FRM Exam Part II · Country Risk: Determinants, Measures, and Implications

Sovereign Default Risk and Its Determinants

Updated 11 October 2026 · Fact-checked

Sovereign default risk is the chance a government fails to pay its debt on time or in full. It depends on debt burden, growth, fiscal and external balances, political and institutional strength, and the debt's currency. To answer questions, identify the driver, judge its direction, and link it to rating, spread and economy-wide cost.

Understand Sovereign Default Risk and Its Determinants

A sovereign default happens when a government does not meet its debt obligations as agreed. This includes missed payments and also restructurings that cut value for lenders. Unlike a company, a government cannot be liquidated. Lenders cannot seize its assets easily, so repayment depends largely on the government's ability and willingness to pay.

Ability to pay is mostly economic. A government repays from tax revenue, from new borrowing and, for foreign-currency debt, from export earnings and reserves. High debt relative to GDP, high interest costs, large deficits, slow growth and thin foreign reserves all weaken ability. A country that borrows in its own currency can print money to pay, so it rarely defaults on that debt in nominal terms. The cost is inflation, and lenders still lose in real terms. Foreign-currency debt has no such escape.

Willingness to pay is political and institutional. Weak legal systems, unstable governments, corruption, poor policy credibility and a history of default raise risk. A government may choose to default when the political cost of austerity exceeds the cost of defaulting. Countries with a long record of default tend to carry higher risk, a pattern often called serial default.

Default is costly, which is why governments avoid it. Typical effects are loss of market access, higher future borrowing costs, a fall in output, a banking crisis (banks hold government bonds), a sharp currency fall and capital flight. Damodaran-style country risk analysis treats these drivers as the base for sovereign ratings, and then for sovereign spreads and country risk premiums.

Remember the logic as a chain. Fundamentals and institutions set default risk. Default risk shows up in ratings and bond or CDS spreads. Spreads feed country risk premiums that raise the cost of capital for firms in that country.

Key formulas to remember

Debt-to-GDP ratio: Debt-to-GDP = Government debt ÷ GDP; Main solvency indicator. Higher is generally riskier, but there is no universal safe level.
Debt dynamics (approximate): Change in debt ratio ≈ (r − g) × previous debt ratio − primary balance ratio; r is the average interest rate on debt, g is nominal GDP growth, and primary balance is surplus before interest (positive reduces debt). If r > g, debt rises unless the primary surplus is large enough.
Debt-stabilising primary balance: Primary balance ratio = (r − g) × debt ratio; The primary surplus needed to hold the debt ratio constant. If g > r, the required balance is negative.
Sovereign default spread: Default spread = Sovereign bond yield − Risk-free yield (same currency); Compare bonds in the same currency, otherwise inflation differences distort the spread.
Spread and default probability (approximate): Spread ≈ PD × LGD; A rough risk-neutral link, ignoring risk premium and liquidity effects. LGD = 1 − recovery rate.

How to solve Sovereign Default Risk and Its Determinants questions

Use this sequence for any question on why a sovereign defaults or how risky it is.

1Identify the debt: local or foreign currency, short or long maturity, domestic or external holders.
2Separate ability to pay from willingness to pay.
3List the economic drivers given: debt-to-GDP, deficit, growth, interest costs, reserves, external balance.
4List the political and institutional drivers: stability, rule of law, policy credibility, default history.
5If numbers are given, compute the debt ratio or the r − g effect and state the direction of risk.
6Link the result to the observable outcome: rating, spread or CDS, and country risk premium.
7If asked about consequences, cover market access, output, banks, currency and borrowing costs.
8Check the answer against the exact wording and pick the option that is most specific and conditional.

Quickest way: Local vs foreign currency, then r versus g

When to use it: Use for MCQs that ask which country is riskier or which factor matters most.

Check currency of debt first. Foreign-currency debt with low reserves is the highest-risk setup.
Compare r and g. If r exceeds g and the primary balance is weak, debt is on a rising path.
Scan for institutional weakness or default history as a tiebreaker.
Eliminate options that claim one factor alone decides default or that give a fixed safe debt level.

