The Weekly Cash Number to Watch
Why this matters
Profit is a monthly story. Cash is a weekly one. A shop dies from running out of cash, not from a bad profit-and-loss statement, and cash can vanish in days while the monthly numbers still look fine. If you check one financial thing every week, make it your cash position and what is coming at it. Five minutes on a Friday catches the problem while you still have options. The owners who do this almost never get surprised.
The one number: cash on hand versus near-term obligations
The number to watch is not just your bank balance. A balance alone lies, because some of it is already spoken for. The real number is your net near-term cash: cash you can actually use after subtracting what you must pay in the next short stretch.
Work it like this:
- Start with cash in the bank that is truly available.
- Subtract any customer deposits you are holding (that money is committed to the work it pays for).
- Subtract the bills, payroll, and taxes due before your next reliable wave of collections.
What is left is your true working cash. If it is comfortably positive, you have room. If it is thin or negative, you have a problem the bank balance was hiding.
Cash runway: how many weeks could you survive?
Once you know your true working cash, the next instinct to build is runway: how long you could keep the lights on if collections stopped tomorrow. Divide your available cash by your typical weekly cash burn (payroll plus fixed bills plus normal operating spend).
The result is a number of weeks. There is no single correct target, but the intuition is simple:
- A runway measured in many weeks means a slow month or a late-paying customer will not sink you.
- A runway of only a week or two means you are one bounced deposit or one slow Friday from missing payroll.
A shop that knows its runway makes calmer decisions. A shop that does not is gambling every week without knowing the stakes.
What to look at each week
Keep the Friday review to a short, fixed checklist so it actually happens:
- Available cash now. The real, after-deposits number, not the raw balance.
- Money coming in soon. Invoices you genuinely expect to collect in the next week or two. Be honest, not hopeful.
- Money going out soon. Payroll, rent, loan payments, supplier bills, and any tax due.
- The gap. In minus out. A widening negative gap two weeks running is your early warning.
- Oldest unpaid invoices. A quick glance at what is aging, so collections do not slip.
That is the whole review. Five lines, every week, same day.
Reading the trend, not just the snapshot
A single week's cash number means little on its own. The signal is in the direction.
- Cash drifting up week over week: the business is converting work into money faster than it spends. Healthy.
- Cash flat while you are busy: the work is happening but not turning into collected cash. Check whether you are billing promptly and collecting on time.
- Cash drifting down for several weeks with no one-time cause: this is the pattern to catch. It means you are spending faster than you collect, and the monthly statements will not show it clearly for weeks.
Watch the slope. The slope tells you where you are headed; the snapshot only tells you where you are.
Habits that keep the number honest
- Bill the day the work is done, not at month-end. Cash you have not invoiced cannot arrive. Slow billing is the most common reason a busy shop stays cash-poor.
- Stagger your big outflows so payroll and a large supplier bill do not land in the same lean week.
- Keep a cash cushion sized to your runway target, and treat dipping into it as a signal, not a routine.
- Do not let deposits feel like spare cash. Hold them mentally against the jobs they fund.
The weekly cash number is the cheapest insurance a shop owner can buy. It costs five minutes and buys you the time to act before a shortfall becomes a crisis.
References
- SBA cash-flow management guidance for small businesses
- Standard practice on short-term cash forecasting and runway
- See related: Reading a Cash-Flow Statement: The Basics
- See related: Financial Warning Signs on the Monthly Statements