Iraq Since 2003: Oil, Reconstruction and the Rise and Fall of ISIS

Iraq has been at war, under sanctions or rebuilding for most of the past 35 years. Since 2003 it has lived through an invasion, a sectarian civil war, the rise and defeat of the Islamic State group (ISIS), two oil-price crashes and, in 2026, the near-closure of the Strait of Hormuz. Through all of it, one thing stayed the same: oil paid for almost everything. This chapter shows how war and oil interact. It explains why a country with some of the world’s largest oil reserves still struggles to pay salaries when oil cannot reach the market.

1. Background: how the war began

Iraq’s modern economic troubles started before 2003. After Iraq invaded Kuwait on 2 August 1990, the UN Security Council imposed sanctions on 6 August 1990 under Resolution 661. These banned most of Iraq’s imports and exports.^[10] From December 1996 the UN’s Oil-for-Food Programme allowed Iraq to sell oil under UN supervision and use the money for food, medicine and other civilian goods.^[10] By September 2003 the programme had handled $65bn of oil exports. It had delivered more than $30bn of goods, including $12bn of food, and paid about $18bn into a fund to compensate victims of the Kuwait invasion.^[11] The US Government Accountability Office estimated that the Iraqi government obtained $10.1bn in illegal revenue between 1997 and 2002, through oil smuggling and kickbacks.^[10]

In March 2003 a US-led coalition invaded Iraq.^[5] The government of Saddam Hussein fell quickly, but an insurgency followed. Violence between Sunni and Shia groups grew into a sectarian conflict, peaking in 2006–07. The US sent extra troops, the “surge”, in 2007–08.^[5] All US troops left Iraq by December 2011.^[5]

In 2014 ISIS captured about a third of Iraq’s territory, including Mosul, Iraq’s second-largest city, where it declared its “caliphate”.^[13] Iraqi forces, with help from a US-led coalition, retook Mosul in 2017. On 9 December 2017 Prime Minister Haider al-Abadi declared “final victory” over ISIS.^[13]

The human toll is large and contested. The Costs of War project at Brown University estimates that between 550,000 and 580,000 people were killed in Iraq and Syria as a direct result of war since the 2003 invasion, and says several times as many may have died from indirect causes such as disease.^[6]

2. Where things stand now

As of October 2026, Iraq is facing its sharpest economic shock since the ISIS war. This time the cause is outside its borders. A regional war involving Iran broke out in late February 2026, and an Iranian blockade disrupted the Strait of Hormuz.^[16] Before the war, about 80% of Iraq’s oil was shipped through the strait.^[16]

The effect was immediate. Oil production fell from about 4.1 million barrels a day before the war to around 1.5 million in April 2026.^[2] According to Iraq’s oil minister, exports fell to a low of about 98,000 barrels a day in May 2026, down 97% on a year earlier.^[19] Oil revenue fell from $6.8bn in February to about $2.3bn a month in May and June.^[16] Yet the state needs about $6.5bn a month for salaries, pensions and social welfare, according to the finance ministry.^[16] Many public employees were not paid on time for July.^[16]

There has been a partial recovery. The World Bank says production and exports began to recover in June and July after a ceasefire announcement, the partial reopening of Hormuz and the re-routing of some exports through Syria. By July production was about 2.9 million barrels a day.^[2] Iran allowed some tankers carrying Iraqi oil to pass.^[20] Exports averaged about 2.35 million barrels a day in August. In September they started at 3 million barrels a day before easing to about 2.4 million, according to the oil ministry, still below pre-war levels.^[20] Iraq also agreed to expand exports through Turkey’s port of Ceyhan, with a target of 750,000 barrels a day.^[16]

The fiscal damage is serious. The budget deficit rose from $5bn at the end of April to $16bn at the end of June 2026, according to finance ministry data reported by AGBI.^[17] Domestic public debt reached a record 103 trillion dinars ($79bn) at the end of May.^[18] A government spokesman confirmed a liquidity crisis.^[18] The World Bank projects that GDP will shrink by 12.4% in 2026 and rebound by 16.9% in 2027.^[2] The IMF expects a deeper fall of 16.0% in 2026, followed by growth of 19.0% in 2027.^[3]

