The QuickBooks .TLG File and How It Recovers Your Latest Transactions

Last reviewed 2026-09-22

A crash, a power cut, or a forced restart during data entry can leave a QuickBooks company file damaged. The transactions you entered since the last backup look lost along with it. Desktop editions of QuickBooks quietly keep a second record of that work, and knowing about it beforehand changes how a recovery goes.

What is the .TLG file?

The .TLG file is a companion that QuickBooks Desktop keeps beside your .QBW company file, in the same folder and under the same name. It records every transaction written since the last full backup made inside QuickBooks. You cannot open it or read it yourself. Its value appears only when the .QBW is damaged or lost.

When does QuickBooks create the log?

QuickBooks creates the transaction log when a company file is used in multi-user mode or when Automatic Data Recovery is active for the file. On editions that support Automatic Data Recovery, that is the normal state, so most company files have a log sitting next to them. The log grows as you work and is trimmed back each time you create a full backup inside QuickBooks. A very large .TLG beside a modest .QBW is a quiet signal that real backups are overdue.

Think twice before renaming or deleting the log

Plenty of troubleshooting steps for -6000 series errors tell you to rename the .TLG file, and the step is legitimate. A mismatched log can cause errors of its own. The danger is timing: once the log is renamed, every transaction recorded since the last backup exists nowhere else. Rename rather than delete, keep the renamed file until the company file passes Verify, and never take the step without a known-good backup in hand.

Restoring a backup replays the log

Restoring the most recent .QBB backup is the usual first move after damage. The restore alone returns you to the day that backup was made. If the matching .TLG sits in the same folder as the restored company file, QuickBooks can apply the recorded entries and bring the file current to the moment the log stopped. Automatic Data Recovery keeps its own copies plus a rolling set of logs, so recovery to within a few hours of a failure is often realistic.

One caution: copying the .QBW in Windows Explorer is not a backup. The copy travels without its log, and the original log can only ever be paired with the original file.

If QuickBooks cannot open the company file

When the .QBW fails Verify and Rebuild, or refuses to open at all, QuickBooks cannot replay the log itself. The log is still worth a great deal. Our engineers can extract transactions directly from a .TLG and fold them into a repaired or restored company file, which is often the difference between losing an afternoon and losing a month of entries. That is exactly the case our QuickBooks TLG recovery service exists for. If no log exists at all, QuickBooks data recovery for a file that will not open covers the repair side of the problem.

Make the log useful before you need it

Open your company file today and create a full backup from the File menu, then confirm the .TLG sits beside the .QBW in its folder. Restore that backup once as a test. Ten minutes now, while the file is healthy, beats any hour spent recovering without a safety net.