--- title: "How to budget for a software project (and what to expect)" url: "https://www.octalhq.com.au/insights/articles/how-to-budget-for-a-software-project" kind: article description: "How to budget for a custom software project: setting a realistic figure, what to expect at each stage, and how to avoid the surprises that blow budgets." published: "2026-05-08T00:00:00.000Z" updated: "2026-09-26T07:38:20Z" topics: ["Buying software"] --- # How to budget for a software project (and what to expect) Budgeting for a software build feels like guessing — but it doesn't have to. Here's how to set a realistic budget, what to expect at each stage, and how to avoid surprises. The short answer: budget for a software project in three parts — a small fixed scoping phase, the build (quoted off that scope), and an ongoing monthly amount to run and maintain it. The way to avoid surprises is to scope properly first and insist on a fixed quote, so the number is known before the build begins. ## The short version - Budget in three parts: scoping, build, and ongoing running/maintenance. - Scoping is small and fixed; it produces an accurate build quote. - The build should be a fixed price off the scope — not open-ended hourly work. - Always budget for ongoing maintenance; a system no one maintains fails. ## Part 1: scoping (small and fixed) Start with a fixed-fee scoping phase — in Australia, typically a few thousand dollars, roughly $2,500–5,000. It maps how your operation actually runs and produces a real, accurate quote for the build. Budgeting for this first is what makes everything else predictable: you're spending a small, known amount to find out the big number, rather than committing to the big number blind. It's also useful in its own right — the output is a clear picture of your operation that's yours to keep, even if you decide to go no further. Think of it as the cheapest insurance against building the wrong thing. ## Part 2: the build (fixed off the scope) Once scoped, the build is quoted up front — typically somewhere between $8,000 and $80,000 depending on complexity, as covered in [what custom software actually costs in Australia](/insights/articles/what-custom-software-actually-costs-in-australia). Insist on a fixed price rather than hourly billing. Fixed scope plus fixed quote is what protects your budget from the overruns custom software is infamous for: with hourly work, vague requirements let the meter run indefinitely, but with a fixed quote off a proper scope, the number only moves if you deliberately add something. You should know what you're spending before a line of it is built. ## Part 3: ongoing (don't forget it) Budget a monthly amount to run, support and improve the system — roughly $250–5,000, priced to the size of your operation. This is the part businesses most often forget, and forgetting it is a genuine reason builds fail: no one funded the maintenance, so when a tool it integrates with updates or the process changes, there's no one to keep it healthy, and it quietly rots. Software isn't a one-off purchase like a piece of equipment; it's an ongoing part of the operation, like your accounting or your insurance. Treat it as a standing line in the budget from day one, not an afterthought. ## What should you expect at each stage? - **Discovery** — you'll spend time walking your process with the team building it; the output is a scope and a fixed quote. Expect questions, not sales pressure. - **Build** — regular checkpoints to review progress and adjust. Most builds go live in weeks, not months, because they start small rather than trying to do everything at once. - **Rollout** — training your people and migrating your data, leading to a defined go-live rather than a vague "it's ready." - **Ongoing** — issues resolved as they arise, and the system improved as you grow, so it keeps fitting the business over time. ## How do you avoid the surprises that blow budgets? - **Scope before you budget the build.** Don't guess the big number; spend a small, fixed amount to find it out properly. - **Get it fixed-price.** A fixed quote off a clear scope is the single biggest protection against overruns. - **Budget the ongoing cost from day one.** A build with no maintenance budget is a build that will fail later. - **Start small.** A first, focused piece keeps the initial spend modest, proves the approach, and often starts paying off before you commit to more. There's more on this in [how to keep a custom build affordable](/insights/articles/how-to-keep-a-custom-build-affordable). Most budget blowouts come from skipping the first two of these — starting to build before the scope is clear, on an open-ended hourly arrangement. Get those right and the "software projects always go over budget" story simply doesn't apply to you. ## What if you can't afford the whole thing yet? Then don't budget for the whole thing yet. The start-small approach exists precisely for this: budget the scoping phase, then budget a single focused build that fixes your most painful, most valuable problem first. Prove it, let it start paying off, and fund the next piece partly from the savings it generates. You never have to budget the top of the range up front, and a good partner will help you sequence the spend so each stage earns its keep before the next begins. ## Related reading - [What custom software actually costs in Australia](/insights/articles/what-custom-software-actually-costs-in-australia) — the ranges behind each part of the budget. - [How to keep a custom build affordable](/insights/articles/how-to-keep-a-custom-build-affordable) — the levers that lower each number. - [Is custom software worth it? A simple ROI framework](/insights/articles/is-custom-software-worth-it-roi) — checking the budget against the return. ## The honest first step The scoping phase *is* the budgeting step — it turns a vague "how much?" into a real number for your specific operation, at low, fixed cost. That's where a realistic budget comes from. Software should fit the business, not the other way round. *Tell us what you run, and we'll show you what's possible.*