3. The economy before the war

Iraq in 2002 was a poor, isolated economy. GDP was $32.9bn and GDP per person was $1,266 in current dollars.^[1] Real GDP had already fallen by 8.2% in 2002.^[1] Sanctions limited what Iraq could import, and the Oil-for-Food Programme controlled how oil money was spent.^[10][11] Inflation was 19.3% in 2002.^[1]

Oil was already central. Oil rents were 46.7% of GDP in 2002, and exports of goods and services were 70.6% of GDP, almost all of it oil.^[1] Iraq’s oil sector produced about 1,200 terawatt-hours of energy in 2002, compared with about 1,500 in 2000, according to Energy Institute data.^[15] Iraq holds about 145 billion barrels of proven oil reserves, the world’s fifth-largest.^[17]

The population was about 26 million in 2002 and has grown fast since, to 47 million in 2025.^[1] This rapid growth has created a constant need for new jobs.

4. The economic impact: indicator by indicator

4.1 Output and GDP

The invasion caused a deep but short fall in output. Real GDP fell by 36.7% in 2003 and then rose by 53.4% in 2004 as oil exports restarted.^[1] In dollar terms, GDP grew from $21.9bn in 2003 to $234.6bn in 2013.^[1] Much of this came from higher oil prices and higher production. GDP per person reached $6,650 in 2013.^[1]

Since then, Iraq’s growth has followed oil and conflict. Growth slowed to 2.3% in 2014 as ISIS took territory, according to World Bank data; the IMF puts it at 0.7%.^[1][3] Output jumped by 13.8% in 2016 as new oil fields came on stream, then fell by 12.0% in 2020 when oil prices crashed and the COVID-19 pandemic hit.^[1] GDP fell again in 2024 and 2025, by 1.5% and 2.2%.^[1] The World Bank says both oil and non-oil activity declined in 2025.^[2]

4.2 Oil production

Oil production recovered strongly after 2003. Energy Institute data show output in 2025 at more than three times its 2003 level, measured in energy content.^[15] Growth was fastest between 2014 and 2016, even while ISIS held large areas, because the main fields are in the south, far from the fighting.^[15] In 2025 Iraq exported about 3.4 million barrels a day, according to the Arab Energy Organization.^[17] Seaborne exports averaged 3.33 million barrels a day in January–July 2025.^[19]

The weakness is geography. Most of Iraq’s exports leave from terminals near Basra and must pass through the Strait of Hormuz.^[16][17] Before 2026, only about 240,000 barrels a day went through the pipeline to Turkey.^[16] When Hormuz was disrupted, there was no easy alternative.

4.3 Oil prices and the 2014 and 2020 crashes

Because oil dominates the economy, the world oil price acts like a switch. The Brent crude price averaged $99 a barrel in 2014, $52 in 2015 and $44 in 2016.^[14] This crash came at the same time as the war against ISIS. Iraq’s budget balance swung to a deficit of 12.8% of GDP in 2015 and 14.4% in 2016, and government debt rose from 27.6% of GDP in 2014 to 60.3% in 2016, according to the IMF.^[3]

The second crash came in 2020, when Brent averaged $42.^[14] GDP fell by 12.0%, the budget deficit reached 12.8% of GDP and debt rose to 72.5% of GDP.^[1][3] The government responded by devaluing the dinar. The average official exchange rate moved from 1,192 dinars per dollar in 2020 to 1,450 in 2021.^[1] A weaker dinar means each dollar of oil revenue buys more dinars, which helps pay dinar salaries.

