The big picture
A displayed share price is only one input to the amount paid or received. Commissions, permitted fees, statutory charges and transaction frictions affect the investor’s result. This topic teaches a reproducible cost ledger without inventing a universal JISPL tariff. Obtain the current signed schedule and applicable official rules before using any rate in a real calculation.
Core concepts
Learning objectives
- Read the base, rate and timing of each tariff item.
- Separate commission, transaction charges, tax on income and other deductions.
- Calculate a two-sided break-even under stated assumptions.
- Reconcile the estimate to the contract note and cash ledger.
Classify the cost before calculating it
1.1 Gross trade value and cash settlement
For Q shares at price P, gross traded value is Q multiplied by P. On a purchase, the cash requirement can exceed that amount; on a sale, cash received can be lower. The difference should be explained item by item. A commission may be quoted per share, as a percentage of traded value, or with a minimum under the applicable tariff. The wording determines the calculation.
1.2 Different deductions have different bases
Regulatory charges support market services; statutory taxes or duties arise under law. Tax on brokerage services may use the commission as its base rather than the entire trade value. Capital-gains tax concerns the applicable gain computation and must not be treated as an unexplained percentage of every sale. Custody, account or financing charges can be periodic rather than trade-specific. Classification prevents double counting.
Step-by-step method
- Record gross value before adding any charges.
- Identify the legal or contractual basis of each deduction.
- Keep transaction costs, periodic fees and taxes on income separately.
A cash debit exceeds purchase value. The learner builds a reconciliation from quantity and execution price to each charge instead of labelling the whole difference “CGT.” The correct explanation depends on the actual ledger and tariff.
Read the broker’s tariff as a calculation specification
2.1 Rates, floors and service scope
PSX’s investor-awareness material describes the need for a signed tariff schedule identifying commission and applicable regulatory and statutory levies. Ask for the current document rather than relying on an old advertisement or a general market article. Determine which account, market and service the rate covers, whether a minimum applies and which additional items are excluded.
2.2 Effective dates and supporting evidence
A rate can be numerically correct but applied to the wrong base or period. Check whether an amount is per order, executed trade, share, day, month or account. If the tariff uses a choice between a percentage and a per-share floor, reproduce the stated rule instead of adding both. Changes must be assessed under the agreement and operative requirements; keep the effective version used for each period.
Step-by-step method
- Obtain the current signed schedule and its effective date.
- Write each rate together with its base and minimum rule.
- Ask for written clarification of ambiguous or additional charges.
An investor compares two commission quotes. One includes a service charge while the other excludes it. A fair comparison first places both on the same quantity, trade value and included-service basis.
Calculate round-trip cost and break-even
3.1 Both sides of the trade matter
In a simplified proportional model, purchase cash is Q × P × (1 + b) plus fixed buy charges. Net sale cash is Q × S × (1 − s) minus fixed sale charges. Here b and s are assumed aggregate proportional costs, not tax-law rates. Break-even sale price is [Q × P × (1 + b) + fixed buy charges + fixed sale charges] divided by [Q × (1 − s)].
3.2 A transparent teaching example
Teaching assumptions: 1,000 shares bought at PKR100, aggregate buy and sell cost of0.2% each, no fixed charge, no distributions and no separate income tax. Purchase cash is PKR100,200. Selling at PKR101 produces PKR101,000 gross, PKR202 sale cost and PKR100,798 net, leaving PKR598 economic gain. The simplified break-even price is about PKR100.4008, before applying permitted price increments and actual fee rules.
Step-by-step method
- State quantity, price and every assumed cost explicitly.
- Calculate purchase cash and net sale cash independently.
- Compare economic break-even with the actual executable price and rules.
The example’s PKR1,000 gross price gain becomes PKR598 after PKR402 total assumed charges. It demonstrates arithmetic only; it is not a JISPL commission quote or a prediction of investment return.
Measure costs that are not obvious ledger deductions
4.1 Spread, impact and slippage
The spread is the gap between available buying and selling quotes. Market impact occurs when your order consumes available depth or changes execution conditions. Slippage compares actual execution with a clearly defined reference price; choose the reference before reviewing the result. These effects can matter even when the explicit commission is small. Avoid adding the same effect twice under different names.
