ARR and revenue can sound interchangeable, but they measure very different things.
For SaaS and increasingly AI companies, annual recurring revenue (ARR) is a forward-looking operating metric that estimates the annual value of recurring subscriptions or contracts. Revenue, by contrast, is the amount a company actually recognizes over a specific accounting period.
That difference matters because fast-growing private companies often highlight ARR or annualized revenue run rates long before investors see audited annual financial statements.
Stripe defines ARR as the recurring revenue components of a business measured over one year, typically including subscriptions and other predictable contractual income.
What Is ARR?
ARR measures the annualized value of recurring business.
For a simple SaaS company, the calculation can be straightforward:
ARR = Monthly Recurring Revenue × 12
If a company has $100 million in monthly recurring subscriptions, its ARR would be $1.2 billion.
ARR usually excludes one-time implementation fees, consulting projects and other non-recurring revenue. The goal is to show how large the company’s predictable subscription base has become.
That is why ARR is especially useful for SaaS businesses, where customers often pay monthly or annually for continued access to software.
AI companies are increasingly using similar metrics as enterprise customers sign longer-term contracts for models, APIs and workplace products.
Revenue Follows Accounting Rules
Revenue is different because it is recognized according to accounting standards.
Under ASC 606, companies generally recognize revenue when they satisfy their obligations to customers. For SaaS subscriptions, that often means recognizing revenue progressively over the duration of the contract rather than recording the entire contract value immediately.
Suppose a customer signs a one-year software contract worth $120,000.
That contract might contribute $120,000 to ARR immediately, because it represents $120,000 of annual recurring business.
But accounting revenue might be recognized at roughly $10,000 per month as the service is delivered.
This is why ARR can grow much faster than reported revenue during periods of rapid customer acquisition.
ARR Can Also Mean Revenue Run Rate
There is another complication: companies sometimes use “ARR” to mean annualized revenue run rate, which is not the same as annual recurring revenue.
A revenue run rate takes recent sales — often one month or one quarter — and extrapolates them over a full year.
For example, a company generating $5 billion in one quarter could be described as operating at a $20 billion annualized revenue run rate, even if not all of that revenue is recurring.
This distinction has become particularly important in AI.
Anthropic, for example, recently reported an annualized revenue run rate of about $65 billion. That figure was designed to show the company’s current pace of growth, not how much revenue it had already earned during the year.