4.4 Inflation and the currency

Inflation was high in the first years after the invasion: 27.0% in 2004, 37.0% in 2005 and 53.2% in 2006, as violence disrupted supply.^[1] It then fell sharply. The dinar was kept stable at around 1,170 per dollar from 2009 to 2014.^[1] Inflation stayed below 3% for most of the 2010s, partly because Iraq imports many goods and subsidises food and fuel.^[1][2]

After 2003 the dinar strengthened: the official rate moved from about 1,453 dinars per dollar in 2004 to 1,170 in 2009.^[1] A stronger currency made imports cheaper and helped bring inflation down. In 2023 the central bank again strengthened the official rate, to an average of about 1,313, and then 1,300 in 2024 and 2025.^[1]

Inflation was just 0.3% in 2025.^[1] The World Bank expects it to stay contained in 2026, at 2.5%.^[2] But the 2026 shock has hit the currency in a different way. Dollars became scarce, and the gap between the parallel (unofficial) exchange rate and the official rate widened to 18.3% in June 2026.^[2]

4.5 Public finances and dependence on oil

Iraq is one of the most oil-dependent states in the world. Oil provided 87.9% of government revenue in 2025, according to the World Bank.^[2] Iraq’s oil minister put the share of exports in the budget at more than 85%.^[19] Most spending goes on wages and pensions, which reached 22% of GDP in 2024, according to the IMF.^[4]

Debt tells a story of its own. When the invasion ended the old regime, Iraq inherited very large debts. The IMF estimates general government debt at 344% of GDP in 2004. As oil revenue and GDP rose, the ratio fell quickly, to 117% in 2007 and 32% in 2013.^[3] A rising denominator, GDP, can reduce a debt ratio even when the debt itself does not shrink much. The ISIS war and the oil crash then pushed the ratio back up.^[3]

This creates a “fiscal break-even” problem. The break-even oil price is the oil price at which the budget balances. The IMF estimates that it rose from about $54 a barrel in 2020 to about $84 in 2024.^[4] Brent averaged $69 in 2025, well below that level.^[14] So even before 2026, Iraq was running deficits. The World Bank estimates a deficit of 2.8% of GDP in 2025.^[2]

In 2026 the problem became acute. In January–May, revenue fell to 11.1% of GDP from 15.5% a year earlier, as oil revenue fell by 35.7%.^[2] The government cut capital spending by 46% but could not cut salaries.^[2] The IMF projects a deficit of 15.1% of GDP in 2026 and government debt of 71.1% of GDP.^[3] The World Bank projects a smaller deficit of 8.9% of GDP and debt of 69.8% of GDP.^[2]

4.6 Labour market

Oil produces a lot of revenue but few jobs. Instead, the state has become the main employer. The IMF has recommended limiting mandatory public hiring.^[4] The World Bank puts unemployment at about 13.5%, youth unemployment at 35.8% and labour-force participation at only 38% in 2025.^[2] The International Labour Organization’s modelled estimate shows unemployment rising from 8.3% in 2010 to 15.5% in 2025.^[1] Only about 35% of working-age people have a job.^[2]

4.7 Poverty and displacement

Displacement came in two great waves. In the sectarian violence, the number of Iraqi refugees abroad rose from about 260,000 in 2005 to 2.3 million in 2007, according to UNHCR.^[12] In the ISIS war, the number of internally displaced people (IDPs) rose to 4.4 million in 2015.^[12] When ISIS was defeated in December 2017, about 3.2 million people were still displaced, according to the UN.^[13] By the end of 2025 about 1 million remained internally displaced.^[12]

Poverty has fallen only slowly. Iraq’s national poverty rate was 18.9% in 2012 and 17.5% in 2023/24.^[2] Extreme poverty is very low, at about 0.4% under the $3.00-a-day line. But 23.7% of people lived below the $8.30-a-day line used for upper-middle-income countries in 2025, and the World Bank expects this to rise to 26.5% in 2027 as the 2026 shock hits households just above the line.^[2]

4.8 War spending and reconstruction aid

For the United States, the war was very expensive. The Congressional Research Service (CRS) estimates that Congress approved $815bn for Iraq operations between FY2003 and FY2014, about 51% of all post-9/11 war funding.^[5] Annual funding peaked at $144bn in FY2008, during the surge.^[5] The Costs of War project puts the US budgetary cost of the wars in Iraq and Syria at $1.79 trillion to date, rising to about $2.89 trillion when future care for veterans up to 2050 is included.^[6] The two estimates differ because they count different things.

