Key takeaways
- The 80/20 rule in fundraising is the Pareto principle applied to a donor file: about 80% of a nonprofit's donation revenue comes from about 20% of its donors. It is a rule of thumb to check against your own data.
- Pooled donor data shows a steeper split. In the Fundraising Effectiveness Project's 2025 figures, donors who gave more than $500, about one in five, gave 94.1% of the dollars. Donors who gave $5,000 or more, 3.4% of donors, gave 78.6%.
- The 90/10 rule, about 90% of the money from about 10% of donors, is mostly a capital campaign rule of thumb. Kevin Heaney, Princeton's vice president for advancement, wrote in 2024 that some institutions see 95/5.
- In donor communication, 80/20 means something else: about 80% of what donors hear from you reports impact and says thanks, and about 20% asks for a gift.
- To measure your own split, total each donor's giving for 12 months, sort from largest to smallest, and find the share of donors it takes to reach 80% of revenue.
The 80/20 rule in fundraising says that about 80% of a nonprofit’s donation revenue comes from about 20% of its donors. It is the Pareto principle, named for the Italian economist Vilfredo Pareto, applied to a donor file. The 90/10 rule describes a steeper split, and pooled data is steeper still: in the Fundraising Effectiveness Project’s 2025 figures, the one in five donors who gave more than $500 gave 94.1% of the dollars. “80/20” also has a second meaning in donor communication: about 80% of your messages report impact and say thanks, and about 20% ask for a gift.
What is the 80/20 rule in fundraising?
The 80/20 rule in fundraising is the observation that a small group of donors gives most of the money: about 20% of donors, about 80% of revenue. It is a rule of thumb, and the exact numbers vary by donor file. The name traces to Vilfredo Pareto, who saw the same imbalance in Italian land ownership in the 1890s.
Joseph Juran, a quality engineer, named the pattern the Pareto principle in the early 1950s and called its two groups “the vital few” and “the trivial many”. “80/20” can also mean a spending split, 80% to programs and 20% to overhead, a ratio that Clark Nuber, a CPA firm, calls a myth. That is a different rule; see what a good overhead ratio looks like for the numbers from Form 990 data.
What is the 90/10 rule in fundraising?
The 90/10 rule says about 90% of the money comes from about 10% of donors. It is mostly a capital campaign rule of thumb, used to plan the largest gifts first. Kevin Heaney, Princeton’s vice president for advancement, writes in a 2024 handbook that campaign planners should now expect about 90/10, and that some institutions see 95/5.
Giving across thousands of nonprofits has moved the same way. The Fundraising Effectiveness Project, run by the AFP Foundation for Philanthropy and GivingTuesday, tracked 7.8 million donors at 15,102 nonprofits in 2025. Donors who gave more than $500, about one in five, gave 94.1% of the dollars. Donors who gave $5,000 or more, 3.4% of all donors, gave 78.6%. From 2021 to 2025, the share given by donors of $50,000 or more rose from 47.4% to 53.3%, while the number of donors fell for a fifth straight year.
The other 80/20: impact first, then the ask
Some fundraisers use “80/20” for donor communication instead. About 80% of what a donor hears from you should report impact or say thank you, and about 20% should ask for a gift. A June 2026 short from The Nonprofit Show calls this “the new 80/20 fundraising rule”. Steier Group, a campaign consulting firm, uses an 8-to-1 version: at least eight messages that thank or inform donors for every ask.
The two rules work together. The donors who give most of your revenue are the ones who most need to hear what their gifts did.
How to calculate your donor concentration
- Pick a period: the last 12 months, or the last 24 if your file is small.
- Total each donor’s giving for that period. Combine a household’s gifts, and credit donor-advised fund grants to the donor who recommended them, not to the fund.
- Sort donors from the largest total to the smallest.
- Add a running total, and divide it by total giving for the period.
- Find the row where the running share passes 80%. Divide that row number by the number of donors. That is your split.
- Note the share of revenue from your top 10% and your top 1% of donors as well, and track all three numbers each year.
For example, a nonprofit with 2,000 donors and $1 million in giving finds that its top 200 donors gave $820,000. That is 82% of revenue from 10% of donors, so its file looks more like 90/10 than 80/20.
