How a Services Firm Found Two Years of Payroll Landing in the Wrong Month

How a Services Firm Found Two Years of Payroll Landing in the Wrong Month

This is an illustrative anonymized composite drawn from patterns that recur in service business bookkeeping. It is not a specific client engagement, and no outcome described here is guaranteed or predictive of anyone else's result.

A payroll accrual in the wrong month is a boring problem with a dramatic symptom. The owner's question was reasonable. "Why does my gross margin move five points when nothing about my business moves at all?"

Headcount was flat. Bill rates had not changed. Client mix was the same six accounts it had been for a year. And month to month, the margin line wandered several points in both directions with no explanation anyone could offer.

The answer turned out to be exactly that, running quietly for two years. Nothing was misstated on any tax filing, and nothing was missing from the bank. The books were simply putting labor in a different period than the revenue it produced.

How a Payroll Accrual in the Wrong Month Happens

The firm ran a biweekly payroll and booked each run when the money left the bank. That is how most small firms do it, and for a while it is fine.

Biweekly means 26 pay runs a year, not 24. Twelve months cannot absorb 26 evenly, so two months each year carry three payroll runs instead of two, and in years with an extra pay date there can be a third such month. Those months show roughly 50 percent more labor cost against a completely ordinary amount of revenue.

Then the second effect compounds it. When a pay date falls just after month end, the labor for the last week of the month gets recorded in the following month. Sometimes that lands on a three-payroll month and sometimes it does not, so the distortion is not even consistent year to year.

Put together, the margin line was reporting the position of weekends on a calendar.

Why a Payroll Accrual in the Wrong Month Goes Unnoticed

This is the part that makes the pattern durable.

Every individual entry was correct. Each payroll run was recorded at the right amount, on the right date, to the right accounts. The bank reconciled every month without exception. The annual totals were right, so the tax return was right and the accountant who prepared it had no reason to look.

Nothing ever produced an error message, because nothing was an error. The books were answering "when did cash leave" with complete accuracy. The owner was asking "what did this month cost to deliver," and no one had noticed those were different questions.

Worth saying plainly, because it is the part people worry about first: the payroll tax deposits were correct and on time, and the filings were fine. This was a period allocation problem inside the books, not a compliance problem.

What It Actually Cost

Not dollars. Decisions.

Two things had gone wrong in the two years. A hiring plan had been paused in a month that only looked bad, and the pause held for a quarter because the following month was also weak, that time because a pay date landed just after month end and pushed a week of labor forward. The firm had capacity it did not add while demand was there.

In the other direction, a bonus pool had been sized off a strong quarter that was partly an artifact of where pay dates fell. It was funded, it was paid, and it was larger than the underlying performance supported.

Neither decision was unreasonable given what the owner could see. That is the actual lesson. Bad numbers do not produce obviously bad decisions; they produce confident ones.

The Fix Was a Cutoff, Not a Rebuild

The instinct was to go back and re-enter two years of payroll. That was the wrong move, and it got talked down.

What the firm implemented instead was a payroll accrual at each month end: recognize the labor cost for days worked through the last day of the month, regardless of when the pay date falls, and reverse it in the following period. Applied consistently going forward, with a single restatement of the trailing period so the comparison had something to sit against.

This is the sort of change System Six is built for. The firm is based in Seattle, was founded in 2009, has 41 employees, and serves clients nationwide, working with small businesses generating between $1 million and $10 million in revenue. Its stated focus includes modernizing a finance function, and a monthly cutoff discipline is exactly that kind of change: small, procedural, and permanent.

The limitation: System Six lists a $1 million revenue minimum, so smaller firms are outside its scope. Ask for references at your size and in your industry, and ask who performs the monthly work rather than who runs the engagement.

What the Restated Numbers Showed

A duller business than either version had suggested.

The margin swings largely flattened. The quarter that had funded the bonus pool came down toward the trend. The months that had triggered the hiring pause came up. The full-year totals did not move at all, because nothing about the year had changed.

That is the honest characterization of the outcome. The firm did not earn more money and did not save tax. It gained the ability to tell a real month from a calendar artifact, which is worth something specifically because it feeds every decision made off the monthly numbers.

Another firm running the same correction might find a genuinely volatile business underneath. The exercise reveals what is there; it does not improve it.

Frequently Asked Questions

What is a payroll accrual and do I need one?

A payroll accrual records labor cost in the period the work was performed rather than the period the pay date falls in, then reverses in the next period. Whether you need one depends on your basis of accounting and how much the timing distorts your monthly view. A cash-basis firm with a consistent short lag may reasonably skip it; a firm making decisions off monthly margin usually should not.

Does fixing this change my taxes?

Generally not on its own. Reallocating cost between months inside a year does not change annual totals, and this firm's deposits and filings were already correct. Changing your actual method of accounting is a separate action with real tax consequences and specific procedures, so talk to your accountant before altering anything beyond internal management reporting.

Why does a biweekly payroll cause this and a semi-monthly one not?

A semi-monthly payroll has 24 runs a year, exactly two per month, so the count never varies. Biweekly has 26, which means two months a year carry an extra run. Semi-monthly still has a cutoff question if the pay date sits outside the period worked, but it does not have the extra-run problem on top of it.

How do I tell if this is happening to my books right now?

Pull twelve months of payroll expense and count the pay runs in each month. If some months show three and others show two, and your margin line moves in the same pattern, you have found it. It takes about ten minutes and requires no accounting judgment at all.

If your margin moves and your business does not, count your pay runs by month before you go looking for a harder explanation. You can browse accountants and fractional CFOs on Sam's List who work with service businesses.

---

About the author: Kimberly Green is the cofounder of Sam's List, where business owners and high earners find vetted CPAs, financial advisors, and fractional CFOs. She's met one-on-one with 400+ financial professionals and writes from the real data behind thousands of client-advisor matches. Ask her anything about finding an accountant - she's heard it all, including the questions people are afraid to ask.