The US also funded reconstruction. Congress approved a one-time $20bn for Iraq reconstruction in FY2004.^[5] In total, the US spent about $60bn on reconstruction, including about $25bn to train and equip Iraq’s security forces. The final report of the Special Inspector General for Iraq Reconstruction (SIGIR), published in March 2013, found that at least $8bn was wasted.^[7] One example was a wastewater plant in Fallujah. It was planned in 2004 to serve 100,000 people at a cost of $35m. It was finished in 2011 at a cost of $108m and served 38,400 people.^[7] The report concluded that “it was a mistake to launch a huge number of programs across numerous geographic and infrastructure sectors” and advised delaying big projects until security was reasonable.^[7]

4.9 The ISIS war and the cost of Mosul

The war against ISIS caused enormous physical damage. A Damage and Needs Assessment by Iraq’s Ministry of Planning and the World Bank estimated damage at $45.7bn in the areas affected by ISIS.^[9] It put reconstruction and recovery needs in the seven most affected governorates at $88.2bn.^[8] In Mosul alone, satellite analysis found about 8,500 homes and other residential buildings severely damaged or destroyed, mostly in the Old City. About 130 km of roads were damaged and five bridges over the Tigris were destroyed.^[8]

At the Kuwait International Conference for the Reconstruction of Iraq in February 2018, Iraq sought about $100bn over the next decade.^[9] Sixty-two governments and development banks mobilised nearly $30bn of support.^[8] That was about a third of the assessed needs. The World Bank’s commitments to Iraq rose to $4.7bn, up from $600m four years earlier.^[8]

5. What went well and what went wrong

What went well

• Oil production more than tripled after 2003, providing revenue to rebuild the state.^[15]
• Inflation was brought down from over 50% in 2006 to low single digits, and the dinar was kept stable for long periods.^[1]
• Foreign reserves were built up to about $100bn by 2024, giving Iraq a buffer for the 2026 shock.^[4]
• International support after ISIS, including World Bank projects to rebuild bridges, power and roads, helped restore services in liberated areas.^[8]
• In 2026, quick moves to re-route exports through Turkey and Syria softened the blow from Hormuz.^[2][16]

What went wrong

• Much US reconstruction money was wasted: at least $8bn, according to SIGIR.^[7]
• The economy did not diversify. Oil still provides about 88% of government revenue and 96% of exports.^[2]
• Spending rose in booms and had to be cut in busts, especially capital spending, which was cut by 46% in early 2026.^[2]
• The public wage bill grew to 22% of GDP, leaving little room for investment.^[4]
• Exports depended on a single sea route, so the Hormuz disruption cut exports by up to 97%.^[19]

6. The economics behind it

6.1 The resource curse

The “resource curse” is the idea that countries rich in natural resources often grow more slowly and have weaker institutions than expected. Oil revenue flows to the state, not to taxpayers, so the government has less need to build a broad tax system or answer to citizens. Iraq shows several symptoms. Oil makes up most revenue, the public sector is the main employer, and non-oil exports are tiny.^[2][4]

6.2 Dutch disease

Dutch disease happens when a resource boom raises the real exchange rate. Other export industries, such as manufacturing and farming, become less competitive. Iraq’s fixed exchange rate, combined with large oil earnings, made imports cheap and local production hard to sustain.

6.3 War and the production possibility curve

The ISIS war shifted Iraq’s production possibility curve inward by destroying capital in the north and west and displacing millions.^[8][12] But because the oil fields in the south kept working, total output did not collapse as it did in 2003. This shows why the location of damage matters as much as its size.

6.4 External shocks and aggregate demand

Oil-price crashes and the Hormuz closure are negative shocks to Iraq’s aggregate demand. Lower oil revenue means less government spending, the biggest part of demand. In an AD/AS diagram, AD shifts left and output falls. The multiplier effect makes the fall larger: unpaid salaries mean less spending in shops. Because the IMF and World Bank both expect oil exports to normalise, they forecast a strong rebound in 2027, a “V-shaped” recovery.^[2][3]

6.5 Aid effectiveness and absorptive capacity

Absorptive capacity is the ability of a country to use aid well. It depends on security, skilled officials and good planning. The SIGIR findings show what happens when large sums are spent faster than capacity allows: delays, cost overruns and projects that do not deliver.^[7]

7. Outlook and the way forward

Iraq’s outlook depends on three things: whether oil can flow, at what price, and whether the government reforms its finances.

