USD/TRY reaches 50.00 by October 31, 2026 in the base case, 50.75 in the bull case and 49.30 in the bear case, because the Central Bank of the Republic of Türkiye (CBRT) cut the rate that actually funds the lira by 300 basis points on August 23, 2026 without touching the policy rate everyone quotes.

The European Central Bank (ECB) reference cross closed at 48.245 on August 28, 2026, up 12.12% from 43.028 on January 2. The policy rate read 37.00% throughout, but the CBRT’s own Inflation Report says the weighted average funding cost “was kept at 40%” until it restarted one-week repo auctions on August 23. That gap is what this call trades on.

Key Levels:

• USD/TRY: 48.245 on August 28, 2026 — ECB euro reference rates, USD and TRY legs crossed
• Base case: 50.00 by October 31, 2026 — a 20.75% annualised pace, against 19.8% since March 2
• Bull case: 50.75 by October 31 — if the September 10 Monetary Policy Committee (MPC) cuts
• Bear case: 49.30 by October 31 — if the CBRT re-suspends auctions, restoring January’s 12.5% pace
• Major support: 47.525 — the July 31 ECB fix, August’s low, never revisited
• Consensus check: 51.6567 — CBRT Survey of Market Participants end-2026 expectation
• Invalidation: two consecutive Friday ECB fixings lower — zero occurrences in 33 Friday fixings this year

Methodology and its limits

All exchange-rate levels are ECB euro reference rates, crossed from the USD and TRY legs, January 2 to August 28, 2026 — 168 fixings. These are reference fixings, not tradeable mid-market quotes: no bid-offer, no intraday range, and Turkish onshore spot can diverge. Policy rates, funding statements, inflation prints and survey figures come directly from CBRT publications, dated in the text. Annualised paces are simple-interest extrapolations computed by this desk, and carry figures allow nothing for bank spreads or swap basis.

What the tape shows: a monotone series with a Friday step

USD/TRY has not fallen in a single week this year. Across 33 Friday reference fixings in 2026, the count of week-on-week declines is zero. Within August the series was almost as clean: 19 of the 20 day-on-day moves printed higher, the sole exception a 0.023% dip on August 10. What makes the month unusual is where the movement sat. The four August Fridays averaged +0.233% each — August 7 at +0.233%, August 14 at +0.228%, August 21 at +0.236% and August 28 at +0.237%. Mondays averaged +0.017%, Tuesdays +0.042%, Wednesdays +0.047% and Thursdays +0.036%. One weekday carried roughly five times the daily move of every other. That regularity is a property of the reference fix rather than a tradeable pattern, but it does mean the bulk of the monthly total is concentrated in just four of the month’s 20 prints.

Month-end ECB fix	USD/TRY	Change	Annualised pace	CBRT funding regime
January 30	43.487	+1.21%	14.8%	1-week repo auctions running
February 27	43.960	+1.09%	14.2%	1-week repo auctions running
March 31	44.480	+1.18%	13.5%	Auctions suspended March 2
April 30	45.185	+1.58%	19.3%	Funded at 40% O/N lending
May 29	45.886	+1.55%	19.5%	Funded at 40% O/N lending
June 30	46.660	+1.69%	19.2%	Funded at 40% O/N lending
July 31	47.525	+1.85%	21.8%	Funded at 40% O/N lending
August 28	48.245	+1.51%	19.7%	Auctions restarted August 23

Sources: ECB euro reference rates, 2026; CBRT press releases 2026-11 and 2026-35; CBRT Inflation Report 2026-III. Annualised pace computed by this desk.

The regime split is the finding. The three months still auctioning one-week repo ran at 14.8%, 14.2% and 13.5% annualised, averaging 14.2%. The five funded at 40% ran at 19.3%, 19.5%, 19.2%, 21.8% and 19.7%, averaging 19.9%. A 300-basis-point rise in effective funding coincided with roughly 570 basis points of acceleration, not a deceleration. And in the five sessions since the restart the pace has not slowed: +0.372% from August 21 to August 28, or 19.4% annualised.

“In order to support the tight monetary policy stance, we have not conducted one-week repo auctions since the previous reporting period. We have continued to meet the market’s liquidity need through overnight funding at the upper band. […] Through our effective liquidity management, we ensure that the interest rates in money markets materialize at nearly 40 percent.”

— Fatih Karahan, Governor, Central Bank of the Republic of Türkiye, at the Inflation Report 2026-III briefing, August 13, 2026 (CBRT)

The mechanism: a 300-basis-point cut that never reached the rate table

The corridor has been static since January 23, 2026: one-week repo at 37.00%, overnight lending at 40.00%, overnight borrowing at 35.50%, per the bank’s own rate history. What changed twice was which of those rates the market paid. On March 1 the CBRT “decided to suspend the one-week repo auctions for a period of time” (2026-11); on August 23 it decided “to resume the one-week repo auctions that were suspended on March 1, 2026” (2026-35). Neither contains a number. Both moved marginal lira funding by the corridor’s full 300 basis points.

