How to work out what you can afford on marketing
Derive a marketing budget from your own margin and payback period instead of a percentage of revenue rule that has nothing to do with your business.
The budget question usually gets answered backwards
Most owners arrive at a marketing figure by one of three routes. Someone quoted a monthly retainer and that became the budget. A peer mentioned what they spend. Or a percentage of revenue appeared in an article and got adopted. None of the three knows your gross margin or how long your customers take to pay.
Affordability is a calculation with three inputs you already hold: what a customer is worth in gross profit, how long that profit takes to arrive in the bank and how much of it you are willing to invest to win the next one. Everything else is a guess wearing a number.
What sits outside the budget line
A marketing budget is not one number and the exclusions matter more than the headline. Management fees exclude media spend. Platform money is billed to you by Google or Meta directly and it is usually the larger figure. Fees also exclude creative production, photography, website changes, landing page development and any software subscriptions. Service fees attract GST at 18% so build that into the monthly outflow rather than discovering it on the invoice.
Your own time is the cost nobody budgets. Approvals, briefing and answering enquiries sit with you and a campaign that generates enquiries nobody calls back has bought nothing. Published fees for an ongoing managed digital marketing programme sit on the service page so the fee side can be modelled before any discussion while you plan the media budget separately.
When the answer is that you cannot afford any
If gross profit per customer will not cover an acquisition cost at your current conversion rate then no budget is affordable and no agency can change that. Marketing accelerates whatever your unit economics already are. Spending against a negative margin buys losses faster. Fix price, cost or conversion first.
Hold off also if you have no capacity to serve more customers. A practice with a full diary or a workshop at capacity should spend on throughput or on raising prices rather than on demand it will turn away. And if most of your revenue depends on two or three large accounts the money is better spent keeping them. Losing one of those costs more than any campaign would have earned.
A business with no way to record where an enquiry came from should wait a month and install that first. Without attribution the budget cannot be judged and it will be renewed or cancelled on a feeling.
How to calculate the ceiling
Start with gross profit per customer rather than order value. Take the average sale, subtract delivery cost, platform commission, payment charges and any discount. If customers buy repeatedly use the gross profit you can reasonably expect over a defined window such as twelve months and use only orders you have actually observed historically.
Then decide the share of that profit you are prepared to spend to win a customer. That share is your allowable acquisition cost and it is the ceiling every campaign gets measured against. Multiply it by the number of new customers you want each month and you have a media budget. Add the management fee and tax on top.
Now test it against cash rather than profit. Advertising is paid in the month it runs. If your customers settle in sixty days the budget has to be funded for roughly three months before it returns. Put that gap into your cash forecast. A budget that is affordable on the profit and loss statement and unaffordable in week seven is the usual failure.
Which numbers tell you the truth
Payback period is the number that matters. Count the months until gross profit from a cohort of new customers covers what you spent to acquire them. Alongside it track contribution after acquisition cost. Those two decide whether the budget can be increased.
Lead count flatters hardest. So does budget utilisation and anything reported as impressions or reach. A platform figure describing cost per lead says nothing about whether those leads closed. No one can promise a payback period in advance either. Anyone presenting a guaranteed return on a proposed budget is describing an outcome that is not theirs to control.
The common mistake
Setting marketing spend as a fixed percentage of revenue is the common mistake and it is exactly inverted. In a strong quarter the rule releases money you did not need to spend. In a weak quarter it withdraws money at the precise moment demand needs building. The budget therefore amplifies the cycle it was meant to smooth.
The expense shows up twelve months later. Campaigns stopped in a slow quarter lose the audience and the learning they had accumulated and restarting costs more than continuing would have. A budget anchored to margin and payback moves with what the business can sustain rather than with last month's billing.
This guide explains how something works. It is not legal, tax or financial advice, and rules change. Confirm anything regulatory with a qualified professional before you act on it.