Software development agency payment terms set the rules of every project relationship. Here’s what to expect, what to watch for, and exactly how WEDOWEBAPPS structures payment terms so both sides are protected.
Most clients focus on the headline number rather than the total project cost. But understanding software development agency payment terms properly is just as important as understanding what you are paying. Payment terms define the risk each party takes on, the pace of the project, and what happens when things do not go as planned.
A low quote with bad software payment terms can end up costing you far more than a higher quote with clear and fair milestones. Equally, an agency that asks for 100% upfront is taking on no risk at all. This is not a partnership; it is a transaction where you hold none of the leverage.
If you have any questions about how we work, our frequently asked questions about working with us cover everything from timelines to communication. But for now, here is how to read any agency’s proposal properly.
Most agencies use one of the three payment structures when setting software payment terms. Each has different implications for risk, flexibility, and project management.
Most Common
Milestone-Based Billing
Payment is split across defined project phases: discovery, design, development, testing, and launch. You pay as each milestone is completed and approved. This is the most client-friendly structure for larger projects because your risk is spread out and tied to deliverables you can actually evaluate.
Good for Ongoing Work
Retainer / Monthly Billing
A fixed monthly fee that covers an agreed number of hours or deliverables. Common for ongoing development, maintenance contracts, or continuous feature work. Predictable costs on both sides. Works best when the scope of work is relatively stable month-to-month.
Use with Caution
Fixed-Price / Lum-Sum
One quote, one invoice, sometimes split into two payments: deposit + completion. Works for very small or very clearly scoped projects. High risks for both parties on anything complex, agencies pad quotes to compensate for scope uncertainty, and clients lose visibility into what they are paying for.
We use milestone-based billing for all projects over £3,000. This is how our software development agency payment terms work in practice. You only pay for work that has been completed, delivered, and signed off.
Here’s the logic behind our structure:
| Stage | Payment | What it Covers |
|---|---|---|
| Deposit (on contract signing) | 30% | Discovery, requirement gathering, technical planning, and resource allocation |
| Design sign-off | 20% | Wireframes, UI/UX design, prototype review, client approval |
| Development complete | 40% | Core feature build, integrations, internal QA, staging delivery |
| Launch | 10% | Final QA, client UAT, deployment, handover, 30-day post-launch support |
Well, these are just average percentages; all these changes, as per the size of the project, whether it is big or small, simple or complex, all these factors decide the payment terms and conditions.
Why this works for you:
You are never paying for work that has not started. The largest payment, 40%, comes in the middle of the project, when the most intensive development work is underway, not at the end. This keeps everything moving and ensures quick responses to changes.
Want to see this breakdown for your specific project?
Request a proposal with itemised payment terms, and we will put numbers to it.
A 30% deposit is not a way to collect payment, but it is what allows us to commit real resources to your project from day one.
Here is exactly where the money you deposit goes:
If you have ever been frustrated by an agency that took weeks to “kick off” after signing, it is often because no deposit means no commitment to resource allocation. A deposit creates mutual accountability.
Each milestone payment is linked to a defined, reviewable deliverable; this is what makes our software payment terms fair to both sides. Before you pay, you see the work.
Here’s what that looks like in practice:
Design Sign-Off
Before the 20% design payment is due, you receive full design files, Figma or equivalent, a clickable prototype, and a walkthrough call. You have a formal review period, typically 7 days, to request changes. The invoice is only raised once you have approved the design in writing.
Development Complete
The 40% development payment triggers when we deliver access to the staging environment. You can test every feature against the agreed specification. Any bugs or deviations from the spec are fixed before the invoice is issued, not after that.
Launch
The final 10% is due after your user acceptance testing, UAT, period, before we push to your live environment. You pay the final invoice only when you are satisfied that the product is ready. We do not take your site live without the green light from you.
Scope changes are normal. Requirements evolve, stakeholders add features, or technical constraints mean we need to rethink an approach. Here’s how we handle changes without disputes:
Small changes (under 4 hours): We absorb these within the project budget. Minor copy edits, small layout adjustments, or config tweaks do not generate a change request.
Medium changes (4-16 hours): We send a written Change Request (CR) outlining the work, the additional cost, and the impact on the timeline. Work starts only when the CR is approved in writing. The additional cost is invoiced at the next milestone.
Large changes (16+ hours): These are treated as a mini-project with their own milestone structure. We assess the impact on the original timeline, issue a revised schedule, and agree on a new payment plan before proceeding.
| Our Rule: No surprises on the scope cost. If something is going to cost you more, you will know before we build it, not when you receive the invoice. Have more questions about how changes are handled? Browse our frequently asked questions about working with us for more details. |
Yes. We invoice in GBP by default, but we can issue invoices in USA, EUR, CAD, AUD, INR, and AED. If you need a different currency, ask when we issue the quote, and we will confirm availability.
Exchange rates are locked at the time the invoice is issued. We do not adjust invoices retroactively for currency fluctuations. If you are a US or European client on a long project where currency movement is a concern, we can discuss fixed-rate agreements on a case-by-case basis.
We accept bank transfer (SWIFT/BACS), Wise, and Stripe (2.9% card processing fee applies if paying by card).
We include the full software development agency payment terms in every contract before you sign. Here’s a summary of the key points, no small print, no surprises:
| Invoice Payment Window 14 days net |
| Late Payment Fee 2% per month |
| Deposit Refundability Non-refundable after kickoff |
| IP Transfer On the final payment receipt |
| Source Code Ownership Fully yours on completion |
| Pause/Cancel Policy Written notice, 14-day window |
| Dispute Resolution Mediation first, UK courts |
| Currencies Accepted GBP, USD, EUR + more |
If you are ready to move forward, request a proposal with itemised payment terms, and we will send you a full cost breakdown tied to each milestone before you sign anything.
If we miss a milestone deadline by more than 7 business days without prior written notice, the next phase of payment is deferred by the same number of days. We have been doing this long enough to know that accountability goes both ways.
Yes. Projects can be paused with 14 days written notice. Any work completed up to the pause point is invoiced at the pro-rata milestone rate. Projects left paused for more than 90 days are treated as cancelled, and a reactivation fee may apply to re-scope and pick up the work.
Yes, full intellectual property and source code ownership transfer to you upon receipt of the final invoice payment. Until that point, we retain IP as security. This is standard industry practice.
Each milestone has a defined review period. If a deliverable does not meet the agreed specification, we fix it before the invoice is issued. If there’s a genuine dispute, we go to mediation before any legal route; in practice, we have never needed either.
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