Sometimes, for the federal estimated-tax calculation. Under the IRS’s 2026 annualized estimated-tax worksheet, withholding is generally allocated across payment periods—evenly by default—although the worksheet also permits using the dates the tax was actually withheld. That can let withholding from a December IRA distribution count in the calculation for earlier periods. It does not mean every December withholding is automatically treated as paid in January, erase an earlier shortfall, or guarantee there will be no penalty.
How the IRS allocates withholding across estimated-tax periods
For the annualized estimated-tax worksheet, the IRS’s default is to treat one-fourth of estimated withholding as withheld on the due date of each payment period. The cumulative allocation is 25% for the first period, 50% for the second, 75% for the third, and 100% for the fourth. The worksheet also allows a taxpayer using this method to report withholding according to its actual dates. See the IRS’s 2026 Publication 505.
This is an allocation convention for calculating estimated-tax installments, not a change to the date the IRA distribution occurred. It is not an unconditional rule that all withholding is deemed paid on January 1 in every tax calculation.
What the May-and-December example does—and does not—show
Suppose someone takes $60,000 from an IRA in May, makes no estimated payments, then takes another $20,000 in December and has all of that second distribution withheld for federal income tax. Under the worksheet’s default allocation, withholding may be spread across the payment periods for the annualized calculation. The worksheet’s actual-date option is another approach.
Those facts alone are not enough to determine whether the person owes an estimated-tax penalty. That requires the relevant tax figures and circumstances, including taxable income from the distributions, total tax, withholding, prior-year tax, filing status, and any applicable special rules. A late-year distribution does not automatically cure an earlier installment shortfall.
Installment dates and the safe-harbor test
For calendar-year individuals, the general estimated-tax periods in 2026 end March 31, May 31, August 31, and December 31. Their general due dates are April 15, June 15, September 15, and January 15 of the following year. Weekend, holiday, and special taxpayer rules can change dates; the IRS also describes an exception related to filing and paying by the January installment deadline. Consult Publication 505 and the IRS’s underpayment penalty guidance for the applicable year.
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For most taxpayers, the 2026 general required annual payment is based on the smaller of 90% of expected 2026 tax or 100% of tax shown on the 2025 return, provided that return covered 12 months. For certain higher-income taxpayers, the prior-year comparison is generally 110% instead of 100%. In general, estimated payments may be required when the taxpayer expects to owe at least $1,000 after withholding and refundable credits and does not meet the applicable payment threshold. Farming and fishing, filing status, the length of the prior-year return, and other facts can alter the rules.
Meeting a safe harbor and meeting each installment deadline are related but distinct questions. The IRS warns that a penalty can apply when enough tax was not paid by a period’s due date, even if the taxpayer receives a refund when filing the return.
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When annualizing income may help
The annualized income installment method can be relevant when income is uneven during the year. Instead of assuming income was earned evenly, it calculates estimated-tax liability as income accumulates. A taxpayer considering it should follow the worksheet instructions and use the income and payment information required for each period; the existence of a large December withholding amount by itself does not establish the result.
IRA withholding is not the same as the IRA’s final tax
Federal income tax is generally withheld from IRA distributions unless the recipient elects out. If withholding is insufficient, estimated tax may be needed. But the amount withheld is not necessarily the distribution’s final tax liability. Whether a distribution is taxable depends on facts not provided here, such as whether the account is traditional or Roth, any after-tax basis, the recipient’s age, distribution eligibility, other income, and deductions or credits. The IRS discusses these issues in Topic No. 557.
If a distribution is early, a separate 10% additional tax may apply unless an exception fits the circumstances. The IRS lists exceptions that include disability and certain medical or education costs, as well as qualified first-time home purchases and other specified situations. This additional tax is distinct from an estimated-tax underpayment penalty; whether an exception applies is fact-dependent.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Federal rules are not necessarily state rules
This explanation concerns U.S. federal estimated-tax calculations under the IRS’s 2026 guidance. State income-tax withholding and estimated-payment rules may use different timing and allocation rules, so check the relevant state tax agency’s guidance separately.
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