Serviceable addressable market (SAM) is the portion of the total addressable market (TAM) that a company’s actual product, business model and geographic reach can serve today. If TAM is global spending on accounting software, the SAM of a Turkish-language, SME-focused, cloud-only product is the cloud accounting spend of Turkish-speaking SMEs. SAM answers a different question than TAM: not “how big is the dream?” but “how big is the pond we are actually fishing in?”
Construction is segmentation: start from TAM and cut by language, geography, regulation, segment, deployment model and price band — every cut justified, sourced and dated. The discipline matters because SAM drives the realism chain: SOM is carved from SAM, unit economics are sanity-checked against it, and a SAM smaller than the revenue plan is the cheapest possible way to discover a strategy problem. SAM also moves: each localisation, licence or product line extension converts TAM into SAM, which is exactly how expansion roadmaps should be written.
The legal geometry of SAM
What separates SAM from TAM is often law: data-residency rules, licensing perimeters, consumer-protection regimes and language requirements define which customers are servable, not just which are reachable. Expanding SAM is therefore partly a legal project — a fintech entering a new jurisdiction converts TAM into SAM by obtaining the licence or partnering under someone else’s. In fundraising documents, label the three numbers honestly and keep the SAM methodology in the data room; the difference between an aggressive and a misleading market slide is exactly the documentation behind it.
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