The reason why it is necessary to have a w-2 or 1099 form when using tax preparation software is to:
According to the given question, we are asked to show the reason why it is necessary to have a W-2 or 1099 form when a software engineer is preparing software.
As a result of this, we can see that these two forms are both used by the Internal Revenue Service so that individuals such as the software engineer can report their income and make their tax payments.
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