Risk Management in Banking and Insurance · Market Risk Management

Trading Book vs Banking Book: Classification and Capital Treatment

Updated 11 October 2026 · Fact-checked

The **trading book** holds financial instruments and commodities kept with trading intent or to hedge other trading positions. It is measured at fair value and attracts market risk capital. The **banking book** holds everything else, mainly loans and held-to-maturity assets, and attracts credit risk capital plus interest rate risk in the banking book (IRRBB) oversight. Solve questions by testing intent, then naming the capital charge.

Understand Trading Book vs Banking Book

A bank holds many positions. Some are bought to earn from price moves over a short time. Others are held to earn interest over the life of the asset. Regulators separate these two groups because they behave differently and carry different risks.

The trading book contains positions held with trading intent, or held to hedge other positions in the trading book. Examples are government securities held for short-term gain, equity held for trading, and derivatives held for market making. These positions are marked to market (fair value) every day. The main risk is a fall in market prices, so the capital charge is for market risk.

The banking book contains all positions that are not in the trading book. Typical items are loans and advances, deposits, and investments held to earn interest until maturity. These are usually carried at cost or amortised cost. The main risk is borrower default, so capital is for credit risk. Interest rate movements still matter, and the bank manages them as interest rate risk in the banking book (IRRBB) under a separate supervisory framework.

The boundary matters because the same instrument can attract very different capital depending on where it sits. A bank could move a loss-making position to the banking book to avoid fair value losses, or move a position to the book with lower capital. So Basel rules and RBI guidelines require a board-approved policy, clear criteria, documented evidence of intent, and tight limits on moving positions between books after initial designation.

In short: classify by intent and ability to trade, not by the type of instrument. Then link the book to its valuation basis, its main risk and its capital charge.

Key rules to remember

Trading book definition: Trading book = positions held with trading intent + positions held to hedge trading book positions; Intent is the test. The instrument type alone does not decide the book.
Banking book definition: Banking book = all positions not in the trading book; It is a residual category. Loans, deposits and held-to-maturity investments usually sit here.
Capital linkage: Trading book → market risk capital; Banking book → credit risk capital (plus IRRBB supervision); Counterparty credit risk on trading book derivatives is still capitalised separately.
Valuation linkage: Trading book → fair value (mark to market); Banking book → cost or amortised cost, mostly; Exact accounting follows the applicable standards and RBI norms.
Reclassification rule: Switching books after initial designation is allowed only in exceptional cases, with senior management approval and board-approved policy; Any capital benefit from a switch is not allowed to the bank. State this as the principle.

How to solve Trading Book vs Banking Book questions

Use this sequence for any question on classification, boundary or capital treatment.

1Read the position and note why the bank holds it: short-term gain, market making, hedge of trading positions, or earning interest until maturity.
2Apply the intent test. Trading intent or a hedge of trading positions goes to the trading book. Everything else goes to the banking book.
3Check for evidence: board-approved policy, documented strategy, limits, daily valuation and active management. Lack of evidence points to the banking book.
4State the valuation basis: fair value for the trading book, cost or amortised cost for the banking book.
5State the main risk and capital charge: market risk capital for the trading book, credit risk capital for the banking book, plus IRRBB oversight.
6If the question mentions a transfer, apply the reclassification restrictions and the bar on capital arbitrage.
7Close with a one-line conclusion that links the book, the risk and the capital.

Quickest way: Intent, Valuation, Capital (IVC) check

When to use it: Use in MCQs and short-note questions where you must place a position or state the capital treatment in under two minutes.

Ask: is it held to trade or to hedge trading positions? If yes, trading book.
If no, it is banking book by default.
Attach the pair: trading book means fair value and market risk; banking book means amortised cost and credit risk plus IRRBB.
For transfer questions, answer: restricted, exceptional, approved, and no capital benefit.

