The IETF Administration LLC publishes monthly statements, meeting statements, and annual budgets.
IETF LLC 2020 Budget (See also Budget Narrative blog post)IETF LLC 2019 Budget
2020 Chart of Accounts2019 Chart of Accounts2018 Chart of Accounts
Please note that it takes several months for all meeting-related expenses to be reconciled, so statements will not be posted immediately after the meeting occurred.
IETF 104 - PragueIETF 103 - BangkokIETF 102 - Montreal