M&T Bank Positive Pay: Creating Your Check Issue File

If you write business checks on an M&T Bank account and you've turned on positive pay, the bank expects you to send a list of every check you issue: the check number, the dollar amount, the issue date, and usually the payee name. M&T compares that list against checks presented for payment and flags anything that doesn't match. The file that carries your list is the part you have to produce, and that's where most people get stuck.

This page covers how M&T's positive pay works, where the file specification comes from, and how to turn your check register into a file the bank will accept without retyping anything by hand.

How positive pay works at M&T

M&T Bank offers positive pay through M&T Treasury Center, its online treasury management portal for business and commercial clients. The portal is where you run reporting, ACH, wires, and fraud controls in one place, and it's where your positive pay file gets uploaded.

M&T describes a few related products, and it helps to know which one you have:

For standard and payee positive pay, the daily routine is the same: you cut your checks, export or assemble a list, format that list to M&T's layout, and upload it to Treasury Center before the bank's cutoff. Checks that arrive without a matching issue record land in your exception queue.

Where the M&T file specification comes from

M&T does not publish a public, field-by-field positive pay file layout the way a few banks do. The exact format, whether it's comma-delimited or fixed-width, the column order, the date format, and whether a header or trailer row is required, is defined by M&T for your specific Treasury Center setup. You get it from one of these places:

There's a useful tell here. M&T's own integration material, including the Nota integration for law firm trust accounting, describes downloading a positive pay report that is "pre-formatted for M&T Treasury Center" and then uploading it. That confirms M&T standardizes a specific layout for the portal. Because we can't verify the exact byte positions of that layout from a public source, we won't print a fake one. Get the real map from M&T, then match it once. After that the work is repeatable.

Why QuickBooks alone won't get you there

QuickBooks Desktop and QuickBooks Online both let you print checks and run a check register report, but neither one exports a positive pay file in a bank's format. There's no "export positive pay" button. You can pull a register or a check detail report into CSV or Excel, but the columns won't line up with what M&T wants: the order is different, the date format is different, and the amount formatting (decimals, leading zeros, sign) is almost never what the bank expects. The gap between "a spreadsheet of my checks" and "a file M&T accepts" is the formatting step.

Build the M&T file with PositivePayMaker

PositivePayMaker is a free tool that runs entirely in your browser. You load your check register as a CSV or Excel file, map your columns to the fields M&T needs, and download a positive pay file in the layout you choose. Your check data never gets uploaded anywhere. The conversion happens on your own machine, in the page, which matters when the file contains every check number and amount on your account.

Because M&T's exact layout isn't published, the practical path is:

  1. Get the issued-check file specification from M&T Treasury Center or your treasury contact (delimiter, field order, date format, header/trailer requirements).
  2. Open the custom format builder and recreate that layout: pick CSV or fixed-width, set the field order and widths, and set the date and amount formatting to match the spec.
  3. Load your check register, map your columns once, and export. The builder remembers the layout so the next day's file is a few clicks.

PositivePayMaker ships with 11 bank layouts, six of them built from published specifications including Chase and Huntington, plus the custom builder for banks like M&T that hand you a private spec. There's also a file validator so you can check row counts, totals, and field alignment before you upload.

Always test the first file

Whatever you use to build the file, treat the first one as a test. Generate it, open it in a plain text editor to eyeball the field positions and the date and amount formatting, and upload it to M&T Treasury Center while you can still confirm the result. Better still, ask your M&T treasury contact to validate a sample before you rely on it for a live check run. A positive pay file that's off by one column or has the wrong date format won't error loudly. It'll quietly turn good checks into exceptions, which is the opposite of what you want.

When a paid desktop tool makes sense

If you process high volumes, want a tool that pulls directly from QuickBooks, or prefer phone support, a paid desktop product may fit better. Two established options:

Both are legitimate. The tradeoff is cost, a Windows install, and (for most positive pay tools) sending your check data through software that isn't browser-local. PositivePayMaker is free, runs in any browser, and keeps the data on your machine, which is why it's a reasonable starting point even if you later move to a paid tool.

For a step-by-step on getting check data out of QuickBooks, see the QuickBooks positive pay guide. For how issue files are structured in general, the positive pay file format reference walks through delimiters, fixed-width fields, and date handling.

Create your positive pay file