A 12 month bank statement loan qualifies a borrower on one year of deposits, while a 24 month program averages two years. The 12 month loan gives more income when deposits are rising, and the 24 month loan gives more when the latest year was weaker. Pricing and eligibility also differ by lender.
What changes between a 12 month bank statement loan and 24 months?
Three things change: the number of statements the borrower provides, the divisor in the income calculation, and the way recent months weigh on the result. A 12 month program uses the latest year alone. A 24 month program blends two years into one average.
The rest of the file is the same. The deposits are still sorted into qualifying and excluded, the expense factor is still applied to business accounts, and the underwriter still wants every page. What moves is the window.
The practical differences
- Documents. 12 statements per account against 24. The 24 month file is twice as long to collect and to review.
- Account history. A borrower with an account open for 14 months can use a 12 month program and cannot use a 24 month one.
- Income. Depends on the trend, as the next section shows.
- Risk view. A longer window shows how the borrower behaved through a slow period. A shorter one shows only the most recent year.
- Pricing and availability. Some lenders price the two programs differently, and some offer only one. Their sheets decide.
A note on terms
A lookback is the number of months of statements the lender averages. The divisor is that same number. Programs also exist at other lengths, such as three months for certain loan types, which are covered in the short lookback guide.
The calculation that sits under both options is the same one explained in the income calculation from deposits to monthly income, so this post compares outcomes instead of repeating the steps.
Rising deposits favor a 12 month bank statement loan
A rising deposit pattern favors a 12 month bank statement loan because the latest year is the larger one. A 24 month average mixes in the smaller first year, which lowers the figure. The faster the growth, the bigger the gap between the two answers.
The reverse is also true. Twelve months of data cannot make a falling borrower look better than the full two years.
A side-by-side calculation
The figures are an example for a borrower whose deposits grew 30 percent from year one to year two. It assumes a 50 percent expense factor and no excluded deposits, to keep the arithmetic clear.
| 12 month lookback | 24 month lookback | |
|---|---|---|
| Deposits, year one | not used | $120,000 |
| Deposits, year two | $156,000 | $156,000 |
| Total deposits used | $156,000 | $276,000 |
| After 50% expense factor | $78,000 | $138,000 |
| Divisor | 12 | 24 |
| Qualifying monthly income | $6,500 | $5,750 |
Year two is 30 percent above year one ($120,000 times 1.3 is $156,000). The 12 month result is $750 a month higher, which is about 13 percent. For a borrower stretching to qualify for a particular loan amount, that gap can decide whether the file works.
Why the difference is larger than it looks
The monthly deposits in year two average $13,000, and in year one, $10,000. The 24 month average is $11,500, halfway between. A borrower still growing at the end of year two earns more than that average right now. The 12 month program credits that growth. The 24 month program discounts it.
What the lender checks
A lender who takes the 12 month figure also looks at whether the growth is real. A steady climb is easy to accept. One big month near the end that lifts the whole year is not. Look at the monthly figures before you pick, and sort out any large deposit using the guidance in average monthly deposits.
Pricing differences on a 12 month bank statement loan
Pricing on a 12 month bank statement loan can differ from the 24 month version, since lenders view a shorter history as less proof of stable income. Some add to the rate or cut the maximum loan to value. Others price the two the same. The rate sheet answers it, not a rule.
The reason for any difference is risk. Twelve months show a year. Twenty-four show how the borrower handled changes in the business. A lender can charge for the thinner evidence, limit leverage, or ask for more reserves.
Where a gap can appear
- Rate. An adjustment in the rate or the points for the shorter lookback.
- Loan to value. A lower maximum on the 12 month program.
- Reserves. A larger required cushion of months of payments.
- Loan size. A lower cap on the amount.
- Credit score floor. A higher minimum for the shorter program.
None of these is guaranteed. Some lenders publish no difference. The only reliable method is to price the same borrower on both programs from the lender's current sheet.
Weighing price against income
A higher income can win even when the rate is higher, if the borrower otherwise cannot qualify. The comparison is the monthly payment at the loan amount and rate on each program, set against the income each program credits. A $750 a month income gap, as in the example above, may be worth more than a small rate adjustment, or not.
Credit score and loan to value adjustments to bank statement loan rates cover how those factors move the price, which helps separate what the lookback costs from what the credit profile costs.
Do not choose on rate alone
A lower rate on the 24 month program is no help if the income does not support the loan. Qualify first, then compare price among the programs the borrower can qualify for.
When does a 12 month lookback hide a bad year?
A 12 month lookback hides a bad year when the weak year falls outside the window. If the borrower had a poor year two years ago and a strong year recently, the 12 month figure shows only the good one. A 24 month view shows both.
This is not a flaw in the program. It is the design. A 12 month program is intended for a borrower whose recent year is the best guide to current income. But some underwriters want to see the earlier year, and some borrowers have a recent year that is the outlier.
Signs the recent year is the outlier
- A one-time surge from a large contract that has ended.
- A recovery from a bad year, where the strong year is a rebound to the earlier level.
- A seasonal business whose last 12 months ended on its peak.
- Deposits concentrated in a few months or from a single payer.
A contrasting example
The figures are invented. A borrower had $150,000 of qualifying deposits in year one and $90,000 in year two, with a 50 percent factor. The 12 month result is $90,000 times 50 percent divided by 12, or $3,750 a month. The 24 month result is $240,000 times 50 percent divided by 24, or $5,000 a month.
In that case the 24 month program gives more income, and it also tells a truer story of the borrower's earning power. The decline is part of the file either way, and an underwriter may use the lower recent figure even on a 24 month program, as described in how declining deposits change verified income.
What a broker should do
Look at the monthly trend before choosing. A broker who sees the weak year can prepare the explanation. A broker who does not may find out from the underwriter. The goal is no surprise.
Running both 12 and 24 month statement calculations
Run both calculations on every file where the borrower has 24 months of statements. The extra work is small, and it shows which program gives the higher income, which one the lender's trend rules might undercut, and which the borrower should apply for.
Doing this by hand means two sets of monthly totals, two averages and two expense-factor passes. It takes time, and the risk is that the exclusions in one are not carried to the other.
A method that keeps the two aligned
- Build one monthly table of total, excluded and qualifying deposits for all 24 months.
- Make the exclusion decisions once, on the full table.
- Sum the latest 12 rows for the 12 month figure and all 24 rows for the 24 month figure.
- Apply the same expense factor to both.
- Divide by 12 and 24.
- Compare the two results and the trend between the years.
Because the exclusions are decided once, the two programs are compared on the same basis.
What to compare beyond income
Check the two results against the qualifying payment, the pricing from the lender's sheet and the documents each program needs. Also check whether the borrower has the account history for 24 months at all. The statements may rule out the longer option before any math is done.
TrueBankFlow reads 3, 6, 12 or 24 months of statements per account and lines them up month by month, with total and qualifying averages that recalculate as deposits are included or excluded. To try it, request a spot on the get started page.
Which to submit
Submit the program that qualifies the borrower with the most room and an acceptable price, and keep the other calculation in the file notes. If the underwriter asks about the weak year, the answer is ready. When a statement alone is enough as proof of income covers what else to pair with the numbers.