A bank statement loan handles irregular income by averaging lumpy project payments over the full lookback, so empty months and large deposits even out. A 12 or 24 month window keeps one big payment from setting the figure. Gaps between jobs are expected, but long ones invite questions, and a lender may want a contract that shows the next payment.
How does a bank statement loan average irregular income?
A bank statement loan averages irregular income the same way it averages steady income: qualifying deposits over the whole lookback, after exclusions and the expense factor, divided by the number of months. The method does not change. What changes is how much the result depends on which months are in the window.
Irregular income is money that arrives in uneven amounts at uneven times. A builder paid at milestones, a consultant paid per engagement, a film crew member paid per production, or a sales agent paid on closings all have it. Some months bring a large check. Others bring nothing.
Why lenders accept it
A lender cares whether the yearly income covers twelve mortgage payments. A borrower who earns $180,000 in four payments can carry the same loan as one who earns $15,000 a month, if they hold the cash between payments. The average captures the first part. The balances on the statements show the second.
Why lenders worry about it
Irregular income is harder to forecast. Fannie Mae's general income information describes a stable and predictable flow of income as a foundational element of underwriting. A bank statement lender has its own guidelines, but the same worry applies: with a few large payments, losing one client or one project changes the year.
Lumpy project deposits across the lookback window
The lookback window is the span of months a lender reads. For lumpy project deposits, it decides whether the average is fair. A short window can hold two large payments or none. A 12 or 24 month window holds enough projects that the average stops depending on where one deposit happened to land.
Three months is nearly useless
Three months of a project business may contain one payment, two or none. The average swings by tens of thousands of dollars depending on the start date. Few lenders will qualify irregular income on so short a span, and a broker should not quote from one.
Twelve months is the usual floor
Twelve months usually contains several projects, so the average reflects the borrower's pace of work. It still depends on timing at the edges. A payment that landed a week before the window opened is gone. One that lands a week after the window closes is not yet counted.
Twenty-four months smooths the edges
Two years of statements holds twice as many projects and halves the effect of an edge payment. It also shows whether the pace is steady, rising or slowing. For a borrower with few, large payments, a 24 month lookback is often the safer choice even if the 12 month figure is higher.
A contractor's irregular deposits across one year
A worked example shows how far the average moves with the window. The borrower is a fictional renovation contractor paid at project milestones into a business account. The figures are qualifying deposits after transfers and loans came out. They are invented for illustration, and the 35 percent expense factor is an example only.
| Month | Example qualifying deposits |
|---|---|
| January | $0 |
| February | $42,000 |
| March | $2,500 |
| April | $0 |
| May | $0 |
| June | $61,000 |
| July | $4,000 |
| August | $1,500 |
| September | $38,000 |
| October | $0 |
| November | $3,000 |
| December | $28,000 |
| 12 month total | $180,000 |
Averages from the same year
- 12 months. $180,000 over 12 is $15,000 a month in deposits. After a 35 percent factor, monthly income is $9,750.
- Last 6 months, July to December. $74,500 over six is about $12,417 a month.
- First 6 months, January to June. $105,500 over six is about $17,583 a month.
- April to June. $61,000 over three is about $20,333 a month.
- October to December. $31,000 over three is about $10,333 a month.
The three month figures differ by about $10,000 a month on the same borrower in the same year. The 12 month figure is the only defensible one. A 24 month lookback would tell the lender whether this year was typical.
What the balances add
Look at the account's month-end balances between payments. If the balance drops steadily through April and May but never runs out, the borrower budgets for the gaps. If it hits zero before the June payment and shows overdraft fees, the gaps are a risk the average hides.
Gaps between jobs in irregular statement income
Gaps between jobs are months with little or no qualifying income. In irregular statement income, a few are expected and do not hurt the average much on their own. A long gap, or gaps that are getting longer, can raise a continuance question: is the work drying up?
Short gaps
One or two empty months between projects are normal for a project business. An underwriter who sees a steady pattern of payments followed by gaps will read it as the rhythm of the work. A short note from the borrower that names the projects and their payment schedules helps.
Long gaps
A gap of several months, particularly at the end of the lookback, is harder. The lender cannot tell whether the next project is coming. This is where a contract, a signed bid or an invoice issued but not yet paid makes the difference.
Other income during a gap
Some borrowers have a part-time job, rental income or benefits that fill the gaps. Those may help, but each income type has its own rules. If part of it is nontaxable, a lender may adjust it before adding it in. How lenders gross up nontaxable income explains that adjustment. A borrower with a salaried job alongside the projects is a different case, covered in combining W2 and self-employed income.
When do lenders want a contract for irregular income?
Lenders want a contract for irregular income when the average depends on a few large payments, when the most recent months are thin, or when one client supplies most of the deposits. The contract shows the next payment is coming. Lenders differ on how often they ask, so the matrix and the underwriter decide.
What a useful contract shows
- The client's name and the borrower's business name.
- The scope and total value of the work.
- The payment schedule, with amounts and dates or milestones.
- Signatures from both parties and the date signed.
Contracts that add little
Not every document helps. A contract for work already paid in full proves past income the statements already show. An unsigned proposal proves nothing about the client's intent. A contract with no dates or milestones leaves the lender unable to tell when money will arrive. Before sending one, read it as the underwriter will: does it show a payment that has not yet landed, from a named client, on a schedule that falls within the next year? If not, a letter from the client confirming ongoing work may serve better.
Repeat clients without contracts
Many small project businesses work on handshakes with clients they have served for years. Statements that show the same payer across both years of a 24 month lookback make a quiet case for continuance, even without paper.
Checking the client
A lender may want to know the paying client is a real business, especially when one large payer dominates the statements. Business identity checks of this kind are standard on the commercial side. KYB verification for lenders covers what those checks confirm and which records they draw on.
Irregular income errors with large project deposits
Irregular income errors are mistakes in handling large project deposits that push the qualifying figure too high or too low. The two most common are opposite: removing a large deposit as a one-time item when it is ordinary project income, and annualizing a short stretch that happened to include a big payment.
Treating a project payment as one-time
Large deposits get extra scrutiny, and a reviewer may exclude one as unusual. For a project business, a large deposit is the business. Excluding it understates income badly. The answer is evidence that it was earned: an invoice, a contract or a pattern of similar payments. Average monthly deposits covers how lenders sort one-time credits from ordinary ones.
Annualizing a hot streak
Three months that hold two large payments make a borrower look richer than they are. If a lender's program allows a short window, the broker should still check the 12 month figure, so the quote does not depend on timing.
Missing the costs that ride with the payment
A contractor's project payment often includes money for materials and subcontractors that leaves the account within days. The expense factor is meant to cover that, but if the costs are unusually high for the business type, the factor will overstate income. Read the debits after each large deposit.
TrueBankFlow flags large and out-of-pattern deposits with their date and statement line, and lets the reviewer include or exclude each one with the average recalculated on the spot, so a project payment can be kept with a note rather than lost. To try it on a project-based borrower, get started with TrueBankFlow.