QB Issue Resolution:
Realized Gains isn’t a subaccount; that got put into the same Account that you are tracking. The Offset is Income/Loss expense, not Schwab balance offsetting its own subaccount.
Yes, it works best as Bank, which is a type of asset. Then you would enter the Deposit that you earned Interest, for instance. Or, your Gain is because you sold a holding = Deposit for the entire sale, posting to Basis of that holding and to Gain for that difference above Basis.
All of this is why QB isn’t the best tool to manage investments. Quicken has built in purchase and sales and FMV tracking.
Is this account owned by the Business Entity, or your personal investment account? You don’t track personal investments in your Business data file.
Resolution for Issue 'What should I select as my account type when adding a brokerage account? If I do not set it up as a bank account, can I still have transactions automatically post?' available: Yes (Solved).
Source: Intuit Community forum.
What should I select as my account type when adding a brokerage account? If I do not set it up as a bank account, can I still have transactions automatically post?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.Support for Bank Account
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