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Service credits are calculated from the shortfall against the committed availability, typically in steps with a cap at 100 percent of the monthly fee. The important observation is that credits rarely compensate for business impact: 0.5 percent of a month is 3.6 hours of outage, for which a 25 percent credit on a modest monthly fee is trivial next to lost revenue.
Service credit
shortfall = committed - actual; credit % = shortfall / 0.1 x credit per tenth, capped at 100%; credit = monthly fee x credit %
Almost always, and usually within a short window such as 30 days. Providers rarely apply them automatically, so unclaimed credits are simply forfeited.
They are a pricing adjustment, not compensation. For genuinely critical services the answer is architectural redundancy across providers rather than a stronger SLA.