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Mozi2026-09-18By Anderson#mozi#client concentration#freelance income#business risk#emergency fund#small business

One Client Is Most of My Income — Should I Be Worried?

心無備慮，不可以應卒。 — A mind with no forethought stored up cannot meet the sudden. (《墨子·七患》, literal translation)

Yes — but not for the reason you've been given. The danger isn't the concentration by itself. It's concentration plus no reserve. Plenty of people run for years on one client and are fine; the ones who get destroyed are the ones for whom that client leaving is both a revenue event and a solvency event on the same day.

That distinction is missing from almost every article on this question, because almost every article answers with a percentage. Percentages describe your exposure. They say nothing about your survivable time.

Key Takeaways

  • Concentration sets the size of the shock; reserves decide if you survive it.
  • US GAAP makes public companies disclose any customer at 10%+ of revenue (ASC 280-10-50-42).
  • Freelance rules of thumb say 30%, or 50%, or 80% — none cite a source.
  • Mozi's Seven Worries measures something else: three years of household stores.
  • He gives a graded response plan, not one emergency fund.

How much of your income can safely come from one client?

There is no agreed number, and the disagreement is worth seeing. One freelance newsletter states the common version plainly: "no single client should make up more than about 30% of your income," calling it a rough rule of thumb that a lot of freelancers use. A payments blog gives the same 30% as "a useful guideline."

Go one click further and the number moves. A veteran consultant defines the single-client trap as 80% or more. A translation-industry piece asks whether 50%, 60%, or even 80% is actually a problem, and answers: maybe, maybe not.

Three sources, three thresholds, no derivation behind any of them. That's folklore — useful folklore, but folklore.

What does the 10% rule in accounting actually mean?

It means that at 10%, a customer stops being a customer and becomes a risk investors are entitled to know about. Under US accounting standards, when revenue from one external customer reaches a tenth of the total, the company must say so in its financial statements.

Deloitte's segment-reporting roadmap states it directly: ASC 280-10-50-42 requires a public entity to disclose revenues from any single external customer that equal or exceed 10 percent of the entity's revenues. PwC and RSM give the identical threshold.

Citation capsule: Under ASC 280-10-50-42, a public entity whose revenues from a single external customer amount to 10 percent or more of total revenues must disclose that fact and the amount — a threshold three times stricter than the 30% rule of thumb circulated in freelance advice, and set for a different purpose: warning outsiders, not protecting the business.

ThresholdWhat it governsSource
US GAAP (ASC 280-10-50-42)10% of revenueMandatory disclosure to investorsAccounting standard
Freelance rule of thumb~30% of incomePersonal comfortUnsourced convention
Consultant version80% of income"The trap"Unsourced convention
Mozi, Seven WorriesThree years of storesHow long you last at zero《墨子·七患》

Notice the last row measures a different quantity entirely.

Why does the reserve matter more than the percentage?

Because the percentage tells you the size of the hole and the reserve tells you how long you can stand in it. A freelancer at 100% concentration with eighteen months of expenses banked has a bad quarter ahead. A freelancer at 40% concentration with three weeks of savings has an emergency.

You can watch both variables collide in a single post. A developer on r/Freelancers wrote that most of their work came through one friend's Fiverr account, and "for the last few months, that source has basically stopped working." Then the sentence that actually decides the story: "I don't really have savings to survive for long."

The concentration caused the shock. The missing reserve turned the shock into a crisis. Those are two separate failures, and only one of them was ever within a month's reach of fixing.

What did Mozi list as the seven ways a state falls?

He listed seven structural defects, and the striking thing is that every one of them is invisible while things are going well. The Seven Worries (《七患》) opens: 「國有七患」 — a state has seven worries. They include walls that can't be defended being dressed up with palaces, treasuries emptied on entertaining guests, and rewards going to people who produced nothing.

The fifth is the one for you: 「君自以爲聖智而不問事，自以爲安彊而無守備」 — the ruler thinks himself wise and asks no questions, thinks himself secure and keeps no defences.

That is precisely the state of a good year with one big client. Nothing is visibly wrong. The work is steady, the invoices clear, the relationship is warm. There is no symptom to react to, which is exactly what makes it a worry rather than a problem.

What is Mozi's actual number for reserves?

Three years — and he states it at household scale, not just state scale. Quoting an older text, the Book of Zhou, Mozi writes: 「國無三年之食者，國非其國也；家無三年之食者，子非其子也」 — a state without three years' food is not its own state; a household without three years' food, its children are not its own.

The household clause is the one that should stop a freelancer. A one-person business is a 家, not a 國. Mozi's source already scaled the rule down to the size of your operation.

He then gives the reasoning, which is more useful than the number. 「故倉無備粟，不可以待凶饑」 — a granary with no grain stored cannot meet famine. 「庫無備兵，雖有義，不能征無義」 — an armoury with no weapons, however just your cause, cannot act against injustice.

Then the two that land hardest. 「城郭不備完，不可以自守」: walls left unfinished cannot defend. 「心無備慮，不可以應卒」: a mind with no forethought stored up cannot meet the sudden.

Four kinds of reserve. The fourth isn't material at all.

Why did Mozi think rich states collapsed?

