The effective giving pledge

In 2009, Toby Ord was a philosopher at Oxford. He decided to cap his own income, initially at £20,000 a year and later revised down to £18,000, and give everything above that to the most effective charities he could find. He calculated this could save thousands of lives over his career without meaningfully reducing his own wellbeing. He took a public pledge to do so, told some friends, and suggested they might consider something similar.

That was Giving What We Can, launched in November 2009. Fifteen years later, more than 11,000 people have taken the 10% Pledge. The community has donated over $369 million directly and moved more than $566 million to high-impact charities. The retention picture is more sobering than the founding story suggests: GWWC's own 2023-2024 impact evaluation found only about 30% of pledgers are still recording donations on its platform five years after starting.

How the pledge works

The 10% pledge. You commit to donating at least 10% of your income to the organisations you believe can do the most good with it. The pledge is for life, or at least until retirement. It's not legally binding (no enforcement mechanism), but it is a public, recorded commitment. Your name goes on the member list. You report your donations annually.

Try Giving. If 10% feels too steep to start, Giving What We Can offers Try Giving: pledge any percentage for any time period. 1% for a year. 5% for six months. It's an on-ramp designed to lower the barrier. Many people start with Try Giving and graduate to the full pledge once they've experienced that giving 10% doesn't actually hurt.

The Further Pledge. For those who want to go beyond 10%, the Further Pledge commits everything above a living wage (the amount varies by country). This is what Toby Ord originally took. A small but meaningful number of GWWC members have taken it.

Why 10% works psychologically

The number isn't arbitrary. It's calibrated to be ambitious enough to feel meaningful but sustainable enough to maintain for decades.

Historical precedent. The tithe (10% of income given to the church or community) appears across cultures and centuries: Judaism, Christianity, Islam, Sikhism. The idea that giving a tenth is both generous and survivable is deeply embedded in human moral intuition. GWWC builds on this existing cultural norm rather than inventing a new one.

Above the threshold of sacrifice. A small, occasional donation rarely changes how you see yourself. A standing commitment large enough to show up in your monthly budget tends to. At 10%, giving becomes part of who you are, not just something you do occasionally. The commitment is large enough to reshape spending habits.

Below the threshold of hardship. For most people earning above median income in developed countries, 10% doesn't require lifestyle sacrifice. It requires budget adjustment. You eat out slightly less frequently. You buy fewer things you don't need. You drive a slightly older car. The UK median income after tax is roughly £31,000. Giving £3,100 per year is meaningful, but it doesn't prevent you from paying rent, raising children, or saving for retirement.

The community effect

The pledge isn't just an individual commitment. It's membership in a community. This matters more than most people expect.

Social identity theory. Tajfel and Turner's framework (1979) predicts that group membership shapes behaviour even when groups are minimal. The GWWC community is not minimal: there are local groups, an annual conference, a Slack workspace, public discussion forums, and a shared identity as "effective givers." Once you've publicly identified as a pledger, defecting feels like betraying a group, not just breaking a personal resolution.

Accountability without enforcement. GWWC asks members to report donations annually. Nobody checks your bank statements. Nobody calls you if you miss a month. But the act of reporting creates soft accountability. You're reminded of the pledge regularly, you see others' donations, and the dashboard shows your lifetime giving total growing. The design is closer to a fitness tracker than a contract.

Retention data. GWWC's 2023-2024 impact evaluation found about 30% of pledgers still recording donations on its platform five years after starting. The organisation is candid that this is an imperfect measure, since reporting is encouraged but not required, but its surveys of non-reporting pledgers did not find a strong signal that most of them are quietly still giving. Recorded giving is a floor, not the whole picture, but the honest read is that a meaningful share of pledgers drop off over time. Even so, a lifelong public commitment outperforms the ad hoc giving most people default to.

The money moved

The raw numbers are striking for what started as one philosopher and a few friends.

