Working capital math
for restaurants.

Most restaurant owners we work with can tell you their food cost percentage and their labor percentage to the tenth of a point. Fewer can tell you, on any given Wednesday, how much cash they have on hand against how much is going out by Friday close. The first number is accounting. The second number is operations. The second number is what determines whether the business survives a slow month.

The five flows

A restaurant's cash position at any moment is the result of five overlapping flows. Understanding the cadence of each is the entire game.

Sales velocity is the inflow side. For a full-service restaurant doing $1.2 million a year, average daily revenue is roughly $3,300. But that average hides a weekly pattern: weekends typically generate 35-45% of weekly revenue, Monday and Tuesday generate the least. A restaurant grossing $25,000 in a strong week might bring in $3,000 on Tuesday, $3,500 on Wednesday, $4,000 Thursday, $6,500 Friday, $5,500 Saturday, and $2,500 Sunday. The weekly cash flow planning has to be done against this distribution, not against the smoothed average.

Processor settlement is the inflow timing layer. Modern card processors — Toast, Square, Stripe, Heartland — settle credit card batches to the operating account on a T+1 or T+2 basis. A Friday night's card sales typically land in the bank account the following Monday or Tuesday. Cash sales (and the cash tips paid out same-night to staff) hit the operating account on whatever schedule the owner chooses to deposit them, which in practice is often weekly. The cash position on Monday morning reflects most of last week's card sales plus whatever cash you banked Friday, minus the four to five days of outflows that already ran.

Payroll is usually the single largest weekly outflow. Most restaurants run weekly payroll for hourly staff, which lands on Thursday or Friday for the preceding week's hours. For a restaurant with twenty employees averaging $20/hour with a mix of full-time and part-time, weekly gross payroll often runs $12,000 to $20,000. Adding payroll taxes and any benefit contributions, the total weekly payroll outflow can easily approach $25,000 for a mid-sized operation. That outflow needs to be funded against the prior week's settled card deposits.

Cost of goods is the next major outflow. Food and beverage costs for a full-service restaurant typically run 28-34% of revenue. Vendor invoices arrive on the schedule of deliveries, usually two to three times per week from the main food distributor, with smaller deliveries from produce, dairy, seafood, and liquor vendors. Net 7 terms are common with food distributors; net 30 is rarer but possible for established accounts. Liquor often runs cash-on-delivery due to state alcohol distribution laws. The cash effect: a restaurant doing $40,000 a month in COGS on net 7 terms is carrying roughly $9,000 to $13,000 of vendor float at any given moment.

Fixed monthly costs — rent, insurance, utilities, debt service, marketing, accounting, royalties if franchised — land on calendar cadence rather than operational cadence. Rent is almost always due the first of the month. Utilities arrive monthly. Insurance is monthly or quarterly. These outflows are predictable but they don't respond to operational rhythm: the lease is due whether last week was strong or weak.

A sample restaurant P&L and what it hides

Consider a mid-sized full-service restaurant doing $1.5 million annually with a typical cost structure. The P&L might look like this:

Revenue: $1,500,000. Cost of goods sold at 32%: $480,000. Labor at 30% including payroll taxes and benefits: $450,000. Rent: $120,000. Utilities, insurance, marketing, repairs, accounting, and other operating costs: $200,000. That leaves EBITDA of roughly $250,000, or about 17% — a healthy margin for a full-service restaurant. Out of EBITDA, debt service on prior buildout financing, ownership distributions, and reinvestment have to happen. A clean profitable file.

But the working capital picture inside this P&L is more complicated than the annual numbers suggest. Monthly revenue averages $125,000, but in a slow month it might be $95,000 and in a strong month $155,000. Monthly COGS averages $40,000, monthly labor averages $37,500, and monthly fixed costs average $26,700. Total monthly operating outflow is roughly $104,000. The gross margin buffer between average monthly revenue and average monthly operating cost is $21,000 — call it $700 a day on average.

In a slow month — $95,000 revenue against $104,000 of operating cost — the restaurant burns about $9,000 of cash for the month. Two slow months in a row and the cash position has moved by $18,000. If the operator was running with a $40,000 cash cushion, two slow months has put them at $22,000. Another slow month and payroll starts feeling tight. None of this shows up in the annual P&L as a problem because the slow months are usually offset by strong months elsewhere in the year. But the cash flow timing inside the year is the entire question.

The working capital reserve framework

A reasonable reserve framework for the restaurant above: six to eight weeks of total operating expense held as operating cash. Total weekly operating expense is roughly $24,000 ($104,000 monthly ÷ 4.33 weeks), so six to eight weeks is $144,000 to $192,000.

That number sounds large relative to the size of the business, and most restaurant operators don't actually hold it. The compromise most operators settle on is a smaller cash reserve — often four weeks, or $96,000 in this file — backed by an unused line of credit or a pre-qualified working capital relationship that can be activated within 24 to 48 hours. The combined buffer (cash plus available credit) approximates the eight-week reserve without tying up the full amount in idle cash.

The point isn't the specific number. The point is that operators should know their number. The reserve question — "how many weeks of operating expense can I cover from cash and committed credit right now" — is one of the three or four most important numbers an owner should know on any given Monday morning.

When to deploy working capital instead of holding cash

The other half of the math is the deployment decision. Working capital that stays parked in the operating account generates roughly nothing — most operators don't get paid meaningful interest on operating cash, even now. The question for any reserve above the safety threshold is whether deploying it (or borrowing additional capital and deploying that) produces enough return to justify the cash flow exposure.

The deployments that almost always pencil for restaurants are revenue-expanding investments with measurable payback. A patio buildout in a market where outdoor seating commands a premium can add 15-25% to weekly revenue during patio season. A second POS station that reduces ticket wait times on a busy Friday can add 8-12% to peak-period throughput. A delivery integration on a high-density urban location can add a measurable percentage to weekly volume. Each of these has measurable payback math: deploy $40,000, expect $X in incremental revenue per month, expect to recover the deployment in N months.

The deployments that often don't pencil are cash burn coverage with no specific recovery plan. Using working capital to make payroll through a slow stretch without a concrete plan to bring revenue back is a path to compounding debt. The math on a typical short-term working capital advance — payback factor of 1.30 to 1.40 over 9 to 14 months — only works when the deployment generates enough incremental cash flow to cover the daily debits. If the underlying revenue isn't there, the capital becomes part of the problem rather than the solution.

A simple decision rule

The decision rule we walk operators through has three steps. First, calculate your true cash reserve — operating cash plus available credit, minus the next two payrolls and the next month's fixed obligations. Second, ask whether the reserve covers four to six weeks of operating expense from today. If yes, you have flexibility. If no, the priority is rebuilding the reserve, not deploying new capital. Third, if you have flexibility and you're considering a deployment, write down the specific revenue lift expected and the timeline to recover the deployment. If the math produces a 6 to 12 month payback with a credible source of incremental revenue, the deployment usually makes sense. If the math produces an 18+ month payback or relies on revenue that isn't already visible, the deployment usually doesn't.

Restaurants are operationally complex businesses with thin margins and relentless weekly cash flow rhythms. The owners who navigate the timing successfully are not the ones with the best P&Ls — they are the ones who understand the timing math underneath the P&L well enough to make capital decisions before the cash problem becomes a survival problem. The working capital question is not "should I get a loan." It's "what is the math of the week, the month, and the season, and what does the math tell me to do." Operators who can answer that question stay open. Operators who can't, often don't.