Sales tax calculation: the rate is the hard part
Every sales tax calculator does the same arithmetic correctly. The reason businesses get sales tax wrong is not multiplication — it is applying a rate that does not belong to the supply in front of them.
Step one: which regime
| What you supply | Regime | Standard rate |
|---|---|---|
| Goods | Sales Tax Act 1990, administered by FBR | 18% |
| Services rendered in Punjab | Punjab Revenue Authority | 16% |
| Services rendered in Sindh | Sindh Revenue Board | 15% |
| Services rendered in Khyber Pakhtunkhwa | KP Revenue Authority | 15% |
| Services rendered in Balochistan | Balochistan Revenue Authority | 15% |
Telecommunication services are taxed higher, generally at 19.5%, across most jurisdictions. If you are a services business defaulting to 18% because that is the rate everyone quotes, you are over-charging your customers and remitting to the wrong authority — see the federal-provincial fork.
Step two: which schedule entry
Within a regime, the standard rate is a residual. Before applying it, check whether the supply has its own treatment:
- Exempt — outside the charge, and related input tax generally not recoverable.
- Zero-rated — taxable at nil, with input tax generally recoverable. Export of goods is the main example.
- Reduced rate — notified categories, frequently with input tax recovery restricted as the trade-off.
- Special or fixed rate — specified goods and sectors with their own entry.
- Standard rate — everything not otherwise provided for.
We settle the taxable value, apportion input tax and file monthly with the right federal or provincial authority.
Avail our sales tax servicesStep three: the value of supply
The percentage is applied to the value of supply as the statute defines it, which is not always the figure you were expecting:
- Imported goods — the base commonly includes customs duty and other levies payable at import, not just the invoice price.
- Related-party supplies — where the price is not at arm length, an open market value can apply.
- Supplies with additional charges — delivery, handling and similar amounts may form part of the value.
- Discounts — treatment depends on whether the discount is shown on the invoice and given at the time of supply.
- Supplies in kind or part-exchange — value has to be established rather than taken from a cash figure that does not exist.
Worked, across three supplies
| Supply | Regime and rate | On Rs 500,000 net |
|---|---|---|
| Machinery sold to a Karachi factory | Federal goods, 18% | Rs 90,000 tax; Rs 590,000 gross |
| Installation service performed in Lahore | PRA, 16% | Rs 80,000 tax; Rs 580,000 gross |
| Maintenance service performed in Karachi | SRB, 15% | Rs 75,000 tax; Rs 575,000 gross |
Same value, three different taxes, three different authorities, three separate monthly returns. A supplier invoicing all three at 18% under one federal registration has three problems at once — over-collection on two lines, remittance to an authority without jurisdiction, and an unregistered exposure in two provinces.
Mixed invoices and the blended-rate trap
Two provisions decide every calculation on this page. Section 3 of the Sales Tax Act 1990 imposes the tax and fixes the rate, and section 2(46) defines the value of supply it is charged on. Almost every dispute about a sales tax figure is a dispute about the second, not the first — the rate is published and rarely contested; what the tax is charged on is where the argument sits.
An invoice covering supplies at different rates, or covering both goods and services, needs a rate per line. Businesses routinely apply one figure to the total because the accounting system was configured that way, and the consequences run in three directions at once:
- You over-collect on some lines and under-collect on others, neither of which is correct.
- Your customer cannot cleanly evidence input tax against a line whose rate does not match the supply described.
- Your return does not reconcile to a sales register that shows a single blended figure.
The fix is at configuration rather than at invoicing: set up separate item or service codes carrying their own rate and regime, so the correct treatment is applied when the line is entered rather than remembered by whoever raises the invoice. That also makes the monthly reconciliation and the annexures fall out of the system rather than being assembled by hand — filing the return.
The checks to run before quoting
- Identify the supply precisely, as it will appear on the invoice.
- Determine goods or services, and for services the place of provision.
- Find the schedule entry in the applicable law and note the rate attached to it.
- Confirm the entry is current — schedules move through Finance Acts and notifications.
- Establish the value of supply on the statutory basis.
- Agree the pricing basis in writing — tax inclusive or exclusive — before quoting.
- Record the entry relied on and the date checked, so the position can be defended without redoing the analysis.
That last step takes seconds and saves hours. A rate decision with no recorded basis is one you will have to reconstruct under a notice — sales tax audit preparation.
Sources
This guide is written against the official and clearly labelled professional references below. Rates, thresholds and portal procedures change between reviews, so open the primary source before relying on a figure.
- Sales Tax Act 1990, amended through 30 June 2026 (FBR)
- Sales Tax Basics (FBR)
- Punjab Revenue Authority sales tax guidance
- Sindh Revenue Board
Questions people also ask
Is sales tax in Pakistan always 18 percent?
No. 18% is the standard federal rate on goods under the Sales Tax Act 1990. Services are provincial — 16% in Punjab, generally 15% in Sindh, Khyber Pakhtunkhwa and Balochistan — telecom is taxed higher, and reduced rates apply to notified categories. A calculator defaulting to 18% is right for a large share of goods supplies and wrong for most services.
My supplier and I disagree on the rate. How do we resolve it?
Neither of you decides it — the schedule entry for the specific supply does. Identify what is actually being supplied, find the entry that describes it in the applicable law, and apply the rate attached to that entry. Where the supply does not clearly match an entry, that is a question for a written clarification rather than a negotiation between the parties.
Do I calculate on the price before or after other taxes and duties?
The value of supply for sales tax purposes is defined by statute and it is not always the invoice line you expect. For imported goods in particular, the base commonly includes customs duty and other levies. Establish the correct value of supply before applying a percentage, because starting from the wrong base makes the rate irrelevant.
Can I use one rate across a mixed invoice?
No. Where an invoice covers supplies attracting different rates, or covers both goods and services falling under different regimes, each line needs its own rate. An averaged or blended rate is wrong on every line rather than right on any, and it also makes your customer input tax claim harder to evidence.
What rate applies to something not listed anywhere?
A supply that does not fall within an exemption, a zero-rating or a specific rate entry generally attracts the standard rate for its regime. But "I could not find it" is not the same as "it is not there" — the schedules are detailed and category descriptions are often not the words a business would use. Search on what the supply is rather than on what you call it.
Send the tax year and the transaction or filing involved, and we will tell you what is actually required.
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