IGCP Books Up to €1.5 Billion in OT Auctions for 13 May 2026 — 4-Year October 2030 Line Returns Alongside the 10-Year June 2036 Tap as Brent Cracks Below $100

The Agência de Gestão da Tesouraria e da Dívida Pública confirmed on Friday, 8 May 2026, that it will hold a double Obrigações do Tesouro auction next Wednesday, 13 May, with an indicative range of €1.25 billion to €1.5 billion split between the four-year OT 0.475% maturing 18 October 2030 and the ten-year OT 3.25% maturing 13 June 2036. The placement lands into a market that has just watched Brent crude crack below $100 a barrel on the Trump-Iran Hormuz de-escalation, removing the energy-shock premium that had widened peripheral spreads through April, and follows the 8 April auction in which IGCP placed €745 million of the same 2036 line at a yield of 3.304% with a bid-to-cover of 1.80x.

The two lines and the indicative range

The announcement names two existing OT lines rather than a new benchmark issuance. The four-year leg is the OT 0.475% 18 October 2030 — a low-coupon line carved during the 2020 pandemic-rate window that now trades at a meaningful discount to par because the secondary market clears at yields well above the 0.475% nominal coupon. The ten-year leg is the OT 3.25% 13 June 2036, the new benchmark line that IGCP launched earlier this year and has been tapping at successive auctions through the spring. The €1.25–€1.5 billion combined indicative range leaves IGCP with the standard non-competitive add-on window for primary dealers on Thursday, 14 May, on top of whatever clears in the competitive auction itself.

The 8 April benchmark on the 2036 line

The most recent stand-alone auction of the OT 3.25% June 2036 was on 8 April 2026, when IGCP placed €745 million at an average yield of 3.304% — a print that came in roughly thirty basis points wider than the equivalent German Bund and inside Italy on the day. Demand reached €1.342 billion for a bid-to-cover of 1.80x, a respectable read for a tap auction in a week marked by Iran-related risk-off flows. The yield curve has since tightened; if Brent stays in double digits and the ECB's 5 June meeting confirms the 25-basis-point cut already priced in, IGCP should print a lower yield on Wednesday's clearing.

Where the 2026 funding programme stands

The Conselho de Ministros authorised IGCP at the start of the year to issue up to €24 billion in OT in 2026 — a 16.5% increase on the 2025 envelope, driven by the heavier redemption schedule and the Compete 2030 / PRR co-financing flows that come due. On top of the OT line, IGCP is allowed to issue €5.1 billion net in BT (Treasury Bills, the short end of the curve) and continues to run the open subscription window on Certificados de Aforro and Certificados do Tesouro, the two retail savings products which crossed €41 billion in March 2026. Including the previous 2026 OT auctions, Wednesday's print is expected to put the agency past the halfway mark on its 2026 OT programme.

Why this auction matters for foreign residents

OT auctions are the institutional plumbing that sets the borrowing cost of the Portuguese state, but their effect cascades into private finance fairly directly. Mortgage-rate fixings on euro-denominated home loans are pegged to the Euribor curve, and Euribor itself trades as a function of where the ECB sets policy and where peripheral sovereigns clear; Portugal's spread is one of the inputs banks use when they price spreads on housing credit. A clean €1.5 billion print at a tighter spread to Bunds takes pressure off the upper end of mortgage spreads. The retail substitute — Certificados de Aforro at the headline 2.5% rate, capped to €100,000 per holder — has been pulling household savings out of bank deposits since the 2024 rate-cut cycle, and the IGCP retail line is one reason CGD's deposit base has been growing slower than its ECB-rate-driven net-interest-margin compression.

What to watch on Wednesday

• Yield on the OT 0.475% 2030 leg: the four-year benchmark has not been auctioned often this year, so the print sets a fresh reference for non-residents who buy short-duration peripheral paper as a euro-deposit alternative.
• Bid-to-cover on the OT 3.25% 2036 leg: a print above 2.0x would confirm that the Iran-Hormuz risk-off flow has fully cleared; below 1.5x would be a tell that the upcoming ECB meeting is being read as more hawkish than priced.
• Any Lusa-confirmed comment from IGCP president Miguel Martín: the agency rarely comments around auctions, but if questioned about the 2026 programme half-way mark and the syndicated-issuance pipeline for the second half, the answer flags whether IGCP plans to come to market with a long-dated benchmark on the 2055 or 2060 line before year-end.

Settlement of the 13 May auction lands two business days later, on Friday, 15 May. Primary-dealer non-competitive top-up demand prints separately on Thursday, 14 May.