Car Budget Calculator

• What goes in the 15% bucket:
  Loan payment + one-twelfth of annual insurance + one-twelfth of annual maintenance. This gives a more realistic picture than payment-only math, because bad months stack premiums and repairs on top of the note.
• Remaining monthly budget:
  Take-home pay minus all expenses you entered (housing, debt, savings, other) minus the car bundle. If this goes negative, the gross-income rule is not saving you from a tight month.
• Sales tax handling:
  In most states, sales tax is figured on price minus trade-in. The calculator models it this way; a handful of states differ. Doc fees, registration, and warranties are not included—assume your real limit is slightly below the number shown.

• Insurance and maintenance:
  Enter estimated annual insurance premium and annual maintenance cost for the type of vehicle you’re considering. Trucks and luxury models cost more on both fronts than compact cars—use realistic numbers or the “affordable” price will be misleading.
• Loan details:
  Choose a loan term, APR, down payment amount, trade-in value, and sales tax rate. Longer terms raise the price cap but increase total interest and time spent underwater on the loan.
• Review your price cap:
  Check the suggested maximum vehicle price at the 15% guideline and the 20% comparison figure (labeled as a stretch, not a target). Confirm the remaining monthly budget is positive and comfortable before committing.

A practical order when you buy

• Step 1:
  Pick insurance and maintenance guesses that match the kind of car you want, not the smallest numbers you can type.
• Step 2:
  Use this page for a suggested max price and the 20% line (labeled as a stretch, not a target).
• Step 3:
  Lock in out-the-door price, then run it through the auto loan calculator and, if you care about mortgage qualification, the debt-to-income calculator.

Gross monthly income and what goes in the bucket

• Why insurance and maintenance are in there:
  A small payment does not help if the premium eats you alive or the car nickels-and-dimes you. Total monthly strain matters more than the finance manager’s first payment quote.
• Remaining monthly budget:
  Take-home minus the bills you listed (housing, other debt, savings, other) minus that same car bundle. If it is red, gross-income rules are not saving you from a tight month.

What amortization means for affordability

• Longer term, softer payment:
  More months usually mean a lower payment for the same price, so the calculator may say you can "afford" a higher sticker. You also pay more interest over time and can stay underwater longer, so the term you pick moves the price cap a lot.
• Higher payment on purpose:
  Shorter loans often mean a bigger monthly hit but less interest overall and faster equity. Some people pay extra toward principal for the same reason. That only works if you still have room in the rest of your life after the car.
• Amortization schedule:
  If you are torn between 60 and 72 months or thinking about paying ahead, an amortization table shows how much of each payment is interest vs. principal.

Sales tax and what you borrow (check your state)

• Loan amount in plain terms:
  Roughly: what you still owe on the car after trade-in, plus tax on the taxable part, minus your cash down. If that math goes zero or negative, we treat the loan as zero for this exercise.
• Fees and extras:
  We do not bake in doc fees, registration, or warranties. If those get folded into the loan, assume your real limit is a bit below the number on the screen.

When your old numbers stop working

• Good times to refresh:
  New job, new rent or mortgage, different paycheck schedule, or real insurance quotes on the actual trim you want.
• If you live in a spreadsheet:
  Drop the monthly car bundle from this tool next to groceries, fun money, and savings and see what you would cut before you let the total car share of gross creep toward that 20% comparison line.