Net ARR is the total dollar change in a subscription company’s annual recurring revenue base over a period, after every gain and every loss is counted. If a SaaS company starts a quarter at $10 million in ARR and ends at $10.35 million, its Net ARR for that quarter is $350,000. The number captures the combined effect of new sales, upgrades, downgrades, and cancellations, which is why it’s the clearest single indicator of whether a subscription business is actually growing or quietly shrinking.
The Four Inputs
Net ARR pulls together four distinct revenue movements. Each one needs to be tracked separately for the total to mean anything.
- New Business ARR is annualized recurring revenue from customers who signed their first contract during the period. It’s the direct output of sales and marketing.
- Expansion ARR is additional annualized revenue from existing customers who upgraded tiers, added seats, or purchased new modules. Expansion tends to be more profitable than new business because the acquisition cost was already absorbed.
- Contraction ARR is annualized revenue lost when existing customers downgrade a plan or reduce seat count. It often signals early dissatisfaction or a shift in the customer’s own business, and it’s a warning sign short of a full loss.
- Churn ARR is annualized revenue from customers who canceled entirely. This is the most painful component because the revenue relationship is gone.
New Business and Expansion drive growth. Contraction and Churn work against it. Net ARR shows which force is winning.
The Formula
Net ARR = (New Business ARR + Expansion ARR) − (Contraction ARR + Churn ARR)
Every contract change during the period has to be annualized before it enters the formula. A customer who signs a $5,000-per-month deal partway through the quarter contributes $60,000 in New Business ARR, not whatever partial amount was invoiced.
Here’s the math on a real example. A SaaS company begins Q2 with $10,000,000 in existing ARR. During the quarter:
- New customers sign contracts worth $350,000 in annualized revenue.
- Existing customers add seats and upgrade tiers, generating $120,000 in additional annualized revenue.
- Downgrades reduce total ARR by $30,000.
- Cancellations account for $90,000 in lost annualized revenue.
Applying the formula: ($350,000 + $120,000) − ($30,000 + $90,000) = $470,000 − $120,000 = $350,000 in Net ARR.
Ending ARR is now $10,350,000. On an annualized basis, the company is growing its ARR at roughly 14% per year.
What to Exclude
ARR counts only predictable, repeating subscription revenue. Anything that requires a separate purchase decision each time it occurs does not belong in the number. The most common items to strip out are one-time implementation or setup fees, professional services and consulting engagements, training charges, and hardware sales. Including any of these inflates the number and distorts the growth picture Net ARR is supposed to provide.
The logic is straightforward. If a customer pays a $15,000 implementation fee alongside a $60,000 annual subscription, only the $60,000 enters ARR. The implementation fee won’t recur next year without a new engagement, so treating it as recurring revenue would mislead anyone using the metric for forecasting or valuation.
Reading the Result
A positive Net ARR means the business is adding recurring revenue faster than it’s losing it. That sounds obvious, but the components behind the number matter as much as the total. Two companies can post the same Net ARR and be in very different positions.
Company A gets to $350,000 with $400,000 in New Business, $50,000 in Expansion, $20,000 in Contraction, and $80,000 in Churn. Company B gets to the same $350,000 with $200,000 in New Business, $250,000 in Expansion, $40,000 in Contraction, and $60,000 in Churn. Company B is in a far stronger position. Its existing customers are actively spending more, which means the customer base itself is a growth engine and the company is less dependent on expensive new-logo acquisition to keep growing.
A negative Net ARR is a red flag. It means the company is losing more revenue to downgrades and cancellations than it’s gaining from new deals and expansions. The revenue base is shrinking, and the effect compounds. Fewer customers means less expansion potential, which makes the next period’s Net ARR even harder to turn positive.
When diagnosing a weak number, look at which component is doing the most damage. High Churn ARR usually points to product or onboarding problems. High Contraction ARR often signals pricing friction or customers who were oversold features they didn’t need. Low Expansion ARR in an otherwise healthy business suggests the account management team isn’t surfacing upsell opportunities, or the product lacks natural upgrade paths.
