Regional Banks Cut Bond Rate Risk Ahead of AOCI Capital Rule

Truist Financial (TFC), M&T Bank (MTB) and Regions Financial (RF) all said on their third-quarter 2026 earnings calls on October 16, 2026 that a pending US capital rule could push unrealized losses on available-for-sale bonds into core capital. In response, each bank cut or fenced off part of its long-dated bond exposure this quarter: Truist sold, M&T reclassified and Regions hedged [1][2][3].

Why bond losses are moving into bank capital

Banks invest part of their deposits in bonds, commonly agency mortgage-backed securities (MBS) guaranteed by US government-sponsored agencies. If a bank classifies those bonds as available-for-sale (AFS), it carries them at market value, and the gains and losses flow into accumulated other comprehensive income (AOCI), a line in shareholders' equity. Bonds classified as held-to-maturity (HTM) stay at cost and are not remeasured. For banks with more than $100 billion in assets that are not in the largest tier, AFS losses today reduce tangible book value but are not counted in the common equity tier 1 (CET1) ratio, the capital measure regulators watch most closely [2].

In March 2026, US banking agencies re-proposed the Basel III capital rules, including a plan to phase AFS AOCI into CET1 over five years [4]. The Federal Reserve then raised rates in September, Treasury yields rose, and long bonds bought when rates were low lost value, widening those unrealized losses [5]. A loss that once only dented book value is becoming a future deduction from regulatory capital, so banks have started to reduce the rate exposure of their long-dated bonds. Every bank in the same tier faces the same rule, so this adjustment could spread to peers.

Three banks, three ways to shrink AFS rate risk

Truist chose to sell long bonds and buy shorter ones. It sold $8.6 billion of agency MBS with a 2.67% book yield and a 5.8-year duration, then bought $7.2 billion of securities that yield about 5.6% with a 2.3-year duration after new pay-fixed swaps [1]. Duration measures how sensitive a bond's price is to interest rates; the higher the number, the more the price falls when rates rise. The sale booked a $1.4 billion pre-tax loss, and management said another $17 billion to $18 billion of AFS securities could be actionable. The CEO said plainly that AOCI "will be in your capital soon enough anyway" [1].

M&T and Regions did not sell bonds; they changed the accounting classification or added hedges. M&T said that if AOCI were included in regulatory capital, the drag on its CET1 ratio would have widened from 2 basis points in the second quarter to 29 basis points in the third [6][2]. It moved $8.3 billion of residential MBS from AFS to HTM and also cited rating agencies as a consideration [2]. Regions added fair value hedges this quarter to protect capital if rates rise. Including AOCI and the proposed Basel III risk-weighted asset changes, it estimated its CET1 ratio at about 10%, still above its 9.25% to 9.75% target range [3].

Bank buybacks now move with rates, but not every large bank is adjusting

Once AOCI counts in capital, higher rates directly shrink the room for share buybacks. U.S. Bancorp (USB), which already calculates capital on this basis, offers a reference point: its AOCI-adjusted CET1 ratio fell 30 basis points to 9.1%, the third-quarter rate move cut it by another 40 basis points, and the bank expects to resume repurchases over the next quarter or two [7]. Truist also cited the rate environment in trimming its fourth-quarter buyback outlook to about $1 billion from $1.2 billion [1]. Shortening duration has a cost: realized losses on bond sales hit current-period income, and swaps reduce the extra interest income that further rate hikes would bring.

This reading has clear limits. PNC Financial (PNC), in the same tier, grew its securities by $4 billion this quarter, kept duration at 4.1 years and held its fourth-quarter buyback; management argues that relief on risk-weighted assets under the new rules, about one percentage point, offsets the AOCI hit [8]. Truist was also selling loans and reworking its strategy when it sold the bonds, so the rule is not the only driver [1]. Metrics to watch are each bank's AFS duration, the share of securities held to maturity, AOCI-inclusive CET1 and quarterly buyback amounts.

Which other companies are exposed

• Citizens Financial Group (CFG): A regional bank with about $220 billion in assets that also holds AFS securities. In the second quarter, management estimated that Basel III risk-weighted asset relief would still add a net 50 to 60 basis points to CET1 after AOCI is fully phased in [9], but that estimate predates the third-quarter rate rise, and its response this quarter cannot yet be verified.
• KeyCorp (KEY): A regional bank with about $190 billion in assets that plans $1.3 billion of buybacks in 2026. Management has so far cited only a capital benefit of about 100 basis points from the new rules, and it has not disclosed whether buybacks would change once AOCI counts in capital [10].

Sources

[1] Drillr · Truist Financial (TFC) · 2026-10-16 · Q3 2026 earnings call

we're looking through to the future Basel III rules and whether the AOCI comes through the Tier 1 common or not, it sort of changes the dynamic of how you think about earnbacks and the like because it'll be in your capital soon enough anyway.

[2] Drillr · M&T Bank (MTB) · 2026-10-16 · Q3 2026 earnings call

[3] Drillr · Regions Financial (RF) · 2026-10-16 · Q3 2026 earnings call

[4] Simpson Thacher · Basel III Endgame Evolution: Banking Agencies Propose Major Capital Overhaul Again · 2026-03-20 · Law firm memo · https://www.stblaw.com/about-us/publications/view/2026/03/20/basel-iii-endgame-evolution-banking-agencies-propose-major-capital-overhaul-again

[5] Reuters (via Kitco) · Major US banks post solid third quarter loan growth, see more competition for deposits · 2026-10-13 · News report · https://www.kitco.com/news/off-the-wire/2026-10-13/major-us-banks-post-solid-third-quarter-loan-growth-see-more

[6] Drillr · M&T Bank (MTB) · 2026-07-15 · Q2 2026 earnings call

[7] Drillr · U.S. Bancorp (USB) · 2026-10-15 · Q3 2026 earnings call

[8] Drillr · PNC Financial (PNC) · 2026-10-15 · Q3 2026 earnings call

[9] Drillr · Citizens Financial Group (CFG) · 2026-07-16 · Q2 2026 earnings call

[10] Drillr · KeyCorp (KEY) · 2026-07-21 · Q2 2026 earnings call

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