TLDR
Donor attrition is the rate at which donors who gave in one year do not give again in the following year. The nonprofit sector's average first-year retention rate is approximately 25-30%, meaning most new donors give once and never return.
Donor attrition is the measure of how many donors you lose, expressed as a rate. It tells you how quickly the donor base is eroding — and because it compounds, even a moderate attrition rate creates serious structural problems for organizations that depend on individual giving.
The calculation
Donor attrition rate is the inverse of donor retention rate:
Attrition rate = 100% − retention rate
Where retention rate = (number of donors retained from the prior year / total donors in the prior year) × 100.
Example: an organization has 500 donors in fiscal year 2024. In fiscal year 2025, 215 of those 500 people give again. Retention rate = 215/500 = 43%. Attrition rate = 57%.
The calculation should be applied separately to different donor segments — first-time donors typically attrite at much higher rates than multi-year donors, so a blended number can obscure what is actually happening in the base.
Industry context
Sector-wide data from the Fundraising Effectiveness Project consistently shows:
- First-time donors lapse at 50–60% rates — more than half of first-time donors do not give a second time
- Multi-year donors retain at 60–70% annually — meaning even established donors leave at meaningful rates
- The overall blended donor retention rate across the sector has averaged around 43–46% in recent years
These are averages across organizations of all types and sizes. Well-run individual giving programs achieve notably better retention rates — particularly for mid-level and major donors where personalized stewardship is in place.
The compound effect
A 57% attrition rate sounds bad but looks manageable in year one. After five years, it is catastrophic.
Consider an organization with 500 donors and 43% retention. After one year: 215 retained + new acquisition. After five years of this cycle, the organization has churned through its donor base multiple times. The cost of acquiring 285+ new donors every year — direct mail, digital advertising, event marketing — is substantially higher than the cost of retaining existing donors. Research from the Association of Fundraising Professionals has long established that it costs 5–10 times more to acquire a new donor than to retain an existing one.
Meanwhile, multi-year donors give larger average gifts. A donor who has given for five consecutive years has a higher average gift and a higher probability of making a major gift than a donor giving for the first time. Losing them resets the relationship clock.
Why donors leave
Attrition is rarely because the donor has a negative experience or actively decides to stop supporting the cause. More often, it is passive disengagement:
No acknowledgment. Gifts that are not acknowledged promptly and meaningfully signal to donors that the organization does not need or notice their contribution. A generic form letter is better than silence but not by much.
No communication between asks. Organizations that contact donors only when soliciting create a purely transactional relationship. Donors who hear from the organization only once a year (at ask time) have no connection to maintain. Impact reporting, program updates, and non-ask communications are the difference between a relationship and a subscription.
Donor does not feel the gift mattered. Solicitations that describe the need without ever reporting on outcomes — without saying “here is what happened because you gave” — fail to connect donors to the impact of their gift. Donors want evidence that their contribution did something specific.
Competing causes. Donors with limited charitable budgets make priority decisions. An organization that does not stay present and relevant will be displaced by organizations that do.
Life circumstances. Some attrition is unavoidable — donors move, face financial hardship, or die. For mature organizations with older donor bases, mortality is a real component of attrition that the organization cannot address through better stewardship.
The economics of retention improvement
A small improvement in retention rate creates a large improvement in long-term donor value. If an organization retains 48% of donors instead of 43% — a 5-percentage-point improvement — the compound effect over five years produces significantly more total revenue from the same donor base, with the same acquisition budget.
This is why donor retention is typically described as the highest-ROI investment available to a development team. Retention work — better acknowledgment, impact reporting, mid-year communications, personalized outreach to lapsing donors — costs less than acquisition and compounds in the donor’s lifetime value.
Tracking attrition in a CRM
Meaningful attrition management requires the ability to identify lapsing donors before they have fully churned — to flag donors who gave last year but not yet this year, and trigger outreach before the lapse becomes permanent.
GrantPipe’s donor retention reporting tracks retention and attrition by segment, identifies donors approaching lapse, and surfaces patterns that suggest which cohorts are most at risk. Donor segmentation lets development staff filter by giving year patterns — LYBUNT (gave Last Year But Unfortunately Not This year) and SYBUNT (gave Some Year But Unfortunately Not This year) — to prioritize re-engagement outreach.
For a framework covering donor retention strategy, lapse recovery, and the stewardship communications that reduce attrition, download the Donor Retention Playbook or read the guide on donor retention strategies.
Free resource
Get the Nonprofit Grant Compliance Checklist
A practical checklist for post-award grant compliance: restricted funds, reporting cadence, audit prep, and common failure points. Delivered by email.