A Beginner's Guide to Azure Costs and Avoiding Surprise Bills

Almost everyone I've helped get started on Azure has had at least one moment of opening their bill and not recognizing the number. Here's how to avoid that.

Set a budget before you build anything

Azure has a Budgets feature under Cost Management that lets you set a monthly spending limit and get alerted at percentages of it, say 50%, 80%, and 100%. Set this up on day one, even with a rough guess at a number. It won't stop spending automatically, but it will tell you early that something's off, instead of you finding out a month later when the invoice arrives.

The thing that catches almost everyone: forgetting to turn things off

Virtual machines, in particular, charge you for every hour they're running, whether you're using them or not. I've seen test VMs left running over a weekend, or worse, over a holiday, racking up charges for compute nobody needed. If you're testing something and don't need it running constantly, either shut it down manually when you're done, or set up an auto shutdown schedule, which is a free setting available on every VM.

Watch for resources nobody's using anymore

Storage accounts, disks that got detached from a VM you deleted, and old databases from a finished project all keep costing money quietly in the background. None of them are expensive individually, but they add up, and they're easy to forget about because they don't show up anywhere obvious once the project they belonged to is done. A periodic look through Cost Management's cost by resource view catches most of this.

Understand that pricing tiers matter a lot

The same type of resource, say a database, can vary wildly in price depending on the tier you pick. It's common to default to a higher tier than you actually need because it's the first option shown, or because a tutorial used it. Take five minutes to actually read what tier you need for your workload rather than accepting the default.

Use the pricing calculator before committing to anything big

Before deploying something at real scale, Microsoft's Azure pricing calculator lets you estimate monthly costs based on your actual configuration. It's not perfect, but it catches obvious mistakes, like picking a premium tier when a standard one would do the job fine.

None of this is complicated once you know to look for it. The surprises mostly come from things left running by accident, not from Azure being inherently expensive. A few minutes of housekeeping a month prevents almost all of it.