When we ask about forms you had last year but have not sent this year, we are using one of the most practical quality-control tools in return preparation: year-over-year comparison. Prior-year forms often reveal recurring income sources, withholding patterns, bank relationships, and payor activity that may reasonably continue into the current year. If one of those items disappears, it may mean the income genuinely stopped — or it may mean the form has not arrived, was overlooked, was issued under a slightly different name, or was never downloaded.

This question matters because document gaps are one of the leading causes of incomplete returns. Taxpayers naturally focus on what is in front of them now. Preparers, by contrast, often improve accuracy by comparing the current package to the prior year. If a client always has a certain brokerage form, a recurring agency statement, a retirement distribution form, or a foreign reporting statement, and it is suddenly absent, that is worth asking about before the return is filed.

The goal here is not to assume the prior year will repeat mechanically. Income sources change. Accounts close. Jobs end. But a missing document that is explained is very different from a missing document that is never considered. A simple confirmation — that account was closed or that payer no longer used me — resolves the issue cleanly.

This review is also useful because tax forms often arrive late, especially corrected forms or documents from institutions that rely on online delivery. A client may believe they sent everything because they sent everything they had as of that day. But if we see that a prior-year pattern is incomplete, we can tell them exactly what seems missing.

Another reason this question matters is withholding. Sometimes a form that seems minor actually carries federal or state withholding that would otherwise be missed. If the document never gets included, the income and the withholding can both disappear from the return preparation process.

This question also helps us identify whether a different form type replaced the old one. For example, a payer may shift reporting systems, change platforms, or issue the same basic economic item through a different document type.

The most helpful response is straightforward. If the prior-year form really does not apply this year, tell us why. If you think it should exist but have not received it yet, tell us that too. The key is closing the loop before filing, not after.

In short, we ask about forms that existed last year but have not appeared this year because comparison is one of the best ways to detect omissions before they become filing problems.