Budgeting for a Two Year Software Build: The Forgotten Line Items

What you actually need to know

• Development is roughly half the real cost over two years.
• Infrastructure, security, compliance, third party services, and maintenance are the other half.
• A 20 to 30 percent contingency is not optional.
• Maintenance is highest in the first year after launch.
• Founders who skip these line items run out of money in month fourteen.

The core argument

The pattern that ruins software projects is consistent enough to be predictable. The founder gets a development quote. The development quote is honest. The founder funds the development quote and assumes the rest is rounding error. Twelve to fourteen months later, the development is mostly done but the project is out of runway because nobody budgeted for the operational reality of running a real product.

The fix is mechanical. Build the budget around the full system, not around the development cost. Infrastructure costs money. Observability costs money. Security and compliance cost money. Third party services cost money. Design and content cost money. Maintenance costs money. Each is small compared to development. Together they often equal it.

The other piece is the contingency. A two year software build has unknown unknowns. The customer asks for a feature that requires unexpected integration work. A third party vendor changes their pricing. A new compliance requirement lands. A senior engineer leaves and onboarding the replacement burns a quarter. The contingency funds the response. Without it, the project either compromises on quality or runs out of money.

The discipline I have seen actually work is to budget conservatively, track honestly, and review monthly. The honest tracking is the part most founders skip. A budget that does not get reviewed is a wish. A budget that gets reviewed monthly is a tool.

The forgotten line items, with numbers

The numbers are realistic ranges from projects I have shipped or worked on. The high end is for products with serious compliance scope. The low end is for early stage products with light requirements.

Where founders most often go wrong

The cheapest sounding cloud bill estimate. The estimate from a developer who has not run production infrastructure is usually a fraction of the real cost. Egress, NAT gateways, snapshot storage, and idle resources add up.

The single quote for the SOC 2 audit. The audit itself is one cost. The implementation engineering, the platform like Vanta or Drata, the security tooling, and the ongoing operations all add up. The audit is the last fifteen percent of the cost.

The maintenance projection. Founders project that maintenance will be ten percent of the development cost. The reality is twenty to twenty five percent in the first year after launch, fifteen to twenty percent in steady state. The gap is real money.

The hiring projection. The team can do everything is a common assumption. The reality is that a two year build typically requires at least one hire and often two or three. Each one has recruiter cost, equity dilution, and onboarding time.

The contingency. Most budgets do not have one. The unknown unknowns get charged against scope. Quality suffers. Schedule slips. The contingency is the thing that allows the project to absorb the unknown.

Features the budget must have

• A monthly review with the executive sponsor.
• A category breakdown that distinguishes development from operations.
• A contingency line that is not allowed to fund scope creep.
• An infrastructure line that scales with usage, not a flat estimate.
• A maintenance line that activates the day after launch.
• A compliance line if the product has any regulated component.
• A communications plan when the budget shifts.

Expert opinion

The founders who run out of money in month fourteen are not bad at planning. They are good at the development plan and missing on everything else. The development quote is a real number. It is also half the story. The other half is the operational reality of running a real product. A budget that names the second half is a budget that survives.

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Yashveer Singh, founder of Yashveer Labs

How this played out on a real project

A client building a B2B SaaS had a 280k USD development budget for an eighteen month build. The development was honest. The product shipped at month sixteen with two months of runway left.

The first month after launch revealed the missing line items. Cloud infrastructure was 2800 USD per month against a budget of 800. SOC 2 was needed for their first enterprise customer and added 32000 USD. Observability added 1500 USD per month. The team needed a second engineer hire that added 130k USD annual cost plus recruiter fees.

The project survived because the team raised a small bridge round. The honest version of the budget at the start would have shown the full picture and changed the fundraise size from the beginning. The painful version was learning it under pressure.

For more on the related work, see the honest cost of building an app in 2026 global breakdown and maintenance budgets what to expect after launch.

Common mistakes founders make

1. Budgeting only for development. The other half disappears.
2. Underestimating cloud and infrastructure costs.
3. Skipping the contingency.
4. No monthly budget review. The numbers drift.
5. Confusing the development quote with the project budget.
6. Skipping compliance until customers ask. The retrofit is expensive.
7. Skipping the hiring line. The team grows. The budget needs to know.
8. No reserve for the post launch maintenance year.

A pre fundraise budget exercise

1. Day one. Get the honest development quote.
2. Day two. Map the third party services you will use. Estimate them at two scale points.
3. Day three. Model infrastructure at two scale points.
4. Day four. Add security and compliance. The honest version, not the cheapest version.
5. Day five. Add design, content, hiring, and maintenance.
6. Day six. Add the contingency.
7. Day seven. Compare to fundraise size. Adjust scope or raise more.

For more on the related work, read the honest cost of building an app in 2026 global breakdown and why your software quote is different from mine a pricing postmortem. On the maintenance side, maintenance budgets what to expect after launch is the natural next read.