Common mistakes in Sovereign Default Risk and Its Determinants

Treating debt-to-GDP as the only determinant.
It is the most quoted number.
Fix: Always weigh growth, interest cost, currency of debt, reserves and institutions. Some high-debt countries are low risk.
Saying a country with local-currency debt cannot lose investors money.
Confusing nominal repayment with real value.
Fix: Printing money avoids nominal default but can cause inflation and currency loss, so real returns suffer.
Ignoring willingness to pay.
Candidates focus on numbers.
Fix: Remember governments can choose to default. Political stability and institutions matter alongside capacity.
Getting the r − g sign wrong.
Mixing real and nominal terms or forgetting the primary balance sign.
Fix: Use nominal r and nominal g together, or real with real. A primary surplus lowers the debt ratio.
Comparing spreads across currencies.
Spread looks like a pure default measure.
Fix: Use a same-currency risk-free benchmark so the spread captures default risk, not inflation differences.
Assuming default has no lasting cost.
Thinking creditors are the only losers.
Fix: Recall the effects on market access, banks, output, currency and future borrowing cost.

Worked examples

Example 1

A country has debt of 90% of GDP. The average interest rate on debt is 5% and nominal GDP growth is 3%. What primary balance (as a % of GDP) keeps the debt ratio constant? Is a primary balance of 1% of GDP enough?

Show the solution

Use primary balance = (r − g) × debt ratio.
r − g = 5% − 3% = 2%.
Required balance = 2% × 90% = 1.8% of GDP surplus.
Compare with 1%: 1% is less than 1.8%.

Answer: A primary surplus of 1.8% of GDP is needed. A 1% surplus is not enough, so the debt ratio will keep rising by about 0.8 percentage points of GDP per year, under this approximation.

Example 2

Country A and Country B both have debt of 80% of GDP. A borrows mainly in its own currency from domestic banks and has a stable, rules-based government. B borrows mainly in USD from foreign investors, has low reserves and a history of default. Which has higher sovereign default risk and why?

Show the solution

Debt levels are equal, so look at other drivers.
Currency: B's USD debt cannot be inflated away and needs foreign exchange to service. A can use its own currency.
Reserves: B's low reserves reduce its ability to pay.
Institutions: A is stable, while B has a default history, which signals weaker willingness to pay.
Conclude B is riskier.

Answer: Country B has higher default risk because of foreign-currency debt, low reserves and weaker institutions, even though debt-to-GDP is the same.

Exam tips

Expect case-style questions with two countries that look similar on one metric. Find the differentiating factor.
Always state the currency of debt. It is a favourite test point.
Do the r − g arithmetic carefully and keep growth nominal if the rate is nominal.
Link default risk to the next step: ratings, spreads and country risk premium. Questions often move along that chain.
Watch for absolute words like always or only. They are usually wrong.

Practice questions from Country Risk: Determinants, Measures, and Implications

Sovereign Default Risk and Its Determinants in other exams

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

Sovereign Default Risk and Its Determinants: frequently asked questions

Why do countries default on debt?

Usually because ability to pay falls (high debt, weak growth, a shock, low reserves) or willingness to pay falls (political pressure, weak institutions). Often both combine. Default is costly, so it tends to occur when the cost of repaying looks larger.

Can a country default on local-currency debt?

It can, but it is less common because the government can create its own currency. The usual cost is inflation and currency depreciation instead. Some governments still restructure local debt.

What is the effect of sovereign default on the economy?

Typical effects are loss of access to credit markets, higher borrowing costs later, a fall in output, stress on banks holding government bonds and a weaker currency. Severity varies by country.

Is there a debt-to-GDP level that triggers default?

No fixed level exists. Risk depends on growth, interest costs, currency of debt, reserves and institutions. Some countries carry high debt safely while others default at lower levels.