4.2 Turnover and financing effects
Frequent trading repeats explicit and implicit costs. A financing facility can add time-dependent charges and obligations, while illiquid holdings may be expensive to exit. Compare strategies after relevant costs over the same period, not simply by the number of winning trades. A low advertised rate cannot compensate for a process that generates unnecessary turnover or unmanaged financing exposure.
Step-by-step method
- Estimate explicit charges and execution frictions separately.
- Use actual fill prices when reviewing completed transactions.
- Review turnover and financing costs at portfolio level.
Two strategies have the same gross gain, but one trades many more times and pays more costs. The learner compares net outcomes and workload rather than declaring the more active strategy superior.
Reconcile and query differences systematically
5.1 Estimate versus the contract note
Save the order history, execution report, tariff and contract note. Match quantities, executed prices, gross value and each deduction to the cash ledger. Settlement timing, reversals and periodic fees can create apparent differences if reports cover different dates. Do not force a reconciliation by inserting an unidentified balancing number.
5.2 A repeatable monthly cost review
For an unexplained entry, ask a precise question with the date, amount, security and document reference. Request the rate, base and supporting rule where appropriate. Keep the response and any correction. A monthly summary should distinguish trading costs, recurring account costs, financing and income taxes; this makes strategy comparison and annual tax preparation more reliable.
Step-by-step method
- Reconcile the same transactions over matching dates.
- Document any unmatched charge with a clear reference.
- Update the cost model when a verified tariff or rule changes.
A learner finds a monthly custody debit missing from the per-trade estimate. The trade arithmetic was not necessarily wrong; the portfolio cost model needed a separate periodic-fee line. The revised review now captures both costs.
Gross gain, assumed charges and net result
| Measure | Value |
|---|---|
| Gross price gain | 1,000 PKR |
| Total assumed costs | 402 PKR |
| Net economic gain | 598 PKR |
Reference table
| Item | PKR | Meaning |
|---|---|---|
| Gross purchase | 100,000 | 1,000 ×100 |
| Assumed buy cost | 200 | 0.2% ×100,000 |
| Gross sale | 101,000 | 1,000 ×101 |
| Assumed sell cost | 202 | 0.2% ×101,000 |
| Net economic gain | 598 | 101,000 −202 −100,000 −200 |
Glossary of key terms
- Break-even
- The price or result at which the specified proceeds cover the specified costs.
- Commission
- Payment for brokerage service under the applicable tariff.
- Cost base
- The amount or quantity to which a fee calculation is applied.
- Gross traded value
- Executed quantity multiplied by executed price.
- Levy
- A charge imposed under an applicable regulatory or statutory framework.
- Round trip
- A purchase and subsequent sale used together for cost analysis.
- Slippage
- Difference between actual execution and a predefined reference price.
- Spread
- Difference between available buying and selling prices.
Frequently asked questions
Is every deduction a tax?
No. Classify commission, service fees, levies, taxes and periodic costs.
Are the example rates current JISPL rates?
No. They are explicit teaching assumptions; obtain the current tariff for actual use.
Is break-even the same as taxable profit?
Not necessarily. Economic costs and legally allowable tax adjustments can differ.
Why can my actual cost exceed the estimate?
Check rate bases, minimums, execution prices, omitted periodic items and the effective schedule.
Common pitfalls
| Common mistake | A better approach |
|---|---|
| Adding quoted percentage and floor together | Apply the tariff’s actual rule. |
| Ignoring selling charges | Model both purchase and disposal. |
| Treating CGT as a flat charge on all proceeds | Use the correct gain computation and applicable legal treatment. |
| Comparing gross strategy results | Include explicit costs, frictions and financing where relevant. |
Your learner task
Using a verified tariff and an anonymised contract note, build a cost worksheet showing quantity, price, gross value, each rate/base and net cash. Then calculate a labelled teaching round trip and explain which costs are excluded from any simplified formula.
Sources & verification
Use the linked documents to check the factual and regulatory context. Source dates and limitations are stated where relevant. Educational examples and analytical frameworks are not personalised recommendations.
- JISPL · Knowledge curriculum ↗
Source topic identity; explanations expanded and factual limitations corrected.
- PSX · Investor Awareness Guide ↗
Supports tariff disclosure and separation of regulatory/statutory charges; obtain current operative rates separately.
- PSX · Guide to investors ↗
Explains the need to understand commissions and taxes; no outdated rate is reproduced.
Editorial review: 22 October 2026