# Loan Origination System Integration for Statement Data - Author: TrueBankFlow (https://www.truebankflow.com) - Published: 2026-03-11 - Updated: 2026-03-11 - Category: Analysis software and reports - Canonical: https://www.truebankflow.com/blog/loan-origination-system-integration > What loan origination system integration means for bank statement analysis: data fields, document links, conditions and what to test with a vendor. Loan origination system integration, for bank statement analysis, means the deposit figures, flags and report from the analysis tool land in the right fields and folders of the LOS without retyping. A useful integration carries a handful of named numbers, links each one to its source statement, raises conditions from flags and updates when new statements arrive. ## What does loan origination system integration mean for statement analysis? For statement analysis, integration with a loan origination system (LOS) is the path that moves results from the analysis tool into the loan record. Three things travel: figures such as average monthly deposits, documents such as the underwriting report, and events such as a flag that should open a condition. Most lenders picture integration as one big connection. In practice it is three separate pipes, and a vendor can offer one without the others. Knowing which pipe you need keeps a sales call honest. ### The figures pipe The figures pipe writes numbers into LOS fields: the qualifying average, the lookback months, the account count, the NSF count. This is the part that saves typing. It is also the part that breaks quietly, because a number that lands in the wrong field looks just as valid as one that lands in the right field. ### The documents pipe The documents pipe files the report, and sometimes the statements themselves, into the loan's document folder with a name and a type the LOS understands. Without it, someone downloads a PDF and uploads it again by hand. ### The events pipe The events pipe turns something the analysis found into an action inside the LOS, such as a task for the processor or a condition for the borrower. This is the rarest pipe and the one that most changes daily work. ### Where the data standard fits Mortgage systems often exchange loan data in a shared format. The [MISMO standards and resources page](https://www.mismo.org/standards-resources) describes MISMO standards as providing "a common language for exchanging data and information across the mortgage finance industry." A vendor that maps its output to a standard your LOS already reads has less custom work to do. Business lending platforms vary more, so ask each vendor which format it writes rather than assuming one. ## Statement data fields an LOS integration should carry An LOS integration should carry the few figures an underwriter actually decides on, each with its period and source account. A short, exact list beats a long one. Every extra field is one more place a mapping can go wrong, and most LOS screens have room for only a summary. ### A field mapping table The table below is an example mapping. The LOS field names are placeholders, since every system names its fields differently. Build your own version with your LOS administrator before any vendor call. | Analysis output | Example value | Example LOS field | Why it matters | | --- | --- | --- | --- | | Average monthly qualifying deposits | 18,420.00 | Income: bank statement monthly | The number the income calculation starts from | | Average monthly total deposits | 21,905.00 | Notes or custom field | Shows how much was excluded | | Lookback months | 12 | Income: documentation period | Ties the average to the program rule | | Statement period covered | 2025-09-01 to 2026-08-31 | Custom field | Tells a reader how fresh the analysis is | | Accounts analyzed | 2 (ending 4471, 0918) | Assets or notes | Shows whether every account was read | | NSF and overdraft events | 3 | Custom field | Feeds overlays and knockouts | | Flagged deposits awaiting explanation | 2 | Task or condition count | Drives borrower requests | | Analysis date and analyst | 2026-09-04, J. Rivera | Audit fields | Shows who decided what and when | ### Fields that should not travel alone An average with no lookback is ambiguous. A 12-month average and a 24-month average for the same borrower can differ a lot, and a reader of the LOS screen cannot tell which one they are looking at unless the period travels with it. The same goes for an NSF count without its window. ### What a manual process already tracks If your team keeps these figures in a spreadsheet today, the sheet is a ready-made field list. The layout in [a cash flow analysis template for lenders](/blog/cash-flow-analysis-template-for-lenders) shows the rows most desks keep, and each row that an underwriter copies into the LOS is a candidate for the figures pipe. ## Document links between the LOS file and the analysis report A document link lets a reviewer move from a figure in the LOS to the report that produced it, and from the report to the statement line behind it. Without that chain, a quality control reviewer who doubts a number has to rebuild the analysis from the raw PDFs. ### Two links, not one The first link runs from the LOS to the report. That usually means the report is filed in the document folder under a predictable name, such as the borrower's last name, the words "bank statement analysis" and the analysis date. The second link runs from the report to the statements. TrueBankFlow builds this one into the report itself: every total links back to the statement lines behind it, and the export carries monthly totals, averages, flags and the reviewer's notes. A vendor that offers only the first link leaves the second gap open. ### Versions of the report Files change. A borrower sends a new month, or an underwriter excludes a deposit after a letter of explanation arrives. Each change produces a new report. The LOS should keep each version, clearly dated, and the field values should match the newest one. When the folder holds three reports with the same name, nobody knows which one the income field came from. ### Naming the statements themselves If the statements are filed separately, name them by account and period, not by upload order. "Checking 4471 2026-07" tells a reviewer what is inside. "Scan_003.pdf" does not. ## How do LOS conditions get raised from statement findings? LOS conditions should be raised from statement findings by a person, using flags the analysis produced as the starting list. A large deposit with no visible source, an NSF event or a missing page each suggests a condition. The underwriter decides which ones become borrower requests and words them. ### Flags that commonly become conditions - **An unexplained large deposit.