Inflation, the current account and the budget under three conditional oil-price bands
ABSTRACT
This simulation tests under which oil-price environment the targets of Türkiye’s Medium-Term Programme (MTP) 2027–2029, announced on 6 September 2026, remain consistent. Three conditional Brent bands from September 2026 EIA and bank forecasts are matched with the MTP, the CBRT’s 10 September decision, expectations, Ember’s extra-cost estimate and the diesel excise schedule. The MTP’s inflation, current-account and budget targets require prices close to institutions’ normalisation references; in the chronic-disruption band they face upside risk, and in the escalation band the CBRT’s conditional tightening clause becomes likely to apply. With a war effect of about 7 points and household expectations at 45.6%, policy should follow a band’s duration, not its level. No probabilities are assigned.
1. Purpose and method
Türkiye’s 2027 outlook is being set while Hormuz transit has been restricted since March 2026; in August more than 10 mb/d of Gulf production was shut in (International Energy Agency [IEA], 2026). The MTP of 6 September raised the 2026 year-end inflation forecast from 16% to 28.4% (Euronews Türkçe, 2026). On 10 September the CBRT held the policy rate at 37% and stated that the monetary policy stance would be tightened in the event of a marked and persistent deterioration in the inflation outlook (Capital, 2026). This piece asks which oil-price environment keeps the MTP targets consistent and how policy should respond in each band. Scope is inflation, the current account and the budget in October 2026 and 2027; the 2026 disinflation path is not revisited.
Each band links a Gulf transit regime to an institution’s price reference; probabilities are not assigned and no new price forecast is produced. Çatık and Önder (2011) show with a regime-switching model that the inflationary effect of oil prices in Türkiye varies by regime rather than following a fixed coefficient, so pass-through observed with inflation above 30% cannot be carried linearly into lower-inflation periods. Özlale and Pekkurnaz (2010) treat the oil price as an exogenous determinant of Türkiye’s current account in a structural model. The fiscal channel is fuel taxation: a tax cut limits the price rise but costs revenue.
2. The published baseline
The MTP projects the current-account deficit falling from 2.3% of GDP in 2026 to 1.6% in 2029 and a budget deficit of 3.5% of GDP in 2027 (Dünya, 2026a). Its 2027 inflation target is reported as 21% by Euronews and 22% by Dünya (Euronews Türkçe, 2026; Dünya, 2026a); the conflict is not resolved here. Vice President Cevdet Yılmaz said the CBRT estimates the war’s direct and indirect effect on inflation at about 7 points (Euronews Türkçe, 2026).
According to the CBRT’s MPC summary, Brent averaged $91 in August and stood at $103 in early September, and household inflation expectations rose to 45.6% (Dünya, 2026b); the summary does not specify the Brent series. In the September Survey of Market Participants, 12-month-ahead expectations were 23.70%, 24-month-ahead 18.32% and the September monthly expectation 2.12% (Uzmanpara, 2026b).
The EIA assumes Middle East export constraints persist to year-end and regional output stays below its pre-war average until 2Q 2027, with Brent averaging $74 in 2027 (U.S. Energy Information Administration [EIA], 2026). HSBC says rebalancing could come in mid-2027 (Reuters, 2026). The buffer is thin: effective spare capacity fell to 0.22 mb/d and observed stocks have dropped by 507 mb since February (IEA, 2026).
3. The identifying assumption set
| Parameter | Value | Source |
|---|---|---|
| T1 Brent, August average / early September | $91 / $103 | Dünya (2026b) |
| T2 Band references for 2027 | A: $74 (EIA), $60s (Goldman Sachs); B: $85 (HSBC); C: above $120 (Goldman Sachs), ~$120 (HSBC deadlock) | EIA (2026); Reuters (2026) |
| T3 Energy imports 2015–2024 | $42 billion a year, 4.5% of GDP | Gümüş (2026) |
| T4 Extra 2026 cost of the Hormuz crisis | ~$14 billion (oil $7.7 billion, gas $6.4 billion) | Gümüş (2026) |
| T5 Diesel excise (ÖTV) per litre | 3 TL (September), 6, 9, 12 TL (October–December), 13.9006 TL (1 January 2027) | QNB Invest Araştırma (2026) |
| T6 Expected pump effect of the September 3 TL step | ~3.60 TL | Habertürk (2026) |
| T7 Istanbul diesel, 22 September | 96.30 TL/litre | Hisse.net (2026) |
The identifying assumption is that bands differ only through the Gulf transit regime; the exchange rate, non-energy prices and domestic demand stay at September conditions, as no sourced 2027 paths exist. Annual inflation rates are converted to monthly equivalents with m = (1 + π)^(1/12) − 1: the 21% and 22% targets require average monthly inflation of 1.60% and 1.67%, the 23.70% market expectation corresponds to 1.79%, and the 2.12% September expectation, if sustained for twelve months, compounds to 28.6%.
