buying a new car

Proposed Tax Bill by Trump – Deduction on auto loan Interest

This hypothetical tax bill aims to boost domestic car manufacturing by making interest on loans for American-made cars tax-deductible. Under this proposal:

  1. Encouragement of Domestic Manufacturing: By limiting the deduction to cars built in the U.S., the policy encourages consumers to support the domestic car industry, potentially helping manufacturers and supporting local jobs.
  2. Tax Savings for Consumers: Car buyers would benefit from a reduction in their taxable income by the amount of interest paid on the loan. For those in higher tax brackets, the savings could be substantial, effectively reducing the cost of borrowing.
  3. Expanded Affordability: For many, this tax deduction could make financing a new car more attractive, stretching budgets slightly further and possibly allowing for the purchase of a more expensive American-made car within a responsible spending plan.

Now, let’s explore how this would impact the affordability of a car for someone making $100,000 under the 20/4/10 rule.

Understanding the 20/4/10 Rule

This rule is a popular guideline for car affordability that helps buyers stay within budget and avoid excessive debt. Here’s how it works:

  1. 20% Down Payment: Place a down payment of at least 20% to reduce the financed amount, helping avoid negative equity.
  2. 4-Year Loan Term: Limit the loan to 4 years to minimize interest costs and avoid prolonged debt.
  3. 10% of Monthly Income for Total Car Costs: Monthly car expenses—including the loan payment, insurance, and maintenance—shouldn’t exceed 10% of gross monthly income.

Given these guidelines, let’s determine how much car this buyer can afford, applying the current average car loan interest rate of 8% and then exploring the impact of the proposed tax deduction.


Step 1: Determine Monthly Budget and Purchase Price

  • Annual Income: $100,000
  • Gross Monthly Income: $8,333
  • 10% Limit for Car Expenses: $833/month, covering the loan payment, insurance, and maintenance.

Assuming insurance and maintenance cost around $150-$200/month, that leaves $633-$683/month available for the loan payment.

Step 2: Calculating the Car Loan with an 8% Interest Rate

With a 4-year loan term and 8% interest rate, let’s see how much car this budget would allow.

Using a monthly payment of $683 for the loan:

  1. Loan Amount: This payment allows for a loan amount around $26,500.
  2. Total Car Price: With a 20% down payment, the total car price would be: 26,500÷0.8=33,125. This means the buyer could afford a car priced around $33,000 without any tax deduction.

Step 3: Impact of the Hypothetical Tax Deductible Interest Law

If the interest on car loans for American-made vehicles were tax-deductible, it would reduce the effective cost of financing.

Calculating Potential Tax Savings

With an 8% interest rate on a $26,500 loan over 4 years, the total interest paid would be around $4,590.

For someone in the 24% tax bracket, the tax savings would be:

  • Tax Savings: $4,590 in interest * 24% = $1,101 in tax savings over the loan’s life, or about $23 per month in additional savings.

Adjusted Affordability with Tax Savings

With an extra $23/month to put toward the loan payment:

  • New Monthly Payment Budget: $706/month ($683 + $23)
  • New Loan Amount: At 8% interest over 4 years, a $706/month payment would allow a loan of $27,500.
  • New Total Car Price: 27,500÷0.8=34,375. So, with this tax deduction, the buyer could now afford a car priced around $34,000-$35,000.

Summary

Following the 20/4/10 rule, with a $100,000 income and an 8% interest rate:

  • Without Deduction: Affordable car price is approximately $33,000.
  • With Proposed Deduction for American-Made Cars: The affordable price increases slightly to $34,000-$35,000.

While the tax deduction wouldn’t drastically increase the affordable price range, it would provide added flexibility for this buyer, allowing for a slightly higher trim or additional features in a domestic vehicle. This scenario highlights how tax incentives can support American manufacturing while also making car ownership slightly more affordable for consumers.

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