Most business plans do not fail on the strategy page. They fail on the page with the numbers.
Not because the founder cannot add up. Because the plan answers "will this be profitable" while the business dies of something else entirely: running out of cash in a month it was profitable.
Xero looked at more than 200,000 small businesses across New Zealand, Australia and the UK. In New Zealand, 95% had at least one month of negative cash flow in the year, the highest of the three countries. The average small business here was cash flow negative for four months of it. One in six spent more than half the year that way.
That is not a worst case. That is the normal operating condition of a New Zealand small business.
Two things make it bite harder than the plan suggests.
You get paid late. NZ small businesses were paid an average of 4.5 days late last quarter. That is the best result of any country Xero measures, and it is still money arriving after you needed it.
There is nobody to absorb it. 97% of New Zealand businesses have fewer than 20 employees. No treasury function, no credit line arranged in advance, nobody whose job is to notice the gap coming in March.
So a budget that only shows profit is not a budget. It is a hope with a spreadsheet around it.
A working budget shows five things:
What you spend before you earn anything, and for how many months.
The point where revenue covers costs, expressed in customers rather than dollars, because customers are the thing you can count.
When cash actually lands, not when the invoice goes out.
What happens if it lands 30 days later than that.
What you fund the gap with, decided before you need it.
None of that is complicated. It is uncomfortable, which is why it gets skipped in favour of the marketing section.
Build the plan and the budget as one document. A plan the numbers do not support is not a plan. It is a pitch.
Sources and notes
Sources:
Cash flow months: Xero Small Business Insights special report, "Crunch: cash flow challenges facing small businesses" (July 2022), drawing on more than 200,000 small businesses across NZ, Australia and the UK, using 2021 data. New Zealand: 95% had at least one negative cash flow month, 4.0 months negative on average, 17% negative for more than six months.
Late payment: Xero Small Business Insights, New Zealand, December 2025 quarter. NZ 4.5 days late, Australia 6.0, UK 8.3, US 8.5, Canada 11.3.
Business size: Stats NZ Business Demography Statistics. 97% of New Zealand's businesses have fewer than 20 employees.
Two caveats worth stating: the Xero figures cover businesses using Xero, which skews towards those already running proper accounting, so the real picture across all small businesses is unlikely to be better. And the crunch report is 2021 data, so treat the shape as current and the exact number as a few years old.
If your plan and your budget are separate documents, that is usually the first thing worth fixing: futureshiftadvisory.nz/services/entrepreneur