Academy / Lessons / Year-end and compliance / EP37
How many months of cash have you got left? Budgets, forecasts and the age of the cheque in the drawer
Runway equals cash divided by monthly burn. A boss should know that number by heart. A budget is the map and a forecast is the headlights — ignore both and you are driving with your eyes shut.
This is the text version of a Mandarin video lesson — watch the original on the 中文 page. The script is written out in full below.
01Key points
- Runway equals cash divided by monthly burn — a number a boss should know by heart
- Three ways of driving: by the map (budget) · by direction · by the headlights (forecast)
- The modern version of the cheque in the drawer: the payment is prepared by the maker and the approver never approves
- The symptom is not being able to see ahead; the price is your suppliers' trust and your credit terms
- Hang the budget on the accounts: hold the fixed down · control the variable proportionally · work out the jump in a step cost
- Leave a contingency line and draw a runway red line
02Text version
Hook
Boss, three questions, and see whether you dare answer. One, does your company have an annual budget? Two, can you estimate next month's receipts and payments? Three, the harshest one — how many months can the company burn on the cash in the account? Nine bosses out of ten cannot answer the third. Today: budgets, forecasts, and the lifeline called runway.
Three ways of driving
Managing money in a business really comes down to three ways of driving. By the map — an annual budget, compared monthly: where you went over and where you saved. By direction — no detailed budget, but a forecast: roughly what comes in and goes out next month. By the headlights — you can see as far as next week, or at best the end of the month, and past what the lights reach it is pitch black. Most SMEs are the third. It is not that they do not want to look further, it is that the books are not current (the thirtieth lesson), so there is nothing to look at. And that number: runway — the cash in hand divided by the net monthly burn, equalling how many months you can survive. A boss should be able to state it at any time.
The age of the cheque in the drawer
Two scenes I have seen often over my years in accounting. The old days — the cheque is written and kept in the drawer, too risky to hand over to the supplier; or it is handed over with a word of instruction: "call me before you bank it in." Why? For fear the account goes through the floor the moment it is presented. The new days — the game has upgraded: in the system the maker prepares the payment and screenshots it to the supplier, "look, I have made the payment" — while the approver takes his time approving. The document is real and the payment is half a payment. The same stalling tactic in digital clothes. I am not saying this to laugh at anyone — everybody has seen it, and so have I. But the truth has to be said: these tactics are the symptom, and the disease is not being able to see the road ahead, so you squeeze the cash out one day at a time. And the price is not small: your suppliers' trust and your credit terms (the sixth lesson) get spent, a little at a time.
How to set a budget: hang it on the classifications
The cure is a budget — but a budget is not a total number pulled out of the air, it is tracked by category. The chart of accounts from the fourth lesson comes on stage again here: a budget hung on the classifications is a budget you can track. When classifying, know the three temperaments of cost. Fixed costs — rent, salaries, instalments: they burn whether or not you open (the eleventh lesson), and they are the denominator of your runway, so watch them like a hawk. Variable costs — purchases, commission, freight: they follow turnover, so control them proportionally. Step costs — the ones most often overlooked: one more employee, one more vehicle, one more outlet, and the cost does not creep up, it jumps a level. The "do I take the big order" question from the twentieth lesson is really about whether you can survive that jump. And one category to keep separate: non-operating items — interest, one-offs, foreign exchange. Do not let them into the operating picture, or you cannot see whether the business itself is making money.
Prepared for the unprepared
One last thing: contingency. A vehicle will break down, equipment will refuse to start, a customer will go under, a summons will arrive. What surprises have in common is that they will certainly come; you just do not know when. So a budget needs a contingency line: a buffer set aside. And set a floor for your runway — below a certain number of months, a red light comes on. In a line: prepared for the unprepared. Preparing is for the day you were not prepared.
To close
Between "a cheque in the drawer" and "driving by the map" sits a living budget and a forecast rolled forward every month (the thirteenth lesson). That is exactly what LTT is built on — business analytics and financial reporting (the seventh lesson): setting your budget up and putting your runway on the screen. Want to know how many months your runway is? Grab a coffee first and talk about your business. For the accounting, come to LTT. I am LTT, helping SME bosses get their accounts straight. Follow us, and see you next time.
03Common questions
How do I calculate runway accurately?
Divide the cash you can actually use by the average net outflow of the last three months, and do not use profit. Profit contains money not yet collected; runway only counts what is genuinely in the account.
What is the difference between a budget and a forecast?
The budget is the map drawn at the start of the year and largely does not move; the forecast is the headlights, redrawn every month on the latest information. You need both, for different purposes.
What does a step cost mean?
One more employee, one more vehicle, one more outlet — the cost does not climb gradually, it jumps a level. That jump has to be built into the budget, or one step over and it blows up.
Grab a coffee with us and talk about your business — leave the accounts to LTT. Write to ltt@lttcfo.com · WhatsApp 011-1955 5538
04Comments
Verified as at 2026-08-28 · Evergreen lesson — no year-specific tax figures.
