Restaurant Cash Flow: The 13-Week Forecast and Budgeting for South Florida's Slow Season

Most restaurants that close were profitable on paper in their final year. What killed them was a payroll Friday that landed two days before the card settlements did, in the second month of the slow season, with the sales tax payment already spent. Cash flow is a timing problem, and timing problems are solved with a forecast — specifically, a rolling 13-week one.

Key takeaways

• The 13-week cash forecast is the single most useful financial document a restaurant can maintain: every expected inflow and outflow, week by week, one quarter ahead.
• South Florida seasonality is inverted from most of the country: winter is peak, late summer through hurricane season is the trough. A concept doing $120K/month in February may do $65K in September — plan for it in March, not August.
• Sales tax collected and payroll taxes withheld are not working capital. Borrowing from them converts a cash problem into a personal-liability problem.
• Fixed obligations don't shrink with sales. Know your weekly "nut" — the amount that goes out no matter what — and how many slow weeks your cash covers.
• Arrange credit before you need it. A line of credit negotiated in season costs less than merchant cash advances taken in desperation.

Building the 13-week forecast

Start with the cash balance today. Then, for each of the next 13 weeks:

Inflows. Project sales from last year's same weeks adjusted for this year's trend, then convert to cash timing: cash and same-week card settlements, third-party delivery deposits on their actual schedules (each platform pays differently, net of commissions), catering deposits and balances when contracts say they arrive — not when events happen.

Outflows, on their real dates. Payroll on pay dates (with the seasonal staffing plan baked in), payroll tax deposits on their schedule, rent on the 1st, sales tax by the Florida due date (the 1st, late after the 20th, of the following month), vendor payments on actual terms — food weekly, liquor per Florida's payment rules, linen and services on their cycles — loan payments, insurance installments (South Florida property premiums are big and often quarterly or annual — spread them into the forecast as reserves so they never surprise you), and a line for repairs, because something breaks every quarter.

The output is a projected cash balance for each Friday for 13 weeks. Any week that goes negative is a problem you now get to solve eight weeks early — move a big vendor payment, shift an owner draw, time the insurance payment — instead of on the morning it happens. Update it weekly in 20 minutes: replace last week's projection with actuals, add week 14.

The South Florida seasonal curve

Tourist-driven and snowbird-driven markets run hot from roughly November through April and soft from July through September, with hurricane season adding real interruption risk on top. The planning consequences:

Bank the season deliberately. Set a fixed percentage of peak-months sales — many operators use 3–5% — that moves to a separate reserve account weekly during season. The target: enough to cover the gap between trough-month revenue and your fixed nut for the full slow stretch. If your fixed weekly obligations are $18,000 and September sales support only $13,000 of them, ten soft weeks means a $50,000 reserve just to tread water. Compute your version of that number; it's the most important budget figure you'll produce all year.

Build two staffing models, not one. A peak roster and a trough roster, with the transition dates planned in advance and communicated to staff. Cutting hours reactively in mid-August, after three bad weeks, saves half as much as planning the ramp-down in June — and costs you your best people, who leave for whoever planned better.

Time the big spends into season. Equipment purchases, renovations, and menu launches belong in October–November (cash arriving, season ahead), not April (cash about to fall). Same logic for annual prepayments and owner distributions.

Hurricane contingency is a cash line, not just an insurance line. Deductibles on named-storm coverage are typically percentage-based, business-interruption claims pay slowly, and a week of closure kills a week of revenue while payroll decisions still have to be made. The reserve account is the real first responder.

The two accounts you never borrow from

Sales tax. In Florida you collect 6%-plus-surtax on nearly every dollar of food and beverage sales. It sits in your bank account looking like yours for up to seven weeks. It isn't. The state is aggressive with restaurants precisely because this borrowing is common, and repeated late remittance escalates from penalties toward personal exposure and, in willful cases, criminal referral. Cleanest fix: sweep the tax portion of each day's sales to a separate account automatically.

Payroll withholding. Federal income tax and FICA withheld from staff paychecks are trust funds. If the business fails owing them, IRC §6672 makes the responsible people — owners, and sometimes managers and bookkeepers who chose which bills to pay — personally liable for the trust-fund portion. Bankruptcy doesn't discharge it. A restaurant funding operations out of unpaid 941 deposits isn't managing cash flow; it's transferring the business's debts onto its owner.

If the forecast says you can't cover both taxes and vendors, the order is taxes first, then a structured conversation with vendors — food suppliers extend terms for operators who call before missing payment far more readily than after.

Financing the gap the cheap way

A seasonal business should carry a bank line of credit sized to its trough, negotiated during peak months when the financials look best, drawn in August and cleared by January. Compare that honestly against the alternatives that find struggling restaurants: merchant cash advances repaid as a daily percentage of card sales routinely carry effective annual costs of 50–150% and compound the exact seasonal problem they're sold to solve. Vendor terms are the other underused lever — moving your two biggest suppliers from 7-day to 21-day terms is a permanent, interest-free working-capital injection.

Official sources

• IRS — Employment tax deposit requirements: https://www.irs.gov/businesses/small-businesses-self-employed/depositing-and-reporting-employment-taxes
• IRS — Trust fund recovery penalty: https://www.irs.gov/businesses/small-businesses-self-employed/trust-fund-recovery-penalty
• Florida DOR — Sales tax filing and payment deadlines: https://floridarevenue.com/taxes/taxesfees/Pages/sales_tax.aspx

Practitioner note: The forecast's value isn't precision — week 11 will be wrong. Its value is that the decisions (when to cut hours, when to draw the line, when to call the landlord) get made with eight weeks of runway instead of two days. Restaurants with mediocre margins and a live 13-week forecast outlast restaurants with good margins and none.

Fairlight builds and maintains 13-week forecasts as part of restaurant CFO advisory across South Florida — seasonality modeling, reserve targets, and lender-ready packages included. Contact us or see pricing.