Tally data corrupted? A calm, step-by-step repair and recovery guide

Sources: Tally Solutions' repair company data page (updated 22 July 2026), data corruption FAQ and scheduled backup page, checked 6 October 2026 against TallyPrime 7.1.

First 5 minutes: copy the folder, change nothing

Every repair or restore writes to disk. If it goes wrong on your only copy, there is nothing left to try again with. So the first job isn't fixing anything. It's freezing the damage where it is and making a copy you never touch.

Pick the error you're seeing, where the data lives and how recent your last backup is. The checklist below changes to match, in the order we'd work through it. Tick items off as you go.

Where is the company folder?

Open TallyPrime's Gateway and press F1 (Help) › About. Under Data Information, Location of Company data shows the folder TallyPrime is using. Inside it, each company is a numbered folder: six digits (such as 100000) from TallyPrime 3.0 onwards, five digits (such as 10000) for Tally.ERP 9 and TallyPrime 2.1 or earlier. The files inside end in .1800, or .900 for older data, according to Tally's data migration and corruption FAQ. Copy that whole numbered folder, with TallyPrime closed. Picking out single files gives you a copy that doesn't match itself.

Tally data not opening? Read the error first

"Corrupted" gets used for any company that won't open, but several common messages have nothing to do with damaged books. Matching the exact wording saves you from repairing data that was never broken. Here are the messages Tally documents, what each usually means and Tally's first move:

Summarised from Tally Solutions' data management errors and resolutions and data corruption FAQ, both updated 4 February 2026.

If TallyPrime only feels slow or hangs on a shared folder, without an error, that's usually a network problem rather than corruption. Our guide to Tally slow in network covers those fixes.

Repair on a copy, or restore a backup

Once your "as found" copy is safe on another drive, you have two routes back: repair the damaged company, or restore a backup. When you have a recent backup, do both. Repair the damaged company, restore the backup into a separate folder, then compare and keep the more complete one.

TallyPrime's built-in Repair, step by step

These steps follow Tally's repair company data page, which we re-checked on 6 October 2026. Your untouched copy is your safety net, and TallyPrime takes its own backup before repairing as well.

1. Save and back up. Tally asks you to save any unsaved vouchers or masters and back up to a local drive or TallyDrive first.
2. Open Repair any one of three ways: Alt+Y (Data) › Repair; F1 (Help) › Troubleshooting › Repair; or Ctrl+Alt+R at the Gateway of Tally.
3. Choose the company that shows the error.
4. Keep "Backup Company Data before Repair" on Yes and point the backup at a different disk if you can. If space is short, TallyPrime tells you how much free space it needs.
5. Press R and wait. The time depends on the size of the data and how badly it's damaged.
6. Read the Statistics report. From release 3.0, TallyPrime compares voucher and master counts before and after. Alt+F5 switches between detailed and condensed views, and Alt+X opens the Repair Exceptions report if anything couldn't be fixed. Release 2.1 and earlier skip the report and load the company directly.
7. Check the books, not just the screen. Look at the Trial Balance, the Day Book for the last few working days and the stock summary, and compare sales with the GST returns you've filed.

If Repair fails: the zero command rewrite

For stubborn damage, Tally documents a forced repair called the zero command. You start TallyPrime from the Windows Run box, giving it the path to tally.exe, the path to your data folder (the one that holds the numbered company folders) and a 0. Use your own paths from F1 › About; the ones below are examples only.

# Windows key › type Run › Enter, then type:
"C:\Program Files\TallyPrime\tally.exe" "D:\TallyData" 0
✓ TallyPrime opens in Zero Command mode
# choose the company › press R (Repair)

Take a backup before you run it. If the zero command fails too, Tally's guidance is to upgrade to the latest release (7.1 at the time of writing) and then contact Tally Support.

Restore a backup without overwriting anything

In TallyPrime 7.0 and later, restore from Alt+Y (Data) › Backup & Restore › Restore; in 6.2 and earlier, it's Alt+Y › Restore. The step that matters most is the first one.

1. Set the Restore Data Path to a new, empty folder, such as D:\TallyRestore, not your live data folder.
2. Pick the source: a local folder or drive, or TallyDrive if you use it.
3. Choose the company and the version. Versions are listed by date and time, newest first.
4. Press Ctrl+A. Enter the backup password, Recovery Key or TallyVault password if asked.
5. Open the restored company and compare it with the repaired one, then re-enter anything posted after the backup time.

Recovery without a backup: options and risks

Without a backup you have fewer options, and none of them is guaranteed. Work through them in this order, and always on copies:

1. Repair, then the zero command. Both are described above, and both are free. Many "corrupted" companies open again at this stage.
2. Look for a backup you've forgotten. Search every drive, pen drive and e-mail for files starting TBK, TDBK or TSDBK. Check TallyDrive on the Restore screen if your TSS is active, and ask your CA, who may hold a copy from the last audit or return. If Windows File History or restore points were switched on, the data folder's Properties › Previous Versions tab may hold an older copy.
3. Ask Tally Support or your Tally partner. Send the photo of the error, your release and what you've already tried.
4. Consider a data-recovery specialist only for what's left. This is the right call when a disk has physically failed. It means handing your complete books to an outsider, results aren't guaranteed, and you should get a diagnosis before you pay for recovery. If a disk clicks or isn't detected, stop powering it on.
5. Rebuild the gap. Masters such as ledgers and stock items often survive when vouchers don't. Sales bills, purchase invoices, bank statements and the returns you've filed on the GST portal give you what you need to re-post the rest.

