Stack it · Sizing

How to size your funding gap before you borrow

How to size a business funding gap in NZ: map the goal's full cost, plot weekly cash in and out, subtract the pieces you control and find the true low point.

Updated 3 October 2026 · Alternative Business Loans Online editorial team

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Quick answer

To size a funding gap, list the goal's full cost including GST and running costs during the ramp-up, then build a weekly or monthly cash flow forecast showing money in and out. Subtract the pieces you control — supplier terms, deposits, own cash, asset sales. The lowest cumulative point on the forecast, plus a sensible buffer, is the real gap any finance should cover.

Key points

  • The funding gap is the lowest point in your cash forecast, not the price of the goal.
  • Include GST, provisional tax and the ramp-up period in the forecast.
  • Use pessimistic, realistic and optimistic scenarios.
  • Add a buffer, but don't borrow for comfort.
Gap
Lowest cumulative cash point + buffer
Forecast detail
Weekly for short goals, monthly for long ones
Scenarios
Pessimistic, realistic, optimistic

The most common funding mistake isn’t choosing the wrong lender. It’s borrowing the wrong amount. Owners ask for the price of the goal — the machine, the fit-out, the stock order — when the real need is usually smaller, sometimes larger, and almost always shaped differently. Sizing the gap properly is the step that makes every other piece of the stack work.

Why isn’t the price of the goal the right number?

Three reasons:

  1. Some of it is already covered. Supplier terms, customer deposits, a trade-in and your own cash all carry part of the cost before any finance arrives.
  2. Money comes back in during the project. A stock order starts selling; a contract pays progress claims; a new hire starts producing. The need peaks and then falls.
  3. There are costs that aren’t on the quote. GST, freight, consents, wages during the ramp-up, a slow first month.

The real gap is where all of those meet: the lowest point your bank balance would reach if you went ahead with no finance at all.

How do you build the forecast?

business.govt.nz describes a cash flow forecast as an estimate of how much money is coming in and going out of your business for any given period in the future, and recommends daily or weekly forecasting to stay on top of day-to-day cash. For sizing a funding gap:

  1. Pick the timeframe. Weekly for goals that play out over a few months (a contract, a stock build); monthly for longer goals (a second site, an acquisition). Run it until the goal is paying for itself — usually at least 12 months.
  2. Start with today’s bank balance.
  3. List money in: normal sales, plus extra sales from the goal, timed by when customers actually pay.
  4. List money out: normal costs, plus every cost of the goal, timed by when you actually pay.
  5. Add the tax dates: GST returns due on the 28th of the month after each period (with the 7 May and 15 January exceptions), provisional tax instalments, PAYE and employer deductions.
  6. Calculate the running balance each week or month.

Where does the gap show up?

Illustrative only — a business funding a $120,000 project over six months:

MonthOpening balanceMoney inMoney outClosing balance
1$30,000$85,000$140,000–$25,000
2–$25,000$90,000$125,000–$60,000
3–$60,000$105,000$110,000–$65,000
4–$65,000$120,000$100,000–$45,000
5–$45,000$125,000$98,000–$18,000
6–$18,000$128,000$97,000$13,000

The project costs $120,000, but the lowest point is –$65,000 in month three. Add a buffer — say $15,000 — and the funding gap is about $80,000, recovering within six months. That’s a very different request from “$120,000 over five years”.

How do the pieces you control change the gap?

Now layer in the non-loan pieces and re-run the forecast:

Each one lifts the low point. The funding remixer gives a quick percentage version of this; the forecast gives the precise answer.

How do you handle uncertainty?

business.govt.nz recommends three scenarios — pessimistic, realistic and optimistic — and warns against over-optimism. For sizing a gap:

  • Fund the pessimistic case, or at least make sure you could survive it with a buffer facility.
  • Delay receipts, not costs. In the pessimistic case, customers pay later and sales arrive slower; costs arrive on time.
  • Check the shape. If the pessimistic gap never recovers, the goal may not be viable as planned.

If you’d like a real person to look over your gap once you’ve sized it, start a short enquiry.

What should the gap be funded with?

Once you know the size and shape:

  • A short, recovering gap (like the example above) suits a line of credit or short facility.
  • A gap tied to an asset suits equipment or asset finance.
  • A gap tied to invoices suits invoice funding.
  • A deep, slow-recovering gap suits a term loan, property-secured funding or equity.

See ordering your funding sources for the sequence, and test the repayments with the repayment load test.

What do owners usually leave out?

  • GST on purchases (paid up front, claimed back later) and GST on deposits (due when received).
  • Provisional tax in a growth year.
  • Holiday pay, KiwiSaver employer contributions and ACC levies for new staff — see the hiring remix.
  • Existing loan repayments.
  • The owner’s own drawings.
  • A realistic delay between finishing work and getting paid.

Why does a sized gap make lenders more comfortable?

A forecast showing exactly how much is needed, when, and how it’s repaid answers most of a lender’s questions before they’re asked. business.govt.nz lists a cash flow forecast among the documents lenders expect. Pair it with a one-page funding plan and the conversation starts in a much better place.

Ready to fund the gap you’ve measured?

When you know the size and shape of the gap, tell us about it — the goal, the low point and when it recovers. There’s no credit check to start, your enquiry stays with a real person rather than going to a crowd of lenders, and we’ll talk through the right piece. Please share your forecast figures as accurately as you can; it’s the fastest route to the right answer.

Frequently asked questions

How do I work out how much funding my business needs?

Build a cash flow forecast that includes the goal, then find the lowest point the bank balance would reach. That low point, plus a buffer, is your funding need — often less than the goal's total cost.

Should I borrow more than I need, just in case?

A modest buffer is sensible, but borrowing well beyond the gap means paying for money you don't use and carrying larger repayments. A line of credit can provide a buffer without a large lump sum.

How far ahead should my forecast go?

At least until the goal is paying for itself, and usually 12 months. Inland Revenue asks business customers seeking help with tax debt for a twelve-month cash flow forecast, which is a useful benchmark.

What do people forget in a cash flow forecast?

GST payments, provisional tax instalments, holiday pay, ACC levies, loan repayments, seasonal dips and the time customers actually take to pay.

Got a goal? Let's mix the money for it.

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