What your split tells you
A steep split means more risk and more opportunity at once. If 10% of donors give 90% of revenue, losing two or three of your largest donors is a budget event. Keeping them is the best return on staff time you have. They are also the most likely to stay: in FEP’s 2025 data, 69.5% of donors who gave $50,000 or more gave again, against 31.3% of donors who gave $100 or less.
Heavy concentration can also affect public charity status, through the 2% limitation in the IRS 33 percent rule.
A flatter split, such as 70/30, can come from a strong monthly giving program. Many small recurring gifts spread revenue across more donors, which is why recurring givers are worth building a program around.
How to steward the top 20% and grow the rest
For the donors at the top, personal attention pays: a call from the executive director or a board member, a handwritten note, an impact report that shows what their gift did, and an invitation to see the work up close. Write it down as a stewardship plan so it survives staff turnover.
A common mistake is to read the 80/20 rule as permission to ignore the other 80% of donors. They need a plan built for scale. Mid-level donors who have given for several years are your best prospects for larger gifts. An invitation to give monthly turns a one-time donor into a steady one.
Ignite, the Active Intelligence Platform from StratusLIVE, includes 50+ ready-made segments, among them mid-level and major donors, and they refresh daily from the giving record. Once a gift posts and a donor’s giving over the last 12 months crosses into a higher tier, a daily refresh moves them into that segment, with no one rebuilding a spreadsheet. See how list management works.
Where else does the 80/20 rule apply?
The same pattern shows up outside the donor file. A small group of volunteers often gives most of the hours, and a few emails and web pages often bring most of the clicks. The table shows where to look for the vital few in each area and what to do with them.
| Area | The vital few | What to do with them |
|---|---|---|
| Volunteers | The small group that gives most of the hours | Offer lead roles and ask for their ideas |
| Community and members | The people who recruit others and bring them along | Give them roles and public thanks |
| Marketing | The few emails and pages that bring most of the clicks | Find what they share and make more of it |
| Programs | The activities that produce most of the outcomes | Fund them first, and measure the rest |
| Board | The members who open most of the doors | Give them the asks that matter most |
The same test works on fundraising cost: compare what each channel spends with what it raises, then check your fundraising efficiency ratio against peers.
Frequently asked questions
Is the 80/20 rule in fundraising still true?
In pooled data for small and mid-size nonprofits, the split is steeper. In the Fundraising Effectiveness Project's 2025 data, donors who gave more than $500, about one in five, gave 94.1% of the dollars. That data covers 7.8 million donors at 15,102 nonprofits. Your own file may differ, so measure it: total each donor's giving for the last 12 months, sort the list, and count how many donors it takes to reach 80% of revenue.
What is the 80/20 rule for donor communication?
It is a content rule, separate from the revenue rule: about 80% of what a donor hears from you should report impact or say thank you, and about 20% should ask for a gift. Steier Group, a campaign consulting firm, uses a similar 8-to-1 rule. Donors who hear about results between asks have a reason to give again. Count your last ten donor emails and letters to see where you stand.
What is the 80/20 rule for volunteering?
It is the same Pareto pattern applied to volunteer hours: a small share of volunteers gives most of the hours. Pull a year of volunteer hours, sort by person, and find the group that gives 80% of them. Those volunteers are candidates for team lead roles, and many of them are donors or future donors too.
How do I find my top 20% of donors?
Export 12 months of gifts, total them by donor, and sort from largest to smallest. Combine a household's gifts, and credit donor-advised fund grants to the donor who recommended them. Count down the list until the running total reaches 80% of revenue. The donors above that line are your vital few.
Does the 80/20 rule mean a nonprofit should spend 80% on programs?
No. That is a different 80/20, about spending rather than donors. Some boards use it as a target for program spending against overhead, but no federal rule sets that split, and each charity watchdog uses its own line rather than 80/20. Compare your program spending with nonprofits of your size and mission instead of with one number.
Should we ignore the other 80% of donors?
No. The other 80% include the mid-level and monthly donors who become tomorrow's top donors. They need a plan built for scale, such as monthly giving invitations and regular impact updates, rather than the personal attention you give the top 20%. They also bring volunteers and peer-to-peer fundraisers to your events and campaigns.