When preparing to open a restaurant, starting with projected sales for the trade area can make it easy to underestimate the costs the location must cover each month. Before signing a lease, first confirm the fixed costs that must be paid regardless of whether sales are generated. Then add variable costs to calculate the break-even point and minimum required sales. This should be followed by a cash flow review that reflects not only accounting profit and loss but also loan principal repayments and timing gaps in cash inflows.
Confirm the Full List of Fixed Costs First
Fixed costs are expenses paid at scheduled times even when there are no sales or sales fall short of expectations. Reviewing rent alone is not enough. Costs should be separated by category, including common-area or building management fees, labor costs for the core staff required regardless of sales, loan interest, royalties, telecommunications, recurring subscriptions for security, pest control, accounting, and ordering systems, and maintenance costs for essential equipment.
In Successful Strategies for Starting a Restaurant Business (외식업 창업 성공전략), author Kang Jong-heon explains that the break-even point should begin with the cost structure, not a sales target. Omitted costs do not disappear; they emerge as cash pressure during operations. Calculating fixed costs is therefore less about optimistic estimates and more about confirming amounts based on lease agreements, quotations, work schedules, and financing repayment terms.
Labor costs should not be classified entirely as either fixed or variable. Wages and employer-paid amounts for the core kitchen and service staff required to open the restaurant, regardless of sales, should be included in fixed costs. Additional staffing costs that can be adjusted according to weekends, peak seasons, or higher order volume are more realistically managed as separate variable or semi-variable items.
Break Monthly Costs Down by Day and Hour
After calculating monthly fixed costs, divide them by the actual number of operating days in the month—not the number of calendar days—to determine the daily fixed-cost burden. Dividing this amount again by average daily operating hours shows the minimum hourly burden. If regular closing days, half-day operations, or reduced off-season hours are not excluded, the daily and hourly burden will appear lower than it actually is.
However, this amount is not itself the sales target. It excludes variable costs that rise with sales, such as ingredients, packaging, card payment processing fees, and delivery-related expenses. Minimum required sales can be reviewed by dividing monthly fixed costs by the contribution margin ratio—the share of sales remaining after variable costs. If costs and sales channels differ by menu item, do not apply a single average cost ratio. Reflect the actual mix of dine-in, takeout, and delivery sales.
Test Sales Targets Against Order Capacity
Convert the calculated monthly break-even sales into minimum required daily sales by dividing them by the actual number of operating days. Dividing that figure by the average transaction value provides the required number of daily orders or customers. Applying the number of seats, feasible table turnover, takeout and delivery capacity, cooking times, and peak-hour staffing shows whether the target is physically achievable.
If reaching the required customer count would demand a table turnover rate the seating capacity cannot support, or an average transaction value that is difficult to achieve in the trade area, the problem cannot be solved simply by increasing projected sales on paper. The store size, lease terms, menu pricing, operating hours, or staffing structure must be redesigned.
Review the Income Statement and Cash Flow Statement Separately
When reviewing financing costs, distinguish between interest and principal repayments. Loan principal repayments may be treated differently from expenses for accounting purposes, but they still reduce the cash available each month. The break-even calculation should therefore include interest expense under the applicable accounting basis, while the monthly cash flow statement should show interest, principal repayments, the repayment start date, and any grace period.
Card and delivery sales may be settled after the actual sale date, while rent, payroll, and ingredient invoices are paid on their agreed dates. Prepaid advertising and maintenance costs, as well as inventory purchased in bulk, also tie up cash in advance. Even if the business is expected to show an accounting profit, the available balance may be insufficient on specific payment dates. Review the timing of both cash inflows and outflows, not only monthly totals.
Calculate How Long Working Capital Can Sustain Operations
Avoid assuming that projected sales will be achieved immediately after opening. Calculate monthly cash shortfalls under separate scenarios in which sales remain below plan or take longer to build. Then determine how many months the available working capital can cover fixed costs and essential variable costs. The limit for additional funding and the timing of cost adjustments should also be established before signing the lease.
- Fixed-cost schedule: Record rent, core staffing costs, management fees, financing costs, and recurring contract expenses together with their payment dates.
- Income statement: Apply variable-cost ratios by sales channel to calculate the break-even point and minimum required daily sales.
- Cash flow statement: Include loan principal, inventory purchases, prepaid expenses, and settlement delays for sales proceeds.
- Working capital schedule: Determine when funds will be depleted if sales fall short and set a limit for additional funding.
When comparing potential locations, do not look only at whether the rent is high or low. Evaluate the total fixed-cost structure, including the core staffing required by a larger store, mandatory long operating hours, maintenance costs for aging equipment, the number of seats that can actually be used, and feasible table turnover. Projected sales must be validated, but fixed costs become real as soon as the contract is signed. First establish a cost structure the business can sustain, and then verify whether achievable sales can exceed it. Following this sequence reduces the risk of signing a store lease.