ICAB CL Principles of Taxation common mistakes
ICAB CL Principles of Taxation · Understand the traps and how to avoid them.
Treating the tax year as the calendar year when computing personal reliefs, slab rates, and filing deadlines, instead of the Bangladeshi income year (1 July to 30 June).
Candidates carry over the calendar-year habit from general knowledge or from other jurisdictions and never check the assessment-year/income-year distinction the syllabus stresses.
What to do instead
Before any computation, write the income year (1 July–30 June) and the following assessment year at the top of the answer, and date every receipt and payment against it. Practise converting dates that straddle 30 June.
Applying the highest marginal rate to total taxable income rather than stepping through the slab structure, so a single flat percentage is used for the whole base.
Slab tables are memorised as a list of rates without the associated income thresholds, and under time pressure candidates grab the top rate.
What to do instead
Reconstruct the slab table with both threshold and rate columns before computing, then compute tax slab by slab and show the working line by line. Cross-check that total tax is less than the top rate times total income.
Confusing the investment tax credit (rebate) with a deduction from taxable income, subtracting eligible investments from total income instead of computing a credit against tax payable.
Both reduce tax, so the mechanics blur; candidates also forget the credit is capped and depends on taxable income and the investment slab.
What to do instead
Memorise the sequence: gross income, exclusions, deductions, taxable income, tax on taxable income, then investment credit as a percentage of eligible investment subject to a cap, then minimum tax check. Always label the credit as a reduction of tax, not income.
Classifying a receipt as salary or business income without testing the source rules, and omitting perquisites, allowances, or employer-provided benefits from the salary base.
Head-of-income boundaries are studied in isolation, and cash allowances feel like separate items rather than part of salary.
What to do instead
For every receipt, state the head, the charging provision logic, and whether it is cash or a benefit. Keep a checklist of common perquisites and exemptions, and note which allowances are fully or partly exempt.
Ignoring the minimum tax and deemed-income provisions, so a return showing low or nil tax is presented as final without checking the floor.
These provisions sit at the end of the computation and are easily skipped when the main tax figure already looks plausible.
What to do instead
Add a mandatory final step to every computation: compare tax payable with the minimum tax base and with any deemed-income rule, and state explicitly which is higher and why.
Computing capital gains on the full sale proceeds instead of on the excess of consideration over the cost or adjusted cost basis, and misidentifying which assets are capital assets.
Sale price is the most visible number, and the cost-base rules for inherited, gifted, or improved assets are less practised.
What to do instead
Write the gain formula as consideration minus cost of acquisition minus improvement cost minus transfer expenses, then test asset classification separately. Drill cost-base rules for gifts, inheritance, and part disposals.
Mixing up TDS/withholding obligations with the taxpayer's own final liability, treating tax deducted at source as always final or never adjustable.
The withholding chapter and the assessment chapter are revised separately, so the link between credit for TDS and the final return is weak.
What to do instead
For each payment type, note who withholds, at what rate, on what base, and whether it is final, minimum, or adjustable. In computations, show TDS as a credit against assessed tax and reconcile to the balance payable or refundable.
Applying VAT and supplementary duty mechanically to the invoice value without determining taxable value, adjustment for advances, or the correct rate and point of supply.
Candidates memorise rates but not the incidence rules, and value adjustments feel like arithmetic detail rather than substantive law.
What to do instead
Build a VAT computation template: identify the supply, confirm registration status, determine taxable value, apply rate and supplementary duty in order, then adjust for input credit and advance tax. Practise with mixed supply and exempt-supply scenarios.
Answering scenario questions with a bare conclusion and no statutory reasoning, so marks for application and analysis are lost even when the figure is right.
Past practice focuses on numerical drills, and candidates underestimate how much of the mark scheme rewards identifying the issue, the rule, and the application.
What to do instead
Use a fixed three-part structure for every scenario: issue identified, rule or provision stated, application to the facts with the computation and conclusion. Time-box to leave room for the reasoning paragraphs.
Misstating filing, assessment, and appeal timelines and the consequences of default, including penalties, interest, and the difference between appeal to the appellate authority and to the tribunal.
Procedural dates are numerous and similar, and candidates revise them as a list without linking each deadline to its trigger event.
What to do instead
Build a one-page timeline map keyed to trigger events (end of income year, service of notice, date of assessment order) rather than to absolute dates, and attach the consequence of missing each deadline. Test yourself by reconstructing the map from memory.