Skip to content

FRM Exam Part II · The Investment Function in Financial Services Management

Objectives and Role of the Bank Investment Function

Updated 11 October 2026 · Fact-checked

The investment function is the part of a financial institution that manages its securities portfolio. Banks hold securities to provide liquidity, earn income on funds not lent, and manage interest rate and balance sheet risk. These goals conflict, so you solve questions by identifying the priority objective and the tradeoff it forces.

Understand Objectives and Role of the Investment Function

A bank takes deposits and other funding and lends most of it. Loans are the main earning asset, but loan demand is uneven and loans are hard to sell quickly. The investment portfolio fills the gap. It holds securities such as government bonds, agency securities and high-grade corporate or structured paper.

The portfolio has several jobs. First, liquidity: high-quality liquid securities can be sold or pledged as collateral in repo to meet withdrawals or funding stress. Second, income: when loan demand is weak, securities earn a return on surplus funds. Third, balance sheet management: the portfolio can be shortened or lengthened to adjust the bank's interest rate risk, and it can hold assets that suit regulatory needs, for example liquidity ratios such as the LCR, which count high-quality liquid assets (HQLA).

Other roles include pledging securities as collateral for central bank or secured funding, and managing taxes or capital use where relevant. Securities usually carry lower credit risk than loans and lower risk weights, so they also use less capital per unit of assets.

The key point is tradeoffs. The most liquid securities, such as short-term government bills, usually yield less. Longer maturities and lower credit quality usually yield more but carry price risk, credit risk and lower liquidity. A portfolio built only for yield can be hard to sell in stress. A portfolio built only for liquidity may not cover the bank's funding costs.

So the investment policy must be set by the bank's risk appetite, funding profile and regulatory needs. A bank with volatile wholesale funding needs a bigger, shorter, more liquid buffer. A bank with stable deposits and weak loan demand can take more duration and yield, within limits.

Key formulas to remember

Net interest margin (NIM)
NIM = (Interest income − Interest expense) ÷ Average earning assets
Securities income feeds NIM. Shifting to liquid, low-yield assets lowers NIM, all else equal.
Liquidity Coverage Ratio (LCR)
LCR = Stock of HQLA ÷ Total net cash outflows over the next 30 calendar days ≥ 100%
Basel III rule. The securities portfolio is a main source of HQLA.
Approximate price change from rates
ΔP ÷ P ≈ −Modified duration × Δy
Approximation for small yield changes. Longer duration means more price risk for extra yield.
Portfolio yield
Portfolio yield = Σ (weight × yield of each holding)
Use to see the income cost of holding more liquid securities.

How to solve Objectives and Role of the Investment Function questions

Use this method for any question on why a bank holds securities or how it should structure the portfolio.

  1. 1Read the scenario and identify the bank's funding profile: stable deposits or volatile wholesale funding.
  2. 2Note loan demand, interest rate outlook and any regulatory constraint such as the LCR.
  3. 3Name the objective the question stresses: liquidity, income or balance sheet management.
  4. 4Identify the competing objective and state the tradeoff, for example yield against liquidity.
  5. 5Link the tradeoff to a risk: liquidity risk, interest rate risk, credit risk or capital use.
  6. 6Choose the portfolio feature that fits: maturity, credit quality, HQLA share or duration.
  7. 7Check the answer against the scenario. Remove options that maximise one goal while ignoring a stated constraint.

Quickest way: Priority-and-tradeoff check

When to use it: Use when an MCQ asks which portfolio choice or objective fits a described bank.

  1. Find the stated constraint or stress in the stem. It usually sets the priority.
  2. If funding is unstable or a liquidity ratio is binding, pick the more liquid, higher-quality option.
  3. If funding is stable and loan demand is weak, pick the option that adds yield with controlled duration.
  4. Reject options that call one objective free of cost. Every gain in yield costs liquidity, price risk or credit risk.

Common mistakes in Objectives and Role of the Investment Function

  • Treating income as the only reason banks hold securities.