Two limits are worth knowing up front. Tally's FAQ says data damaged by malware "cannot be recovered" unless a backup exists, and an Error Code 0 company whose transactions file is 1 KB has nothing left for any tool to repair.

• Don't keep posting entries "just for today" in a company that has shown an error.
• Don't run repeated repairs, or different TallyPrime releases, on the original folder.
• Don't install or run recovery software on the disk you're trying to recover from.
• Don't plug a backup drive into a computer you suspect is infected.

What corrupts Tally data

Tally's repair page names glitches, sudden system crashes, unauthorised access and invalid entries as triggers. In everyday offices, the same few causes come up again and again, and nearly all of them interrupt or interfere with TallyPrime while it is writing:

Factories and godowns see more of this than most offices. Frequent power cuts, dust and shared shop-floor PCs are a hard place for a database to live. That's one reason to consider keeping the books off the premises, and our page on Tally for manufacturing companies shows how that works for a factory, its office and its CA.

Prevention: Auto Backup, UPS and daily snapshots

You can't make corruption impossible, but you can make it boring: a short interruption and a restore, not lost months. Here's what to put in place, whether TallyPrime stays on your PC or moves to a server.

On your own PC or office network

1. Turn on Auto Backup (TallyPrime 7.0 and later). Alt+Y › Backup & Restore › Schedule Backup › Alt+A. Daily and incremental are the defaults, keeping 7 restorable versions (you can set 1 to 366). Tally recommends two schedules, one to TallyDrive and one to a local drive, and the PC must be on and awake at backup time. Our Tally data backup guide has every step.
2. Put a UPS on every computer that holds company data, with enough runtime for users to save and close TallyPrime.
3. Keep live data on the internal disk. No USB drives, no synced folders. Let sync apps copy only finished backup files.
4. Add Tally's antivirus exclusions: the data folder, Tally.exe, Tallyadmin.exe, *.tsf and *.1800 (*.900 for older data), per Tally's performance checklist.
5. On a network, disable Offline Files for the shared data folder and put the PCs that post vouchers on cables.
6. Stay on a current release (TallyPrime 7.1 at the time of writing), which is also Tally's advice when repairs keep failing.
7. Run a restore drill each month: restore last week's backup into an empty folder, open it and check the Trial Balance.

What a cloud server changes, and what it doesn't

Most of the causes above exist because company data sits on an office PC or travels across an office network. On a cloud server, TallyPrime and the data are on the same machine in a data centre. You see TallyPrime's screen over Remote Desktop, so if your power or internet drops, your screen disconnects but nothing interrupts TallyPrime writing to its disk. Here's an honest comparison with a TallyoCloud server in Mumbai:

The last row matters: a cloud server doesn't stop a person making a mistake. What it changes is the recovery. You send TallyoCloud support the company and the time to go back to, and we restore into a separate folder, never over live data, so you can check it before switching. Our page on is Tally on Cloud safe explains each layer, and the guide to moving Tally data to the cloud covers how your repaired company gets onto a private Tally cloud server. You can try it for 7 days first.

Companies: a daily backup in India is the law

If your business is a company, a corrupted company with no recent backup is a compliance problem as well as a bookkeeping one. The Companies (Accounts) Rules, 2014, as amended in August 2022 (summary on SCC Online), require a backup of books kept electronically to be kept on servers physically located in India on a daily basis, and the company must give the Registrar its service provider's name, IP address and location each year. TallyoCloud keeps servers and backups in India and gives company customers a provider-details letter and a daily backup log. The companies rule section of our backup guide explains which backup methods meet it. Proprietorships, partnerships and LLPs aren't covered by these rules, but should still back up daily. Check your own obligations with your CA.

Sources

Menus, error messages and limits on this page come from Tally Solutions' help pages, checked on 6 October 2026 against TallyPrime 7.1:

• Repair company data in TallyPrime, TallyHelp, updated 22 July 2026
• Data management errors and resolutions, TallyHelp, updated 4 February 2026
• Data migration and data corruption FAQ, TallyHelp, updated 4 February 2026
• Restore backup data, TallyHelp, updated 22 May 2026
• Back up to a local drive and schedule backups and backup and restore in TallyPrime, TallyHelp
• Checklist for troubleshooting performance issues (antivirus exclusions), TallyHelp
• Companies (Accounts) Fourth Amendment Rules, 2022 (G.S.R. 624(E)), via SCC Online and the ICAI Navi Mumbai branch

TallyPrime, TallyDrive, Tally.ERP 9 and Tally.NET are trademarks of Tally Solutions Pvt. Ltd. TallyoCloud is an independent hosting provider and is not affiliated with Tally Solutions. This guide is general information, not legal or data-recovery advice.

Frequently asked questions