The Two-Phase Pattern

Phase 1 (typically ages 62–68). The household has left full-time work but kept some part-time income — consulting, tutoring, seasonal work, hourly roles. Maybe a small pension. Maybe one spouse's Social Security has started but the other's hasn't. Portfolio withdrawals are modest.

The tax burden during Phase 1 is often surprisingly low — part-time wages plus a small pension plus modest IRA withdrawals can land within the 12% federal bracket, even when the underlying portfolio is substantial. Roth conversions in Phase 1 are unusually cheap.

Phase 2 (typically starting at 67–70). Social Security claims at FRA or 70. Part-time work winds down or ends. The household becomes fully untethered from a job calendar for the first time in 50+ years. RMDs at 73 are within sight. The tax structure shifts as Social Security stacks under whatever portfolio withdrawal the lifestyle requires.

The Financial Recalibration

Social Security becomes the income floor. Whatever the household had been pulling from the portfolio in Phase 1 partially gets replaced by Social Security in Phase 2. For a couple where the higher earner deferred to 70, this can be $40,000–$60,000 a year of new guaranteed income arriving more or less overnight.

The Roth conversion window narrows. Phase 1 was the cheap window — low income from part-time work plus voluntary IRA draws. Phase 2 raises the household's baseline ordinary income (Social Security) and starts to layer in RMD requirements. The bracket floor goes up. The conversion math changes.

Spending may stay roughly constant — or shift. Many households find Phase 2 spending actually decreases (less commuting, less work-related expense, more time at home) at first. Others find it increases (more travel, the “what now” effect driving discretionary spending). The plan should account for both possibilities.

IRMAA comes into focus. When Social Security and IRA withdrawals are both flowing, the modified AGI math is much closer to IRMAA tier thresholds. December planning matters more in Phase 2 than it did in Phase 1.

Real Scenario: A 70-Year-Old Entering Phase 2

A retiree turning 70 has spent 2.5 years in Phase 1: a $15,000-a-year tutoring job, $8,000 of pension income, his wife's Social Security ($14,000), and modest portfolio withdrawals (~$25,000). Total income: ~$62,000. Federal tax: roughly $1,500. He's done $30K–$60K/year of Roth conversions in the 12% bracket.

Phase 2 begins when he claims Social Security at 70 — say $42,000/year because of delayed retirement credits. Wife's spousal benefit may also adjust. Combined Social Security: roughly $58,000. Add the small pension, modest IRA draws, and zero part-time wages. Income looks very different — but more importantly, federal tax jumps because the Social Security stacks under any portfolio withdrawal.

The planning move: The 12% Roth conversion bracket headroom shrinks. The 22% bracket becomes more relevant. Conversions that would've cost 12% in Phase 1 may cost 22% in Phase 2. Whatever was on the conversion plan that didn't happen by the SS letter probably doesn't happen at all — at least not at the same rate.

The lifestyle move: The tutoring job stops or scales down. The structure it provided — weekly schedule, social contact, identity — needs to be replaced deliberately, or it won't be replaced. Many retirees find this transition harder than the original retirement, because the part-time work had quietly been doing more for them than they realized.

The Lifestyle Transition Most Households Underestimate

In Phase 1, the part-time work or volunteering structures the week. There's a reason to get up Tuesday at 9:00. Phase 2, by design, removes that anchor.

The retirees who handle Phase 2 well typically replace the structure deliberately:

• A regular volunteer commitment with weekly cadence (not ad hoc).
• A learning project with milestones — a language, a musical instrument, a craft, a course.
• A standing social commitment — a card group, a hiking group, a coffee group.
• A travel rhythm with planning ahead, not reactive trips.
• A meaningful family role (regular grandchild care, ongoing project with adult children).

The retirees who don't do this often experience 6–18 months of drift. Some return to part-time work for non-financial reasons. The drift is preventable, but only with intent.

The Pre-Phase-2 Checklist

2–3 years before the expected Phase 2 transition, the household benefits from a deliberate review:

• Confirm Social Security claiming strategy. Whoever deferred to 70 should claim within the recommended window. Spousal benefit interactions get re-checked.
• Run the residual Roth conversion analysis. How much more is worth converting before the bracket floor rises?
• Project the next 5–10 years of RMDs. What income floor do they create at 73?
• Update the IRMAA-aware withdrawal plan. Phase 2 numbers are usually closer to tier cliffs than Phase 1.
• Plan the lifestyle replacement for the part-time work.
• Consider whether part-time work continues at reduced hours, ends fully, or shifts to volunteering.

When Phase 2 Is the Right Time to Stop Working

For most retirees, Phase 2 is a natural exit point for part-time work — Social Security and the larger portfolio withdrawals together replace the income, and the structure can be replaced with deliberate alternatives.

For some retirees, the part-time work is the right thing to keep regardless of money — because of the social structure, the sense of purpose, or the people. There's no requirement to stop at 70 just because Social Security started.

The decision usually rewards being made deliberately rather than defaulting to either path.

Common Mistakes

• Treating retirement as a single transition rather than the multi-phase event it usually is.
• Letting Phase 2 happen by default — claiming Social Security on the default schedule, stopping part-time work without a replacement plan.
• Missing the last call on Roth conversions before the bracket floor rises with Social Security.
• Underestimating the lifestyle adjustment of losing part-time work as a social and structural anchor.
• Not running the IRMAA-aware withdrawal projection for the Phase 2 income mix.

The Bottom Line

In a way, Phase 2 is retiring all over again. Different income mix, different daily structure, different tax profile, different question of how to spend the time. Households who treat it as a planning event tend to transition smoothly. Households who treat it as just a calendar event often experience a second adjustment period that didn't need to happen.

The Social Security letter is a useful trigger. It usually arrives 2–3 months before claiming, which is exactly the right window for the broader Phase 2 plan to come together.