Tier 1
From ACT Wiki
Banking - capital adequacy.
(T1).
Tier 1 is the highest quality capital.
Contrasted with Tier 2, which is of lower quality.
Tier 1 is sometimes known as 'going concern' loss absorbing capital.
Tier 1 principally comprises equity, subject to regulatory deductions and the inclusion of some preferred shares and some perpetual bonds.
Tier 1 capital is classified as Common Equity Tier 1 (CET1) or Additional Tier 1 (AT1) according to its loss-absorbing quality.
Tier 2 capital comprises eligible long dated subordinated debt.
(Tier 2 is sometimes known as 'gone concern' loss absorbing capital.)