Advance Tax on Import — How It's Different From the Quarterly Business Installment

A business that imports goods regularly deals with two separate things that both get called "advance tax" — the quarterly Section 147 installment, and tax collected at the time of import. Treating these as the same obligation, or forgetting to reconcile one against the other, is a common source of confusion for import-heavy businesses.

Two Separate Collection Mechanisms

Section 147 quarterly advance tax is collected on a calendar basis — four installments spread through the tax year, based on an estimate of the year's income or turnover. Advance tax on imports is collected transaction by transaction, at the point goods are cleared through customs, based on the value of that specific shipment. A business could clear ten import shipments in a single quarter, each one having tax withheld at customs, entirely separate from whatever the quarterly Section 147 installment for that quarter comes to.

How the Two Amounts Interact

Tax collected at import is generally treated as tax paid on account of the importer's overall income tax liability for the year — meaning it becomes a credit, not an additional, unrelated tax. When the annual return is filed, the total tax collected on imports throughout the year is added to whatever was paid through the quarterly Section 147 installments, and the combined figure is set against the year's final assessed liability.

Why Tracking Import Collections Matters for Your Quarterly Estimate

A business that ignores its import-stage collections when estimating its quarterly advance tax risks over-paying — effectively paying twice for the same underlying tax liability, once at customs and again through an unadjusted quarterly estimate. Keeping a running total of tax collected at import throughout the year, and factoring it into each quarter's advance tax estimate, avoids this.

Documentation to Keep

• Customs clearance documents (Goods Declaration) showing the tax collected on each shipment.
• A running summary, updated at least quarterly, of total import tax collected to date in the tax year.
• Bank records confirming the payments, in case reconciliation is ever questioned.

Whether Import Tax Is Final or Adjustable

Whether tax collected at import is treated as a final tax or as an adjustable advance depends on the nature of the goods and the importer's status — some categories of imports are subject to final-tax treatment, meaning no further adjustment is due on that specific transaction, while others remain fully adjustable against the year's overall liability. This distinction matters for how the two systems reconcile and is worth confirming for your specific import category rather than assuming one treatment applies across the board.

Reconciling Several Shipments Within One Quarter

An import-heavy business rarely clears just one shipment per quarter, and each shipment's customs documentation is a separate record. Before each quarterly advance tax due date, it is worth pulling together every Goods Declaration cleared since the last installment and totalling the tax collected across all of them — not just the most recent or largest shipment, which can understate the actual cumulative credit available. A simple running spreadsheet, updated as each shipment clears, avoids having to reconstruct this from scratch under time pressure right before a due date.

A Brief Note for Businesses That Both Import and Export

Businesses that both import raw materials or goods and export finished products deal with two different collection points that should not be confused with each other — tax collected at import on incoming goods, and any distinct treatment applicable to export proceeds on the other side of the business. Each needs to be tracked and reconciled on its own terms, and neither substitutes for the other when it comes to building the quarterly Section 147 estimate.

What Happens When Import Volume Changes Significantly

A business that sharply increases or decreases its import volume from one quarter to the next will see a corresponding change in tax collected at customs — which, in turn, should feed into a revised advance tax estimate for that quarter rather than being reconciled only at year-end. This is one of the more common, concrete triggers for the kind of mid-year estimate revision covered in our related guide, and import-heavy businesses in particular should treat a significant volume change as a cue to revisit the quarterly figure.

Currency Fluctuation and the Timing of Import Tax Collection

Because import tax is calculated on the value of a shipment at the time of clearance, exchange rate movements between when an order is placed and when it actually clears customs can affect the tax collected on a given shipment, independent of anything the business itself has changed. This is simply a feature of how import valuation works, not something to try to plan around, but it is worth understanding when comparing tax collected across shipments of similar physical quantity that cleared customs at different points in time and at different exchange rates.

Different Categories of Goods Are Not Always Treated Identically

Not every category of imported goods is treated identically for advance tax purposes — the applicable treatment can vary depending on whether the goods are raw materials for further manufacturing, finished goods for resale, machinery, or other classifications. A business importing more than one category of goods should confirm the treatment separately for each, rather than assuming a single blanket rule covers everything that comes through customs under the same importer's name.

The Role of Your Clearing Agent in Getting This Right

Your customs clearing agent handles the mechanics of each shipment's clearance, including the tax collected at that point, but they are not necessarily positioned to advise on how that collection should feed into your broader quarterly Section 147 estimate — that connection is a tax planning question, not a customs clearance one. Treating the clearing agent's paperwork as the input to your tax planning, rather than expecting the clearing agent to do the tax planning itself, keeps the two roles appropriately separated.

How Kamboh Associates Helps

For import-heavy businesses, we build the quarterly advance tax estimate with your import collections already factored in, so you are not overpaying by treating the two systems as unrelated. We also help confirm whether your specific import category is subject to final or adjustable treatment.

Frequently Asked Questions