GST-related errors in Tally Prime can create serious problems like:

• Wrong tax calculation

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• Mismatch in GSTR reports

• Rejected e-invoices

• Failed e-way bills

Most of these issues happen due to incorrect configuration, not software faults.

This guide explains the problem in simple language and helps you fix it.

What Do GST & Compliance Errors Mean?

Simple meaning:

✔ Tax values don’t match
✔ GST returns show incorrect data
✔ Portal rejects invoices/e-way bills

Common Errors Users See

• Incorrect GST amount

• HSN/SAC related errors

• Invalid GSTIN

• E-invoice rejection

• E-way bill failure

• Mismatch in GSTR-1 / GSTR-3B

Why Do These Errors Happen?

Think of GST setup like filling a form.

If details are wrong → Reports & filings become wrong.

Most common causes:

✔ Wrong GST rate selection
✔ Incorrect HSN / SAC code
✔ Wrong GSTIN of party
✔ Wrong tax ledger mapping
✔ Incorrect voucher type setup
✔ Duplicate / missing entries

✅ Step-by-Step Solutions

1️⃣ Check GST Rate Selection

Wrong rate = Wrong tax calculation.

Steps:

1. Open the voucher

2. Check tax rate applied

3. Confirm correct GST slab

✔ Example mistakes:

• 18% instead of 12%

• GST applied to exempt items

2️⃣ Verify HSN / SAC Codes

Incorrect codes cause portal rejection.

Steps:

1. Open Stock Item / Ledger

2. Check HSN/SAC field

3. Confirm valid & correct code

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✔ Missing HSN → Filing errors
✔ Wrong digits → Rejection

3️⃣ Check Party GSTIN

Incorrect GSTIN = Compliance failure.

Steps:

1. Open Party Ledger

2. Verify GSTIN carefully

✔ Common mistakes:

• Typing errors

• Wrong state GSTIN

• Using old GSTIN

4️⃣ Verify Tax Ledgers

Improper mapping affects reports.

✔ Ensure correct GST ledger selected
✔ Avoid mixing CGST/SGST/IGST wrongly

✔ Example:

? Interstate sale → IGST
? Intrastate sale → CGST + SGST

5️⃣ Review Voucher Entries

Mismatch often caused by entry errors.

✔ Wrong voucher type
✔ Duplicate invoices
✔ Incorrect taxable value

6️⃣ E-Invoice Rejection Fix

Common reasons:

✔ Correct entry → Generate again

7️⃣ E-Way Bill Errors

Common causes:

✔ Wrong transporter details
✔ Incorrect distance
✔ Missing vehicle number
✔ Invalid document value

⚠ Common Problems & Easy Fixes

? Important Precautions

✔ Never ignore GST mismatches
✔ Always verify before filing
✔ Avoid last-minute bulk corrections

✔ MOST IMPORTANT:

? Backup data before major corrections

✅ Best Practices for Error-Free GST

✔ Correct Setup From Beginning

✔ Accurate GST rates
✔ Valid HSN/SAC codes
✔ Proper ledger configuration

✔ Regular Reconciliation

✔ Compare books vs portal
✔ Identify mismatch early

✔ Validate Masters Carefully

✔ Party Ledgers
✔ Stock Items
✔ Tax Ledgers

✔ Avoid Manual Guesswork

✔ Confirm rates with accountant
✔ Use official GST references

✔ Periodic Review

✔ Check for missing/incorrect codes
✔ Verify tax classification

Short Conclusion

Most GST & compliance errors are caused by:

✔ Incorrect entries
✔ Wrong configuration
✔ Missing details

Careful setup + Regular checking = Smooth GST Filing

If unsure → Consult GST professional / accountant.