When do investment returns overtake your contributions?

Why a $2 million portfolio feels different

A recent r/fican thread put a number on a familiar feeling: the poster reported crossing $2 million invested at 38 and described a portfolio that now moves more than a salary does. The figures are self-reported and nothing below depends on them being exact. What makes the thread worth an article is that the feeling has arithmetic underneath it, and the arithmetic kicks in at balances far smaller than $2 million.

At that balance the feeling is not an illusion. A $2 million portfolio assuming a 5% year is expected to add $100,000, and $140,000 at 7%. Very few people save $100,000 in a year, so somewhere on the way to that balance the market quietly took over as the larger contributor. The interesting question is where the handover happens, and it happens much earlier than most people guess.

The balance where expected growth overtakes contributions

The line has a one-division answer. Growth overtakes contributions, in expectation, at the balance where the assumed return on the balance equals a year of adding: crossover balance equals annual contribution divided by assumed annual return. Someone adding $1,500 a month crosses at $360,000 on a 5% assumption and $257,143 at 7%. These figures are deterministic arithmetic on two stated assumptions, not forecasts: change either input and the line moves with it.

Two things in the table deserve notice. The crossover falls as the assumed return rises, because a stronger market needs less capital to outwork you. And every figure sits inside the range ordinary savers actually reach, so this is not a $2 million phenomenon. It is a mid-career one.

• $500 a month ($6,000 a year): crossover at $120,000 assuming 5%, $85,714 assuming 7%.
• $1,500 a month ($18,000 a year): crossover at $360,000 assuming 5%, $257,143 assuming 7%.
• $3,000 a month ($36,000 a year): crossover at $720,000 assuming 5%, $514,286 assuming 7%.
• $5,000 a month ($60,000 a year): crossover at $1,200,000 assuming 5%, $857,143 assuming 7%.

Why daily volatility is the wrong comparison

The comparison people actually make is a different and worse one. A 1% move on a $2 million portfolio is $20,000, a month of heavy contributions gained or erased between breakfast and lunch, and balances far below the crossover already swing more in a day than they add in a week. Watching that and concluding the contribution no longer matters mixes noise with signal.

The crossover compares expectations: a full year of assumed growth against a full year of adding. A daily move is one draw from a distribution wide enough that a single session routinely exceeds the whole annual expectation in either direction. The contribution is deterministic and always positive; the growth is neither, and that asymmetry is what the next section is about.

Contributions still buy time and reduce dependence on returns

Past the crossover, contributions stop being the engine and start being control. A contribution shortens the time to any fixed target directly, and it is the only input in the plan that does not need markets to cooperate. In a flat or falling decade it is the entire source of progress, and the same dollar buys more shares exactly when prices are down.

Adding also reduces dependence on the assumption itself. A plan that needs 7% to work is a different plan from one that needs 5%, and continued contributions are how you move from the first to the second without touching the target or the date. That margin matters most near the end, because sequence of returns risk concentrates the damage in the years just before and after the finish line.

When spending the contribution can be rational

None of this makes stopping irrational. Past the crossover a contribution is a marginal improvement to a plan that mostly runs itself, and money has competing uses with deadlines compounding does not respect: a career break while children are young, work that pays less and gives more, health that will not wait. Spending the contribution is a real decision with a real price, and the price is denominated in time rather than dollars.

The honest way to decide is to price it rather than moralise it. If the balance already reaches the target on growth alone by the date you need it, the contribution is optional and the only question is what the money buys elsewhere. If it does not, the contribution is load-bearing, and the question becomes which year of the plan you are giving up.

Run your own Coast FIRE range

That pricing question has a name, Coast FIRE: the balance at which existing savings alone reach the target with no further contributions. The Coast FIRE calculator solves it across a low, base, and high real return and reports the range rather than one flattering age, which is the form an assumption-driven answer deserves. Put your own balance, contribution, and target in and read where your crossover sits against your coast number.

The two numbers answer different questions. The crossover says who is doing the work this year; the coast number says whether the work is finished. Both are one division deep, and both are worth knowing before the next 1% day tries to tell you something.