{
  "id": 4453696,
  "title": "The Roth Conversion Deadline Is Dec. 31, but the Tax Bill Comes Due Jan. 15. Retirees Who Don’t Prepay Get Hit With a Penalty on Top.",
  "url": "https://urgent.news/2026/08/30/the-roth-conversion-deadline-is-dec-31-but-the-tax-bill-comes-due-jan",
  "topic": "finance",
  "section": "Finance & Markets",
  "published": "2026-08-30T15:42:36.000Z",
  "source": {
    "name": "Yahoo Finance",
    "slug": "yahoo-finance",
    "url": "https://finance.yahoo.com/markets/currencies/articles/roth-conversion-deadline-dec-31-154236194.html"
  },
  "original_language": "en",
  "account": "A Roth conversion completed on December 31 triggers a tax bill due on January 15, and failing to make quarterly estimated payments incurs penalties. Retirees with prior-year AGI above $150,000 must prepay 110% of last year's tax to avoid underpayment penalties. Requesting IRA withholding in November or December retroactively applies payments to all four quarters, fixing earlier shortfalls that a January estimated payment cannot. Estimated tax is the pay-as-you-go system for income without automatic withholding. Retirees running Roth conversions often overlook this because the income is bunched into a single event, with the final installment due on January 15, and underpayment penalties accrue by quarter rather than as a single charge at filing. Safe harbor refers to IRS thresholds that protect taxpayers from underpayment penalties. To qualify, they must pay at least 90% of what they owe for the current year or 100% of what they owed last year, whichever is smaller. If AGI was over $150,000 in the prior year, that threshold increases to 110%. If a retiree exceeds the AGI threshold, the safe harbor calculation remains the same, tied to last year's return. Underpayment penalties are calculated like interest, charging the federal short-term rate plus 3 percentage points, currently above the zero-rate years. Payments are credited to the quarter in which they are made, while withheld federal income tax is generally treated as paid evenly across four quarters. A retiree converting in November or December can cure underpayment by requesting withholding from a retirement account distribution in the same month, retroactively fixing earlier quarters. Alternatively, the annualized income installment method on Form 2210 can reduce or eliminate the penalty by showing income arrived unevenly throughout the year. However, this method is more complex. The IRS permits a penalty waiver for certain circumstances, such as retirees reaching age 62 or becoming disabled due to reasonable cause. State estimated taxes operate on their own schedule, potentially adding additional penalties for retirees focused solely on federal requirements. Finally, paying the conversion tax out of the converted amount itself permanently reduces the Roth balance and imposes a 10% additional tax on early distributions for those under 59½. A CPA or enrolled agent can help model numbers, arrange withholding, and file Form 2210 correctly, preventing the penalty cost.",
  "summary": null,
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}