Estimated Taxes in Early Retirement: Safe Harbors Explained

By Tom, CPA · Updated October 25, 2026

TL;DR: Without a paycheck, nobody withholds for you. If you expect to owe $1,000 or more, pay enough during the year to cover the smaller of 90% of this year's tax or 100% of last year's (110% if last year's AGI was over $150,000). 2026 due dates: April 15, June 15, Sept. 15 and Jan. 15, 2027.

Educational only, not tax, legal, or investment advice. Examples are illustrations, not predictions. Rules and limits change; verify current figures and talk to a qualified professional about your situation.

No paycheck means no withholding means the IRS wants a quarterly postcard with money in it. The U.S. tax system is pay-as-you-go. When you worked, your employer handled this. In early retirement, your income comes from dividends, capital gains, IRA withdrawals and Roth conversions, and none of those withhold automatically unless you ask.

The good news: the safe harbor rules make it easy to avoid penalties, even if you have no idea what your income will be. This guide covers the rules, the 2026 dates from Form 1040-ES and a few useful tricks.

CPA Warning Label: The penalty is calculated per quarter. Paying everything in January does not erase a penalty for skipping April, unless the money came in as withholding.

Why retirees owe estimates

You generally must make estimated payments if you expect to owe at least $1,000 for the year after subtracting withholding and refundable credits, and your withholding and credits will be less than the smaller of 90% of this year's tax or 100% of last year's tax (IRS Topic 306, Form 1040-ES). The prior-year test uses 110% if your prior-year AGI was more than $150,000 ($75,000 if married filing separately).

Early retirees trip over this in predictable ways:

• The first year of retirement, when last year's tax was high from wages, so the 100% safe harbor is a large number.
• Roth conversion years, where the conversion creates a lump of tax.
• Big capital gain years from rebalancing or harvesting into the 15% band.
• Years with ACA premium tax credit repayments.

Safe harbor rules (100%/110%)

You avoid the underpayment penalty if your total payments during the year, made on time, are at least the smaller of:

• 90% of the current year's tax, or
• 100% of the prior year's tax (110% if prior-year AGI exceeded $150,000, or $75,000 married filing separately). The prior year must have been a full 12-month year with a return filed.

The prior-year option is the easiest for retirees because you know the number already. If your 2025 total tax was $6,000, paying $1,500 each quarter in 2026 avoids any penalty, even if your 2026 tax turns out to be $20,000 because of a large conversion. You still owe the balance by April 15, 2027, but no penalty.

Retirees whose income dropped sharply may prefer the 90% current-year test, since last year's tax (with wages) could be much higher than this year's.

Quarterly due dates

The periods are not equal quarters, which is why the annualized method exists. Per Form 1040-ES, you do not have to make the January 15, 2027 payment if you file your 2026 return by February 1, 2027 and pay the entire balance with it.

Payments can be made through IRS Direct Pay, your IRS online account, EFTPS or by check with a 1040-ES voucher. Your state probably wants its own estimates on a similar schedule.

Withholding from IRAs trick

Here is the most useful rule in this guide: withholding is treated as paid evenly throughout the year, regardless of when it actually happened, unless you elect otherwise (IRS Publication 505). Estimated payments, by contrast, count on the date you make them.

That means a retiree who forgot all four estimated payments can request a large IRA distribution in December, have federal tax withheld from it, and the IRS treats that withholding as if one quarter of it arrived each quarter. The underpayment penalty can disappear.

Retirees over 59½ can simply take a distribution with heavy withholding. Younger retirees can use a variation that involves rolling the money back within 60 days; the details and risks are in IRA withholding to fix an underpayment.

You can also ask for withholding on Social Security benefits using Form W-4V and on pensions using Form W-4P, which turns lumpy estimates into steady withholding.

Annualized income method

If most of your income arrives late in the year, for example a December Roth conversion or capital gain, you can use the annualized income installment method on Form 2210, Schedule AI. It calculates the required payment for each period based on income actually received by the end of that period. A December conversion then only requires a larger fourth-quarter payment, not catch-up payments for the earlier quarters.

The catch is paperwork: you must attach Form 2210 with Schedule AI to your return. Software handles it, but you need to track when each item of income arrived.

Illustration: first year of retirement

Illustration. Assumptions: married couple, both retired in January 2026. 2025 AGI was $210,000 and total 2025 tax was $28,000. Expected 2026 income: $20,000 of dividends and interest plus a $100,000 Roth conversion in December. Expected 2026 federal tax: about $9,000.

• Prior-year safe harbor: 110% of $28,000 = $30,800 (because 2025 AGI exceeded $150,000). Far too high.
• Current-year safe harbor: 90% of $9,000 = $8,100. That is the smaller number.
• Option A: pay $2,025 each quarter based on the estimate.
• Option B: use the annualized method; with the conversion in December, most of the required payment falls in the fourth period.
• Option C: withhold $8,100 or more from a December IRA distribution or the conversion itself, treated as paid evenly.

Option C is simplest, but withholding from a conversion means less money ends up in the Roth, and if you are under 59½ the withheld amount may be subject to the 10% early distribution tax. Paying from a taxable account is usually better.

Estimates for Roth conversion years

Conversions are the most common cause of estimated tax surprises in early retirement. A $100,000 conversion at the top of the 12% bracket may add $11,000 or more of federal tax, plus state tax. Three ways to handle it:

• Convert in January and pay four equal estimates. Clean, but you are committing before you know the year's income.
• Convert in December and rely on the prior-year safe harbor. If last year's tax was small and you paid 100% of it (or 110%), you can owe a large balance in April with no penalty. This is the lazy, effective approach.
• Convert in December and pay the tax with the January 15 estimate, documenting the timing with the annualized method on Form 2210.

If your prior year included a large conversion, the prior-year safe harbor rises with it. A conversion-every-year strategy settles into a steady pattern: pay roughly last year's tax in four installments.

Penalty basics and waivers

The penalty is essentially interest on the amount underpaid for each period, at the IRS underpayment rate. It is figured on Form 2210. The IRS can waive it if the underpayment was due to casualty, disaster or other unusual circumstances, or if you retired after reaching age 62 or became disabled during the year or the prior year and the underpayment was due to reasonable cause, not willful neglect (IRS Topic 306). Note: early retirees in their 40s and 50s do not qualify for the retirement waiver.

State estimated taxes

Most states with an income tax have their own estimated payment requirements, safe harbors and penalties, often on the same dates as the federal ones. The rules are similar but not identical; some states use different percentages or due dates. If you move states during retirement, you may need estimates for both in the year of the move. See changing state residency.

A simple system

1. In January, look up last year's total tax (line 24 of Form 1040).
2. Multiply by 100% or 110% and divide by four. That is your no-thinking quarterly payment.
3. If your income dropped a lot, estimate this year's tax and use 90% instead.
4. Calendar the four dates.
5. In December, check year-to-date and top up with IRA withholding if needed.

Frugal Fran automated it: a scheduled IRS Direct Pay payment four times a year. Lavish Larry prefers a surprise every April. The IRS prefers Fran.