Tally data corruption is a critical issue that can disrupt accounting operations, GST compliance, payroll processing, and audits. Corruption may occur due to system crashes, improper shutdowns, disk errors, malware, or network interruptions.
This Knowledge Base article provides a structured, professional guide to identify Tally data corruption and perform safe, step-by-step recovery, minimizing data loss and downtime.
Tally stores company data in numeric data folders (e.g., 10000, 10001) within the configured data path. Corruption occurs when:
Data files are partially written
Index files are damaged
File locks are broken during active sessions
Storage media develops bad sectors
Corruption may affect:
One company
Multiple companies
Entire Tally data directory
Tally crashes while loading company
Error message: “Data is corrupted”
Company not appearing in company list
GST reports not opening
Tally closing unexpectedly
Migration to new system fails
Audit data inaccessible
Tally hangs on Loading Company
Error during Rewrite
Incomplete balances or missing vouchers
GST reports showing blank or incorrect data
Company opens but reports do not
Close Tally on all systems
Ensure no background Tally processes are running
Disconnect users if Tally is on LAN
✔ Prevents further data damage
Before any recovery attempt:
Go to Tally data folder (example):
C:\TallyPrime\Data\
Copy the entire data folder
Store it on:
External HDD
USB drive
Separate system
⚠️ Never attempt repair without backup
Open Tally
Select Company
Highlight corrupted company
Press:
Confirm Rewrite
✔ Repairs index-level corruption
✖ May not recover severely damaged data
If rewrite fails or data is inconsistent:
Open Tally
Go to:
Select latest healthy backup
Restore to new data location
Verify balances and vouchers
Use when Tally does not list the company:
Close Tally
Navigate to backup data folder
Identify company folder (e.g., 10000)
Copy it to active data path
Reopen Tally and load company
✔ Useful when company list is blank
✖ Requires careful folder handling
Run disk check to avoid recurrence:
Reboot system after completion.
| Issue | Cause | Fix |
|---|---|---|
| Rewrite fails | Severe corruption | Restore from backup |
| Company missing | Folder damaged | Manual restore |
| GST data incorrect | Partial index damage | Rewrite + recompute |
| Frequent corruption | Disk errors | Replace HDD / move to SSD |
| Corruption after power cut | No UPS | Install UPS |
| LAN-based corruption | Network drop | Use single-user mode |
Scan system for malware/ransomware
Restrict write access to data folder
Avoid sharing data folder over unstable networks
Encrypt backups
Disable unauthorized USB access
Maintain audit logs
Enable automatic Tally backups
Maintain daily + offline backups
Store data on SSD instead of HDD
Use UPS to prevent abrupt shutdowns
Avoid multi-user access over weak LAN
Close Tally properly before shutdown
Periodically test backup restoration
Keep antivirus exclusions for Tally data path
Tally data corruption can be serious but is often recoverable if handled correctly. Immediate backup, controlled rewrite, and disciplined restore procedures significantly reduce data loss. A strong backup strategy and stable system environment are the best defenses against future corruption.
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