How to Calculate Monthly Income for a GM Financial Auto Loan

What You Need Before You Start

Pull out your most recent pay stub. You need the one showing:

• Your gross earnings for the pay period (before taxes)
• Your YTD gross earnings (if you’re using YTD method)
• Your pay period end date

If you don’t have a pay stub, your employer’s HR system or payroll portal (ADP, Paychex, Workday, etc.) can provide one digitally.

Step 1: Identify Your Pay Frequency

Look at your pay stub header or your employer’s payment schedule to determine how often you’re paid:

Tip: Bi-weekly is the most common in the US. If you get a paycheck every other Friday, you’re bi-weekly.

Step 2: Find Your Gross Pay (Not Take-Home)

On your pay stub, locate the gross pay for this pay period — not your net pay.

What to look for on your stub:

Gross Earnings:      $2,400.00   ← Use THIS number
Federal Tax:          - $312.00
State Tax:             - $96.00
Social Security:      - $148.80
Medicare:              - $34.80
Health Insurance:      - $85.00
401(k):               - $96.00
─────────────────────────────────
Net Pay:             $1,627.40   ← NOT this number

The gross earnings line is always the largest number near the top.

Step 3: Apply the Conversion Formula

Use the correct formula for your pay frequency:

If you’re paid bi-weekly:

Monthly Income = Bi-Weekly Gross × 26 ÷ 12

Example: $2,400 × 26 ÷ 12 = $5,200/month

If you’re paid weekly:

Monthly Income = Weekly Gross × 52 ÷ 12

Example: $1,200 × 52 ÷ 12 = $5,200/month

If you’re paid semi-monthly (1st and 15th):

Monthly Income = Semi-Monthly Gross × 2

Example: $2,100 × 2 = $4,200/month

If you’re hourly:

Monthly Income = Hourly Rate × Hours Per Week × 52 ÷ 12

Example: $18.50/hr × 40 hrs × 52 ÷ 12 = $3,207/month

If you’re salaried (annual):

Monthly Income = Annual Salary ÷ 12

Example: $52,000 ÷ 12 = $4,333/month

Step 4: The YTD Method (If Your Income Varies)

For a complete YTD walkthrough with examples for each pay frequency, see How to Calculate YTD Income for GM Financial.

Use the YTD method if:

• Your income changes week to week (seasonal, commission-based, variable hours)
• A dealer asks for YTD verification
• You’re early in the year and regular pay stubs don’t tell the full story

Find these two numbers on your pay stub:

1. YTD Gross Earnings (e.g., $14,500)
2. Number of pay periods received this year (often shown as “Pay Period #” — e.g., 13th of 26)

Apply:

Monthly Income = (YTD ÷ Periods Received) × (Periods Per Year ÷ 12)

Example: $14,500 YTD, bi-weekly pay, 13 periods received:

= ($14,500 ÷ 13) × (26 ÷ 12)
= $1,115.38 × 2.1667
= $2,416/month

Step 5: Verify With the Calculator

Use the GM Income Calculator to double-check your math. Enter the same numbers — the result should match your manual calculation exactly.

The calculator also shows:

• Your maximum car payment at GM Financial’s preferred 15% PTI
• Your PTI ratio for any target payment you’re considering

Step 6: Prepare Your Proof of Income Documents

Once you know your monthly income, make sure you can document it. GM Financial typically requires the documents listed in GM Financial Income Verification Documents. Summary:

For salaried/hourly employees:

• Two most recent pay stubs
• Sometimes a W-2 from the previous year

For self-employed / 1099:

• Two years of tax returns (1040s)
• Recent bank statements showing consistent deposits

For other income sources (alimony, disability, rental):

• Award letter or court order
• Bank statements showing deposits

Dealer tip: Bring physical copies. Some dealers also accept photos or PDFs from payroll apps (ADP, Workday, etc.).

Common Scenarios

Scenario A: Two jobs

If you have two jobs, calculate monthly income from each separately and add them together. GM Financial can count both, provided you can document both with pay stubs.

Scenario B: Recent job change

If you started a new job recently, GM Financial may still approve you — especially if your new income is higher. Bring your current pay stub and be prepared to explain the job change.

Scenario C: Overtime

GM Financial may count consistent overtime if it’s documented over 24 months. If overtime is recent or inconsistent, it’s typically excluded. Calculate base pay only to be safe.

Scenario D: No pay stubs (cash income)

Without documentation, GM Financial cannot verify income. Bank statements showing regular deposits may be accepted in some cases, but approval becomes harder.

What Happens Next

Once you provide this figure to a GM Financial dealer:

1. The dealer enters your monthly income into GM Financial’s credit system
2. GM Financial calculates your PTI (car payment ÷ income) and DTI (all debts ÷ income)
3. Combined with your credit score and vehicle details, these determine approval, loan amount, and interest rate

For GM Financial’s specific income thresholds, see GM Financial Income Requirements: What You Need to Qualify.

For the complete formula reference, see GM Financial Income Formulas: All 7 Pay Types Explained.