Accrual vs Cash: Two Ways to Tell the Truth About a Year

In December I had the best month I'd ever had, and I spent it in a state of quiet dread that I couldn't account for and eventually put down to seasonal affective disorder.

Eight thousand pounds landed. I remember watching it arrive on the twelfth and feeling — nothing much. Then January came, four hundred quid in the account by the middle of the month, and I was in a genuine panic about whether the whole thing was over.

Both feelings were correct. That's the part that took me years.

December was my best month for cash and my worst month for work. January was the exact inverse. I had been reading one book and living in the other, and the mismatch produced a sensation I kept diagnosing as a mood.

The definitions, from the authority¶

IRS Publication 538 states both methods in about twenty words each, and the phrasing is worth having exactly rather than paraphrased.

Cash method: you report income "in the tax year you receive it" and "deduct expenses in the tax year in which you actually pay them."

Accrual method:

“

Under the accrual method, you generally report income in the tax year you earn it, regardless of when payment is received... You deduct expenses in the tax year you incur them, regardless of when payment is made.

”

Two words do all the work: receive versus earn. Everything else follows.

Whether you get the choice depends on size. The IRS applies a gross receipts test — a corporation or partnership qualifies to use the cash method if "its average annual gross receipts for the 3 prior tax years were $26 million or less (indexed for inflation)."

The same four months, twice¶

Here's a freelancer who invoices on completion and gets paid, as freelancers do, about thirty days later.

Month	Accrual: work done	Cash: money received
October	£6,000	£0
November	£8,000	£6,000
December	£2,000	£8,000
January	£9,000	£2,000
February	£0	£9,000

Read December across. Cash says £8,000 — the best month of the year. Accrual says £2,000 — the worst month of the year. Nothing is wrong with either number. December was the month in which November's money arrived and almost no work happened, and those are two separate facts about the same thirty-one days.

Then January inverts it perfectly: £2,000 in the account, £9,000 of work done. The panic I felt in mid-January was a cash reading of an accrual triumph.

This is why the accounting profession did not settle the argument. There is no winner. A business that reports on accrual and manages on cash is not being inconsistent; it's using two instruments that measure different things, exactly as a pilot uses both an altimeter and a fuel gauge.

What individuals actually do¶

Now the part this desk exists for.

You keep one book. It's the cash one, and you didn't choose it — it's just what the banking app shows you, updated in real time, on the device in your pocket.

Meanwhile your genuine position is entirely accrual. You have earned money you haven't received. You owe tax you haven't been asked for. You've incurred obligations — the wedding in June, the boiler that will fail, the invoice on 30-day terms that is now on day forty-one. None of that appears in the number you check twelve times a day, and that number is nevertheless the one governing how expansive or frightened you feel.

That's the same structural point as the money in your account that isn't really yours, coming at it from the other side: working capital is what's left after the accrual view is subtracted from the cash view. The two pieces are the same equation read in opposite directions.

And it produces a specific, predictable failure. Decisions get timed to collection days. The month a big invoice lands feels like the month you can afford something, when in fact that money was earned two months earlier and has been spoken for since. You are not making a financial decision; you are responding to a deposit notification with a lag built into it by someone else's payment terms.

The turn¶

The tempting conclusion is that accrual is the grown-up method and you should switch to it. I don't think that's right, and the reason matters.

Accrual is better at telling you whether the thing is working. Cash is better at telling you whether you survive the month. If you only keep one, keep cash — being right about your business while unable to pay for it is a well-documented way to stop having a business.

The actual failure isn't the choice of book. It's keeping one and forgetting it's a choice.

Because there's a second-order effect, and it's the reason this belongs on The Ledger rather than in a bookkeeping guide. What you track, you become. A person who only ever sees the cash view starts optimising for it — chasing the collection, discounting for early payment, taking the badly-priced job that pays fast over the well-priced one that pays in sixty days. Those are rational moves given the instrument, and they systematically degrade the underlying business the accrual book would have shown you.

The instrument doesn't just measure the thing. Over enough time, it selects what the thing becomes.

That's also why treating a persistent deficit as if it were a reserve problem fails so reliably — same error, different account. A stock reading of a flow problem tells you a comforting and useless story, and you can run on it for years before the other book catches up with you.

Keeping both¶

1. 1

   Once a month, write two numbers

   Money received this month, and work completed this month. Two figures, five minutes, on the same line so you can see them beside each other. That's the whole intervention — you are not adopting double-entry, you are just refusing to see only one of them.

2. 2

   When they diverge sharply, ask which one is the signal

   A big gap in either direction is information. Cash far above accrual means you're collecting a backlog and the work has slowed — the earliest warning you will get. Accrual far above cash means the work is there and your payment terms are the problem, which is fixable and entirely different.

3. 3

   Make expansion decisions on accrual, survival decisions on cash

   Hiring, committing, taking on a lease: accrual, because those are bets on whether the underlying thing works. Can I pay this on Friday: cash, always, no exceptions. Most bad decisions I've watched came from using the wrong instrument for the class of decision.

4. 4

   Book the tax the day the income is earned, not the day it lands

   The single highest-value accrual habit available to anyone self-employed. Money that arrives with tax already mentally deducted never becomes a January surprise — and if you want the mechanics of what you actually owe, the small business tax basics cover it properly.

5. 5

   If you keep any records at all, make them accrual-capable

   Log the invoice date and the payment date separately. It costs one extra field and it means you can produce either view later. The twenty-minute-a-week bookkeeping system already does this — most people just never look at the first column.

January¶

The panic in that January was, in retrospect, the most useful information I received all year — and I misread it completely.

Four hundred pounds in the account said this is over. The other book, which I wasn't keeping, said I had just completed the largest month of work I'd ever done and would be paid for it in about three weeks. One of those was a fact about my business. The other was a fact about somebody else's payment terms.

I made two decisions that January on the strength of the wrong one. Took a badly priced job because it paid on completion. Turned down a better one because it was sixty-day terms and I couldn't face the gap. Both were rational responses to the only instrument I had, and both were, on the numbers I couldn't see, straightforwardly wrong.

Two numbers. Once a month. Written on the same line so you cannot look at one without the other.

The year hasn't got a single story in it. It never did — you were just reading the book that updates in real time and mistaking the refresh rate for the truth.

It's just business.

Sources

1. IRS Publication 538 — Accounting Periods and Methods
   +How this was checked

   Cash method: report income 'in the tax year you receive it' and 'deduct expenses in the tax year in which you actually pay them.' Accrual method: 'report income in the tax year you earn it, regardless of when payment is received... You deduct expenses in the tax year you incur them, regardless of when payment is made.' Gross receipts test: a corporation or partnership qualifies for the cash method if 'its average annual gross receipts for the 3 prior tax years were $26 million or less (indexed for inflation)' — the publication states the indexing itself, so the figure rises over time and should be checked at source rather than quoted from here.

2. Worked example — arithmetic shown in full above
   +How this was checked

   No external figures. Work completed October to January of £6,000 / £8,000 / £2,000 / £9,000, invoiced on completion and paid roughly thirty days later, produces a December that reads as £8,000 on cash and £2,000 on accrual, and a January that reads as £2,000 on cash and £9,000 on accrual — an exact inversion of best and worst month across the two books.