How Much Money You Actually Need (The Honest Calculation)

The first time we sat down to calculate how much money we needed to start a company, we produced a number. The number was based on our fixed monthly costs, an estimate of when revenue would arrive, and a buffer for the period before it did. The number felt reasonable. We were about forty percent short of what we actually needed.

We were not reckless. We modeled it carefully. We were wrong in the same direction that most people are wrong, and understanding why requires looking at what the optimistic calculation leaves out.

What the optimistic calculation includes

Fixed monthly costs are easy to enumerate: rent, software subscriptions, payroll if there is any, insurance, accounting and legal retainers, and debt service if there is debt. These are real and the optimistic calculation gets them right.

Revenue projections are where it starts to go wrong. The optimistic projection assumes a ramp that is based on what the business could achieve, not what it is likely to achieve given the friction of starting. The first client takes longer to close than expected. The second referral does not come as quickly as planned. The project that was supposed to start in month two gets delayed to month four. These are not unusual outcomes. They are the normal outcomes for a new business, and a projection that does not account for them is not a projection. It is a hope.

What the honest calculation includes

Owner replacement cost is the number most people omit and the one that causes the most pain. If you are starting a business full-time and not paying yourself a salary, you are funding the business with your labor at market rate, whether or not you account for it. If you would earn $120,000 per year as an employee, then working for equity in a company that does not pay you is costing you $10,000 per month. That cost is real even if it does not appear on the company's books. We are telling you to put it in the calculation, because the calculation without it is how you end up forty percent short.

This matters for the capital calculation because the question is not just "how long can the business survive on this capital" but "how long can you survive while the business needs this capital." Those are different numbers, and the second one is often lower.

Tax obligations arrive on a schedule that does not care about your cash timing. Quarterly estimated taxes, payroll taxes, state franchise taxes, and the year-end tax bill all require cash at specific dates. A business that is profitable on an accrual basis can still face cash flow problems if it has not reserved for taxes. We did not reserve adequately in our first year. The bill in April was larger than we had built into our operating budget, because we had not treated taxes as a cash obligation in the same way we treated rent.

Reserve for the slow quarter. Every business has slow quarters, and a new business has no history to tell you when they will come. The capital calculation that assumes continuous performance at the projected ramp has no buffer for the month where a client pays late, the contract that delays, or the pipeline that stalls. Eighteen months of comfortable runway, with no reserve, leaves you in a crisis the first time anything goes slightly wrong.

The number to target

The formula we use now: calculate your honest monthly operating costs including a reasonable owner salary (even if you are not paying it, calculate it to understand the full cost). Project revenue at two-thirds of what you think is likely, because early stage projections are reliably optimistic. Identify the month where cash flow becomes positive at that conservative revenue level. Add three months of full operating costs as reserve. That is your number.

It will be larger than the number you calculated the first time. It should be.

What to do when you cannot raise the honest number

Start smaller. Not smaller in ambition, smaller in scope. A business that can reach cash-flow positive on $50,000 is a better foundation than a business that requires $200,000 and has $120,000. The constraints of building lean are real and they are also survivable. The consequences of running out of capital before you reach cash-flow positive are not always survivable.

The business that exists on the other side of a period of controlled, well-capitalized growth is a different thing from the business that scraped through underfunded and got lucky. The second kind looks the same from the outside. It is not the same from the inside, and it is not the same when something goes wrong.

We were forty percent short. The business survived because the revenue ramp happened faster than the conservative model, not because we had planned for it. We have not relied on that kind of luck since.