FRM Exam Part II · Basel III: Finalising Post-crisis Reforms

Basel III Finalisation: Overview and Objectives Explained

Updated 11 October 2026 · Fact-checked

Basel III finalisation is the December 2017 package that completed the post-crisis capital reforms. Its main aim is to cut excessive variability in risk-weighted assets (RWA) so that capital ratios are credible and comparable across banks. It does this by revising the standardised approaches, constraining internal models, and adding an output floor.

Understand Basel III Finalisation Overview and Objectives

Capital ratios are a fraction. The numerator is regulatory capital. The denominator is risk-weighted assets (RWA). If banks with similar portfolios report very different RWA, their capital ratios cannot be compared. The ratio then tells you little.

After the 2007-09 crisis, the Basel Committee found this was a real problem. Reviews of banks' models showed large differences in RWA for the same hypothetical portfolios. Some of the gap reflected real risk differences. A large part came from model choices, weak data and national discretion. Market trust in reported ratios fell.

The 2017 package, often called Basel III finalisation (or 'Basel III endgame' in US discussion), responds to this. Its stated objectives are to restore credibility in RWA calculation and to improve comparability of capital ratios. It does not aim to raise capital requirements significantly for the whole system. The Committee said it did not intend a significant overall increase.

The pieces fit together in layers:

Credit risk, standardised approach: made more risk-sensitive and less reliant on external ratings alone.
Credit risk, internal ratings-based (IRB): some portfolios lose access to advanced models, and input floors apply to PD, LGD and EAD parameters.
CVA risk: framework revised and aligned with the market risk approach.
Operational risk: all earlier approaches replaced by a single standardised approach.
Leverage ratio: revised, with a buffer for G-SIBs.
Output floor: a bank's RWA from internal models cannot fall below a set percentage of RWA under the standardised approaches. It is the backstop that ties the pieces together.

Think of it as three moves: simplify, constrain, and backstop. Exam questions test whether you can link each tool to the objective of lower RWA variability.

Key formulas to remember

Risk-based capital ratio: Capital ratio = Regulatory capital ÷ RWA; Variability in RWA directly changes the ratio. This is the core reason for the reforms.
Output floor rule: Total RWA = max(RWA from internal models, floor % × RWA from standardised approaches); The 2017 package sets the floor at 72.5% of standardised RWA, calculated at total bank level, not per risk type.
Leverage ratio: Leverage ratio = Tier 1 capital ÷ Exposure measure; Non-risk-based backstop. The minimum is 3%, with a buffer for G-SIBs.
Implied floor binding test: Floor binds if 72.5% × standardised RWA > internal-model RWA; When it binds, the floored figure is used as the denominator.

How to solve Basel III Finalisation Overview and Objectives questions

Use this method for any question on the objectives and structure of the finalised reforms.

1Identify what the question asks: a motivation, a specific tool, or a calculation.
2Link the issue to the core problem: excessive RWA variability and loss of comparability.
3Place the tool in the package: credit standardised, IRB, CVA, operational, leverage ratio or output floor.
4Decide whether the tool simplifies, constrains or backstops.
5For numbers, compute standardised RWA first, then apply 72.5% and compare with model RWA.
6Take the larger figure as total RWA, then compute the capital ratio.
7Check the answer against the stated intent: no significant overall capital increase, better comparability.

Quickest way: Simplify, constrain, backstop

When to use it: Use it for conceptual MCQs asking which reform does what or why it exists.

Simplify: new standardised approaches for credit, CVA and operational risk.
Constrain: IRB limits on model use and input floors.
Backstop: output floor and leverage ratio.
Eliminate options that claim the aim is to raise capital sharply or to remove internal models entirely.
For floor questions, multiply standardised RWA by 72.5% and take the maximum.

Common mistakes in Basel III Finalisation Overview and Objectives

Saying the main goal was to raise capital requirements sharply.
Basel III is associated with higher capital in 2010, so students merge the two packages.
Fix: The 2017 package targets RWA credibility and comparability. It was not designed for a significant overall capital increase.
Thinking the output floor removes internal models.
The word floor sounds like a ban.
Fix: Internal models stay. The floor only limits how far model RWA can fall below standardised RWA.
Applying the output floor separately to each risk type.
Students assume each risk category has its own floor.
Fix: The floor applies to total RWA at bank level, comparing the model-based total with the standardised total.
Taking 72.5% of model RWA instead of standardised RWA.
Rushing and mixing up the two figures.
Fix: The percentage always multiplies the standardised RWA. Then compare with the model figure.
Treating the leverage ratio as risk-sensitive.
It sits in the same package as risk-weighted measures.
Fix: The leverage ratio uses an exposure measure with no risk weights. It is a backstop to risk-based rules.

Worked examples

Example 1

A bank has internal-model RWA of USD 60 billion. Its RWA under the standardised approaches is USD 100 billion. Tier 1 capital is USD 9 billion. Using a 72.5% output floor, what is the Tier 1 ratio on floored RWA?

Show the solution

Floor level = 72.5% × 100 = USD 72.5 billion.
Compare with model RWA of USD 60 billion.
72.5 > 60, so the floor binds and total RWA = USD 72.5 billion.
Tier 1 ratio = 9 ÷ 72.5 = 12.41%.

Answer: Total RWA is USD 72.5 billion and the Tier 1 ratio is about 12.4%. Without the floor it would be 15.0%.

Example 2

Which statement best describes the main objective of the 2017 Basel III finalisation? A) Replace all internal models with standardised approaches. B) Reduce excessive RWA variability and improve comparability of capital ratios. C) Increase the minimum leverage ratio to 10%. D) Remove capital requirements for operational risk.

Show the solution

A is wrong: internal models remain, but are constrained.
C is wrong: the leverage ratio minimum stays at 3% with a G-SIB buffer.
D is wrong: operational risk is kept, with a single standardised approach replacing the earlier ones.
B matches the stated aim of restoring credibility in RWA and comparability.

Answer: B

Exam tips

Always tie each reform back to RWA variability. Examiners reward that link.
Memorise 72.5% and that it applies at total level to standardised RWA.
Expect numerical floor questions: compute both RWAs, take the maximum.
Watch for distractors claiming a big overall capital increase or a ban on internal models.

Practice questions from Basel III: Finalising Post-crisis Reforms

Basel III Finalisation Overview and Objectives: frequently asked questions

Why did the Basel Committee want to reduce RWA variability?

Banks with similar portfolios reported very different RWA, partly due to model choices and weak data. That made capital ratios hard to compare and weakened market trust. The reforms aim to restore credibility.

What is the output floor in simple terms?

It sets a minimum for a bank's total RWA at 72.5% of what the standardised approaches would give. If internal models give a lower number, the floored amount is used.

Is Basel III finalisation the same as Basel IV?

Basel IV is an informal label used by some banks and media. The Basel Committee calls it the finalisation of Basel III post-crisis reforms. In the exam, use the official name.

Does the package remove internal models?

No. Internal models stay for many exposures. Their use is restricted for some portfolios, input floors apply, and the output floor limits the benefit.