4. Branch A: Normalisation band
Condition: Gulf output recovers in 2027; Brent near the EIA’s $74 or Goldman Sachs’s $60s.
Mechanism: part of the 7-point war effect reverses through fuel and transport prices, and the energy bill returns toward its historical average.
Arithmetic: $74 is 18.7% below the August average and 28.2% below the early-September level (T1). Market expectations sit 1.7–2.7 points above the MTP target range (23.70 − 22 to 23.70 − 21). Falling energy prices work toward the required monthly pace of 1.60–1.67%, so reaching the target range becomes more likely.
Indicators: monthly CPI prints below 1.79% for consecutive months; 24-month expectations falling from 18.32%.
5. Branch B: Chronic-disruption band
Condition: the strait is neither fully closed nor fully open; Brent near HSBC’s $85.
Mechanism: the 7-point war effect largely persists. Following Çatık and Önder (2011), with household expectations at 45.6% the decline in inflation can be slower than the decline in prices.
Arithmetic: $85 is only 6.6% below the August average, so the energy environment of late summer 2026 broadly continues. Ember’s extra cost equals one-third of the average annual import bill (14 / 42). Scaled by Ember’s own ratio of imports to GDP, it corresponds to about 1.5% of GDP (14 × 4.5 / 42), roughly twice the 0.7-point current-account improvement the MTP plans for 2026–2029 (2.3 − 1.6). A cost of this size persisting into 2027 would require extra improvement in the non-energy balance; since oil is an exogenous determinant (Özlale & Pekkurnaz, 2010), the target rests on an assumption outside policy control.
Indicators: monthly CPI near 2%; household expectations staying at 45.6% or above; the August balance-of-payments energy component.
6. Branch C: Escalation band
Condition: Gulf output remains 4 mb/d below pre-war or infrastructure damage widens; Brent above $120.
Mechanism: the CBRT’s tightening clause and pressure to defer the excise schedule collide in a direct fiscal–monetary tension.
Arithmetic: $120 is 31.9% above the August average and 16.5% above the early-September level. The expected effect of the September step implies about 1.2 TL at the pump per TL of excise (3.60 / 3, inferred from T5 and T6). The remaining steps to January 2027 add 10.9006 TL of excise (13.9006 − 3), or about 13.08 TL at the pump: 13.6% of the 22 September Istanbul price, holding the pre-tax price constant. Deferring the schedule removes that increment but moves the budget away from the 3.5% deficit target; the MTP’s fuel-excise assumption is not stated in the sources reviewed.
Indicators: Brent above $120 on futures settlement for more than a month; any announcement amending the diesel schedule; a rate change at the 22 October or 10 December MPC.
7. Failure conditions and limitations
The structure fails if the exchange rate or domestic demand moves independently of oil. The 1.5%-of-GDP figure uses the 2015–2024 GDP denominator implied by Ember and overstates the share for 2027 dollar GDP. The pump arithmetic assumes the September pass-through ratio holds. The 2027 inflation target exists in two versions, and no excise revenue figures are available, so the fiscal cost of deferral cannot be quantified.
8. Outlook: Türkiye, Saudi Arabia and the World
Seven OPEC+ members meet on 4 October to set November output (ANI, 2026). TurkStat publishes September inflation on 5 October against a 2.12% expectation (Uzmanpara, 2026b). The EIA’s October outlook appears on 6 October (EIA, 2026). The CBRT’s next MPC meetings are on 22 October and 10 December (Uzmanpara, 2026a).
For Türkiye, a September print clearly above expectation, combined with October’s 6 TL diesel step, could bring the tightening condition into discussion on 22 October; a print near expectation is consistent with holding at 37%. The decisive 2027 choice is whether the excise schedule is kept.
Saudi Arabia is the central variable: its output fell from 8.24 mb/d in July to 5.97 mb/d in August (IEA, 2026), against a required October level of 10.478 mb/d under the OPEC+ decision (ANI, 2026). That gap limits the 4 October decision’s price effect, and the Gulf output variable separating Goldman Sachs’s bands depends largely on Saudi recovery.
Globally, the IEA expects demand to recover by 2.6 mb/d in 2027 after a 2.5 mb/d fall (IEA, 2026); if demand recovers before supply, Branch A is delayed.
9. Conclusion
The MTP’s 2027 targets are consistent with a price environment near the EIA’s $74 and banks’ normalisation references. In HSBC’s $85 band the CBRT’s 7-point war effect persists and an Ember-sized extra cost would equal about twice the planned current-account improvement. Above $120, the CBRT’s tightening clause and deferral of the excise schedule pull in opposite directions. The response should follow the shock’s duration, not its level: a short spike can be met with the tax schedule and an unchanged rate, while chronic disruption works through expectations, with households at 45.6%, and makes the CBRT’s marked-and-persistent condition more likely to be met.
SOURCES
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Furkan Mahmut Tameroglu