Frost Bank positive pay file: process and how to build one
Frost Bank offers Positive Pay as a free fraud-prevention service that you pair with its Account Reconciliation products. The mechanism is the same one every bank uses: you send Frost a list of the checks you have issued, Frost matches checks presented for payment against that list, and anything that does not match becomes an exception you review and pay or return. The file you send is called a check issue file. This page explains what Frost expects, where to find Frost's own specification, and how to produce a matching file from your accounting records.
How Frost Bank positive pay works
On its treasury management pages, Frost describes Positive Pay as "a service offered for free that intercepts potentially fraudulent checks before they are paid." It is sold alongside Account Reconciliation, which comes in several flavors: Full Reconciliation, Partial Reconciliation, Site Reconciliation, and an All-Items Report. Frost compares your issued check file with its records, then provides paid, outstanding, and stale-item reporting. Payee Review (often called payee positive pay) is available so Frost can also check the payee name on the check, not just the check number and amount.
The workflow looks like this:
- You write or print checks and record them in your accounting system.
- You upload a check issue file to Frost listing each check's number, amount, issue date, account, and (for payee review) payee name.
- When a check is presented, Frost matches it against your list.
- Mismatches surface as exceptions. You decide pay or return before Frost's daily cutoff. Unresolved items follow your default decision once the cutoff passes.
The piece you control, and the piece this tool helps with, is step two: turning your check register into a correctly formatted file.
The .PAY.FIL convention and Frost's file spec
Frost's check issue files commonly use a .PAY.FIL naming convention. This shows up in third-party documentation: accounting and reporting vendors describe an export that produces a check-issue file (named with a *PAY.FIL pattern) for Frost positive pay customers who are not using Frost's own ReadyLink software. Those formats organize records with a File Control Record and a user-specified Batch ID (BID) field used to flag the transmittal as new data, replacement data, and similar.
That tells you two things. First, Frost has a defined, fixed layout for the issue file. Second, the exact field positions are not something to guess at. We will not publish invented field offsets here, because getting one column wrong means Frost rejects the file or, worse, fails to match a legitimate check. The authoritative layout comes from Frost itself.
Where to get the real spec: ask your Frost treasury management or business banking contact for the positive pay / Account Reconciliation file format guide, or look inside Frost's online banking under the treasury or Account Reconciliation section. Frost's published Positive Pay materials confirm you "can request electronic paid item and outstanding check files," and the same treasury team that sets up your service will hand you the issue-file layout. If your service includes Payee Review, confirm whether the payee name field is required and how long it can be, since payee matching only works when that column is populated and sized correctly.
QuickBooks does not export this file
A common surprise: QuickBooks, whether Desktop or Online, does not export a positive pay file natively. It will print checks and show you a check register, but it has no built-in "positive pay" export that produces a bank-ready issue file. You have to extract the register and convert it into Frost's layout yourself, or use a tool that does the conversion. See our QuickBooks positive pay guide for the export-and-convert steps.
Build a Frost-ready file with PositivePayMaker
PositivePayMaker is a free, browser-based converter. You export your check register from QuickBooks, Xero, your ERP, or any spreadsheet as CSV or Excel, load it into the tool, map your columns to the fields Frost asks for, and download a file in the structure Frost specified. Because Frost's exact layout is bank-specific, you use the custom format builder to recreate it: set fixed-width column positions or delimited fields, the date format, how amounts are written (decimal or implied cents), zero-padding on check numbers, and whether to include header and trailer records like the File Control Record described above. Save that configuration once and reuse it every time you run a file.
If your Frost format turns out to be a plain delimited or fixed-width file, a generic CSV or fixed-width preset may get you most of the way before you fine-tune it. Everything runs locally in your browser. Your check data, account numbers, payee names, and amounts never leave your computer and are never uploaded to a server. There is no account to create and nothing to install.
Always verify the first file with Frost
Before you rely on any tool, including this one, validate the first file you generate against a small, known set of checks and confirm with Frost that it imported cleanly and matched correctly. Send one day's checks, watch how Frost processes them, and only then move your full volume over. A file that looks right but has the amount field off by a column will silently fail to match. You can run your output through our validator to catch obvious structural problems first, but Frost's own acceptance is the real test.
When a paid tool might fit instead
For most small businesses the free converter is enough. If you process very high check volumes, run multiple entities, or want vendor support and a library of prebuilt bank layouts, a paid desktop product may be worth the cost. Big Red Consulting's Positive Pay File Creator runs about $119 the first year and $99 a year after, is Windows-only, and its QuickBooks Online edition needs Excel installed. Treasury Software's Bank Positive Pay is an installed Windows product priced roughly $29.95 to $89.95 per month with a large catalog of bank layouts. MoneyThumb and ProperSoft also sell paid desktop converters. None of these are required to produce a Frost file, but they exist if you outgrow a free browser tool.
To start now, open the file builder and recreate your Frost layout with the custom format builder, then confirm the result with your Frost treasury contact.