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I received ownership of a mutual fund account from my father about 15 years ago which I have continued using. Turbotax has just started asking me this year how I received the investments that were sold. A large amount of money was in the account when I obtained it but I have also been putting money into the account every month since I received it. At this point I have probably sold far more assets from the account than were in the account initially but how can I determine if a sale included investments that were from the initial transfer or bought by me?

The 1099B indicates the Cost Basis Method is ACST and the date acquired field is empty. By that method, it seems to me that I'll never be able to fully determine which assets were gifted or purchased unless I completely cash out the account and start over.

How do I report this on my taxes?

Edit 1: FMV for Cost Basis enter image description here

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It doesn't matter (especially with the ACST cost basis calculation). It would matter if it was inheritance. Given that you said it's a gift - it doesn't.

For ACST, the fund divides the total amount invested by the total shares held, and that's the cost basis for your sale transaction. It's recalculated (for the whole holding) every time you make a new purchase. See the IRS Pub 550.

Gifted property retains the original tax basis, and the fund averages the cost bases, so it doesn't matter to you for the purpose of capital gains calculation whether it was part of the original gift from your father or the subsequent purchase you made yourself - it's all bundled together in the same average.


Your additional screenshot shows that in some cases it does in fact matter, if you can track it correctly.

Here's the thing: FMV (fair market value) at the time of transfer may affect how the gain/loss is calculated, as described in the screenshot.

To be able to take it into account though you'd need to recalculate the ACST cost basis using the FMV instead of the original purchase price for the gifted shares. For that, you'll need to know how many shares were in fact gifted, and their value on the day of transfer (if you know the first, you can contact the fund for the second). You'll then add all the additional shares you've purchased over time and their prices and average it all into a new ACST value that you'd need to fill on this screen.

If the sale price is more than the original cost, then this whole exercise would be a complete waste of time. Without knowing the details of the fund, I'm guessing that after 15 years it is likely not being at a loss from the original purchase.

Given that you're talking about gains, your sale price is more than the original cost (using ACST). So in this case it still doesn't matter and you can safely select the second option.

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  • Given that Turbotax requires that I indicate whether it's a gift or purchased, what would be the best way to answer? Selecting gift seems to trigger more unanswerable questions. Is it legal/ethical to select 'purchased'? Commented Mar 18, 2023 at 3:38
  • @duct_tape_coder hmmm... I'd try to see what other unanswerable questions there may be... It's definitely legal/ethical to answer "purchased" since it doesn't actually matter for tax cost basis. I don't have TT access to see where that interview would take you, so give it a try? You can always go back and change the answer
    – littleadv
    Commented Mar 18, 2023 at 3:41
  • Please see figure 1 added to the question. When 'gift' is selected, it wants me to review the cost basis. Presumably the sale value is in 1d? Unfortunately I have no way of knowing the original cost or FMV to use as the basis. If I select the second option, it seems to end the questions, perhaps that's the way to go. Commented Mar 18, 2023 at 3:56
  • @duct_tape_coder thanks for that, it explains why it does in fact matter (in some cases, probably not in yours)
    – littleadv
    Commented Mar 18, 2023 at 6:33

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