    Students think of securities as investments, as in asset management.

    Fix: Remember the order: liquidity and balance sheet management come first, income is the residual benefit.

  • Assuming higher yield is always better.

    Yield is easy to see, while liquidity and price risk are less obvious.

    Fix: Ask what extra risk pays for the extra yield: longer duration, lower credit quality or thinner market.

  • Confusing the liquidity buffer with the whole portfolio.

    Both are described as liquid assets.

    Fix: Only securities meeting HQLA criteria count toward the LCR. Other holdings may be less liquid.

  • Ignoring the funding side when choosing the portfolio.

    Questions look like asset-only problems.

    Fix: Always match the portfolio to funding stability. Volatile funding calls for a larger, shorter buffer.

  • Saying securities carry no risk because they are high quality.

    Government bonds are seen as safe.

    Fix: They still carry interest rate risk. Rising yields cut prices, and long bonds can create large unrealised losses.

Worked examples

Example 1

A bank funds itself mostly with short-term wholesale borrowing. Loan demand is weak. Management proposes moving the whole securities portfolio from 1-year government bills yielding 4.0% to 10-year corporate bonds yielding 5.5%. Explain the tradeoff.

Show the solution
  1. Funding is volatile, so liquidity is the priority objective.
  2. The move raises yield by 1.5 percentage points: 5.5% − 4.0% = 1.5%.
  3. The cost is lower liquidity: corporate bonds are harder to sell or repo in stress than bills.
  4. It also adds interest rate risk through longer duration and adds credit risk.
  5. If funding is withdrawn, forced sales could realise losses and the bank may fall short of liquidity requirements.

Answer: The 1.5% yield gain comes at the cost of liquidity, duration and credit risk. With volatile funding, the bank should keep a large share in short, high-quality liquid securities and add yield only with the residual portfolio.

Example 2

A bank has a ₹500 crore securities portfolio. ₹300 crore is in government bills yielding 4% and ₹200 crore is in bonds yielding 6%. What is the portfolio yield, and what is the income cost of moving ₹100 crore from the bonds to bills?

Show the solution
  1. Current income: 300 × 4% = ₹12 crore. 200 × 6% = ₹12 crore. Total = ₹24 crore.
  2. Portfolio yield = 24 ÷ 500 = 4.8%.
  3. After the move: bills = ₹400 crore × 4% = ₹16 crore. Bonds = ₹100 crore × 6% = ₹6 crore. Total = ₹22 crore.
  4. New yield = 22 ÷ 500 = 4.4%.
  5. Income cost = 24 − 22 = ₹2 crore a year, or 0.4 percentage points.

Answer: The current portfolio yield is 4.8%. Moving ₹100 crore to bills lowers income by ₹2 crore a year, which is the price paid for more liquidity.

Exam tips

  • Start from the funding profile. It decides which objective wins in most case questions.
  • Expect tradeoff wording such as 'most appropriate' or 'primary objective'. Pick the option that balances goals, not the extreme one.
  • Link securities to the LCR and HQLA when a regulatory ratio is mentioned.
  • Check small calculations for yield or income by weights. Write each holding's income first.

Practice questions from The Investment Function in Financial Services Management

Objectives and Role of the Investment Function in other exams

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

Objectives and Role of the Investment Function: frequently asked questions

Why do banks hold securities instead of lending everything?

Securities are easier to sell or pledge than loans, so they provide liquidity. They also earn income when loan demand is weak and help manage interest rate risk and regulatory ratios.

What is the main tradeoff in the bank investment function?

The main tradeoff is liquidity against yield. Highly liquid, high-quality securities usually earn less, while higher-yielding ones carry more price, credit or liquidity risk.

How does the investment portfolio help with the LCR?

High-quality liquid assets in the portfolio form the numerator of the LCR. The ratio compares them with net cash outflows over 30 days and must be at least 100%.

Is the investment function the same as asset management?

No. A bank's investment function supports its own balance sheet, liquidity and funding needs. An asset manager invests on behalf of clients to meet their objectives.