How Much It Costs to Maintain Software Per Year (No One Budgets This)
You approved the budget, the project went well, and the platform has been running for eight months. Then the uncomfortable conversation shows up: dependencies need updating, the payment provider changed its API, and someone needs to be on call when something breaks on a Friday at 6 p.m. Nobody budgeted for that. Maintenance is the most predictable cost in software, and still the one most companies leave out. Here are the real numbers and how to calculate it before it catches you off guard.
What maintenance actually includes
"Maintenance" sounds like fixing broken things, but that's only part of it. In a system running in production there are five distinct fronts:
1. Corrective. Bugs that surface with real-world use. Unavoidable: no software ships perfect, and edge cases only show up once there are real users.
2. Evolutionary. The changes the business asks for: a new field, another report, a workflow that changed. Usually the largest share of the spend, and a good sign — it means the tool is being used.
3. Preventive and security. Updating libraries, patching vulnerabilities, renewing certificates. The one that gets postponed the most, and the most expensive to ignore. If this concerns you, see cybersecurity for SMBs.
4. Adaptive. The world around your software changes without asking permission: iOS and Android ship a new version every year, the DIAN (Colombia's tax authority) adjusts electronic invoicing rules, your payment gateway deprecates an API. Your software has to keep up.
5. Infrastructure and monitoring. Servers, database, backups, domains, certificates, alerts when something goes down. This is what lets you find out before your customer does.
How much it costs per year
The rule the industry uses is a percentage of the initial development investment:
| System type | Annual maintenance | On a $40,000 USD investment |
|---|---|---|
| Corporate website | 10% – 15% | $4,000 – $6,000 |
| Business web application | 15% – 20% | $6,000 – $8,000 |
| Mobile app (iOS + Android) | 20% – 25% | $8,000 – $10,000 |
| Critical platform (fintech, healthcare, high traffic) | 25% – 35% | $10,000 – $14,000 |
Mobile apps sit at the top for a specific reason: Apple and Google force updates. Every year brings new OS versions and new store requirements. An app with no maintenance doesn't just stay the same — it breaks on its own, and eventually gets pulled from the store.
On top of those percentages, add infrastructure, which is billed separately and usually runs between $50 and $600 a month depending on traffic and architecture, plus third-party services: payment gateway, email delivery, messaging, AI models, maps.
Maintenance is the largest line item missing from most quotes, but it isn't the only one: infrastructure, third-party services, and internal adoption also hit the budget. The full five-year total is in total cost of ownership for enterprise software.
The three contracting models
| Model | How it works | When it makes sense |
|---|---|---|
| Hour bundle | You buy a package and draw it down | Stable systems with occasional changes |
| Monthly retainer | Fixed fee with defined scope and response times | Critical systems that can't afford downtime |
| On-demand | You pay each time something happens | Only for secondary systems |
The on-demand model looks the cheapest and is almost always the most expensive, for a simple reason: without anyone keeping watch, problems aren't caught early — they're caught once they're already serious. And fixing something in an emergency costs a lot more than preventing it.
If you go with a retainer, make sure the contract spells out response times (how quickly issues get addressed by severity), what's included and what isn't, who owns the code, and how many evolutionary hours are included per month. Without that, "maintenance" is a word each side interprets differently.
What happens if you decide not to pay for it
The software doesn't just switch off. It's a decline that happens quietly:
- Months 1-6: everything looks fine. Minor bugs pile up that nobody reports.
- Months 6-12: vulnerabilities show up in libraries that were never updated. Some external integration starts failing.
- Year 1-2: an iOS or Android update breaks the app. A third-party API stops working. Now it's urgent.
- Year 2-3: updating has become so costly that someone proposes "let's just rebuild it."
That last point is the real cost of skipping maintenance: rebuilding a system costs a lot more than maintaining it would have, and on top of that you lose months of operation during the transition. It's exactly the scenario we describe in digital transformation: how to modernize your software.
How to lower the cost without lowering quality
- Prioritize for real. Not everything requested is urgent. A list prioritized by impact keeps the budget from going to cosmetic details.
- Automate testing. Costs upfront and reduces corrective work for years.
- Choose technologies that are alive. A popular, well-maintained stack — React, Next.js, Node.js — gets frequent updates, has a community, and has people available to work on it. A niche technology leaves you with few vendors and high prices.
- Monitor. Finding out from an alert costs a lot less than finding out from an angry customer.
- Document. Without documentation, every vendor change means paying again just to understand the system.
- Batch the changes. A monthly release cycle of improvements delivers more than twenty scattered requests.
At BigBoc we define maintenance as part of the initial proposal, with clear scope and cost, so it doesn't show up as a surprise six months after launch.
Frequently asked questions
Is maintenance mandatory? Technically no, but software with no maintenance has an expiration date. The question isn't whether you'll pay for it, but whether you pay for it planned or as an emergency.
Can I maintain it with my own in-house team? Yes, if you have the right profile. For many mid-sized companies, hiring a full-time developer for a single system isn't justified.
Can I switch maintenance providers? Yes, as long as you have the code, the access, and some documentation. Confirm in the initial contract that all of that belongs to you.
Do mobile apps need more maintenance? Yes. Annual iOS and Android updates and store requirements aren't optional.
How much should I budget for the first year? A reasonable rule: 20% of the initial investment, plus infrastructure. Adjust based on how critical the system is.
Budget for it from day one
Maintenance isn't an unexpected expense: it's a known part of the total cost of owning software, and the only variable is whether you plan for it or get caught by surprise. Including it in the initial budget is what separates a project that lasts for years from one you'll have to rebuild. At BigBoc we build and maintain software for companies across Colombia and Latin America with React, Next.js, Node.js, and artificial intelligence.
Want to know how much it would cost to maintain your system? Request your free quote at bigboc.com/cotizacion and get a proposal with scope, timeline, and costs in under 24 hours. Have software that's been left without support? Tell us about it.