The 80/20 rule in sales says that a small share of your customers, deals and activities produces most of your results: often around 80% of revenue from about 20% of customers. Teams use it to decide where to spend their time, which accounts to protect and which customers to look for next.
This guide explains where the rule comes from, how it shows up in a sales team, how to run the analysis on your own numbers and what to change once you have it. It is one of the tools in our guide to sales strategies, where focus on best-fit accounts is the first strategy on the list.
What is the Pareto principle?
The Pareto principle is the pattern behind the 80/20 rule: in many systems, a minority of causes produces a majority of the effects. It is named after the economist Vilfredo Pareto, whose studies showed that 80% of the land in Italy was owned by 20% of the population. The quality pioneer Joseph Juran later applied the same pattern to business problems and called it separating "the vital few" from "the useful many".
The numbers are a shorthand. Your own split may be 70/30 or 90/10. The rule holds when the split is uneven enough that treating every customer or activity the same wastes effort.
How does the 80/20 rule apply to sales?
The rule shows up wherever you can rank things by what they bring in. In a B2B sales team, these are the places to look first:
| Where to look | The "few" | What to do with it |
|---|---|---|
| Customers | The accounts that bring most of the revenue | Protect them, expand them and find more like them |
| Open deals | The deals that hold most of the pipeline value | Give them a weekly review and a written plan |
| Products | The packages most customers buy | Lead with them in the first call |
| Lead sources | The channels behind most closed-won deals | Move budget and time toward them |
| Activities | The tasks that lead to most first meetings | Block time for them before anything else |
| Lost-deal reasons | The two or three reasons behind most losses | Fix those in discovery and in the proposal |
Customers are the best place to start, because the data is already in your billing system and the result changes how the whole team spends its week.
Here is what the analysis looks like for Halcyon Labs, a fictional software company with 100 customers and $5 million in annual revenue:
| Category | Share of annual revenue |
|---|---|
| Top 20 customers | 76% |
| Customers 21 to 40 | 12% |
| Customers 41 to 60 | 6% |
| Customers 61 to 80 | 4% |
| Customers 81 to 100 | 2% |
Sample: Fictional example: 100 customers, $5,000,000 in annual revenue Method: Illustrative numbers, not survey data. Customers sorted by annual revenue and split into five groups of 20.
The top 20 customers bring $3.8 million of the $5 million. The first 40 bring 88%, and the last 40 bring 6%. Halcyon's split is 76/20, close enough to the rule to change how the team works.
How do you run an 80/20 analysis on your customers?
You need one spreadsheet and about an hour. Use revenue from the last 12 months, so a single big deal doesn't skew the picture.
- Export revenue by customer. One row per customer, with total revenue for the last 12 months.
- Sort from largest to smallest. Add a column with each customer's share of total revenue.
- Add a running total. In the next column, add each share to the one above it, so the last row reads 100%.
- Find the cut. Mark the row where the running total crosses 80%. Count the customers above it and divide by the total number of customers.
- Describe the top group. For the customers above the cut, list what they share: industry, size, the team that uses you, who signed, how they found you.
The fifth step is where the value is. The percentage tells you how concentrated your revenue is. The description tells your team which accounts to look for next. Watch the session account tiering and pipeline strategy for how an account executive turns a list like this into tiers for a territory.
What do you do with the top 20%?
Sort your customers into groups and give each one a level of attention that matches what it brings in. Nobody gets dropped; the lower groups get a lighter, cheaper touch.
Top 20%
- A named account manager
- A business review twice a year
- An expansion plan per account
Next 30%
- Check-ins every quarter
- Usage alerts
- Look for top-20% lookalikes
Last 50%
- Pooled support
- Self-serve renewals
- Email programs
The top group also tells you who to sell to next. If 15 of Halcyon's top 20 customers are clinics with more than ten locations, the next target list should start there. Our guide on how to increase sales shows how a better target list feeds the volume lever, and the sales techniques guide covers how to win those accounts on calls.
Watch the middle group closely. Some customers there are small today because they started with one team. They can become top accounts with the right expansion plan, so look at how many teams could use you, not only what they pay now.
How do you apply the 80/20 rule to your time?
The same rule works on a seller's week. A few activities lead to most first meetings and most closed deals, and the rest fill the calendar. To find them, compare where time goes with where deals come from.
Ask each person to log their week in half-hour blocks, then check the last ten deals they closed: where did each one start, and what moved it forward? Look for the few activities, such as calls to referred accounts or follow-ups after a business review, that started or moved most of those deals. Those go into protected blocks first. Our guide to sales productivity has a weekly plan for doing that.
Then set goals on the vital few. A goal like "two referral asks per week to top-20% customers" points people at the work that pays. Our guide to sales goals shows how to mix result and activity goals, and SMART goals for sales has examples you can copy.
Does the 80/20 rule really work?
Yes, as a way to find where effort pays most. It works less well as a rule to follow blindly. Three limits are worth knowing before you act on the numbers:
Two more points get mixed up. The 80 and the 20 measure different things (revenue and customers), so they don't need to add up to 100. And the rule describes last year's data. Run the analysis again every year, because the top group changes.
Where to start
Export last year's revenue by customer, sort it and find where the running total crosses 80%. Describe the customers above the line in one paragraph and share it with the team as the profile of who to call next. Then pick the strategy that fits that profile from our guide to sales strategies.