send the same template to every lender lane and dealer you are shopping. Read the responses against each other on the nine fields above. Rank by total of payments, with APR and term as the explanation. CFPB's complaint portal exists for the rare cases where a lender or dealer behaves outside the disclosure framework; in most comparisons, asking for the disclosure earlier is enough to keep the conversation aligned with what the law already requires later. If you would rather not run the comparison yourself, the 021 quote-review workflow applies the same checklist to whichever offers you have already received.
Frequently Asked Questions
What disclosure must a lender give me before I sign?
Reg Z (12 CFR Part 1026) requires creditors to disclose APR, finance charge, amount financed, total of payments, and the payment schedule before consummation. The FTC repeats this list in plainer language. Asking for those five fields in writing at the quote stage is consistent with what the law already requires later.
Can a dealer combine the price, the trade-in, and the financing into one number?
They can, but the FTC explicitly recommends negotiating the vehicle price, the trade-in, and the financing as separate items. Combined-into-monthly numbers obscure which lever moved when the deal changes, and they make line-by-line comparison across dealers harder.
Should I roll a service contract or GAP into the loan?
You can, and many shoppers do, but CFPB guidance is clear: optional add-ons financed into the loan increase the amount financed, the monthly payment, and the total cost of the loan. The decision is whether the value of the product justifies the extra finance charge. The numbers belong on the comparison sheet.
What does California add at signing?
Vehicle license fee, registration components, and sales/use tax on the purchase price. The DMV's fee calculator previews the registration components, the title page covers lienholder filing, and CDTFA covers the tax basis. Asking for those line items separately on the contract is a fair request, not aggressive negotiation.
Related 021 resources: lease pricing explainer, new-car research hub, buy vs lease comparison, new auto loan rate comparison framework, what actually makes a car loan cheaper, vehicle loan terms explained, why the lowest monthly can cost more, request a quote review, beat my deal review.
Next step
If you want a second set of eyes on a quote, use 021 Auto Leasing to review the structure before you sign.