Common Mistakes That Corrupt the Number
The formula is simple. The mistakes happen in how the inputs are classified.
- Counting non-recurring revenue. Implementation fees, one-time training charges, and professional services don’t belong in ARR. Including them inflates Net ARR and creates a false growth signal that will reverse in future periods.
- Misclassifying churn as contraction. When a customer cancels one product line but keeps another, the lost revenue is churn on that product, not contraction. Blurring the distinction makes churn rates look artificially low and leads to the wrong corrective actions.
- Ignoring annualization on mid-period contracts. A customer who signs a $10,000-per-month deal in the last week of the quarter contributes $120,000 in New Business ARR, not the $10,000 actually invoiced. Skipping this step understates growth in periods with strong late-quarter bookings.
- Double-counting expansion as new business. When an existing customer signs a contract for a completely new product, some teams book it as New Business ARR. The customer already existed in the base, so the revenue increase belongs in Expansion. Miscategorizing it inflates New Business, distorts retention math, and makes account management look less productive than it is.
Each component drives a different operational response. If churn is hidden inside contraction, the urgency to fix retention gets diluted. If expansion is credited to new business, the account management function looks weaker than reality. Clean data in each bucket is what makes Net ARR a decision-making tool rather than a reporting artifact.
Net ARR, Gross ARR, and Net Dollar Retention
Two related metrics show up alongside Net ARR and are easy to confuse with it.
Gross ARR measures only the positive side of the ledger: New Business ARR plus Expansion ARR. It tells you how much new recurring revenue the sales organization generated but says nothing about how much leaked out the back door. The gap between Gross ARR and Net ARR is the total loss from contraction and churn. A company posting $500,000 in quarterly Gross ARR but only $100,000 in Net ARR is losing $400,000 to downgrades and cancellations. Gross ARR is useful for evaluating sales productivity in isolation. Net ARR is what you use to evaluate the business.
Net Dollar Retention (NDR), sometimes called Net Revenue Retention, is the percentage version of what happens inside the existing customer base. It ignores new business entirely:
NDR = (Starting ARR + Expansion ARR − Contraction ARR − Churn ARR) ÷ Starting ARR × 100
An NDR above 100% means existing customers are spending more this period than last, even after every downgrade and cancellation. As of early 2026, the median NDR for public SaaS companies sits around 108%, though the number varies with deal size. Companies selling contracts worth over $100,000 annually tend to post median NDR around 108%, while companies with average contract values under $1,000 often see median NDR closer to 96%. Best-in-class SaaS companies push NDR above 120%. If NDR sits below 100%, Net ARR will stay positive only as long as new business acquisition can outrun the erosion in the existing base, which is an expensive and fragile way to grow.
Why Net ARR Growth Drives Valuation
For SaaS companies, growth rate is the primary driver of valuation multiples, and Net ARR growth is the clearest expression of that rate. A company growing Net ARR at 40% year-over-year will generally command roughly double the revenue multiple of one growing at 10%. The relationship isn’t linear either. The premium for speed accelerates at higher growth rates.
As a rough framework for private SaaS companies in 2026, annual growth under 10% tends to produce ARR multiples of 1x to 2.5x, with many buyers shifting to EBITDA-based valuations in that range. Growth between 10% and 30% corresponds to roughly 2.5x to 4.5x ARR. Growth of 30% to 60% sees multiples of 4.5x to 7x, and above 60% growth can push valuations to 7x to 10x ARR or higher.
The composition of Net ARR matters for valuation too, not just the total. Growth driven primarily by expansion revenue signals a stickier, more capital-efficient business than growth driven entirely by new logo acquisition. Acquirers and investors decompose Net ARR into its four parts to understand where growth is coming from and how sustainable it looks. A company with strong expansion and low churn can justify a premium multiple because that pattern is more likely to persist.