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The Fee Gap Was Worth A Few Dollars: How Much Should I Invest Each Month?

by Addison Mitchell
8 min read
what-is-a-good-savings-rate-mteam

Fiachra Dunleavy spent most of a year choosing between two index funds. He had read the comparisons, knew the fee difference to two decimal places and could explain tracking error to anyone unlucky enough to ask.

Over that same year he set aside about six percent of his earnings, a figure he had never actually chosen. It was simply whatever remained.

The fee gap between those funds, against the balance he actually held, came to a few dollars a year. Raising what he put aside by four percentage points was worth several thousand. A year had gone into the smaller lever.

The rate is the lever, and hardly anybody chooses it

Ask what somebody invests in and the answer comes at once. Ask what share of income they save and there is a pause, then a guess. The first is a decision people enjoy; the second sets the date, and most have never made it.

Fiachra was not careless. He contributed monthly without fail, understood compounding and could name a target. What he had never done was put target, timeline and contribution together and see whether they agreed. Setting the target against the contribution took about fifteen minutes.

1 year
spent choosing between two funds
6%
of income saved, never decided
4
percentage points worth more than the fee gap

The fifteen minutes that settled the rate

What went in was unremarkable: earnings, current holdings, the monthly contribution, and the figure and age he had in mind without ever testing one against the other.

a savings rate worked out against a target and a date

What came back · in about fifteen minutes

1 · The rate his own target needed

a percentage, derived from his figure and his date rather than from a rule of thumb. It was higher than six and lower than he had feared, which is usually how this goes.

2 · Checkpoints with dates on them

a hundred thousand, then a quarter of a million, then half, each with an estimated year. A million is a number nobody can picture. The first checkpoint is close enough to aim at.

3 · What moves the date, ranked

rate first, then income, then fees and allocation last. The ordering was the uncomfortable part, because he had spent the year on the item at the bottom.

4 · The same plan at three rates

what happens at six, at ten, at fourteen. Seeing the three dates side by side does more than any argument about discipline.

He settled between the second and third scenario rather than the highest, which is probably why it held. The fund he finally picked was one of the two he had been comparing, and it mattered less than the four points.

The milestone ladder, rung by rung

Rung 1 · Decide the rate rather than inherit it – whatever is left at the end of the month is not a savings rate, it is a residue. Choosing a figure and moving it first is the single change that does most of the work.

Rung 2 · Aim at the first checkpoint, not the million – a hundred thousand is a number a person can hold in their head and reach inside a decade. A million at twenty-nine is an abstraction, and abstractions do not survive bad months.

Rung 3 · Put the levers in order of effect – rate, then income, then costs. Fees and allocation genuinely matter and they matter most once the balance is large, which is precisely when most people stop paying attention to them.

Rung 4 · Revisit once a year and not more – the plan does not improve by being opened weekly, and checking a balance often is a reliable way to make yourself worse at this. An annual look at the rate, against an income that has changed, is enough.

For Fiachra the decisive rung was the third. Nothing he had read about fees was wrong. It was advice about a stage he had not reached yet, applied to a balance where it could achieve little.

Why the fund argument is the more appealing one

Because it costs nothing this month. Researching allocations is free, feels like competence and can go on indefinitely without anybody giving anything up. Raising a savings rate arrives with a bill in four weeks.

It is also where the internet is loudest, which makes it feel like the important question. The quieter one, how much goes in, decides when.

✓ Use
  • A rate chosen deliberately and moved first
  • A first checkpoint close enough to aim at
  • Levers ranked by effect at your current balance
  • Three rates compared against three dates
  • One review a year, against a changed income
✗ Skip
  • Saving whatever survives the month
  • Aiming only at a figure decades away
  • Optimising fees while the balance is small
  • Treating fund choice as the main decision
  • Opening the plan weekly and changing nothing

The order is the entire discipline: choose the rate, aim at the first checkpoint, rank the levers, review annually. Most begin at the bottom of the list, because that is where the interesting reading lives.

checkpoints at one hundred thousand and a quarter million

What it costs next to the alternatives

Fiachra could have gone on comparing funds, which costs nothing and had already consumed a year. Here is how the usual approaches compare with settling the rate first.

Approach Cost What it does about the date
Compare funds and fees Free Optimises the weakest lever at a small balance
A generic rule of thumb Free A number from somebody who has not seen your target
A financial adviser $200–400/hr The right call for allocation and tax, and priced accordingly
First Million Milestone Planner $49 The rate your target needs, with dated checkpoints

“Are the projections not simply guesses about returns?” They rest on an assumed return, and that assumption will be wrong in every individual year, which is worth saying plainly rather than burying. Markets fall, sequences matter, and a date produced today is a planning figure rather than a promise. What the arithmetic does hold up is the comparison between scenarios: whatever returns turn out to be, a higher contribution reaches the number sooner than a lower one, and that part does not depend on the guess. Investing carries risk including the loss of capital, past performance predicts nothing, and none of this is investment, financial or tax advice. A licensed adviser is the right place for allocation and tax questions.

Two more who chose the rate first

a woman who stopped saving whatever was left
★★★★★

“My savings rate was not a decision, it was a leftover, and some months the leftover was nothing. Choosing a figure and moving it on payday changed more in one month than two years of reading had.”

Grainne S. · thirty-four, started at nine percent, Spokane WA

a man who aimed at a hundred thousand instead of a million
★★★★★

“A million was so far away it may as well have been fictional, so I never behaved as though it existed. Aiming at the first checkpoint instead made it something I could actually be ahead or behind on.”

Odhran B. · twenty-nine, first checkpoint in sight, Erie PA

If the rate is settled and the trouble is moving it every month without thinking, the Set & Forget Savings Plan is built for that part. Results vary; this is general guidance and not investment advice.

Fifteen minutes, and the argument leaves fund choice for good: the rate your target needs, checkpoints with years attached at a hundred thousand and a quarter of a million, the levers ranked by what they do at your balance, and the plan at three rates. The fund question keeps. It never set the date.

WORK OUT MY SAVINGS RATE

*Individual results may vary.

FAQ

What savings rate should you aim for?

There is no single number, and anyone offering one has not seen your target or your timeline. The rate you need is the one that reaches your own figure by your own date, and it can be calculated rather than guessed. First Million Milestone Planner works it out from your numbers.

Is the rate more important than the returns?

In the early years, yes, by a wide margin: what you add far outweighs what a few points of return can do to a small balance. Later it reverses. Most people spend the early years optimising the weakest lever.

Why do people argue about funds instead?

Because fund choice is interesting, feels like expertise and can be researched indefinitely without changing anything. Lifting the savings rate is dull and costs you something this month, which is an entirely different sort of decision.

What if the rate the target needs is out of reach?

Then either the target or the timeline moves, and knowing which is useful rather than a failure. A date you can reach beats a figure you quietly stopped believing. First Million Milestone Planner shows you both.

How often should it be reviewed?

Annually is enough for the plan itself, with the checkpoints doing the work between. Incomes change, and the rate that suited you at twenty-eight rarely suits you at thirty-four.

Is this investment advice?

No. This is general educational guidance rather than investment, financial or tax advice. Investing carries risk including loss of capital, projections rely on assumed returns that will not match reality year to year, and past performance predicts nothing. Speak to a licensed adviser about your own circumstances.
avatar
by Addison Mitchell
With a background in advertising and PR, Addison has a sharp eye for what makes a story land and how people actually make decisions. She specializes in turning real customer experiences into articles that show readers what's possible when they find the right tool at the right time.
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