How Bank Statement Income is Calculated

Understanding the methodology lenders use to calculate qualifying income from your bank statements

Bank statement income calculation determines how much you can borrow. Unlike traditional mortgages where income comes directly from tax returns, bank statement lenders derive your income from deposit activity.

The Basic Formula

Eligible Deposits − Expense Adjustment = Qualifying Income

1. Add up all eligible deposits over the statement period (12 or 24 months)
2. Subtract ineligible deposits (transfers, loans, gifts, etc.)
3. Apply an expense factor if using business statements
4. Divide by the number of months to get average monthly income

Example Calculation

A borrower submits 12 months of business bank statements showing $600,000 in total deposits. The lender identifies $50,000 as ineligible transfers and applies a 50% expense factor.

Step	Calculation
Total deposits	$600,000
Less ineligible deposits	−$50,000
Net eligible deposits	$550,000
Less 50% expense factor	−$275,000
Adjusted annual income	$275,000
Monthly qualifying income	$22,916

Personal vs Business Statements

Personal bank statements typically use a low expense factor (0-10%) since deposits are assumed to be after-expense income.

Business bank statements use higher expense factors (30-50%) because revenue includes money that goes toward operating costs.

What Counts as a Deposit

Eligible: Business revenue, client payments, accounts receivable, regular income patterns.

Ineligible: Transfers between your own accounts, loan proceeds, gift funds, tax refunds, one-time asset sales, insurance claims.

Large or irregular deposits require explanation and documentation.

Expense Factors by Business Type

Business Type	Typical Expense Factor
Professional services / consulting	10-30%
Real estate agents	20-40%
Contractors / tradespeople	30-50%
Retail / restaurants	40-60%

Providing a CPA letter or profit and loss statement may allow a lower expense factor, increasing your qualifying income.

Maximizing Your Qualifying Income

• Use the statement period (12 vs 24 months) that shows higher average deposits
• Ensure all legitimate income flows through the accounts you’re submitting
• Minimize account-to-account transfers that get flagged as ineligible
• Provide documentation to justify a lower expense factor
• Shop lenders—calculation methodology varies and small differences add up