IRC 6501 assessment: compute the 3-year deadline

Answer B. The general rule is that the IRS has three years from the date a return is filed to assess additional tax. A major exception is a return filed fraudulently with intent to evade tax, in fraud cases the limitation period does not bar assessment. Therefore choice B is correct.

Why not A: This is a classic threshold-misread trap. A substantial omission of gross income can extend the assessment period, but the usual statutory threshold is greater (commonly cited as more than 25% of gross income), so an omission of 20% would not generally allow assessment after more than three years.

Why not C: Mathematical or clerical errors may be corrected under IRS procedures, but a math mistake by itself does not create an unlimited assessment period; unless another exception applies, the three-year statute governs.

Why not D: Overstated deductions can create an understatement of tax, but absent fraud or a specific statutory exception (such as a large omission of gross income), the normal three-year limitation on assessment applies.

Answer B. Form 4868 grants an automatic extension of time to file an individual return, not an extension of time to pay tax. Any tax not paid by the original due date generally accrues interest and may be subject to the failure-to-pay penalty even if the return is filed by the extended deadline.

Why not A: This is a common misconception: Form 4868 extends only the filing deadline. It does not extend the deadline to pay tax, so unpaid tax remains subject to interest and penalties from the original due date.

Why not C: A timely extension prevents the failure-to-file penalty if the return is filed by the extended date, but it does not stop interest from accruing on unpaid tax or necessarily eliminate the failure-to-pay penalty for amounts unpaid by the original due date.

Why not D: Form 4868 generally provides an automatic extension when properly and timely filed; separate IRS approval is not required for that automatic extension (though special relief or other requests could require IRS action).

Answer C. The normal 3-year assessment period is measured from the filing date of the original return; when an original return is filed before its due date it is treated as filed on the due date. Here the March 10, Year 2 original return is treated as filed on April 15, Year 2, so the three-year period runs to April 15, Year 5. The amended return filed in Year 3 does not restart the normal 3-year period for unrelated issues, so the IRS's September 20, Year 5 proposed assessment falls after the normal period has expired.

Why not A: This is tempting because an amended return is a later filing, but filing an amended return does not generally restart the normal 3-year assessment statute for unrelated items; the controlling start date remains the original return's filing date (subject to the early-filing rule).

Why not B: This distractor confuses the timing of IRS action with the statutory limitations period. The limitations period is measured from the taxpayer's filing date (treated as the due date if filed early), not from when the IRS first proposes an adjustment.

Why not D: Payment dates matter in some contexts (for example, refund claims), but voluntary payment on an amended return does not create a new 3-year assessment period for all items of that tax year; the period is tied to the original filing date unless another statutory exception applies.

Answer C. The general statute of limitations to assess additional tax is three years from the date the return is filed. For statute-of-limitations purposes, a return filed before its original due date is treated as filed on that due date. Because Jordan filed before April 15, Year 2, the return is treated as filed on April 15, Year 2, so the IRS generally has until April 15, Year 5 to assess.

Why not A: This applies the 3-year rule to the actual filing date; however, early-filed returns are treated as filed on the due date when computing the assessment period, so the assessment period runs from April 15, Year 2, not April 10.

Why not B: This reflects thinking the period is measured from the end of the tax year; the assessment period is generally measured from the filing date (or the due date if filed early), not from December 31.

Why not D: April 15, Year 8 suggests the 6-year rule, which applies when there is a substantial omission of gross income (more than 25%). The facts rule that possibility out, so the normal 3-year period applies.

Answer C. The general limitations period for assessment is three years from the date the return is filed, but a return filed before the prescribed due date is treated as filed on that due date. A valid automatic extension moves the prescribed due date to the extended date. Allen's September 10, 20X6 filing is therefore treated as filed on October 15, 20X6, so the IRS has until October 15, 20X9; Baker's March 20, 20X6 filing is treated as filed on April 15, 20X6, so the IRS has until April 15, 20X9. The six-year omission rule and fraud exceptions do not apply here because the facts negate those triggers.

Why not A: Tempting because it simply counts three years from the actual filing dates. It's wrong because returns filed before the prescribed due date are treated as filed on that due date (including when a valid extension exists), so the limitations periods start on the prescribed due dates, not the early filing dates.

Why not B: Tempting if one assumes every return is treated as filed on the regular April 15 due date and overlooks Allen's extension. It's wrong because Allen obtained a valid extension that moved his prescribed filing date to October 15, 20X6, so his three-year period ends October 15, 20X9.

Why not D: Tempting if a candidate misapplies the six-year omission rule (for omitted gross income >25%) as the default limitations period. It's wrong because the facts state neither taxpayer omitted more than 25% of gross income and neither return was fraudulent, so the three-year rule, not the six-year exception, controls.

Answer B. Under I.R.C. §6501 the general limitations period is three years measured from the date the return is filed. A return filed before its due date is treated as filed on the due date, while a late-filed return begins the 3-year period on the actual filing date. Cruz filed late on July 10, 20X2, so the 3-year period runs through July 10, 20X5 and therefore remains open on June 20, 20X5.

Why not A: Tempting because the later amended return might suggest the limitations period was restarted. However, Allen's original return was filed before the due date and is treated as filed on April 15, 20X2; an amended return does not generally restart the general 3-year assessment period absent a consent or specific statutory provision, so the period expired April 15, 20X5.

Why not C: Tempting because an IRS examination notice implies ongoing IRS action and might be read as keeping the case open. But an examination notice by itself does not extend or revive the general 3-year limitations period under §6501; Baker's timely return (treated as filed April 15, 20X2) therefore became time-barred on April 15, 20X5 and was closed by June 20, 20X5 absent consent or an exception.

Why not D: Tempting because Dunn's actual filing date is earlier in the year and could be misread as affecting the period. However, a return filed before the due date is treated as filed on the due date; Dunn's March 20, 20X2 filing is treated as April 15, 20X2, so the 3-year period expired April 15, 20X5.

Answer B. Because the return was filed after its original due date, the ordinary three‑year assessment period is measured from the actual filing date (June 10, Year 2) and therefore continues through June 10, Year 5. On May 20, Year 5 the normal limitations period was still open. Special rules (fraud, a written consent to extend, or a substantial omission of income) can lengthen the period, but nothing in the facts establishes any such exception.

Why not A: Tempting because many students recall the due date as the statute's anchor for timely-filed returns. It fails here because when a return is filed after the due date, the three‑year clock runs from the filing date, not from the original due date.

Why not C: This distractor lures candidates with the familiar six‑year rule for substantial omissions (>25% of gross income). It is incorrect because a substantial-omission finding would extend the limitations period further, not serve as a precondition for the normal three‑year period to be open, the three‑year period from the filing date applies unless a qualifying exception is shown.

Why not D: This is tempting because candidates often conflate audit activity or consent with tolling the statute. It fails because merely beginning an examination does not extend the statutory limitations period; only a valid written consent or another statutory exception will extend the assessment period.