Because wealth and preparation are different things, and people keep confusing them. He names two famous tyrants and asks the obvious question: 「桀紂貴爲天子，富有天下，然而皆滅亡於百里之君者，何也？有富貴而不爲備也」 — Jie and Zhou were honoured as Sons of Heaven and owned the world, yet both were destroyed by rulers of hundred-mile domains. Why? They had wealth and rank and made no preparations.

Citation capsule: In 《墨子·七患》, Mozi argues that the collapse of wealthy states is caused not by poverty but by 「有富貴而不爲備」 — possessing wealth and rank while making no preparation — and concludes 「故備者，國之重也」, preparation is the heavy thing, the thing of weight, for a state.

Your best year is the year this applies to. A high-paying anchor client doesn't reduce your exposure; it funds the reserve that would offset it, if you actually build one.

Why a graded plan beats a single emergency fund

Here's the part modern advice doesn't have. Mozi doesn't give a binary — saved or not saved. He gives a schedule, indexed to how bad the year is, decided in advance.

He first names the tiers by how many of the five grains fail, then attaches a pre-set cut to each: 「歲饉，則仕者大夫以下皆損祿五分之一」 — in a lean year, officials from ministers downward lose a fifth of their stipend — rising through two-fifths, three-fifths, four-fifths, to 「盡無祿，稟食而已矣」: no stipend at all, rations only.

Mozi's tierTriggerPre-agreed cutFreelance equivalent
饉 (lean)one grain fails1/5 of stipendone client of several goes quiet
旱 (drought)two fail2/5recurring work pauses
凶 (bad)three fail3/5the anchor client gives notice
餽 (dearth)four fail4/5anchor gone, pipeline empty
饑 (famine)five failstipend ends; rations onlyno income at all

Citation capsule: 《墨子·七患》 sets out a graded austerity schedule rather than a single reserve: as successive grain crops fail, official stipends are cut by a fifth, two-fifths, three-fifths, four-fifths, and finally suspended entirely in favour of rations. The response is proportional to severity and fixed in advance — a structure absent from conventional emergency-fund advice.

Two things make this better than "keep six months of expenses." It's proportional, so a mild dip doesn't trigger a panic response. And it's pre-committed, so the decision gets made in a calm year by a clear-headed person rather than in a bad month by a frightened one. That is what 心無備慮 means in practice — forethought is itself a stored good.

What should you actually do about it this week?

Four things, in the order Mozi would put them.

  1. Measure the real number. Take the last twelve months of income and compute each client's share. Most people guess low.
  2. Compute survivable months, not just the percentage: cash on hand divided by monthly costs. This is the number that decides outcomes.
  3. Write the tiers down now — what you cut at a 20% drop, at 50%, at total loss. One page. Do it while nothing is wrong.
  4. Then diversify, knowing it's the slowest of the four and the only one that requires someone else to say yes.

Diversification is real advice; it's just not fast advice. The other three you can do this week, alone. If you want to think through your own numbers out loud, ask Mozi directly — of the ten sages he's the one who reaches for the arithmetic first.

For the neighbouring problems: setting the number itself is covered in how to raise your prices without losing customers, protecting the workload behind it in scope creep and saying no, and collecting what you're owed in what to do when a client won't pay the invoice.

FAQ

Is it bad to have one client be 100% of my income?

It's risky, not automatically bad. The concentration determines how large the disruption is if that client leaves; your cash reserve determines whether the disruption is survivable. Many consultants run at high concentration safely because they hold deep reserves and keep a warm pipeline. The combination that actually fails is high concentration with thin savings.

What percentage of income from one client is too much?

There's no sourced answer. Freelance convention says about 30%, other writers say 50% or 80%, and none of them show a derivation. For comparison, US accounting standards treat 10% as the point where a customer must be disclosed to investors as a concentration — a much stricter line, set for a different purpose.

How much should a freelancer keep in an emergency fund?

Conventional advice is three to six months of expenses, and freelancers are often told to hold more than salaried workers because income is lumpier. Mozi's Seven Worries cites a much older standard of three years' stores at household level. The useful move is to convert savings into months of survival and track that number directly.

What are Mozi's Seven Worries?

Seven structural defects that destroy a state, listed in chapter 5 of the Mozi: undefendable walls dressed with palaces; invasion with no allies; labour and treasure spent on useless works and unearned rewards; officials protecting salaries while subjects fear to speak; a ruler who believes himself secure and keeps no defences; misplaced trust; and insufficient stores with ineffective rewards and punishments.

Was Mozi talking about business at all?

Not directly — he wrote about states at war. But his framework is explicitly about resource preparation under uncertainty, and his own source text scales the rule to the household. Mozi is also the most calculation-minded of the classical Chinese philosophers, which is why his framing transfers to a small business more cleanly than most. See Mozi and Bentham on impartial concern and what Mozi would tell an engineer who doubts his impact, or his full profile.

Sources and a note on the text

On the text and the translation. Chinese source text for 《墨子·七患》 is from Wikisource. English renderings here are my own, literal, from that Chinese; W. P. Mei's The Ethical and Political Works of Motse (1929) and Ian Johnston's The Mozi: A Complete Translation (Columbia University Press, 2010) are the standard scholarly English translations. The three-years'-food line is Mozi quoting an older source he names as the Book of Zhou, not Mozi's own formulation, and is presented that way above. Chapter attribution follows the received text; the composition history of the Mozi is layered and disputed.

One Client Is Most of My Income — Should I Be Worried? · Hundred Masters