Retirement does not simplify your taxes -- it rearranges them. The paycheck stops, but the tax obligations continue from multiple sources, each with different rules. The years between retirement and Required Minimum Distributions represent the single largest tax planning window most people will ever have. Missing it means paying hundreds of thousands more in taxes over a 25-30 year retirement than necessary.

The Critical Path

These steps are sequenced by when they matter most in the transition from working to retired. The early steps are time-sensitive and create the foundation for everything that follows.

Your Tax Action Plan for Retirement
1
Map all income sources and their tax treatment
First 60 days of retirement
Inventory every income stream and classify it by tax treatment: fully taxable (pension, traditional IRA/401(k) distributions, W-2 income), partially taxable (Social Security -- 0%, 50%, or 85% taxable depending on combined income), tax-free (Roth distributions, municipal bond interest), and preferentially taxed (qualified dividends, long-term capital gains at 0%, 15%, or 20%). This map is the foundation for every other decision. Without it, you are guessing.
2
Identify and quantify the gap years opportunity
Immediately after retirement
The years between retirement and when RMDs begin (age 73 or 75 depending on birth year) are your lowest-income years and represent a once-in-a-lifetime Roth conversion window. Calculate your projected taxable income for each gap year. Every dollar of traditional IRA or 401(k) money you convert to Roth during these years is taxed at today's lower rate instead of being forced out later at potentially higher rates when RMDs stack on top of Social Security and other income.
3
Set up estimated tax payments or voluntary withholding
Within 30 days of last paycheck
Without employer withholding, you are responsible for paying taxes quarterly. You can either file Form 1040-ES and make quarterly estimated payments, or request voluntary withholding from Social Security (Form W-4V, limited to 7%, 10%, 12%, or 22%) and IRA distributions (Form W-4R). The safe harbor requires paying at least 100% of prior-year tax (110% if AGI exceeds $150,000) or 90% of current-year tax to avoid underpayment penalties.
4
Execute Roth conversions during low-income years
Each year during gap years
Convert traditional IRA or 401(k) funds to Roth up to the top of your current tax bracket. For a married couple in 2026, you can fill the 12% bracket up to $100,800 of taxable income and the 22% bracket up to $211,400. If your other income is low during gap years, you may be able to convert $50,000-$100,000 per year at the 12% or 22% rate instead of paying 24%-32% on forced RMDs later. Run the projection before each conversion, because the optimal amount changes every year.
5
Understand RMD rules and plan your first distribution
By age 72 for planning, age 73 or 75 for first RMD
Required Minimum Distributions from traditional IRAs and employer plans begin at age 73 (born 1951-1959) or age 75 (born 1960 or later) under SECURE 2.0. Your first RMD can be delayed until April 1 of the year after you reach RMD age, but this forces two RMDs into one tax year -- nearly always a bad outcome. RMDs are calculated by dividing the December 31 account balance by the Uniform Lifetime Table factor. Roth IRAs have no lifetime RMDs. The penalty for missing an RMD is 25% of the amount not distributed, reduced to 10% if corrected within two years.
6
Manage IRMAA thresholds to avoid Medicare surcharges
Two years before Medicare enrollment and ongoing
Medicare Part B and Part D premiums include Income-Related Monthly Adjustment Amounts (IRMAA) based on your modified adjusted gross income from two years prior. For 2026, the first IRMAA cliff hits at $109,000 for single filers and $218,000 for married filing jointly, adding $67.90/month per person to Part B premiums. These are cliff thresholds, not gradual phase-ins -- one dollar over the threshold triggers the full surcharge. Every Roth conversion and every investment sale must be evaluated against the IRMAA brackets two years downstream.
7
Optimize Social Security claiming strategy
Starting at age 62, decision by age 70
The tax implications of Social Security are often more important than the benefit amount itself. Up to 85% of Social Security benefits become taxable when combined income (AGI + nontaxable interest + half of Social Security) exceeds $44,000 for joint filers. Delaying benefits from 62 to 70 increases the monthly amount by approximately 77%, but also affects your combined income calculation for every other year. The optimal claiming age depends on your other income sources, life expectancy, and the interaction with IRMAA thresholds.
8
Establish sustainable withdrawal sequencing
Before first year of full retirement
The order in which you draw from accounts matters as much as the total amount you withdraw. The general framework is: spend taxable accounts first (to minimize ongoing tax drag), then traditional tax-deferred accounts (to manage bracket exposure), and preserve Roth accounts for last (tax-free growth). However, this sequence should be adjusted annually based on bracket space, IRMAA projections, and Roth conversion opportunities. A static withdrawal plan almost always leaves money on the table.
## Key Deadlines

Missing these deadlines does not just create penalties -- it eliminates planning opportunities that cannot be recovered.

