Model a SaaS price increase before you ship it. See the revenue impact at your churn assumptions, the break-even churn rate you can survive, and grandfathering math.
At 5% churn, a 20% increase adds $7,000/month ($84,000/year). You could lose up to 16.7% of your MRR to churn and still come out ahead.
| Churn from increase | New MRR | Annual impact |
|---|---|---|
| 0% | $60,000 | $120,000 |
| 5% | $57,000 | $84,000 |
| 10% | $54,000 | $48,000 |
| 15% | $51,000 | $12,000 |
| 20% | $48,000 | −$24,000 |
| 25% | $45,000 | −$60,000 |
Apply the increase to new customers only and the existing base carries zero churn risk. At $5,000 of new MRR per month, the higher price earns an extra $78,000 over the next 12 months, compared with $84,000 from raising everyone today at your expected churn. Grandfathering trades the existing-base uplift for certainty.
Rolling a price change out safely, new customers first and cohort by cohort, with grandfathering rules and win-back offers, is exactly what ParityDeals is built for.
Every price increase argument eventually reduces to one inequality. Does the extra revenue from customers who stay exceed the revenue lost from customers who leave? That resolves to a single number, the break-even churn rate.
break-even churn = increase ÷ (1 + increase)
A 20% increase breaks even at 16.7% churn. A 12.5% increase breaks even at 11.1%, meaning you could lose one customer in nine and still come out ahead. The asymmetry surprises most founders. Because the increase applies to everyone who stays, churn has to run remarkably high before a raise loses money. The calculator above puts your own numbers through it and shows the sensitivity table either side of the line.
Price flows straight through to profit in a way volume never does. McKinsey’s long-standing analysis puts a 1% price improvement at roughly 8% more operating profit for a typical company, and Price Intelligently’s subscription-specific figure is about 11%. The same research found companies spend a total of about six hours on pricing decisions, and it recommends re-evaluating quarterly and changing roughly every six months.
The market has been acting on it. SaaStr measured SaaS pricing up 11.4% year over year against 2.7% general inflation during the 2025 price surge, with half of vendors planning further increases.
The most useful finding in the pricing literature is not about customers leaving. Simon-Kucher’s Global Pricing Study finds companies realize less than half of the price increases they announce, eroded by discount exceptions, “just this account” carve-outs, and unenforced renewals. A 10% announced increase that ships as a 4% realized one changes your break-even math completely. Whatever number you model in the calculator, the operational question is whether your billing actually enforces it.
Case studies bracket the range of outcomes. Zendesk’s 2010 increase, effectively 60-300% for early customers, produced a revolt, an apology, and permanent grandfathering. Salesforce’s 9% (2023) and 6% (2025) increases and Slack’s 20% Business+ raise went through with renewals holding. The difference was magnitude, notice, and a credible value story, not the existence of an increase.
Raising prices for new customers only carries zero churn risk, and it forgoes the uplift on your entire existing base. The panel above quantifies that trade over 12 months using your growth rate, and at typical growth rates the existing-base path earns more even after churn.
The published guidance leans against making grandfathering permanent. Paddle’s legacy-pricing analysis found grandfathered customers churn more, not less, while capping expansion revenue forever, and recommends a time-boxed bridge of about 12 months at the old rate. Patrick Campbell’s refinement is grandfather discounting, which moves everyone to the new list price and gives existing customers an expiring discount. The anchor resets on day one, and the discount, not the price, is what decays.
The break-even math says most well-sized increases are safe in aggregate. The execution risk is concentrated in specific segments, such as high-usage accounts, annual renewals landing in the same month, and customers acquired on deep discounts. Rolling out by cohort (new customers first, then monthly renewals, then annuals), pairing the increase with a dated announcement and a bridge offer, and watching realized rather than announced price per account is what separates the Salesforce outcomes from the Zendesk ones.