• Rebound scenario: If Hormuz stays open and production returns to normal, the World Bank expects growth of 16.9% in 2027 and the IMF 19.0%.^[2][3] But this only restores lost output. Non-oil growth would be about 3% a year in 2027–28.^[2]
• Prolonged disruption: Continued regional conflict or blocked export routes would weaken the economy further.^[2] A senior finance ministry official warned that if disruption continued, salaries could not be paid on time.^[16]
• Debt build-up: Without reform, the World Bank expects deficits of about 5.1% of GDP in 2027–28 and debt of 75.5% of GDP by 2028.^[2] The IMF projects debt of 73.2% of GDP by 2031.^[3]

Reform priorities. The IMF recommends raising non-oil revenue through better tax collection, customs duties and a general sales tax. It also recommends limiting public hiring, reforming pensions, improving electricity billing and protecting investment spending.^[4] The World Bank stresses containing the wage bill, increasing non-oil revenue and reforming banks.^[2] Diversifying export routes, through pipelines to Turkey and Syria, is now a priority after 2026.^[16][17] The World Bank reports that some Iraqi petroleum products are already being carried through Syria for export from the Syrian port of Baniyas.^[21] New routes would reduce dependence on a single chokepoint, but they need large investment and stable relations with neighbours.

The largest lesson is that reconstruction is not only about rebuilding bridges. Iraq rebuilt its oil industry after 2003, but it did not build an economy that could survive a halt in oil exports. That vulnerability, more than any single war, shapes its future.

8. Exam-style questions

Glossary

• Absorptive capacity: a country’s ability to use aid or investment effectively.
• Break-even oil price: the oil price at which the government’s budget balances.
• Devaluation: a deliberate cut in the official value of a currency.
• Dutch disease: the decline of other export sectors after a resource boom raises the real exchange rate.
• Internally displaced person (IDP): someone forced from home who stays within their own country.
• Multiplier effect: the process by which a change in spending causes a larger change in total income.
• Oil rents: the value of oil output minus the cost of producing it.
• Parallel exchange rate: the unofficial market rate for a currency.
• Procyclical fiscal policy: spending more in booms and less in slumps.
• Resource curse: the tendency of some resource-rich countries to grow slowly and have weak institutions.
• Sanctions: restrictions on trade or finance imposed to pressure a government.

