Manufacturing and selling cars is obviously permissible. The Prophet used mounts and carts; the concept of personal transportation is as old as commerce. So you'd think automaker stocks would be an easy pass for Muslim investors.

And yet most of them fail Shariah screening. The reason isn't the cars. It's what the automakers built around the cars: captive finance subsidiaries that generate billions in interest income from auto loans. Ford Motor Credit, GM Financial, Tesla's financing arm, and similar operations turn these companies into hybrid industrial-financial businesses. The financial side breaks the screen.

Let me walk you through how each of the major automakers stacks up and why Toyota is actually the most interesting case.

The captive finance problem

Almost every major automaker has a financing subsidiary. It exists because customers want to buy cars on credit, and the automaker can make money by providing that credit at a better spread than a third-party lender. The captive finance arms originate loans and leases for dealers and retail customers, service those loans, and earn interest and fees.

For Ford, this subsidiary is Ford Motor Credit. For GM, it's GM Financial. For Stellantis, it's the Stellantis Financial Services arm. For Toyota, it's Toyota Motor Credit Corporation. For Tesla, it's Tesla Finance.

Revenue from these subsidiaries is primarily interest income. And it's substantial. Ford Motor Credit alone generates over $11 billion in annual revenue, nearly all of it interest-based. That revenue flows through to Ford Motor Company's consolidated income statement.

Under Shariah screening methodology, interest income is non-permissible income. If the automaker's total non-permissible income (captive finance interest plus other incidental items) exceeds 5 percent of total revenue, the company fails the 5 percent threshold and gets rejected at the sector level.

Let's see how the math works for each company.

Ford Motor Company (NYSE: F)

Core business: Vehicle manufacturing and sale. Permissible. Plus Ford Motor Credit captive finance.

Non-permissible income: Ford Motor Credit revenue is about $11 billion on total Ford revenue of ~$176 billion. That's about 6 percent. Plus other interest income from cash. Non-permissible income is above the 5 percent threshold. Fails.

Debt-to-market-cap: This is also bad. Ford carries massive debt primarily related to the financing subsidiary. Long-term debt around $100 billion against a market cap of ~$48 billion. Debt ratio over 200 percent. Catastrophic fail.

Result: Ford fails Shariah screening on both non-permissible income and debt ratio. Not investable.

General Motors (NYSE: GM)

Core business: Vehicle manufacturing. Permissible. Plus GM Financial.

Non-permissible income: GM Financial revenue is about $14 billion on total GM revenue of ~$175 billion. That's about 8 percent. Above threshold. Fails.

Debt-to-market-cap: Long-term debt around $105 billion (including GM Financial debt) against a market cap of ~$55 billion. Debt ratio about 190 percent. Fails.

Result: Fails on both. Not investable.

Stellantis (NYSE: STLA)

Stellantis is the parent of Jeep, Dodge, Chrysler, Ram, Fiat, Peugeot, Citroen, Alfa Romeo, Maserati, and Opel. Formed by the Fiat Chrysler / PSA merger in 2021.

Core business: Vehicle manufacturing. Permissible.

Non-permissible income: Stellantis has finance operations but outsources more of its consumer financing to bank partners. Captive finance revenue is smaller as a share of total. Still typically over the 5 percent threshold. Borderline.

Debt-to-market-cap: Lower than Ford or GM but still meaningful. Varies year to year.

Result: Usually fails but closer to the line than Ford or GM.

Toyota Motor Corporation (NYSE: TM)

Here's where it gets interesting. Toyota has TMCC (Toyota Motor Credit Corporation), a major captive finance arm. Same structure as Ford and GM. Same type of interest income.

Core business: Vehicle manufacturing. Permissible.

Non-permissible income: TMCC revenue plus interest income at Toyota is substantial. As a percentage of Toyota's enormous total revenue (~$350 billion), the non-permissible share is generally around 5 to 7 percent. Borderline to fail.

Debt-to-market-cap: Toyota has meaningful long-term debt including TMCC debt. Long-term debt around ¥27 trillion (~$180 billion) against a market cap of ~$320 billion. Debt ratio about 56 percent. Fails.

Result: Fails on both dimensions. Not investable under most methodologies.

This is surprising to some investors who think of Toyota as conservative and clean. The balance sheet is still impacted by the financing subsidiary in the same way as the US automakers.

Tesla (NASDAQ: TSLA)

Core business: EV manufacturing, energy storage, some solar. Permissible.

Non-permissible income: Tesla has a financing arm (Tesla Finance) but it's much smaller relative to total revenue than the legacy automakers. Most Tesla customers who finance their vehicles use third-party lenders. Tesla also earns some interest on cash holdings.

Estimated non-permissible income for Tesla is typically under 3 percent of revenue. Passes.

Debt-to-market-cap: This is actually where Tesla is surprisingly clean. Long-term debt around $2.9 billion against a market cap of ~$700 billion (though Tesla's market cap is volatile). Debt ratio under 1 percent. Passes easily.

Cash ratio: Tesla holds around $18 billion in cash and short-term investments. Ratio about 2.5 percent. Passes.

Result: Tesla passes Shariah screening currently. This is the only US-listed major automaker that does.

