If you run your own business, your tax return has one job. It lowers your tax bill. It does not try to impress a lender. Every write-off you claim is legal. Many are smart moves. But a lender looks at your net profit, the line left after every write-off. That number is often much smaller than what actually lands in your bank account.
A bank statement loan is built for that gap. Instead of two years of tax returns, the lender asks for 12 or 24 months of bank statements. It counts your deposits, not your net profit, as the starting point for your income. This loan type usually costs more than a standard loan. It also asks for a bigger down payment. So it is not a fit for everyone who is self-employed. It is a tool for one problem: your tax returns understate what you actually earn. This page is part of this site’s guide for self-employed borrowers.
How the deposit math works
A lender does not just add up every dollar in your account, since a business account also pays for real costs like payroll, supplies, and rent, and none of that is personal income. So the lender applies an expense factor, which is the share of your deposits the lender assumes are business costs, not income. The lender subtracts that share first, then counts what is left as your qualifying income.
Here is a simple example. Say a business deposits $20,000 a month. The lender applies a 50% expense factor, a level this kind of program often uses. The lender would then treat $10,000 a month as income to qualify with. Change the expense factor and that number moves too. Lenders set this factor file by file, based on the type of business and the records you show them. Two owners with the same deposits can end up with two different qualifying numbers.
What counts as income, side by side
| Full documentation loan | Bank statement loan | |
|---|---|---|
| Starting point | Net profit after write-offs. | Gross deposits. |
| What gets counted | Two years of tax returns, averaged. | 12 or 24 months of bank statements. |
| Main deduction | Whatever the tax return already shows. | An expense factor applied to deposits. |
| Best fit | Tax returns already show enough income. | Tax returns understate real income. |
A bank statement loan can show a higher income number than your tax return does. That is because it starts from deposits, not net profit after write-offs.
12 months versus 24 months
Most bank statement programs let you pick a 12-month or a 24-month lookback. A 12-month lookback is more forgiving of one slow stretch or a newer business. But it usually costs more, since the lender has less history to judge you by. A 24-month lookback asks for more paperwork and a longer track record. It tends to price better, because two years of deposits gives the lender a steadier pattern to check.
Why this loan is not on the Fannie Mae or Freddie Mac grid
Fannie Mae and Freddie Mac buy most conventional mortgages from lenders. Both define self-employment income through tax returns and net profit, not bank deposits. Their published guide has no bank statement path at all. A bank statement loan falls into a category called Non-QM. That stands for a loan that does not meet the Qualified Mortgage rule. Fannie Mae and Freddie Mac will not buy a Non-QM loan. So it gets sold to a different kind of investor, one willing to take on more risk for a higher return. That different buyer is a big reason this loan type usually costs more, not just the lender’s own choice.
Trade press has tracked how big this market has become. Non-QM lending is reported to be headed toward $175 billion in 2026. That is one sign this is a real, sized market, not a rare product. This figure comes from industry reporting, not a government count.
What a lender is actually checking
Past the deposit math, a lender wants to see that your deposits come from a real, ongoing business. Not a one-time windfall. Not a loan from family. Expect the lender to ask for your business name, its structure, and how long it has run. Some lenders also ask for a letter from your accountant confirming the business is still active. A large, unexplained deposit can slow your file down while the lender asks where the money came from. For the full list of paperwork a lender may request, see this site’s self-employed document checklist.
What this means for you
Before you assume you need this loan, check whether a full-documentation loan already works. On this site’s $320,000 example loan, at 6.5% with 1 point, principal and interest run about $2,023 a month. That number is illustrative, built from this example’s loan amount and rate, not a quote. A bank statement loan on the same amount would likely carry a different rate and a different down payment rule, both set by the lender pricing your file that day.
If your tax returns already show enough income, a full-documentation loan will almost always cost less. If you can wait a year and write off less before you apply, that path may open a cheaper loan too. A bank statement loan earns its cost only when neither choice is realistic and your bank deposits tell a truer story than your tax return. Read what it actually costs before you decide, and try the bank statement loan calculator to see how your own deposits and expense factor change the numbers.