Most stores do not die because demand was weak. They die in month two because the owner ran out of cash. The cure is boring but decisive: raise enough one-time capital and a cash reserve that covers operating costs while revenue ramps. Here is the formula, with real ranges.
Why stores run out of cash in month two
A lease is signed, build-out is paid, inventory is stocked — and then sales come in slower than the model assumed. Rent, wages, and utilities keep coming whether or not customers do. Without a reserve, the first slow month is the last month. The fix is to fund the slow start before you open.
The two-part reserve formula
Your true opening capital is the sum of two pools:
| Pool | What it covers | Typical range (verified 2026-08-13) |
|---|---|---|
| One-time costs | Build-out, first inventory, equipment, licenses, signage, contingency | Boutique/retail $30K-$150K; coffee/cafe $80K-$300K; QSR $150K-$500K; full-service restaurant $300K-$750K+ |
| Operating reserve | 3-6 months of rent+NNN, wages, utilities, owner draw, other | ≈ 3-6 × your monthly fixed cost |
Monthly operating costs you must cover
| Line | What to include |
|---|---|
| Rent + NNN | Base rent plus CAM, insurance, and property tax |
| Utilities | Power, water, internet, phone, trash |
| Wages + employer tax | Gross wages plus FICA 7.65% + SUTA/FUTA/workers' comp (often +15-25% on payroll) |
| Owner draw | The wage you must pay yourself to live |
| Other | Software, marketing, supplies, maintenance, payment fees |
The reserve math
Take your realistic monthly fixed cost and multiply by your reserve months. A cafe with $18,000/month fixed cost and a 4-month reserve needs $72,000 in reserve on top of its build-out and inventory. Skipping this is the single most common fatal error.
Put it to work
Use the free calculators below to size both pools from your own numbers, then stress-test a conservative ramp before you commit savings or a lease.