Your First Year of Early Retirement: Month-by-Month Action Plan and Year 1 MAGI Calculator

The FIRE spreadsheets that calculated your path to financial independence modeled decades of growth with clean compound-interest math. Your first year of actually being retired is the opposite: a dense cluster of irreversible decisions and narrow windows that arrive simultaneously, all of which interact with each other.

Miss the 60-day COBRA election window and you permanently lose access to your employer's plan. Fail to model your Year 1 MAGI and the partial-year W-2 from your last months of work can push you over the ACA subsidy cliff — costing $10,000–$20,000 in lost premium tax credits at filing. Start Roth conversions in Year 2 instead of Year 1 and you permanently lose a year of the 5-year conversion clock. Begin draws from the wrong account first and you lock in a higher tax rate for a decade. Every one of these mistakes is common, expensive, and avoidable.

This guide walks through every decision, deadline, and trap in the order you'll face it — from your last weeks of employment through December 31 of your first retirement year.

Year 1 FIRE Planning Calculator

Enter your retirement details. The calculator estimates your Year 1 MAGI (the number that determines ACA subsidies and IRMAA exposure), key deadlines, and your Roth conversion opportunity.

Before Day 1: Last 60 Days of Employment

The month before you retire is a planning sprint, not a victory lap. Several decisions made here cannot be undone.

Maximize final 401(k) contributions

If you retire mid-year, you may have unused 401(k) contribution space from the months you worked. The 2026 deferral limit is $24,500 (or $32,500 at age 50+; $35,750 at ages 60–63).¹ You can often catch up on contributions in final paychecks — ask HR to bump the deferral percentage for your last one or two paychecks. Pre-tax contributions reduce Year 1 MAGI dollar-for-dollar, which can help preserve ACA subsidies.

Identify which 401(k) strategy applies — and don't accidentally destroy it

If you're 55 or older at separation, the Rule of 55 may give you penalty-free 401(k) access without a fixed schedule. The fatal mistake: rolling that 401(k) to an IRA before you understand whether the Rule of 55 applies to your plan. Rolling it permanently destroys the exception. If Rule of 55 doesn't apply (you're under 55), the 72(t) SEPP is your only way to access IRA funds on a fixed schedule before 59½ — start the Roth conversion ladder in parallel so you have flexibility.

Understand the IRMAA lookback starting now

Your Medicare Part B and D premiums starting at age 65 are based on your income from 2 years prior. If you're retiring at 63 or 64, your last year of employment income directly determines your first year of Medicare costs. The 2026 IRMAA tier-1 surcharge kicks in at $109,000 MAGI (single).⁴ A high final year of salary may mean elevated Medicare premiums at 65 — this is unavoidable, but knowing it exists prevents surprises.

Model Year 1 MAGI before you give notice

Use the calculator above. The core trap: if you retire in June with a $150,000 salary, your Year 1 W-2 income is already ~$75,000 — above the $63,840 ACA cliff for a single filer. If you also draw $30,000 from a traditional IRA, MAGI hits $105,000. There is no ACA subsidy at that level, and you're approaching IRMAA territory. The Year 1 MAGI problem almost always comes from partial-year salary, not portfolio draws.

Month 1: Healthcare First

Your employer coverage typically ends on your last day of work (or the last day of the month — check your HR plan documents). You have a 60-day Special Enrollment Period from that date to enroll in an ACA marketplace plan. You also have a 60-day window to elect COBRA. Both windows run concurrently — and you can only use one.

COBRA vs ACA: the core decision

If your Year 1 MAGI is above the ACA cliff due to partial-year salary, COBRA often makes more sense for the first 6–12 months — then switch to ACA marketplace for Year 2 when your MAGI is entirely retirement income (and you can engineer it below the cliff). See the Healthcare Before 65 guide for cost examples.

Months 1–3: Financial Infrastructure

Establish Bucket 1

Before making a single portfolio draw, establish your cash/short-term buffer. For early retirees with 35–50 year horizons, Bucket 1 should cover 1–3 years of spending in cash or money market. This insulates you from being forced to sell equities during a drawdown in Year 1 — the highest-risk sequence-of-returns period. If you retired with a severance payment or end-of-year bonus, this is the natural source. See the 3-bucket strategy guide.

Set up estimated tax payments

When you stop having W-2 withholding, you owe estimated taxes quarterly. The IRS safe harbor rules mean you avoid underpayment penalties if you pay the lesser of: (a) 90% of your current-year tax liability, or (b) 100% of your prior-year tax (110% if prior-year AGI exceeded $150,000).⁵ In Year 1, your prior-year tax was likely high (you worked the full prior year). The safe harbor may mean you owe nothing additional in estimated payments — but you'll still owe a large balance at filing. Set aside 20–30% of any taxable draws for this.

