<prompt> Human: Basic scenario: my money is in fund A, and I would prefer it was in fund B. If I transfer them from A to B, how can I know what the costs will be ahead of time  <response>: The answer will depend on a number of factors, including what brokerage or custodian you are using, whether the funds are commission or fee free, and what the custodian charges to make trades. If the holdings are in a retirement account there may be little or no cost, and no capital gains to account for. If its not in a tax-advantaged account, then selling fund A would incur some kind of capital gain or loss depending on how much you bought it for, and that would be taxable at short-term or long-term capital gains rates.You can research fees and costs associated with various vendors; they typically have a summary page for this information online. Here are a few:Fidelity Schwab Vanguard 