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On four published plans from two providers, 50 users come to between $600 and $1,250 a month in subscription fees. Atlantech Online advertises UCaaS lines starting at $12 and $18 per user per month, which comes to $600 or $900 for 50 users. Nextiva lists $15 and $25 per user per month on annual small-business terms, which comes to $750 or $1,250. Those totals are the per-user rate times 50. The full budget depends on what each quote includes beyond that rate, such as phones, setup and taxes.