Reconcile missing forms, sale proceeds, basis and senior-deduction eligibility. Resolve filing questions separately from planning decisions for the new year.

March 9, 2026 · Financial Forte Staff

Historical article: prepared retrospectively using information available as of March 9, 2026.

By the middle of tax season, the temptation is to finish the return and move on. A few unresolved details can seem minor beside a nearly complete draft. Those details may be exactly where an incorrect basis, missing form or misunderstood deduction changes the result.

Before pressing submit, reconcile the return with the transactions that actually occurred. Then separate filing corrections from decisions for the new year. A careful review does not require reopening every financial choice; it requires knowing which figures are supported and which still depend on an assumption.

Match expected documents with received documents

Make a list of the accounts and income sources active during 2025. Compare it with the W-2s, 1099s, K-1s and other records received. Closing an account or changing custodians during the year does not necessarily eliminate the need for a tax statement from the former provider.

Look for corrected documents and confirm whether any are still expected, with an agreed follow-up date for unresolved statements. If an account generated transactions but no form has arrived, ask the provider or preparer what records are needed. The absence of a form does not by itself establish that an item is not reportable. [1]

Retirement distributions deserve particular attention. A rollover, Roth conversion and ordinary cash withdrawal can have different treatment even when they all involve money leaving an account. Provide the transaction records and any relevant basis history rather than relying on the gross distribution amount alone. [2]

Also reconcile estimated payments and withholding with the return. A correct income figure paired with a missing payment can produce a misleading balance due. Confirm payments by tax year, especially when a payment made early in 2026 was designated for 2025.

Do not confuse sale proceeds with taxable gain

Arthur is a hypothetical investor who sold shares during 2025 for $50,000. His records support an adjusted tax basis of $35,000. Assume there are no selling-cost adjustments or other complications. The gain is $15,000, not the entire $50,000 received. [3]

Suppose the tax statement leaves basis blank because the broker does not report it for those shares. Arthur should not assume the basis is zero, and he should not invent a figure from memory. He needs records that support the appropriate amount, including relevant adjustments.

If a simplified calculation mistakenly taxed $50,000 instead of $15,000 at an assumed 15% long-term capital-gains rate, the difference would be $5,250: $35,000 of overstated gain multiplied by the illustrative 15% rate. That illustration isolates the basis error; Arthur's actual rate, other gains and losses, deductions and possible additional taxes must be evaluated separately.

Reinvested dividends, corporate actions, inherited property and gifts can complicate basis. The right figure is not always the amount visible on the first purchase confirmation. Ask the preparer which records are needed and retain the resulting calculation and its supporting records for future transactions. [3]

The same discipline applies to nondeductible traditional IRA contributions. Basis tracked for IRA purposes follows different rules from brokerage cost basis and may require Form 8606. Do not treat every dollar withdrawn from every IRA as automatically taxable or automatically tax-free. [2]

Check the new senior deduction against actual facts

For 2025, the enhanced deduction for eligible seniors is separate from the existing additional standard deduction for age. It can be available whether the taxpayer itemizes or uses the standard deduction, but the age, identification, filing-status and income requirements still apply. Married taxpayers must file jointly to claim it. [1][4]

For a simple hypothetical, assume a qualifying single taxpayer has modified adjusted gross income of $90,000 for this provision. That is $15,000 above the $75,000 phaseout starting point. A 6% reduction on that excess is $900, leaving a $5,100 deduction from the $6,000 maximum. [4]

The $5,100 is a deduction, not a credit or promised refund. It also does not mean Social Security benefits disappear from the income calculation. The return should apply the appropriate Social Security reporting rules and then calculate the deduction in its proper place. [1]

A person's birthday and marital status should not be inferred from last year's filing or a casual description such as “retired.” Eligibility depends on the specific rules and facts. Have the preparer confirm them before accepting a prefilled amount.

Close the open items before filing

Ask for a short explanation of any material change from the prior return: higher tax, lower withholding, a new deduction or a different amount of taxable retirement income. A change can be correct and still deserve a clear explanation.

If information is missing, determine whether an extension is appropriate and how to estimate the payment due. An extension to file generally does not extend the time to pay. The general 2025 federal individual deadline is April 15, 2026, subject to applicable exceptions or relief. [1]

Keep a separate planning list for 2026 withholding, contribution elections and potential investment transactions. Do not let a future planning idea delay a filing correction that can be completed now.

The final review should produce a return supported by records, a clear payment or refund expectation and a list of documents to retain. That is a more useful finish line than simply seeing the filing software report that every box has been completed.

Related reading

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Educational information, not personalized investment, tax, legal or benefits advice. Examples use hypothetical assumptions. Verify current rules and your circumstances before acting.

Sources

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