The transfer balance cap is the limit on the total amount of superannuation that can be transferred into the retirement phase.
From 1 July 2025, the amount you can transfer into the retirement phase is $2m for new account based pension accounts.
Source: https://www.ato.gov.au/individuals-and-families/super-for-individuals-and-families/super/withdrawing-and-using-your-super/retirement-withdrawal-lump-sum-or-income-stream/transfer-balance-account
https://www.ato.gov.au/tax-rates-and-codes/key-superannuation-rates-and-thresholds/transfer-balance-cap