Critical Deadlines for Retirees
Q1, Q2, Q3, Q4
Estimated tax payments
Due April 15, June 15, September 15, January 15 -- underpayment penalties accrue per quarter
Dec 31
Annual Roth conversion deadline
Roth conversions must be completed by December 31 of the tax year -- no extensions
Age 73 or 75
First RMD due
April 1 of the year after reaching RMD age, but taking it in that year forces two RMDs into one tax year
Dec 31 each year
Subsequent RMDs
All RMDs after the first must be taken by December 31 -- no extensions
Age 65
Medicare enrollment
Initial enrollment window is 7 months around your 65th birthday -- IRMAA lookback uses income from 2 years prior
## Common Mistakes
Warning

Do not delay your first RMD to April 1 without calculating the tax impact of two RMDs in one year. If your annual RMD is $40,000, taking two in one year adds $80,000 of income to that year's return. This can push you into a higher bracket, trigger IRMAA surcharges two years later, and cause up to 85% of your Social Security to become taxable. In most cases, taking the first RMD in the year you turn 73 (or 75) produces a better outcome than deferring to April 1.

Warning

Do not ignore the IRMAA two-year lookback when planning Roth conversions. A large conversion in 2026 affects your Medicare premiums in 2028. If the conversion pushes your income above an IRMAA cliff, the Medicare surcharge can cost $800-$4,000 per person per year, significantly reducing the net benefit of the conversion.

Tip

The gap years between retirement and RMDs are the most valuable tax planning window in most people's financial lives. A couple retiring at 62 with RMDs starting at 75 has 13 years of potential Roth conversions at reduced rates. Converting $60,000 per year at the 12% bracket instead of paying 22%-24% on forced RMDs later saves $6,000-$7,200 per year in federal tax alone -- over $78,000-$93,600 across the gap years, plus decades of tax-free growth on the converted amounts.

## What Inaction Costs
Married couple, both age 63, $1.8M in traditional IRAs, $200K in Roth IRA, $300K in taxable accounts, $36K combined Social Security at full retirement age
Without Planning
No retirement tax planning -- just take money as needed
  • No Roth conversions during gap years -- all $1.8M subject to RMDs at potentially higher brackets
  • Social Security claimed at 62 without analyzing tax interaction -- 85% taxable from day one
  • No estimated payments set up -- $3,200 underpayment penalty in year one
  • First RMD deferred to April 1 -- two RMDs in one year push into 24% bracket and trigger IRMAA
  • Withdrawal sequence unplanned -- selling appreciated taxable investments first triggers unnecessary capital gains
Result$150,000-$250,000 in excess taxes over 25-year retirement
With Planning
CPA-guided retirement tax plan starting at age 63
  • Gap years identified -- $75,000/year Roth conversions at 12%-22% rate for 12 years before RMDs begin
  • Social Security optimized -- delayed to 70, coordinated with Roth conversions during low-income years
  • Estimated payments and voluntary withholding calibrated quarterly -- no penalties
  • IRMAA managed proactively -- conversions sized to stay below cliff thresholds
  • Withdrawal sequence adjusted annually based on bracket space and conversion opportunities
Result$100,000-$200,000 in tax savings over 25-year retirement
## Key Forms and References
IRS Publication 590-B
Distribution rules for traditional and Roth IRAs -- RMD tables, calculation methods, and beneficiary rules
Form 1040-ES
Estimated tax payment vouchers and worksheet -- required when you no longer have employer withholding
Form W-4V
Voluntary withholding request for Social Security benefits -- limited to 7%, 10%, 12%, or 22%
SECURE 2.0 Act
Changed RMD start ages to 73 (born 1951-1959) and 75 (born 1960+), reduced penalties, eliminated Roth 401(k) RMDs
IRC 408A
Roth IRA rules -- contribution limits, conversion mechanics, qualified distribution requirements
IRMAA Thresholds
Medicare premium surcharges based on income from two years prior -- cliff-based, not graduated
## Get Personalized Guidance

Retirement tax planning is not a one-time event -- it requires annual recalculation as tax law changes, your income shifts, and your account balances evolve. The difference between a static plan and an actively managed one compounds dramatically over a 25-30 year retirement.

Take the FindCPA assessment to get personalized interview questions tailored to your retirement situation, so you can find a CPA who specializes in withdrawal sequencing, Roth conversions, and IRMAA management.

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