Multi-account trading seems to be able to compare spreads and diversify platform risks, but it brings hidden costs such as accumulation of idle margin, friction in cross-account transfers, and increased management complexity. This article analyzes the gains and losses of multiple accounts from a cost perspective, discusses the opportunity cost of idle margin, the friction of deposits and withdrawals, and currency exchange, as well as when multiple accounts are truly cost-effective. It also provides optimization ideas for appropriate pooling of funds and main accounts to carry major transactions, helping traders to include hidden costs in the general ledger. The content is for reference only and does not constitute investment advice.

Multi-account trading seems to be able to compare spreads and diversify platform risks, but it will bring hidden costs such as idle margin accumulation, cross-account transfer friction and increased management complexity. This article analyzes the gains and losses of multiple accounts from a cost perspective, discusses the opportunity cost of idle margin, friction in deposits and withdrawals, and exchange, and under what circumstances multiple accounts are truly cost-effective. It also provides optimization ideas for appropriate pooling of funds and main accounts to carry major transactions, helping traders to include hidden costs in the general ledger. The content is for reference only and does not constitute investment advice.