Common mistakes in Trading Book vs Banking Book

Classifying by instrument type, for example saying all government securities are banking book.
Students memorise lists of instruments instead of the intent test.
Fix: The same security can sit in either book. Decide by intent and documented strategy.
Saying the banking book carries no interest rate risk capital consideration.
Students link interest rate risk only to market risk.
Fix: Banking book positions carry IRRBB, which is managed and supervised separately from trading book market risk capital.
Treating the banking book as a defined list of assets only.
The word 'loans' dominates textbooks.
Fix: The banking book is the residual: all positions not in the trading book, including assets and liabilities.
Allowing free movement of positions between books.
Students see it as a normal accounting choice.
Fix: Switching is restricted because it can be used for capital arbitrage or to hide losses. State that approval and policy are needed and no capital benefit is allowed.
Writing that the trading book has no credit risk.
Students over-simplify to 'trading means market risk'.
Fix: Trading book derivatives still carry counterparty credit risk, which is capitalised separately from general market risk.

Worked examples

Example 1

A bank buys ₹50 crore of Government of India securities to sell within a few weeks and profit from expected price rises. It also holds ₹200 crore of corporate loans to maturity. Classify each position, state the valuation basis and the main capital charge.

Show the solution

Government securities: purchased to sell soon for price gains. This is trading intent, so the trading book.
Valuation: fair value, marked to market regularly.
Capital: market risk capital, because the loss risk is a fall in market prices.
Corporate loans: held to earn interest until maturity, so no trading intent. They are in the banking book by default.
Valuation: cost or amortised cost, less provisions where required.
Capital: credit risk capital, because the main loss risk is borrower default. Interest rate risk is overseen under IRRBB.

Answer: The ₹50 crore securities belong in the trading book (fair value, market risk capital). The ₹200 crore loans belong in the banking book (amortised cost, credit risk capital, with IRRBB oversight).

Example 2

A bank's treasury wants to move a loss-making equity holding from the trading book to the banking book, so that price falls stop hitting profit and loss. Advise whether it can do so.

Show the solution

Identify the issue: a reclassification after the initial designation, motivated by avoiding fair value losses.
State the principle: the boundary must be based on intent, and switching is restricted to prevent capital arbitrage and hiding of losses.
Apply: a loss-driven switch is not a valid reason. Only exceptional, documented circumstances under a board-approved policy and with senior management approval can justify a switch.
State the consequence: even if a switch is approved, the bank must not gain any capital benefit from it.
Recommend: keep the holding in the trading book, recognise the fair value loss, and manage it through limits or by selling or hedging.

Answer: No. A switch to avoid losses is not permitted. Reclassification needs exceptional circumstances, approval and policy backing, and no capital benefit may arise. The holding stays in the trading book at fair value.

Exam tips

Begin every classification answer with the word 'intent'. Examiners look for it.
In a case scenario, underline phrases such as 'to sell shortly', 'market making' and 'hold to maturity'. They decide the book.
Always pair the book with both valuation basis and capital charge. A half pair loses marks.
For long answers, include a line on why the boundary matters: capital arbitrage and consistent risk measurement.
Do not quote paragraph numbers of Basel or RBI documents unless you are certain. Describe the principle in words.

Practice questions from Market Risk Management

Trading Book vs Banking Book in other exams

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

Trading Book vs Banking Book: frequently asked questions

What is the main difference between the trading book and the banking book?

The trading book holds positions kept with trading intent or to hedge trading positions, valued at fair value and capitalised for market risk. The banking book holds the rest, mainly loans and held-to-maturity items, capitalised for credit risk with IRRBB oversight.

Why does the boundary between the two books matter?

Capital rules and valuation differ between the books. Without a clear boundary, a bank could shift positions to reduce capital or avoid recognising losses. Clear criteria and restricted transfers prevent this.

Can a bank move an instrument from one book to the other?

Only in exceptional cases, under a board-approved policy and with senior management approval. A bank must not obtain a capital benefit from the move.

Do banking book positions face interest rate risk?

Yes. Interest rate risk in the banking book (IRRBB) arises from rate changes affecting earnings and economic value of banking book positions. It is managed and supervised separately from trading book market risk capital.