In this guide
Quick answer
Slack costs $7.25 to $15 per user per month on paid plans billed annually ($8.75 to $18 billed monthly), with a free plan and quote-based Enterprise+. A 50-person team pays $4,350 a year on Pro or $9,000 on Business+ at list price, before any discount.
Key takeaways
- Cheapest paid plan: Pro at $7.25 per user per month, billed annually.
- Security-reviewed teams need Business+, because SAML SSO and SCIM start there.
- Biggest hidden cost: the jump from Pro to Business+, a 107% increase per user.
- Best way to save: clean up guests and leavers, then commit annually at quarter end.
Slack is one of those tools that starts free, spreads through a company one channel at a time, and then shows up as a real line item in the budget. The list prices are public and simple. What catches finance teams off guard is everything around them: which plan security actually requires, who counts as a billable member, and what happens at renewal.
This guide walks through all of it with prices checked against Slack's official pricing page.
How much does Slack cost?
Free
$0
90-day history, 10 apps, 1:1 huddles and Slack Connect
Pro
$7.25
$8.75 monthly
Unlimited history and apps, group huddles, canvases, AI summaries, Google OAuth sign-in
Business+
$15
$18 monthly
SAML SSO, SCIM, data residency, full exports, Slackbot agent, 4-hour support response
Enterprise+
Custom
Unlimited workspaces, audit logs, DLP, legal holds, HIPAA support
Slack (Free, Pro, Business+, Enterprise+). Source: slack.com, Prices verified 18 September 2026
Slack's Fair Billing Policy only charges for members who were active in the last 28 days and credits you for paid members who go inactive. Single-channel guests are free, but guests added to more than one channel are billed like full members. On annual plans, members added mid-term are billed on the last day of the month.
What each Slack plan includes
| Feature | Free | Pro | Business+ | Enterprise+ |
|---|---|---|---|---|
| Message and file history | 90 days | Unlimited | Unlimited | Unlimited |
| App integrations | 10 | Unlimited | Unlimited | Unlimited |
| Group huddles and Slack Connect | Not included | Included | Included | Included |
| AI summaries | Not included | Included | Included | Included |
| Slackbot agent, AI search, daily recaps | Not included | Not included | Included | Included |
| Single sign-on | Not included | Google OAuth | SAML | Multi-SAML |
| SCIM provisioning and data residency | Not included | Not included | Included | Included |
| Export all messages incl. private channels and DMs | Not included | Not included | Included | Included |
| Audit logs, DLP, legal holds, HIPAA support | Not included | Not included | Not included | Included |
Slack cost calculator
Your estimate
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per year at list price
- per user per month
- —
- Billed
- —
- 3 years
- —
List prices only. Taxes, custom quotes and negotiated discounts are not included.
Hidden costs to budget for
| Scenario | Annual cost | Change |
|---|---|---|
| Pro, billed annually (50 members) | $4,350 | Headline price |
| IT requires SAML SSO, so Business+ annually (50 members) | $9,000 | +$4,650 |
| Business+ paid monthly instead of annually (50 members) | $10,800 | +$1,800 |
- Multi-channel guests. Guests added to more than one channel are billed as members. Keep contractors in single channels where you can.
- Month-end prorated charges. On annual plans, members added mid-term are billed on the last day of the month, outside your original purchase order.
- Intro offers expire. The 50% off for three months applies only to monthly plans bought in a workspace's first 7 days.
- Non-refundable credits. Fair Billing credits have no cash value and expire when the contract ends.
- Enterprise add-ons. Enterprise Key Management is a paid add-on, and higher Slackbot limits on Business+ need Salesforce Flex Credits.
How Slack pricing has changed
- September 2022 Pro rose from $6.67 to $7.25 per user per month on annual billing, and from $8 to $8.75 monthly. Source
- 2025 Business+ rose from $12.50 to $15 annually as the separate AI add-on was folded into the plan. Source
- 18 September 2026 Checked against the official pricing page. Prices above are current.
Which Slack plan should you choose?
- Free. Choose if you are testing Slack with a small team and 90 days of history is enough.
- Pro. Choose if you need full history, group huddles and channels with clients or vendors.
- Business+. Choose if IT requires SAML, SCIM, data residency or full message exports.
- Enterprise+. Choose if you need HIPAA support, DLP, audit logs, legal holds or many workspaces.
Is Slack worth the price?
