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CS Executive · Tax Laws and Practice

Input Tax Credit and Computation of GST Liability

Input tax credit (ITC) lets a registered person reduce the GST paid on inputs from the GST payable on outward supplies. To solve questions, check eligibility and conditions, remove blocked credits, apportion for exempt or non-business use, then utilise credit in the prescribed order and pay the balance in cash.

What this chapter covers

This chapter covers the credit mechanism that makes GST a tax on value addition. You learn when credit can be taken, when the law blocks it, how credit is matched with your suppliers' returns, how it is used to pay tax, and how the final cash liability is worked out.

The chapter is the working heart of the GST part of Paper 7. It uses what you learnt earlier on supply, time, place and value of supply and rate of tax. Those decide the output tax. This chapter decides how much of that tax you can set off, and how much you must pay.

It links forward to returns, payment and refunds. A question on a return or a refund usually assumes you can compute net liability correctly. Treat this chapter as the base for those topics.

Questions from this chapter are usually theory plus a short computation, so they reward students who know the section and can apply it to facts. Blocked credits in section 17(5), apportionment under section 17(1) and 17(2), and the matching rules in section 38 are favourites because each can be tested with a small fact pattern. A student who learns the conditions precisely can score full marks on the provision, the analysis and the conclusion, which is how ICSI wants answers written.

Input Tax Credit and Computation of GST Liability: topics in the order to study them

  1. 1Eligibility and Conditions for Taking Input Tax CreditStart here because every other topic assumes you know who can take credit and on what conditions.
  2. 2Blocked Credits and Apportionment of CreditNext, learn what is taken away from eligible credit: section 17(1), (2) and (5) decide how much remains.
  3. 3Communication of Inward Supplies and Matching of CreditThen see how credit is tied to the supplier's reporting, including the auto-generated statement under section 38.
  4. 4Utilisation of Input Tax Credit and Order of Set-offOnce you know the credit available, learn which tax it can pay and in what order.
  5. 5Special Cases: Input Service Distributor, Transfers and ReversalsThese exceptions are easier after the main rules are firm, since each one changes a rule you already know.
  6. 6Computation of GST Liability and Payment of TaxFinish with computation, which combines output tax, usable credit and cash payment in one answer.

How to prepare Input Tax Credit and Computation of GST Liability

This chapter is part rule, part arithmetic. Prepare both together so that you can state the provision and then apply it to numbers.

  1. Read each section of the Act in the bare text first. Mark the conditions and the exceptions, because exam facts are built around them.
  2. Make a one-page list of section 17(5) blocked items. For each, note the exception that restores credit, such as motor vehicles used for transporting passengers or further supply.
  3. Practise apportionment: split inputs into business and non-business, then taxable and exempt use. Write each step so that the examiner can follow it.
  4. Read section 38 slowly. Note what the auto-generated statement shows, and the situations in which credit cannot be availed, such as a supplier who has defaulted in payment of tax.
  5. Learn the order of set-off with a small table in your notes, then do several computations: output tax, less usable credit, equals cash payable.
  6. Write answers in ICSI style: the provision with section number, the facts applied, then a clear conclusion. Time yourself on each answer.
  7. Revise the special cases (ISD, transfers, reversals) last, and attempt a mixed question that uses the whole chapter.

Common mistakes in Input Tax Credit and Computation of GST Liability

  • Treating all credit on business purchases as allowed

    Fix: Check every input against the blocked list first, then check its exceptions before allowing credit.

  • Ignoring the exceptions to blocked credit

    Fix: Learn each blocked item together with its exception, and test both in practice questions.

  • Apportioning credit without separating non-business from exempt use

    Fix: Apply 17(1) first for business versus other purposes, then 17(2) for taxable versus exempt supplies.

  • Counting construction of plant and machinery as blocked

    Fix: Read the clauses with the Explanation on plant and machinery and check whether the asset is fixed to earth and used for outward supply.

  • Giving a numerical answer with no provision or conclusion

    Fix: State the section, apply the facts, show each step, and end with a one-line conclusion on the credit allowed and cash payable.

Last-day revision: Input Tax Credit and Computation of GST Liability

  • ITC reduces output tax with tax paid on inputs used for business.
  • Section 17(1): credit is restricted to the part attributable to business purposes.
  • Section 17(2): where inputs serve taxable (including zero-rated) and exempt supplies, credit is limited to the taxable part.
  • Exempt supply value includes reverse charge supplies, securities transactions, sale of land and, subject to the Act, sale of building.
  • Banks and NBFCs accepting deposits or giving loans may opt for 50% of eligible credit each month; the option cannot be withdrawn during that financial year.
  • Section 17(5) blocks credit on items such as food and beverages, club membership, personal consumption, and goods lost, stolen or given as gifts or free samples.
  • Credit on construction of immovable property on own account is blocked, except plant and machinery.
  • Credit on goods or services used for CSR activities under section 135 of the Companies Act, 2013 is blocked.
  • Section 38 makes details of outward supplies and an auto-generated statement of ITC available to the recipient.
  • Credit cannot be availed on supplies from certain suppliers, such as those who have defaulted in payment of tax for the prescribed period.
  • Always write the computation step by step: output tax, eligible credit, set-off, cash payable.

Input Tax Credit and Computation of GST Liability practice questions

Input Tax Credit and Computation of GST Liability in other exams

The same ground in other exams, if you are preparing for more than one or want another angle on it.

Input Tax Credit and Computation of GST Liability: frequently asked questions

What is input tax credit under GST?

It is the credit of tax paid on inputs, capital goods and input services, which a registered person can set off against the tax on outward supplies. It is available only when the Act's conditions are met and the item is not blocked.

What is the auto-generated statement in section 38?

It is an electronic statement made available to the recipient showing details of ITC based on suppliers' outward supply details. It shows credit that may be available and credit that cannot be availed in the cases listed in the section.

Is credit allowed on food and beverages?

Generally no, because section 17(5) blocks it. A proviso allows credit where the inward supply is used to make an outward taxable supply of the same category or as an element of a taxable composite or mixed supply.

How should I write answers for this chapter?

Begin with the provision and its section number, apply it to the facts, and show computations step by step. End with a clear conclusion on the credit allowed and the tax payable.