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@Kenneth1 wrote:

This is a form that needs to be prepared to submit with the 1040.

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@Kenneth1 Like I said, F.3520 is not to be filed with F.1040.  You may like to read the instructions for both F.1040 and F.3520 again.

Lacerte does not prepare all forms.  There are different modules and Lacerte has most of the typical forms and schedules that need to be filed with each particular type of return.

We specialize in international tax and would love to have more international forms supported.  When it comes to international returns, Lacerte/ProConnect Tax do ok compared to other similarly-priced products but are not stellar compared to the higher-end software (think F.8621 and GILTI).  Until those core functionalities are improved, I wouldn't expect much by way of support for forms such as F.3520 which are not technically part of an income tax return.

In the meantime, you may like to use other ah-hoc products.  Since F.3520 is relatively straightfoward and the crux of the work is really in data gathering, products like IntelliForms will do just fine (if you don't want to do basic form-fill with PDF files downloaded from the IRS' website).