Commission Income: History, Stability, and Mortgage Qualification

Commission pay can vary with sales volume, client demand, territory, season, or employer compensation plans. Two borrowers with the same job title may have very different income patterns. For mortgage qualification, the lender needs to establish what the borrower actually earns, whether that pattern is reasonably stable, and what portion is likely to continue after closing.

Identify the compensation structure

A borrower may receive a fixed salary plus commissions, or may be paid primarily through commissions. Some employers deduct business expenses from gross commissions; others reimburse those expenses separately. The underwriter needs to understand the pay arrangement before calculating monthly income. A year-end W-2 total may not by itself distinguish base salary, commission, and bonus components.

Fannie Mae’s current Selling Guide groups commission with other employment-related variable income. It generally recommends a two-year history, while allowing 12 to 24 months in some cases when positive factors support the shorter period. This is an investor standard, not a universal federal rule. A lender may apply a stricter overlay, while other loan programs have their own documentation requirements.

Build a defensible monthly figure

For a stable two-year pattern, a basic illustration is to divide eligible commissions from the period by the number of months represented. If verified commission was $48,000 over 24 months, the historical average is $2,000 monthly. The underwriter then compares current year-to-date earnings and employer information to decide whether $2,000 remains supportable. If commissions were paid irregularly, a monthly average can smooth the timing, but it does not erase a downward trend.

Consider a borrower who earned $60,000 in year one and $36,000 in year two. A 24-month arithmetic mean is $4,000 per month. If the current year is tracking at $2,000 per month after a territory change, using the two-year average without explanation would overstate the likely income. The lender may use the lower current trend, request a clear employer explanation, or determine that the income is too uncertain to count.

The reverse can also occur: a borrower moved into a stronger territory and current earnings have risen. The lender still needs evidence that the higher amount is repeatable, not just one large sale. Documentation may include current pay statements, year-end earnings summaries, W-2s, and verification of employment. Exact documents depend on the loan program and lender policy.

Account for unreimbursed expenses

Some commission jobs require the employee to pay for travel, licensing, supplies, or other business costs. If those expenses are not reimbursed, they may reduce the income available for qualification under the applicable guide. Tax returns, employer statements, or other records can help identify the amounts. The originator should not count gross commissions as if the borrower keeps every dollar when the documents show recurring costs necessary to earn them.

Do not confuse tax deductions with the lender’s calculation. A business expense can be treated differently depending on whether the borrower is a W-2 employee, an independent contractor, or self-employed. If a commission-based borrower receives a 1099 and files business schedules, the analysis may move into self-employment income rules rather than ordinary wage-earner treatment.

Changes that can alter the analysis

A new employer, new sales territory, shift from salary to commission, reduced product demand, or compensation-plan revision can change the expected income. Document the date and details. A job change does not automatically invalidate income, especially when the borrower stays in the same occupation, but the lender must evaluate whether the new structure provides enough evidence of stability.

If the borrower has multiple commission jobs, analyze each source separately. A side business or occasional referral payment may not meet the requirements for stable employment income. Similarly, a commission advance may be repayable against future earnings and should not be mistaken for additional pay. Clear documentation prevents the loan file from treating temporary cash flow as recurring income.

The originator’s role

A loan originator gathers complete, accurate information and explains what documents the lender needs. The originator should not guarantee a qualifying monthly amount before underwriting completes. If a borrower asks whether a commission plan counts, describe the review process and avoid giving a definitive answer until the lender has evaluated history, expenses, and continuance.

When a commission amount is used, make the application and supporting documents consistent. If the income figure differs from the simple average, the file should explain why—for example, a documented declining trend or a permitted shorter history. Transparent math helps a reviewer trace the conclusion and helps the borrower understand why the approved amount differs from gross pay.

A compact commission calculation example

Assume a borrower has a regular two-year commission history of $42,000 and $54,000, with current year-to-date commissions of $27,000 over six months. A lender would compare the historical record with the current pace and determine whether the income is stable or rising under the current guide; it should not simply add the amounts and divide by 30 without checking what months and periods the figures represent. If current commissions are earned at a regular monthly rate, the YTD amount corresponds to $4,500 a month, which can be compared with the prior years’ monthly figures.

This kind of calculation is a diagnostic, not a substitute for a lender’s policy. The file should identify whether a bonus is included in the commission total, whether an annual payment is prorated, and whether year-to-date pay reflects a complete period. Keeping those components separate makes it easier to explain a trend and reproduce the qualifying figure later.

Quick review checklist

• Determine whether commissions are paid with salary, as the main wage, or through self-employment.
• Compare a representative history with current earnings and any employer plan change.
• Consider unreimbursed expenses where required by the applicable guide.
• Use an average only when it reflects a stable, continuing pattern.
• Keep program rules distinct: Fannie Mae guidance is not automatically the FHA, VA, USDA, or Freddie Mac rule.