Preparing your tax documents each year can feel routine, but even one missing form can slow down the entire process.
Incomplete information often leads to filing delays, refund hold-ups, or follow-up questions from the IRS after the return is filed.
Before sending your documents to your CPA, review this list of commonly overlooked items that continue to cause issues for taxpayers in 2026.
Income forms are still the most frequent cause of filing delays. This includes W-2s, 1099-NECs, 1099-INTs, 1099-DIVs, and forms from side work, bonuses, or investment accounts.
Using last year’s tax return as a checklist is one of the easiest ways to confirm nothing is missing. The IRS receives copies of these forms, so unreported income is typically identified through matching programs.
If you own an interest in a partnership, LLC, or S corporation, your Schedule K-1 is required before your return can be filed. These forms often arrive later than other tax documents and are a common reason returns remain on hold well into March or April.
Selling investments or real estate requires more than just reporting proceeds. Purchase dates, original cost, and adjustment information are needed to calculate taxable gains correctly. Broker statements do not always include complete basis data, so reviewing transaction details carefully is critical.
Adding a dependent requires a name, Social Security number, and date of birth. Conflicts arise when multiple taxpayers attempt to claim the same dependent.
If a child or other dependent is shared between households, the decision on who will claim them should be settled before filing. Returns with unresolved conflicts cannot be e-filed.
A missing or incorrect Social Security number will immediately stop electronic filing. Name mismatches are also common after marriage or divorce. Your tax return must match the name on file with the Social Security Administration, regardless of how you file other documents.
Not all reported income is taxable. For example, retirement distributions shown on Form 1099-R may be part of a qualified rollover. Providing context allows your CPA to report the transaction correctly and avoid unnecessary tax.
If you claim deductions or credits, documentation is required. This includes charitable contributions, education expenses, and certain business-related items. Without support, deductions may need to be reduced or removed, which can change the outcome of your return.
For 2026, accurate reporting of tips and overtime remains important. Employees should confirm that all tip income is properly reported by their employer and reflected on Form W-2. Employers and business owners should also ensure payroll systems are treating this income correctly. Inconsistent reporting can trigger IRS questions later.
If you purchased health insurance through the Health Insurance Marketplace, Form 1095-A is still required to complete your return and reconcile any Premium Tax Credit.
This form impacts fewer taxpayers today, but when applicable, it is essential for filing accurately.
Even when everything else is complete, your return cannot be filed until all required authorization forms (Form 8879) are reviewed and signed. Prompt approval helps avoid last-minute delays as filing deadlines approach.
Missing documents do not eliminate your responsibility to report income. If a form never arrives or arrives with errors, the correct information must still be reported.
To reduce issues:
Providing a complete and accurate set of documents allows your CPA to file your return more efficiently, reduce the risk of IRS notices, avoid amended returns, and identify planning opportunities that might otherwise be missed. Incomplete information often leads to delays, corrections, and unnecessary stress after filing.
To make preparation easier, download Alloy Silverstein’s Individual Tax Return Checklist at alloysilverstein.com/tax-season. It is designed to help ensure nothing is overlooked before your documents are submitted.
A little preparation upfront can make tax season smoother and far less stressful.
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