Quarterly estimated tax deadlines: Q1 April 15 · Q2 June 15 · Q3 September 15 · Q4 January 15 (of next year).

Update all beneficiary designations

Retirement accounts (IRA, 401k, 403b, 457b) pass outside of your will — they go to the named beneficiary on file. If your employer-plan beneficiary was a spouse or parent and circumstances have changed, update immediately. For early retirees with significant pre-tax IRA balances, the SECURE 2.0 10-year rule (T.D. 10001, July 2024) now requires annual RMDs for non-spouse beneficiaries when the decedent was past the RBD — make sure your designated beneficiary understands this.

Start Roth conversions in Year 1

Every Roth conversion starts a 5-year clock on January 1 of the conversion year (per IRC § 408A). A conversion you make in December 2026 becomes penalty-free to withdraw on January 1, 2031 — the same as a conversion made in January 2026. But a conversion made in January 2027 is not available until January 1, 2032. Each year of delay is a year of the pre-59½ access ladder that never exists. Use the Roth conversion ladder calculator to size your Year 1 conversion.

In Year 1, your ACA MAGI may be high due to partial-year salary. Run the calculator above first. If you're already above the ACA cliff, an additional $30,000–$50,000 in Roth conversions at the 22% or 24% rate may still make sense — you're converting at today's known rate against decades of tax-free growth. If you're below the cliff, stay below it; a conversion that pushes you over costs thousands in lost subsidies per year.

Year 1 Tax Planning: Four Moving Parts

Early retirement taxes in Year 1 have four coordination constraints that interact with each other:

1. The 12%/22% bracket boundary. In 2026, ordinary income above $66,500 AGI (single) or $133,000 (MFJ) enters the 22% bracket. Traditional IRA draws and Roth conversions count as ordinary income. If your W-2 already fills the 12% bracket, additional conversions cost 22%.²
2. The 0% LTCG window. Qualified dividends and long-term capital gains on taxable income below $49,450 (single)/$98,900 (MFJ) are taxed at 0% federal.³ This window is open to FIRE retirees with modest ordinary income. In Year 1, partial-year W-2 income may close it entirely — another reason to minimize traditional draws in Year 1 and wait until Year 2 when your income structure resets.
3. The ACA cliff ($63,840 single, 2026). MAGI above this level eliminates premium tax credits entirely. LTCG and qualified dividends count toward ACA MAGI even when taxed at 0% federal rate. Roth contribution withdrawals do not count.
4. The IRMAA 2-year lookback. Year 1 income (and Year 2) determine your Medicare Part B and D costs starting at 65. For early retirees far from Medicare, this is less urgent — but for retirees at 60–64, Year 1 income management is also IRMAA management.

See the complete early retirement taxes guide and tax-efficient withdrawal order for the full framework.

Year 1 Sequence-of-Returns Risk: The Most Dangerous Window

The first 5–10 years of retirement are the most dangerous for portfolio longevity. A 20% market decline in Year 1 of a 30-year retirement reduces your ending balance far more than the same decline in Year 25 — because you're selling shares at depressed prices before they recover, and those shares can never grow back for you.

Three mitigations that matter most in Year 1:

1. Spend from Bucket 1, not equities. If you have 1–3 years of cash/short bonds, you can avoid selling equities in a down market for years 1–3. Don't skip this step because markets are at all-time highs when you retire — that's exactly when the risk is highest.
2. Don't overconvert in Year 1 if markets are down. Roth conversions use portfolio dollars to pay taxes — in a down market, converting $50,000 at a depressed asset value has a higher opportunity cost than converting the same amount at peak valuation. Some advisors recommend lighter conversions in Year 1 bear markets and heavier conversions in recovery years.
3. Stay equity-heavy by design — with a bond tent. The Kitces-Pfau research recommends a bond tent: higher fixed income at retirement (30–40%), declining toward higher equity over the first 10 years as the SORR window closes. See the SORR guide and simulator.

Month 6: Mid-Year Health Check

By June of your first retirement year, you can start making realistic full-year MAGI projections. Your W-2 income is fixed (you know exactly what you earned). The variables are now: investment draws, Roth conversions, capital gains realizations, and any other income. Run the calculator above again with actuals — not estimates — and check:

• Are you on track to stay below the ACA cliff?
• Do you have Roth conversion headroom left in the 12% bracket?
• Is your Bucket 1 draw rate appropriate, or are you drawing too fast?
• Did you set up an estimated tax payment for Q2 (June 15)?

