Should I Staple My W2 To My Tax Return?

When It Makes Sense

• Good fit: You are submitting a paper Form 1040 by mail and the IRS instructions for that year specifically allow a single staple on the top‑right corner of the return to keep the W‑2 attached.
• Good fit: You are filing an amendment (Form 1040‑X) that requires the original W‑2 to be included, and you want to keep all documents together for a mailing to the IRS.

When You Should Avoid It

• Warning sign: You are using a prepaid envelope or a mailing service that restricts the number of staples, which could cause the envelope to jam or be rejected.
• Warning sign: Your state tax agency advises against staples on returns, or you are filing electronically, where a physical W‑2 is not needed.

Pros and Cons

Pros

• Helps keep the W‑2 physically attached to the tax return, reducing the chance it gets separated during mailing.
• Provides a clear, organized package for the IRS, which can simplify processing when the return is paper‑based.

Cons

• If the staple is too large or placed incorrectly, it can damage the paper or cause the envelope to be rejected, leading to filing delays.
• Many modern filing processes encourage electronic submission, making a physical staple unnecessary and potentially wasteful.

Decision Checklist

• Am I filing a paper return that specifically permits a staple according to the current IRS instructions?
• Will the mailing method I use accept stapled documents without issues?
• Do I have an electronic filing option that would eliminate the need for a physical W‑2 attachment?

Alternatives to Consider

If you have access to electronic filing, you can submit your W‑2 information directly through tax‑preparation software, which transmits the data securely to the IRS and removes the need for a physical document. For paper filers, you may instead use a paperclip or place the W‑2 in a sealed envelope inside the mailing package, following any agency‑specific guidance.

Final Recommendation

Stapling your W‑2 to a paper tax return is acceptable when the IRS instructions expressly allow it and when your mailing method can accommodate a staple without risk of rejection. In most cases, especially when electronic filing is available, using a digital submission or a non‑stapled method is simpler and less error‑prone. When in doubt, consult a tax professional or refer to the latest IRS filing instructions to avoid unnecessary delays.