What Happens If You Miss a Quarterly Estimated Tax Payment

By Tallyvane, independent developer and publisher · Tax year 2026 · Published September 8, 2026 · Written from the documents listed at the end; not tax advice.

Missing an estimated payment is not a filing failure and does not carry the late-filing or late-payment penalties that apply to a return. It carries a charge that the Code calls an "addition to tax" and that behaves like interest: a percentage rate applied to the amount that was short, for the number of days it was short. The rate is modest, the clock stops the day you pay, and there is no amount of lateness that turns it into something worse. What follows is the arithmetic, what a typical miss costs, and the situations in which the charge is cancelled.

How the penalty is computed

Section 6654 compares what had been paid in by each due date with the "required installment" — one-quarter of the required annual payment, which is the smaller of 90% of this year's tax and 100% (or 110%) of last year's. For each installment that was short, the charge is:

underpayment × annual rate × (days late ÷ 365)

Three details in the statute decide the number of days.

• The period runs from the installment's due date to the earlier of the day the shortfall is paid and the return's original due date — April 15 of the following year (§6654(b)(2)). Interest on an unpaid balance after April 15 is a different charge, under §6601, and continues until paid.
• Payments are credited to the oldest unpaid installment first (§6654(b)(3)). A late second payment that arrives with the third is applied to the second installment, and the third then becomes short until the next payment.
• The rate changes each quarter. It is the federal short-term rate plus three percentage points, rounded to a whole percent (§6621(a)(2)), announced by the IRS about six weeks before each quarter. Where a shortfall spans two quarters, each quarter's days are charged at that quarter's rate.

The computation is done on Form 2210, Underpayment of Estimated Tax by Individuals, Estates, and Trusts, and the result goes on the estimated tax penalty line of Form 1040. Filing Form 2210 is optional in the ordinary case: if it is left off, the IRS computes the penalty from the return and the payment record and sends a bill. The form has to be filed when a waiver is requested, when the annualized income method is used, or when withholding is to be counted on the dates it was actually withheld rather than evenly.

What a missed payment costs

A single filer with $80,000 of net profit and no prior-year figure has $16,647 of 2026 federal tax (self-employment tax plus income tax) and a required installment of $3,746 under the 90% test. Suppose the second installment, due June 15, 2026, is missed and paid later.

A month's delay costs about $20.01; carrying the shortfall all the way to the return costs $216.84. If nothing is paid during the year at all, each of the four installments accrues from its own due date to April 15, and the four charges add up to $688.18 on $16,647 of tax — a little under 4% of the bill. That is the entire cost of the omission, provided the return is filed and the balance paid on time in April.

The figures scale with the shortfall. A filer whose required installment is twice as large pays twice the penalty; one who paid half the installment on time is charged only on the missing half. Paying the missed amount as soon as it is noticed, rather than waiting for the next due date, is the one thing that reduces the charge.

When there is no penalty

The statute cancels the charge in four situations.

• Tax after withholding under $1,000. If the return's tax, less withholding, is under $1,000, no estimated payments were required and nothing is charged (§6654(e)(1)).
• No tax last year. No penalty if the prior year was a full twelve-month year with zero tax liability and you were a U.S. citizen or resident throughout it (§6654(e)(2)).
• Casualty, disaster or unusual circumstances. The IRS may waive the charge where imposing it "would be against equity and good conscience" (§6654(e)(3)(A)). This is requested on Form 2210, Part II, with an explanation. Federally declared disasters usually come with an automatic postponement of the due dates instead.
• Retirement or disability. A filer who retired after reaching age 62, or became disabled, in the year of the underpayment or the year before, and whose underpayment was due to reasonable cause rather than willful neglect, can ask for a waiver (§6654(e)(3)(B)).

A fifth route is not an exception but a recomputation. If income arrived unevenly — most of it late in the year — the annualized income installment method (§6654(d)(2), Schedule AI of Form 2210) sets each installment from the income actually received by the end of its period, annualized. A filer who earned little before June and a lot after can eliminate the penalty on the early installments that way, at the cost of a longer form.

Withholding can cure an earlier miss

Tax withheld from wages is treated as paid in four equal parts on the four due dates, whenever it was actually withheld (§6654(g)). A filer with a job who missed the April and June installments can increase withholding for the rest of the year; the extra is deemed to have been paid from April, and the penalty on the missed installments disappears to the extent the total withholding covers them. Estimated payments do not get this treatment — a late estimated payment is late. The details are in the guide on using W-2 withholding to cover 1099 tax.

What to do after a missed payment

1. Pay the missed installment now, through the IRS Online Account or Direct Pay, designated as a 2026 estimated payment. The charge stops accruing on the day of payment.
2. Make the remaining installments on time. Each one is judged separately, so one miss does not compromise the others.
3. Check the required annual payment. If last year's tax was smaller than this year's, the 100%-of-prior-year test may set a lower installment than the one that was missed, which shrinks the shortfall and the charge. The quarterly calculator does this comparison.
4. At filing time, either let the IRS compute the penalty and bill it, or complete Form 2210 and enter the amount on Form 1040 — the latter if a waiver, the annualized method, or actual withholding dates apply.

The penalty is not deductible, and it is not reduced by an extension to file. An extension postpones the return, not the payment; the April 15 end date in §6654(b)(2) does not move.

Documents this guide was written from

• 26 U.S.C. §6654 — the addition to tax for underpaying estimated tax: the period of underpayment (b)(2), order of crediting (b)(3), exceptions (e), withholding (g)
• 26 U.S.C. §6621 — the underpayment rate: federal short-term rate plus three percentage points, set each quarter
• IRS quarterly interest rates — the 2026 rates by quarter used in the tables
• IRS Form 1040-ES (2026) — the general rule and the reference to Form 2210

Figures in the tables are computed by the same engine as the site's calculators from its 2026 data files; the methodology page lists the rules and their verification status, and the editorial policy says how sources are chosen. Tallyvane is not a CPA, enrolled agent or attorney.

Related

• Estimated tax penalty calculator
• Quarterly estimated tax calculator
• 2026 due dates and the safe harbor rule
• Using W-2 withholding to cover 1099 tax