Filing Monthly Sales Tax Returns in Pakistan on Iris 2.0 (2026)

Filing monthly sales tax returns in Pakistan on Iris is a mandatory compliance task for every business holding an active STRN. In 2026, the process follows a strict “10-15-18” timeline, meaning you must upload your sales data first before you can finalize your payment or submit the return. Because the Iris 2.0 portal now cross-references your “Input Tax” directly from your suppliers’ filings, you can only claim tax credits for purchases made from other active filers. Consequently, maintaining a clean monthly filing record is the only way to stay on the Active Taxpayer List (ATL) and avoid heavy penalties. By following the systematic workflow for filing monthly sales tax returns in Pakistan on Iris, you ensure your business remains legally compliant and financially efficient.

The 2026 Monthly Compliance Calendar

When filing monthly sales tax returns in Pakistan on Iris, you must adhere to three critical deadlines each month to avoid system lockouts.

• 10th of the Month: You must submit Annexure-C (Sales Invoices). This allows your buyers to see the “Input Tax” they can claim from you.
• 15th of the Month: You must generate the PSID and deposit the “Net Tax Payable” in the bank. The Iris 2.0 system requires a confirmed CPR (Challan Payment Receipt) to proceed.
• 18th of the Month: This is the final deadline to click “Submit” on the full STR-1 Return. Failing to hit submit by this date triggers an automatic late-filing penalty.

Navigating Annexures in Iris 2.0

The core of filing monthly sales tax returns in Pakistan on Iris involves populating specific data tables called Annexures.

1. Annexure-A (Purchases): You do not usually type this data manually. Instead, click “Load Data” to pull in all invoices uploaded by your suppliers. You must “Select” and “Accept” these entries to claim your input tax credit.
2. Annexure-C (Sales): You must enter every B2B and B2C sale made during the month. For 2026, ensure you include the buyer’s NTN for all business transactions to ensure they can claim the tax.
3. Annexure-F (Stock Statement): For manufacturers and retailers, you must reconcile your opening stock, monthly purchases, and sales to show the remaining inventory at the end of the month.
4. Annexure-I (Adustments): Use this section to record any debit or credit notes if goods were returned or prices were changed after the original invoice was issued.

How to File a “NIL” Return

Furthermore, filing monthly sales tax returns in Pakistan on Iris is mandatory even if you had zero business activity during the month.

• The Process: Select the tax period, leave all annexures blank, and click “Verify” followed by “Submit.”
• The Benefit: A NIL return costs nothing but keeps your status “Active” on the ATL.
• The Risk: If you skip a month, the FBR may “Blacklist” or “Suspend” your STRN. As a result, you will be unable to issue valid tax invoices to your clients until you pay a fine and file the missing returns.

2026 Sales Tax Penalty Architecture

Legal Assistance  

For professional legal guidance and support in Tax Matters, you may contact:

Mr. Osama Khalil
Lawyer & Legal Consultant
📞 Phone: 0316-1829946 
📧 Email: contact@osamakhalillaw.com | contact@khalilassociates.org