In many growing businesses, IT spending is a series of surprises: a server that fails, a licence renewal nobody expected, a laptop for someone who starts on Monday. A budget turns those into planned costs.
Separate the three kinds of spending
Running costs recur every month: licences, managed services, internet and phones. Replacement costs come round on a cycle: laptops, servers, network equipment. Project costs are one-off: a new office, a migration, a security uplift. Budget each one separately.
Start with an asset list
List every device with its purchase date and expected life. From that you can see what falls due each year and spread the cost, so replacements don't land all at once.
Track renewals
Record every licence, support contract, domain name and certificate with its renewal date and cost. Renewals are the easiest costs to predict and the ones most often forgotten.
Budget per person
Work out what one staff member costs in licences, device, support and security each year. When the business plans to hire, the IT cost follows directly.
Treat security as a running cost
Security isn't a one-off project. Tools, monitoring, training and backup are ongoing, and customers and insurers now expect them. Give them their own line.
Keep something in reserve
Things still break. A contingency for unplanned failures stops one bad month from derailing the plan.
Tie projects to business plans
Ask what the business intends to do this year: open a site, add staff, win a contract that needs a security standard. Each one has an IT cost, and it is cheaper planned than rushed.
Review it quarterly
Compare actual spending with the budget every quarter. Your IT provider should bring the asset and renewal data and recommend what to do next.
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