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Glossary
Subscription Pricing Models
Subscription pricing models are the structures a vendor uses to charge for recurring access. Each one picks a billing unit and a rate: a flat plan fee, a per-user fee, a rate that changes with quantity, or a charge that tracks consumption. Most live products combine several.
Key Takeaways
Stripe's docs reduce the field to four patterns: flat rate, per-seat, tiered, and usage-based.
The model is a rate structure, not a packaging decision. Basic, Pro, and Enterprise plans are packaging, and any rate structure can sit inside each of them.
Postmark runs a flat fee plus metered overage, at $15.00/mo with "Extra emails @ $1.80 / 1,000" on Basic and $18.00/mo at $1.20 / 1,000 on Platform.
Stripe Tax runs pure usage with no plan fee at all, charging 0.5% per transaction on its low-code integration.
Anrok charges a recurring per-unit fee on a non-seat unit, $100 per market per month, where a market is one tax jurisdiction.
What are the main subscription pricing models?
Stripe's documentation publishes the shortest taxonomy that holds up, four patterns covering almost every recurring product. For six models and the tradeoffs of each, our guide to subscription pricing models for SaaS teams goes deeper than a definition can.
The four structures, with what each one bills against:
Model | Billing unit | How Stripe describes it | A product using it |
|---|---|---|---|
Flat rate | The plan | "Customers choose a service tier... and pay a flat rate for it" | Postmark Basic at $15.00/mo |
Per-seat | One user | "Each pricing unit represents one user" | Notion Business at $20 per member / month |
Tiered | Quantity band | "The unit cost changes with quantity... or usage" | Postmark overage at $1.80 down to $1.20 per 1,000 |
Usage-based | Consumed units | "fixed fee and overage, pay as you go, and credit burndown" | Stripe Tax at 0.5% per transaction |
Anrok shows the per-unit structure doesn't have to count people. It charges $100 per market per month, defining a market as "any single jurisdiction where you have a tax obligation and need to register and file", so a company registered in California, New York, Texas, and the UK pays for four. The mechanics match per-seat pricing. Only the unit changed.
How do you choose between them?
Match the billing unit to whatever grows when the customer gets more value, then check your billing system can actually run it. Teams usually get the first half right and discover the second half late.
What each choice commits you to:
Flat rate gives you predictable revenue and no metering, and it caps expansion at whatever your upgrade path offers.
Per-seat ties growth to the customer's headcount, a number your product work can't influence.
Tiered needs a rate table and a decision between graduated and volume modes, which changes totals by double digits on the same usage. See tiered vs volume pricing.
Usage-based needs metering you trust before it needs pricing, since an invoice is only as defensible as the event data behind it.
Hybrid combinations are the common end state and where billing systems break, because one invoice carries a plan fee, metered lines, and credits at once.
A pricing model you can't invoice is a plan, not a price. Check whether your system can prorate mid-cycle changes, apply credits before overage, and reprice a period when late events arrive, then pick from what survives.
Related terms
Each of the structures above has its own entry with the mechanics worked out.
Per-Seat Pricing covers what counts as a billable seat and how proration works.
Consumption-Based Pricing is the model where the bill tracks actual use.
Hybrid Pricing Model covers plan fees, usage, and credits landing on one invoice.
Tiered vs Volume Pricing settles which rate mode a tier table should use.
Credit Burn-Down is the prepaid variant common in AI products.
Subscription Lifecycle is the state machine every one of these models bills against.
FAQ
What is the most common subscription pricing model?
Per-seat still covers the largest share of established B2B SaaS, and flat-rate tiers dominate self-serve tools. Newer AI products lean usage-based or credit-based, because their cost of goods moves with consumption and a fixed seat fee leaves the vendor carrying that variance.
Is tiered pricing a subscription pricing model or a packaging choice?
Both words get used, which is the problem. As a rate structure, tiered means the unit cost changes as quantity rises. As packaging, it means offering Basic, Pro, and Enterprise. They're independent choices, and a product can make both at once.
Can one product run more than one subscription pricing model?
Yes, and most at any scale do. Postmark's plans pair a flat monthly fee with a metered overage rate, which is two structures on one invoice. The combination is what people mean by hybrid pricing, and it's the case that most often outgrows a homegrown billing setup.
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