References

1. World Bank (2026). “World Development Indicators: Iraq” (GDP growth, GDP in current US$, GDP per capita, inflation, official exchange rate, oil rents, exports, unemployment, population). Data updated 8 October 2026, accessed 14 October 2026. https://api.worldbank.org/v2/country/IRQ/indicator/NY.GDP.MKTP.KD.ZG?format=json
2. World Bank (2026). “Iraq”. Macro Poverty Outlook, October 2026. https://thedocs.worldbank.org/en/doc/65cf93926fdb3ea23b72f277fc249a72-0500042021/related/mpo-irq.pdf
3. IMF (2026). “World Economic Outlook database, October 2026: real GDP growth, general government net lending/borrowing, general government gross debt” (IMF DataMapper, accessed 14 October 2026). International Monetary Fund. https://www.imf.org/external/datamapper/api/v1/NGDP_RPCH/IRQ
4. IMF (2025). “Iraq: IMF Executive Board Concludes 2025 Article IV Consultation”. Press Release No. 25/243, 8 July 2025. https://www.imf.org/en/news/articles/2025/07/08/pr-25243-iraq-imf-executive-board-concludes-2025-article-iv-consultation
5. Belasco, A. (2014). “The Cost of Iraq, Afghanistan, and Other Global War on Terror Operations Since 9/11”. Congressional Research Service, RL33110, 8 December 2014. https://sgp.fas.org/crs/natsec/RL33110.pdf
6. Crawford, N. C. (2023). “Blood and Treasure: United States Budgetary Costs and Human Costs of 20 Years of War in Iraq and Syria, 2003–2023”. Costs of War, Watson Institute, Brown University, 15 March 2023. https://costsofwar.watson.brown.edu/paper/blood-and-treasure-united-states-budgetary-costs-and-human-costs-20-years-war-iraq-and-syria
7. Peter, T. A. (2013). “How more than $8 billion in US taxpayers’ money went to waste in Iraq” (reporting SIGIR, Learning From Iraq: A Final Report). The Christian Science Monitor, 6 March 2013. https://www.csmonitor.com/World/Middle-East/2013/0306/How-more-than-8-billion-in-US-taxpayers-money-went-to-waste-in-Iraq
8. World Bank (2018). “Mosul Rising from the Rubble: World Bank Helps Iraqis Bring Back Life to Their Liberated Cities”. Feature story, 5 April 2018. https://www.worldbank.org/en/news/feature/2018/04/05/mosul-rising-from-the-rubble-world-bank-helps-iraqis-bring-back-life-to-their-liberated-cities
9. Voice of America (2018). “Iraq Seeks $100 Billion for Post-Islamic State Reconstruction”. February 2018. https://www.voanews.com/a/iraq-one-hundred-billion-dollars-post-islamic-state-reconstruction/4250422.html
10. US Government Accountability Office (2004). “United Nations: Observations on the Oil for Food Program and Iraq’s Food Security”. GAO-04-880T, testimony, 16 June 2004. https://www.govinfo.gov/content/pkg/GAOREPORTS-GAO-04-880T/html/GAOREPORTS-GAO-04-880T.htm
11. United Nations Office of the Iraq Programme (2003). Report on the Oil-for-Food Programme, 17 September 2003. https://www.un.org/depts/oip/background/latest/bvs030917.html
12. UNHCR (2026). “Refugee Data Finder: population figures, country of origin Iraq, 2003–2025”. Accessed 14 October 2026. https://api.unhcr.org/population/v1/population/?coo=IRQ&yearFrom=2003&yearTo=2025
13. Reuters, via Egypt Today (2017). “Iraq declares final victory over Islamic State”. 9 December 2017. https://www.egypttoday.com/Article/1/36195/Iraq-declares-final-victory-over-Islamic-State
14. US Energy Information Administration (2026). “Europe Brent Spot Price FOB, annual”. Accessed 14 October 2026. https://www.eia.gov/dnav/pet/hist/LeafHandler.ashx?n=PET&s=RBRTE&f=A
15. Energy Institute (2026). “Statistical Review of World Energy: oil production by country”, via Our World in Data. Accessed 14 October 2026. https://ourworldindata.org/grapher/oil-production-by-country
16. Mahmoud, S. (2026). “Iraq struggles with July salary payments as oil revenue fails to cover budget”. The National, 4 August 2026. https://thenationalnews.com/news/mena/2026/08/04/iraq-struggles-with-july-salary-payments-as-oil-revenue-fails-to-cover-budget
17. AGBI (2026). “Iraq budget deficit triples to $16bn as oil revenues slump”. August 2026. https://www.agbi.com/economy/2026/08/iraq-budget-deficit-triples-to-16bn-as-oil-revenues-slump/
18. AGBI (2026). “Iraq’s debt hits record high as Hormuz crisis drains revenues”. August 2026. https://www.agbi.com/economy/2026/08/iraqs-debt-hits-record-high-as-hormuz-crisis-drains-revenues/
19. Salem, A. (2026). “Iraq’s oil exports jump to two million barrels per day”. IraqiNews, 16 August 2026. https://www.iraqinews.com/iraq/iraqs-oil-exports-jump-to-two-million-barrels-per-day/
20. IraqiNews (2026). “Iraq’s oil exports hit three million barrels in September”. 20 September 2026. https://www.iraqinews.com/?p=238564
21. World Bank (2026). “Syrian Arab Republic”. Macro Poverty Outlook, October 2026. https://thedocs.worldbank.org/en/doc/65cf93926fdb3ea23b72f277fc249a72-0500042021/related/mpo-syr.pdf

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