Side Income
Deposits, retainers and staged payments as cashflow tools
How a fee is structured decides when you get paid, which for small suppliers matters as much as the total.
What follows is the working version of payment structures: the decisions in the order you actually meet them, with the reasoning attached.
Before you start
- A deposit shifts part of the cash risk to the point work begins.
- Staged payments tie money to milestones rather than to completion.
- Retainers trade some rate for predictability of income.
A deposit prices commitment
Asking for part of the fee before work starts covers materials, reserves the time and filters clients who were never going to proceed. It is standard practice in many trades and creative fields and is far more readily accepted than people expect. The size matters less than its existence; even a modest deposit changes the nature of the arrangement.
Refusal to pay any deposit is itself useful information about how the invoice will be treated later.
Stages beat completion
Tying payments to defined milestones means a long project does not concentrate all the cash risk at the end. It also surfaces disagreements about scope early, when they are cheap to resolve. Each stage needs a clear, checkable definition, or the milestone becomes another negotiation.
Writing the stages into the engagement document is what makes the invoices uncontroversial.
Retainers trade rate for certainty
A monthly retainer providing a guaranteed sum for an agreed scope gives predictable income, usually at a lower effective rate than ad hoc work. That trade is often worth making for the portion of income you need to be reliable, and not for all of it.
Put simply, the common failure is scope creep, where the retainer quietly absorbs more work than it was priced for. A stated inclusion list and a defined hours cap prevent it without any awkward conversation later.
Deposits and tax are not the same event
Money received in advance may be taxable when received or when the work is performed, depending on the accounting basis and the country. Sales tax treatment of deposits also differs, and getting it wrong creates a correction later. This is a specific question worth asking an accountant once at the start rather than assuming.
It is also a reason to keep advance payments in the business account rather than treating them as available income.
Cancellation terms carry the risk
Reserved time that is cancelled at short notice is a real loss, because it cannot be resold. A cancellation clause, with a sliding scale by notice given, is normal in sectors that book time in advance.
It only works if the client saw it before booking, which means it belongs in the engagement document. Enforceability of such clauses varies, so keep them proportionate to the actual loss.
None of this is a substitute for talking to a clinician if something feels wrong.
Structure matters most when you are small
A large supplier can absorb a delayed payment; a sole trader with one client cannot. That asymmetry is why payment structure is a survival question for small suppliers and a minor administrative one for their clients.
Asking for it should not require an apology, and framing it as standard practice rather than a special request works better. None of this is a substitute for legal or accounting advice on the specific terms you use.
The takeaway
Decide the payment structure before the work, not after the first late invoice.
The version you keep doing is the version that works.
Questions readers ask
Is asking for a deposit unusual?
It is standard in many trades and creative fields. Framing it as standard practice rather than an exception is how it is most easily accepted.
Should I take a retainer at a lower rate?
Often for part of your income, where predictability has real value. Cap the included scope and hours, or it will absorb more work than it was priced for.