** The condition asks for its source and, where the program requires it, a paper trail. - **A missing statement page or month.** The condition asks for the complete statement. - **NSF or overdraft events.** Some programs ask for a letter of explanation once events pass a count. - **An account that appears in transfers but was never provided.** The condition asks for that account's statements. ### Why automation should draft, not issue An events pipe can create a draft condition from a flag. It should not send that condition to the borrower on its own. Many flags clear on a second look: a large deposit turns out to be a transfer from a savings account already in the file, or a fee was refunded the next day. Sending every raw flag to a borrower produces a long list of requests, most of them unnecessary, and a borrower who stops answering. Which steps software can take on and which stay with a person is covered in more depth in [what automated bank statement analysis can and cannot do](/blog/automated-bank-statement-analysis). ### Rising deposits as a condition trigger A file where deposits climb sharply near the end of the lookback often draws a question even when no single deposit is large. The program rules for that pattern are explained in [bank statement loans with increasing deposits](/blog/bank-statement-loan-with-increasing-deposits). A trend figure in the LOS lets the underwriter see the pattern without opening every month. ## Report exports versus a live LOS connection A report export is a PDF or spreadsheet a person downloads and files. A live connection writes data into the LOS automatically. For a team running a modest number of files, a clean export with traceable figures is often enough, and it avoids months of integration work and a dependency on one vendor's connector. ### When an export is enough - Your team closes a modest number of statement files per month, so the filing step takes minutes, not hours. - Your LOS has few custom fields for statement data anyway, so a live feed would have little to write into. - You are still choosing a tool, and you do not want an integration project to lock in the choice. ### When a live connection earns its cost - Volume is high enough that retyping figures is a real share of processor time. - Rekeying errors have shown up in quality control findings. - Your rules engine reads LOS fields directly, so figures must be there before automated checks run. ### Where TrueBankFlow sits today TrueBankFlow is onboarding lending teams in small groups, and its homepage describes report exports rather than a connector to any named LOS: the Broker plan includes a PDF underwriting report, and the Lending team plan lists PDF and Excel reports. Treat that as an export workflow and plan your filing step around it. ### The build question Some lenders consider writing their own connection, or their own analysis. The trade-offs, including who maintains a connector when the LOS updates, are laid out in [build versus buy for bank statement analysis](/blog/build-vs-buy-bank-statement-analysis). ## Vendor test script for a loan origination system integration A vendor test script is a fixed list of steps you run in a test copy of your LOS before you sign, with an expected result for each. It turns "we integrate with your system" into something you can check. Run it on a real closed file whose numbers you already know. ### The script 1. **Pick a known file.** Choose a closed loan with two accounts and at least one excluded deposit. Write down the qualifying average, the lookback and the NSF count from your own records. 2. **Run the analysis.** Upload the same statements to the vendor's tool and finish the review, including the exclusion. 3. **Push to the test LOS.** Use whatever the vendor calls its sync or export step. 4. **Check every mapped field.** Compare each value against your written numbers. Note any field that is empty, rounded differently or placed in the wrong spot. 5. **Check the document folder.** Confirm the report is there, with a name and document type your processors will find. 6. **Follow a figure back.** From the report, trace the qualifying average to its statement lines. Time how long it takes. 7. **Change something.** Remove the exclusion, push again and confirm the LOS field updates and the old report is kept as a prior version. 8. **Add a month.** Upload one more statement, push again and confirm the period field moves. 9. **Break it on purpose.** Upload a statement with a missing page and confirm the push carries a flag, not a clean-looking average. 10. **Check permissions.** Confirm a user without access to the loan cannot see its analysis through the integration. ### Score it plainly Mark each step pass or fail. A failure on step 4 or step 9 is serious, because it means wrong or unchecked numbers can reach the LOS looking official. A failure on step 5 is an annoyance a processor can work around. ## LOS records left stale by updated bank statements A stale LOS record is one where the income field still shows the figure from the first analysis after newer statements or changes have been reviewed. It is the most common integration failure, because a first push usually works and the second push is rarely tested. ### How records go stale - **Updates are one-way and one-time.** The integration writes on first sync and never again. - **A person overrides the field.** An underwriter types a corrected value into the LOS, and the next push either overwrites it silently or is blocked silently. - **The new month goes to a new analysis.** A processor starts a fresh analysis for the updated statement instead of adding to the original, and the LOS points at the old one. ### How to catch it Add the analysis date and statement period to the LOS screen, next to the income figure. A reviewer who sees "period ending 2026-06-30" on a file with July and August statements in the folder knows something did not update. That one pair of fields catches most stale records without any further tooling. ### Decide who owns the number Write down which system holds the final figure. If the LOS value is the official one, the analysis tool feeds it and a person confirms it. If the analysis report is the official one, the LOS field is a copy and should say so. Either rule works. Having no rule is how two different income figures end up in the same file. When you are ready to see what the export looks like on one of your own files, you can [request early access to TrueBankFlow](/get-started).