You can record a journal voucher for decrease in input tax.
1. Go to Gateway of Tally > Accounting Vouchers > F7: Journal .
Note: You can create a journal voucher from Gateway of Tally > Display > Statutory Reports > VAT > select the VAT or CST form.
2. Click J : Stat Adjustment . In the Stat Adjustment Details screen,
o Select the option VAT in the Type of duty/tax field.
o Select the option Decrease of Input Tax in the Nature of adjustment field.
o Press Enter to save, and return to voucher screen.
3. Debit the CST ledger.
o Enter the Rate and Assessable Value in the VAT Details screen.
o Press Enter to return to voucher screen.
4. Enter the amount in the Debit column.
5. Credit the VAT ledger.
o Enter the Rate and Assessable Value in the VAT Details screen.
o Press Enter to return to the voucher screen.
6. Set the option Provide VAT Details? to Yes and enter the From and To dates, else retain the option as No .
Note: The option Provide VAT Details is provided as per state specific requirements of VAT/CST forms and annexures. In this example, Bihar is selected as the State .
7. Enter Narration , if required. The journal voucher appears as shown below:
   
8. Press Enter to save.
The states with Decrease of Input Tax available as the Nature of Adjustment are given below:
| State Name | Nature of Adjustment | Additional Details | Voucher Entry | 
| Andhra Pradesh | Decrease of Input Tax | Against CST | Debit: CST ledger. Credit: VAT ledger. | 
| Assam | Decrease of Input Tax | Against CST | Debit: CST ledger. Credit: VAT ledger. | 
| Bihar | Decrease of Input Tax | Against CST | Debit: CST ledger. Credit: VAT ledger or ledger grouped under Current Liabilities . | 
| Chandigarh | Decrease of Input Tax | Against CST | Debit: CST ledger. Credit: VAT ledger. | 
| Tax Paid on Unsold Stock | Debit: Ledger grouped under Current Assets . Credit: VAT ledger. | ||
| Chhattisgarh | Decrease of Input Tax | Against CST | Debit: CST ledger. Credit: VAT ledger. | 
| Against CST of capital goods | Debit: CST ledger. Credit: VAT ledger. | ||
| Dadra and Nagar Haveli | Decrease of Input Tax | Against CST | Debit: CST ledger. Credit: VAT ledger/ledger grouped under Current Liabilities . | 
| Change in Use of Goods, for Purchase Other Than for Which Credit Allowed | Debit: Purchase ledger. Credit: VAT ledger. | ||
| Other Adjustments | Debit: Party Ledger. Credit: Purchase Ledger. Credit: VAT ledger. | ||
| Delhi | Decrease of Input Tax | Against CST | Debit: CST ledger. Credit: VAT ledger. | 
| Change in Use of Goods, for Purchase Other Than for Which Credit Allowed | Debit: Purchase ledger. Credit: VAT ledger. | ||
| Other Adjustments | Debit: Party/expenses ledger. Debit: VAT ledger. Credit: Purchase ledger. | ||
| Goa | Decrease of Input Tax | Against CST | Debit: CST ledger. Credit: VAT ledger. | 
| Set Off Against Excess ITC Under Goa Sales Tax Act | Debit: Expenses ledger. Credit: VAT ledger. | ||
| Set Off Against Excess ITC Under Goa Tax on Entry of Goods Act | Debit: Expenses ledger. Credit: VAT ledger. | ||
| Set Off Against Excess ITC Under Goa VAT Act | Debit: Expenses ledger. Credit: VAT ledger. | ||
| Gujarat | Decrease of Input Tax | Against CST | Debit: CST ledger. Credit: VAT ledger. Credit: Additional tax ledger. | 
| Haryana | Decrease of Input Tax | Against CST | Debit: CST ledger. Credit: VAT ledger. | 
| Himachal Pradesh | Decrease of Input Tax | Against CST | Debit: CST ledger. Credit: VAT ledger. | 
| Tax Paid on Unsold Stock | Debit: Ledger grouped under Current Assets . Credit: VAT ledger. | ||
| Jammu and Kashmir | Decrease of Input Tax | Against CST | Debit: CST ledger. Credit: VAT ledger. | 
| Jharkhand | Decrease of Input Tax | Against CST | Debit: CST ledger. Credit: VAT ledger. | 
| Madhya Pradesh | Decrease of Input Tax | Against CST | Debit: CST ledger. Credit: VAT ledger. | 
| Maharashtra | Decrease of Input Tax | Against CST | Debit: CST ledger. Credit: VAT ledger. | 
| Other Purchase Adjustment | Debit: Expenses ledger. Credit: CST ledger. | ||
| Other Purchase Adjustment (Capital Assets) | Debit: Expenses ledger. Credit: CST ledger. | ||
| Odisha | Decrease of Input Tax | Against CST | Debit: CST ledger. Credit: VAT ledger. | 
| Credit note issued to buyer (excess VAT in sales) | Debit: Party ledger. Credit: VAT ledger. | ||
| Puducherry | Decrease of Input Tax | Against CST | Debit: CST ledger. Credit: VAT ledger. | 
| Change in Use of Goods, for Purchase Other Than for Which Credit Allowed | Debit: Purchase/expense ledger. Credit: VAT ledger. | ||
| Other Adjustments | Debit: Party/cash ledger. Credit: Purchase ledger. Credit: VAT ledger. | ||
| Punjab | Decrease of Input Tax | Against CST | Debit: CST ledger. Debit: Surcharge ledger. Credit: VAT ledger. Credit: Surcharge ledger. | 
| Tax not charged by the seller | Debit: VAT ledger. Debit: Surcharge ledger. Credit: VAT ledger. Credit: Surcharge ledger. | ||
| Tamil Nadu | Decrease of Input Tax | Against CST | Debit: CST ledger. Credit: VAT ledger. | 
| Telangana | Decrease of Input Tax | Against CST | Debit: CST ledger. Credit: VAT ledger. | 
| Uttarakhand | Decrease of Input Tax | Against CST | Debit: CST ledger. Credit: VAT ledger or ledger grouped under Current Liabilities . | 
| Refund Claim | Debit: Refund claim ledger grouped under Current Assets . Credit: VAT ledger. | ||
| Uttar Pradesh | Decrease of Input Tax | Against CST | Debit: CST ledger. Credit: VAT ledger. | 
| West Bengal | Decrease of Input Tax | Against CST | Debit: CST ledger. Credit: VAT ledger. | 
| Excess Claimed Earlier | Debit: Purchases/expenses ledger. Credit: VAT ledger. |