Advance Tax Due Dates Calendar in Pakistan — All Four Quarters Explained

Advance income tax under Section 147 of the Income Tax Ordinance is not a once-a-year event. It falls in four installments spread across the tax year, and each one has its own calculation and its own paperwork. Most business owners only think about advance tax when a reminder lands in their inbox — by then it is often too close to the deadline to plan properly. This guide lays out the full quarterly calendar so you know, well in advance, what is coming and when.

Why Advance Tax Is Split Into Four Installments

The logic behind advance tax is straightforward: instead of collecting an entire year's income tax in one lump sum after the year has closed, FBR collects it gradually, in step with the year as it unfolds. This smooths cash flow for the government and, in principle, for the taxpayer too — paying a quarter of your estimated liability every few months is usually easier to manage than one large payment at year-end.

For a business, this also means advance tax is not a single "tax season" event the way the annual return is. It recurs four times, and each occurrence needs its own attention.

The Four Quarterly Windows

The tax year in Pakistan runs from 1 July to 30 June, and advance tax is generally structured around four roughly equal periods within it — one falling in the September window, one in December, one in March, and one in June. Companies and individuals/AOPs can have slightly different due-date conventions within these broad windows, and the exact calendar date can be adjusted by FBR from year to year.

What to Prepare Before Each Installment

Regardless of the exact calendar date, the preparation work before each installment is largely the same:

• A current estimate of the year's likely turnover or income, updated with whatever actual figures are available so far.
• Any tax already withheld or paid in earlier quarters, since this is typically credited against the year's total advance tax liability.
• Confirmation of which computation method applies to your business (turnover-based estimate versus the prior year's assessed tax, where relevant).
• A PSID generated and payment made before the due date, not on it — bank processing and portal load near deadlines can cause delays.

Companies vs Individuals and AOPs

Companies are typically required to estimate and pay advance tax based on a turnover-linked formula tied to the immediately preceding tax year's results, adjusted quarterly. Individuals and AOPs (other than those specifically excluded) follow a related but not identical mechanism. The practical difference for a business owner is this: if you operate through a company, your advance tax computation each quarter draws on your company's own turnover trend; if you file as an individual or AOP, the computation basis can differ, and it is worth confirming which regime applies to your specific structure at the start of the tax year rather than assuming.

What Happens If a Quarter Is Missed

Missing a single installment does not erase the obligation — it usually carries forward with a default surcharge attached, and the missed amount still needs to be accounted for eventually. We cover the mechanics of a missed December installment specifically in a separate guide, but the general principle holds for any quarter: catching up sooner rather than waiting for the next installment date keeps the surcharge from compounding further.

Building the Calendar Into Your Business Routine

Businesses that handle advance tax smoothly tend to do one simple thing: they treat the four dates as fixed calendar commitments, the same way they treat salary payments or rent. A short internal reminder two to three weeks before each installment — giving enough time to gather figures, compute the estimate, and generate the PSID — removes almost all of the last-minute pressure that causes late or rushed payments.

Common Mistakes Around the Quarterly Calendar

A few patterns show up repeatedly:

• Assuming last year's exact dates apply unchanged this year, without checking for any FBR revision.
• Leaving the estimate calculation until the day of the deadline, when bank or portal delays can push the payment past the due date.
• Not adjusting the estimate when the business has a materially better or worse quarter than expected.
• Forgetting that tax already withheld during the quarter (on contracts, imports, or other transactions) should generally be credited against the installment, not paid again in full.

Who Inside a Business Should Own This Calendar

In a small business, advance tax often falls into a gap between the owner (who is busy running operations) and the accounts person (who may not have visibility into the full-year income picture needed to build a proper estimate). The result is that no one really owns the quarterly calendar until a deadline is nearly missed. Assigning clear ownership — whether that is an internal finance person or an external consultant — for gathering the figures, computing the estimate, and confirming the payment before each date removes this gap. It does not need to be complicated; it simply needs to be someone's explicit responsibility rather than everyone's vague awareness.

A Quick Note on the PSID Payment Step Itself

Each installment is paid against a PSID (Payment Slip ID) generated through IRIS, which is then used to pay via bank, ATM, or online banking. A PSID has its own validity window, and generating it does not itself constitute payment — the bank transaction still needs to be completed and it needs enough time to reflect in FBR's system before the deadline. Businesses that generate the PSID a day before the deadline and then find a bank queue or an online banking delay on the day itself are, functionally, still late even though they intended to pay on time. Building in a two-to-three-day buffer between generating the PSID and the actual deadline avoids this entirely avoidable risk.

How the Quarterly Calendar Connects to the Annual Return

It is worth keeping in mind that the four quarterly installments are not a self-contained obligation separate from your annual return — they are advance payments against the liability that return will ultimately compute. A business that has tracked its four installments accurately across the year walks into annual return preparation with a clean, reconciled position. A business that has treated each quarter as an isolated, disconnected event often finds annual return season becomes the point where all the quarter's small inconsistencies surface at once, in a much more time-pressured window.

Setting Up Your Own Calendar, Step by Step

If you would rather manage this yourself before deciding whether to hand it to a consultant, the setup is straightforward: mark the four approximate windows on your business calendar at the start of each tax year, add a reminder two to three weeks ahead of each one rather than on the date itself, and create a simple recurring checklist — pull year-to-date figures, confirm the computation basis, compute the estimate, generate the PSID, confirm payment, file the record. The specific exact dates for the current tax year should still be verified on FBR's portal each time, since a self-managed calendar built once and never re-checked against official dates is itself a source of missed or mistimed payments.

Frequently Asked Questions