For most teams of 5 to 100 people, Pro is good value because it removes the history limit at the lowest paid price. Business+ earns its roughly doubled price only when identity, residency or export controls are hard requirements.
You are likely overpaying if: You already license Microsoft 365 or Google Workspace and only need basic chat, half your members rarely post, or you moved to Business+ purely for AI features.
How to pay less for Slack
- Clean up members and guests. Deactivate leavers and move multi-channel guests to single-channel before seats are counted.
- Commit annually. Annual billing is about 17% cheaper than monthly on both Pro and Business+.
- Use what you already own. If Microsoft 365 or Google Workspace is on your bill, Teams or Chat is already paid for. That is real leverage.
- Buy at quarter end. Slack is part of Salesforce, whose fiscal year ends 31 January.
- Go multi-year on Enterprise+. Vendr reports multi-year Slack deals can unlock a further 10 to 15%.
- Ask about eligible discounts. Slack runs discount programs for qualifying nonprofits and schools.
Copy-ready renewal email
Hi [Account manager], Our Slack renewal is on [renewal date]. Before we commit, we reviewed usage: [active members] of [licensed members] were active over the last 90 days. We would like to renew at [target members] on a [term] term, with any renewal increase capped at [cap]. We are also pricing Microsoft Teams, which is already included in our Microsoft 365 licenses. Can you share your best offer by [date]?
Slack alternatives and what they cost
| Tool | Entry price | Cheaper when |
|---|---|---|
| Microsoft Teams | $4 per user per month (Essentials, annual) | You already run Microsoft 365 |
| Google Workspace | $7 per user per month (Business Starter, annual) | You want email, docs and Chat on one bill |
| Mattermost | $10 per user per month (Professional) | You must host chat yourself |
The bigger picture: why Slack bills drift
Slack's price is rarely the real problem. The overspend comes from how it gets bought and renewed: a team upgrades on a card, IT owns the workspace, finance owns the renewal, and nobody owns the 30-day notice date.
Leavers stay billable
Slack seats outlive the people who used them.
Owners, seat counts and renewal dates for every vendor in one place.
The notice window closes
Slack renews at list price with last year's seat count.
Renewal alerts on every contract
The owner is alerted before renewals and expiries, with the signed terms one click away.
Teams buy their own accounts
Departments upgrade on a card without checking what the company already owns.
Purchase requests with approvals
Requests route and get approved before anyone buys; Z1 "Prompt to buy" keeps it fast.
Charges nobody approved
Mid-term seat additions land outside the original PO.
AP automation with PO matching
Invoices are matched to POs and receipts before payment.
No view of total software spend
Spend is spread across cards, invoices and entities.
Spend by vendor and category, synced two ways with your ERP.
The bottom line
Start on Pro, move to Business+ only when SAML, SCIM or data residency are hard requirements, and commit annually once adoption is proven. Then treat the renewal like a project with a date and an owner, 90 days before the term ends. That habit, applied to every tool you buy, is what Zapro was built to run.
Slack pricing FAQs
How much does Slack cost per user?
Slack Pro costs $7.25 per user per month billed annually or $8.75 billed monthly. Business+ costs $15 annually or $18 monthly. Slack only bills members who were active in the last 28 days, so inactive members earn prorated credits.
Is there a free version of Slack?
Yes. Slack Free has no time limit, but only shows the last 90 days of messages and files, allows 10 app integrations, limits huddles and Slack Connect to one-to-one, and deletes data older than one year.
How much is Slack Enterprise+?
Slack does not publish Enterprise+ pricing; it is quoted by sales. Vendr's data from 535 purchases shows Slack Enterprise deals typically between $21.95 and $28.10 per user per month, with a median of $26.18.
Can you get a discount on Slack?
Yes. Annual billing saves about 17%, new workspaces can get 50% off monthly plans for three months, qualifying nonprofits and schools have dedicated programs, and Enterprise+ buyers can negotiate multi-year terms.
Is Slack cheaper billed annually?
Yes. Pro drops from $8.75 to $7.25 per user per month and Business+ from $18 to $15, a saving of about 17%. For a 50-person Business+ team that is $1,800 a year.
What is the cheapest alternative to Slack?
Microsoft Teams Essentials is the cheapest mainstream option at $4 per user per month on annual billing. If your company already licenses Microsoft 365 or Google Workspace, Teams or Google Chat is often already included.