Carry arithmetic makes the consequence concrete. Between July 31 and August 21, funding at 40% earned 2.301% over 21 days against 1.138% of depreciation, a net of 1.163 percentage points. Between August 21 and August 28, funding at 37% earned 0.710% over seven days against 0.372% of depreciation, a net of 0.337 points. Annualised, the pre-restart net carry was roughly 20.2 points; post-restart it is roughly 17.6. Close to 87% of the cut passed straight through to the carry, because the depreciation rate did not move to absorb any of it. The cushion got thinner and the currency did not slow down. The CBRT’s own August Survey of Market Participants, run August 10 to 12 among 68 respondents, put the expected end-August Borsa İstanbul overnight repo rate at exactly 40.00% — the ceiling, not the policy rate.

The other side is straightforward. A float walking at a stable 19% to 20% while reserves build is a policy outcome, not a failure, and the same survey expects a hold at 37.00% on September 10 then cuts to 36.13% and 35.25%. On that path the slide is priced and deliberate, much like the fixing-managed drift in USD/CNH. A carry clearing 17 points a year is not broken.

What the model misses

The March suspension did not happen in a vacuum. The CBRT’s stated reason was “the developments in financial markets”, and Karahan attributes the tightening to “the impact of the war and geopolitical developments prevailing since early March”. The shock that forced the suspension plausibly drove the faster depreciation too, so reading the table as though funding moved the currency may invert the relationship. The narrower claim holds: whatever produced the April-to-August regime, the August 23 cut has not reversed it. The reserve build cuts the same way — Karahan said gross reserves rose from 155 billion dollars on March 27 to 185 billion on August 12, net of swaps up 35 billion to 56 billion. And five sessions is a thin sample.

“Supply-side pressures slowed the pace of disinflation. […] Weakening demand conditions are supporting disinflation in services.”

— Gazi İshak Kara, Deputy Governor, Central Bank of the Republic of Türkiye, presentation on “In-Depth Analysis of Turkish Inflation Dynamics”, Istanbul, July 10, 2026 (CBRT)

Kara’s framing is the strongest counter-argument available: if inflation is set by food, energy and administered prices rather than the exchange rate, the currency channel matters less than a carry model implies. July consumer price index (CPI) data supports him in part — prices rose 1.78% month on month and 31.75% year on year, down from June’s 32.11%, per CBRT statistics. The bank forecasts 28% at end-2026 against a 24% interim target.

What would invalidate this call

The base case to 50.00 by October 31 breaks if any one of these four signals fires:

• Another liquidity-management notice re-suspends one-week repo auctions. That restores 40% funding and roughly 300 basis points of carry — the change most likely to pull the series back toward its January pace.
• Two consecutive Friday ECB fixings print lower. It has not happened once in 33 Friday fixings this year, so a back-to-back decline would falsify the monotone-drift premise.
• The September 10 MPC hikes, or says funding will run at the upper band. Consensus is a hold at 37.00%; a hawkish surprise widens the carry rather than compressing it.
• August CPI prints below 1.50% month on month. The survey looks for 1.67%; a softer print validates the disinflation path and removes the inflation leg.

What to watch next

The Turkish Statistical Institute (TurkStat) publishes August CPI in the first days of September; the survey median of 1.67% would, on July’s base, take annual inflation to roughly 31.3%. The MPC meets September 10, summary due September 17, per the published 2026 committee calendar. Between those, the CBRT press-release index is the highest-value feed here: a liquidity notice moves effective funding without moving a published rate. On levels, 47.525 has not been retested and 48.1893 is exceeded. Comparable setups sit in this desk’s work on USD/MXN, USD/ZAR and EUR/JPY.

Frequently asked questions

Why does a repo-auction restart matter more than the policy rate?

Because it changes what banks pay. With auctions suspended from March 2 to August 23, 2026, the CBRT met the system’s liquidity need at its 40.00% overnight lending rate, not the 37.00% policy rate. Restarting them moved marginal funding back toward 37.00%. The corridor never moved; the funding rate moved 300 basis points twice.

Where do the USD/TRY levels here come from?

They are ECB euro reference rates, crossed from the USD and TRY legs, covering 168 fixings from January 2 to August 28, 2026. These are published once per day, are not tradeable mid-market quotes, and carry no bid-offer spread. Turkish onshore spot can differ, particularly intraday.

What does the CBRT’s own survey expect for the lira?

The August 2026 Survey of Market Participants, run August 10 to 12 among 68 respondents, put USD/TRY at 48.1893 at end-August, 51.6567 at end-2026 and 57.4278 twelve months ahead. The end-August figure was exceeded on the August 28 fix of 48.245.

Is the lira’s decline accelerating?

Not in the raw tape: 19.8% annualised from July 31 to August 21, 19.4% from August 21 to August 28. The change is in the carry, not the currency — funding fell 300 basis points while depreciation held its pace, so the net cushion compressed from roughly 20.2 to 17.6 annualised points.

This article is informational analysis only and is not financial, investment, or trading advice. Foreign-exchange, commodity, and equity markets are highly volatile and can lose substantial value rapidly. Leveraged products carry total-loss risk and may exceed the initial margin posted. Past performance and historical correlations do not guarantee future results. Do your own research and consult a regulated financial adviser before making any investment decision.