FBR Tax Filing for Small Businesses in Pakistan: Step-by-Step 2026

FBR tax compliance is the biggest pain point for Pakistani SMEs. This guide explains each major tax obligation — Sales Tax, Income Tax, Withholding Tax — and how good bookkeeping in FinovaOS makes filing season a lot less painful. Filing itself still happens on IRIS with your tax consultant; FinovaOS's job is to keep your numbers clean and pullable.

Understanding Pakistan's Main Business Taxes

• ✓Sales Tax (GST): Collected from customers on taxable sales and remitted monthly via IRIS
• ✓Withholding Tax (WHT): Deducted on payments to suppliers — rates vary by vendor category
• ✓Income Tax on Salary: Deducted from employees per FBR slabs and deposited with FBR
• ✓Advance Income Tax: Paid quarterly by registered companies
• ✓Corporate Tax: Paid annually based on net profit

Step 1: Register on FBR IRIS

Go to iris.fbr.gov.pk and register your business. You'll receive an NTN (National Tax Number) and STRN (Sales Tax Registration Number) if applicable. Store these in FinovaOS Company Settings so they appear on all tax-relevant invoices.

Step 2: Configure Tax Codes in FinovaOS

In Settings → Tax, set up your sales tax rates (typically 17% or 18%) and any WHT rates you commonly apply. Every invoice and expense you record afterwards can be tagged with the right tax code, so the tax data is captured at source rather than reconstructed at month end.

Step 3: Monthly Sales Tax Data

At month end, run the Sales Tax report in FinovaOS. It shows every taxable sale, tax collected, and net payable — grouped by tax code. Export it to Excel or PDF and hand it to your tax consultant for the IRIS ST-3 filing. FinovaOS gives you the numbers; the IRIS submission itself is done on the FBR portal.

Step 4: Withholding Tax Register

When you record a supplier payment, note the WHT amount as a deduction line. Run the Withholding Tax register monthly to get a full supplier-wise breakdown for your accountant to file on IRIS.

Step 5: Annual Accounts for the Income Tax Return

FinovaOS's Balance Sheet, Profit & Loss, and Cash Flow are ready to hand off to your tax consultant for your annual income tax return. Because everything ties back to individual transactions in FinovaOS, your consultant can drill down whenever the FBR asks a question.