December: Year-End Action Window

The last month of the year is the highest-leverage planning window. Decisions made in December are permanent for that tax year:

• Finalize Roth conversions. You know your actual W-2 income. Run the bracket math and execute your remaining conversion room before December 31. Conversions must settle — not just be initiated — by year end. Initiate no later than December 20–22 to allow for processing.
• Harvest capital gains or losses. If you're below the 0% LTCG threshold, selling long-term appreciated holdings is tax-free (federal). If you have unrealized losses, harvesting them now offsets any gains or reduces ordinary income by up to $3,000 (with unlimited carryforward). See the tax-gain harvesting and tax-loss harvesting guides.
• Evaluate ACA open enrollment. November 1–January 15 is your annual window to change ACA plans. In Year 2, your income is predictable — you can choose a plan optimized for your actual retirement income level.
• Set estimated Q4 payment. Q4 estimated taxes are due January 15 of next year. Estimate your full-year tax liability and ensure you've either paid enough through the year or are covered by the safe harbor.

Common Year 1 Mistakes and How to Avoid Them

1. Missing the COBRA 60-day window. The window doesn't feel urgent because you're healthy and optimistic. Set a calendar alert the day you separate: 60 days. If you miss it, you may not be able to enroll in an ACA plan until open enrollment (months later), leaving you uninsured.
2. Enrolling in ACA with an income estimate that's too low. If you estimate $40,000 MAGI but your actual income is $70,000 due to partial-year salary, you'll repay every dollar of premium tax credit received. Since OBBBA eliminated the repayment cap, this is now an uncapped liability. Either use COBRA in Year 1 or enroll with an income estimate reflecting full-year reality.
3. Rolling a Rule of 55 401(k) into an IRA. Once rolled, this money is locked until 59½ unless you use SEPP — a 5-year irrevocable commitment. If you're 55–59 and considering a rollover for "simplicity," stop and verify with the Rule of 55 checker first.
4. Waiting until Year 2 to start Roth conversions. Year 1 is often the best conversion year despite MAGI pressure — your last W-2 year creates a known income baseline. Waiting means losing one year of the 5-year clock and often converting at a higher rate in Year 2 when income is fully retirement-income.
5. Drawing from traditional accounts when MAGI is already near the ACA cliff. In Year 1, with partial-year W-2 pushing MAGI near $63,840, even $10,000 in traditional draws can cross the line. Draw from Roth contributions first (doesn't affect MAGI), then taxable LTCG (counts, but may be at 0%), then traditional (always counts as ordinary income). See the withdrawal order guide.
6. Ignoring sequence-of-returns risk in a bull market. Retiring at all-time highs feels safe — you have more money than you projected. But that's when SORR is most dangerous: the next decline is a larger absolute drawdown, and you're just starting your distribution phase. Establish the bond tent and Bucket 1 regardless of market conditions.
7. Not updating beneficiary designations on 401(k) plans. 401(k) beneficiary designations from a previous employer may be years out of date — a former spouse, a parent who has passed, or a charity that no longer exists. These override your will. Update them within 30 days of separation.

1. IRS: Retirement Topics — Contributions — 2026 401(k) deferral limits: $24,500 basic; $32,500 at age 50+ ($8,000 catch-up); $35,750 at ages 60–63 ($11,250 super-catch-up per SECURE 2.0). Source: IRS Notice 2025-67.
2. IRS Rev. Proc. 2025-32 — 2026 ordinary income tax brackets: 12% bracket top = $50,400 TI single / $100,800 TI MFJ; standard deduction $16,100 single / $32,200 MFJ. 22% bracket begins above these thresholds.
3. IRS Topic 409: Capital Gains and Losses — 0% LTCG rate applies to taxable income at or below $49,450 single / $98,900 MFJ for 2026 (Rev. Proc. 2025-32). Qualified dividends receive the same treatment.
4. SSA: Medicare Part B Costs and IRMAA — 2026 IRMAA tier-1: $109,000 MAGI single / $218,000 MFJ; 2-year lookback applies. Surcharges range from $594 to $4,788/yr per person depending on tier.
5. IRS Publication 505: Tax Withholding and Estimated Tax — Estimated tax safe harbors: 90% of current-year liability or 100% of prior-year tax (110% if prior AGI exceeded $150,000). Quarterly deadlines: April 15, June 15, September 15, January 15.
6. HHS Poverty Guidelines 2026 — 2026 ACA 400% FPL cliff: $63,840 single / $86,640 for a 2-person household. MAGI above this level eliminates all premium tax credits. OBBBA (2025) eliminated repayment caps, making excess PTC repayment uncapped.

COBRA election window: 29 CFR § 2590.606-4 (60 days from qualifying event or notice, whichever is later). ACA Special Enrollment Period: 45 CFR § 155.420 (60 days from loss of minimum essential coverage). Roth conversion 5-year rule: IRC § 408A(d)(2)(B). Rule of 55: IRC § 72(t)(2)(A)(v). All values verified June 2026.