Semi-Retirement

Semi-retirement is a working arrangement in which someone leaves full-time career employment but keeps earning — reduced hours somewhere new, contract or consulting work, or self-employment — so that earnings cover part of living costs while savings, a pension, or Social Security cover the balance.

It is worth saying plainly that this is a colloquial term. Nothing in the tax code, in ERISA, or in Social Security law defines semi-retirement, sets an age for it, or attaches a status to it, so no form asks whether you are semi-retired. Three neighbouring ideas are easy to confuse with it. Phased retirement is an employer-side program — an arrangement with your existing employer to cut hours, sometimes while drawing part of a pension, and federal employees have a statutory version of it. "Partial retirement" is a measurement category used in retirement economics, which blends objective hours worked with how people describe themselves, and it exists so researchers can count something. Barista FIRE and Coast FIRE are the FIRE movement's branded versions of much the same underlying arrangement, sized against a specific savings target.

The financial power of semi-retirement is that earned income pulls two levers at once. First, a dollar earned is a dollar the portfolio does not have to distribute, which lowers the withdrawal rate directly. Second, and less obvious, it buys another year in which the balance stays invested and any tax-deferred growth keeps compounding untouched — so the effect is not just smaller withdrawals this year but a larger base for every year afterwards. Modest earnings can therefore move a plan a surprising distance. How far is an arithmetic question rather than a rule of thumb, and sustainable withdrawal analysis belongs to safe withdrawal rate.

Health coverage is where most semi-retirement plans succeed or fail before age 65. Employer plans generally condition eligibility on an hours threshold, so cutting back can end coverage even though the job continues — and a reduction of hours is itself a COBRA qualifying event, which at an employer with 20 or more employees generally means up to 18 months of continuation coverage at your own cost. There is a trap in leaning on COBRA near 65: COBRA is not treated as coverage based on current employment, so it does not extend the eight-month Medicare Part B special enrollment period, which runs from the end of employment or of current-employment group coverage. Riding COBRA past that window can produce a Part B late-enrollment penalty that lasts for life. The alternative is usually the individual marketplace, where premium tax credits phase down as reported income rises and, under current law, cut off entirely above a threshold — so a semi-retiree's marketplace premium depends heavily on how much they choose to earn and realize.

Two other rules catch people. If Social Security is already being claimed and full retirement age has not arrived, the retirement earnings test withholds $1 of benefit for every $2 of earnings above an annual exempt amount ($24,480 for 2026), tightening to $1 for every $3 in the year full retirement age is reached ($65,160, counting only the months before that birthday) and stopping entirely from the month full retirement age arrives. Only earned income counts — wages and net self-employment earnings. Pensions, annuity payments, IRA and 401(k) distributions, interest, dividends, capital gains, and rents are all outside the test, so "earning too much in retirement" is only ever about money earned from work. And in the first year of entitlement the Social Security Administration may apply a monthly rather than annual test, so someone who semi-retires mid-year after high earnings can still be paid for the later months.

Finally, going part-time at the same employer is not a separation from service, so it does not open the rule of 55 — that exception needs an actual separation in or after the year you turn 55. The pre-59½ access routes and their conditions belong to early withdrawal penalty, and what changes when work stops altogether rather than merely shrinking belongs to early retirement.

The mechanics are ordinary: reduce or replace the work, size the shortfall, and cover it from savings — then check the three things that bite, which are health coverage, whether Social Security is being claimed before full retirement age, and whether any pre-59½ withdrawals are involved.

A hypothetical example. Dana is 61, spends $66,000 a year, and has $850,000 invested. Stopping outright would mean withdrawing the whole $66,000 in year one — about 7.8% of the portfolio. Instead she takes a three-day-a-week role paying $34,000, so the portfolio only has to produce $32,000, or about 3.8%. Over the four years to Medicare eligibility at 65 that is 4 × $34,000 = $136,000 she never withdrew: money still invested and still compounding, plus four fewer years the portfolio has to cover on its own. She is not claiming Social Security yet, so the earnings test does not touch her — but leaving her old job ended her coverage there, and the new role is below its plan's hours threshold, so she is pricing a marketplace policy against COBRA and watching how much she realizes each year. All figures are illustrative.

Pros

• Earned income lowers the withdrawal rate and leaves the balance invested for longer, which is two benefits from one paycheck.
• It is available immediately and needs nobody's approval, unlike an employer program.
• Part-time or contract work can supply structure, colleagues, and a graduated exit rather than an abrupt one.
• Delaying Social Security and portfolio withdrawals at the same time is usually easier when some income is still arriving.

Cons

• Losing employer health coverage is often the single largest cost, and marketplace premiums move with the income you report.
• The income is not guaranteed — part-time and contract work can disappear in a downturn, which is exactly when the portfolio is also down.
• Earnings can reduce Social Security benefits already being claimed before full retirement age, and can raise the taxable share of those benefits.
• Self-employment income carries self-employment tax and its own administrative load, which surprises people leaving a W-2 job.
• It is easy to drift into working more than intended for less than the career job paid.