How Much Does Slack Cost in 2026?

Slack Pro costs $8.75 per user per month on monthly billing, or $7.25 per user per month with annual billing. Business+ costs $15 per user per month (annual billing only). Enterprise Grid pricing is negotiated individually, typically ranging from $15 to $25 per user per month based on volume and contract terms.

Yes, Slack offers a free plan with no time limit. However, it comes with significant restrictions: 90-day searchable message history, messages older than one year are permanently deleted, a maximum of 10 active integrations, and 1:1 calls only (no group audio or video). Most teams outgrow the free plan once they pass 15 to 20 active users.

No. Slack's Fair Billing Policy automatically stops billing for users who have been inactive for 28 consecutive days and issues a prorated credit toward your next invoice. The credit is applied automatically; you do not need to request it. However, the 28-day window is longer than the previous 14-day policy (changed June 2023), so the savings are less generous than they once were.

If you already pay for Microsoft 365, Teams is included at no extra cost, making it significantly cheaper than adding Slack. However, Slack bundles AI features into all paid plans at no extra charge, while Microsoft Copilot costs $18 to $21 per user per month on top of your M365 subscription. For a 100-person team, that AI cost difference alone is $21,600 to $25,200 per year.

Slack enforces a mandatory 9% year-over-year price increase at contract renewal for most enterprise agreements. This means a Business+ contract that costs $15,000 in year one will cost $16,350 in year two and $17,822 in year three. Over three years, a 100-person Business+ team pays $49,172 instead of $45,000, adding $4,172 above flat pricing. You can negotiate to reduce or cap this escalation by committing to multi-year terms or demonstrating 15% or more ARR growth.