Worth noting: Tesla's market cap is famously volatile. If the stock drops by half, the debt ratio would still pass but the cash ratio might move slightly. Even under downside scenarios, Tesla's balance sheet is clean enough to stay within Shariah tolerances.

Honda Motor (NYSE: HMC), Nissan (OTC: NSANY), Subaru (OTC: FUJHY)

Japanese automakers have captive finance arms similar to Toyota's TMCC. Non-permissible income usually ranges from 4 to 8 percent depending on the year. Debt ratios are usually high enough to fail as well.

Honda: Usually fails.
Nissan: Fails.
Subaru: Sometimes closer to passing. Check current figures.

BMW, Mercedes-Benz, Volkswagen

European luxury and mass-market automakers. All have large captive finance operations.

BMW (DE: BMW): BMW Financial Services is a substantial revenue contributor. Non-permissible income typically over 5 percent. Debt ratio usually over 50 percent. Fails.

Mercedes-Benz Group (DE: MBG): Similar structure. Fails.

Volkswagen (DE: VOW3): Volkswagen Financial Services is enormous. VW fails both screens.

Porsche (DE: P911): Listed in 2022 after spin-off. Smaller finance arm relative to manufacturing. Borderline. Check current figures.

Ferrari (NYSE: RACE)

Ferrari is a unique case because of its extreme pricing and relatively small unit volume.

Core business: Ultra-luxury vehicle manufacturing.

Non-permissible income: Ferrari has some financing activity but it's a very small part of total revenue. Passes 5 percent threshold.

Debt-to-market-cap: Long-term debt around $3 billion against a market cap of ~$85 billion. Debt ratio about 3.5 percent. Passes easily.

Result: Ferrari passes Shariah screening. This makes it one of the few halal-compliant automaker stocks outside of Tesla.

Aston Martin (LSE: AML)

Small luxury automaker. Financial troubles over the years have led to repeated capital raises and high use.

Debt-to-market-cap: Very high. Fails.

Rivian, Lucid, NIO, and other EV pure-plays

Covered in the EV pure-plays article. Short version: most fail on debt or cash-burn issues.

Mahindra & Mahindra, Tata Motors (NSE, NYSE: TTM)

Indian automakers. Tata Motors owns Jaguar Land Rover.

Tata Motors: Has finance operations. Non-permissible income typically around 4 to 6 percent. Debt ratio variable. Borderline.

Mahindra: Similar.

Auto parts companies: much cleaner

Here's where the sector gets interesting. Auto parts and component suppliers usually don't have captive finance operations. They sell to automakers, not to end consumers, so there's no consumer lending to generate interest income.

Aptiv (APTV): Electrical architecture and automotive software. Passes sector and ratios.

BorgWarner (BWA): Drivetrain and powertrain components. Usually passes.

Lear Corporation (LEA): Automotive seating and electrical. Passes.

Magna International (MGA): Diversified auto supplier. Passes.

Gentex (GNTX): Automotive mirrors and electronics. Clean balance sheet. Passes easily.

Autoliv (ALV): Safety systems. Passes.

These are the easy halal plays on the automotive sector. You get exposure to vehicle demand without the captive finance drag.

Auto dealers

The largest US auto dealer groups (AutoNation, Lithia Motors, Penske Automotive Group, Group 1 Automotive, Sonic Automotive) have mixed results. They mostly sell cars (permissible) but also generate significant revenue from in-house financing and insurance product sales. Non-permissible income often exceeds 5 percent. Debt ratios can be high.

Dealer stocks typically fail or are borderline.

Rental car companies

Hertz (HTZ), Avis Budget Group (CAR) operate rental fleets. Both have heavy debt loads to finance vehicle fleets. Both typically fail the debt ratio. Both have small non-permissible income exposures beyond that.

Tesla as the accidental halal play

The fascinating thing about the automotive sector is that Tesla, probably the most controversial and polarizing major stock of the past decade, is arguably the only large US automaker that cleanly passes Shariah screening. Not for ideological reasons, not because Elon did anything particularly Muslim-friendly, but because Tesla happened to adopt a business model that didn't lean heavily on captive finance.

The legacy automakers built financing businesses over decades because it was a profitable way to turn one-time vehicle sales into recurring interest revenue. Tesla came along and didn't bother building that infrastructure at scale. The result: a much cleaner revenue mix from a Shariah screening perspective.

The bottom line

Most automakers fail Shariah screening, but the failure is almost always about the captive finance subsidiary rather than anything to do with manufacturing cars. Ford, GM, Toyota, Honda, Nissan, BMW, Mercedes, VW, and Stellantis all fail because of the interest income and debt that comes with running a big consumer lending operation.

Tesla passes. Ferrari passes. Auto parts suppliers (Aptiv, BorgWarner, Gentex, Magna) generally pass.

If you want automotive sector exposure in a halal portfolio, focus on Tesla for EV exposure, Ferrari for ultra-luxury, and a basket of auto parts suppliers for the broader thesis. The legacy automakers are mostly off the table until they restructure their finance operations, which isn't going to happen any time soon.

Run any automaker ticker through FaithScreener and you'll see the captive finance impact clearly in the non-permissible income line.

Auto Manufacturers: Ford, GM, Toyota, Tesla and the Car-Loan Subsidiary Problem