Over half a billion moved. GWWC reports more than $566 million moved to high-impact charities by its community, with over $369 million of that donated directly through recorded 10% and Trial Pledges. (The often-quoted "$3 billion" figure is GWWC's long-term goal of one million pledgers giving $3 billion annually, not money already moved.) A significant portion of pledged giving is still future commitment, people early in their careers who will donate over decades.

Where it goes. GWWC doesn't direct members' donations to specific charities (unlike a DAF or pooled fund). Members choose their own recipients. But the community heavily indexes on GiveWell-recommended charities, animal welfare organisations recommended by Animal Charity Evaluators, and longtermist organisations. The most common recipients: Against Malaria Foundation, GiveDirectly, Malaria Consortium, GiveWell Maximum Impact Fund.

The counterfactual question. Would these people have donated anyway? Partially, yes. People who take the GWWC pledge are self-selected for altruistic inclination. But GWWC's internal surveys suggest the pledge increases giving by roughly 2-3x compared to what members estimate they would have given without it. For a typical member earning £50,000, that's the difference between giving £1,500 (general altruistic inclination) and £5,000 (pledge commitment).

Common objections

"I can't afford 10%." The median UK income is roughly £31,000 after tax. Giving £3,100 per year is possible for most people at this level, but genuinely difficult for those with high housing costs, childcare, or debt. Try Giving exists for exactly this reason. Start at 1%. Increase when you can. The point is the direction, not the destination.

"What if my circumstances change?" The pledge includes a hardship clause. If you face unemployment, disability, or caregiving responsibilities that make 10% unsustainable, you can pause or reduce without guilt or judgment. GWWC explicitly states this in their pledge documentation.

"Isn't this just virtue signalling?" The annual reporting requirement means you either donate or you don't. There's nowhere to hide. Public pledges are more binding precisely because they're public: the reputational cost of publicly committing and then not following through creates genuine accountability. If virtue signalling means "publicly committing to a behaviour and then actually doing it," that seems fine.

"Why effective charities specifically?" The GWWC pledge doesn't technically require donations to effective charities. It asks you to give to "the organisations that can do the most good." This allows for genuine moral uncertainty. If you believe animal welfare is most important, your pledge goes there. If you believe global health, it goes there. The pledge is about the commitment to give, not about any single definition of "effective."

The compounding effect

A 25-year-old who takes the pledge and earns the UK median income for their career will donate roughly £100,000-150,000 over their working life. If they earn above median (and most pledge-takers do, given the demographic skew toward educated professionals), the figure is £200,000-500,000.

Directed to GiveWell's top charities at current cost-effectiveness estimates, £200,000 saves roughly 50-100 lives over a career. From one person's 10%. Not from extreme sacrifice. From a budget adjustment maintained over time.

The compound effect applies to the community too. Over 11,000 members today. GWWC's stated long-term goal is one million pledgers directing $3 billion a year to high-impact charities. Even a fraction of that scale would mean the movement directing billions annually to effective charities.

How to start

Option 1: Take the pledge now. Visit givingwhatwecan.org/pledge. Fill in the form. Takes 2 minutes. You're committed.

Option 2: Try Giving first. Same website, choose "Try Giving." Pick a percentage and duration you're comfortable with. Treat it as an experiment. Most people who try discover 10% is more manageable than they expected.

Option 3: Start giving, decide on pledging later. Set up a standing order to GiveWell's Maximum Impact Fund or any effective charity. Track your giving. When you're ready to make it official, the pledge is there.

The pledge isn't magic. It's a commitment device built on public accountability, community identity, and the simple human desire to be the kind of person who follows through. It works because it turns good intentions into structural behaviour change.

One sentence

The Giving What We Can pledge turns charitable giving from an occasional good intention into a lifelong commitment, with over 11,000 members and more than $566 million moved, though its own data shows holding pledgers over the long term is the real challenge.

Sources

1. Our community (Giving What We Can): 11,006 lifetime 10% Pledge members, $369m donated, $566m moved, accessed June 2026
2. 2023 to 2024 Impact evaluation (Giving What We Can): ~30% of pledgers still recording donations at 5 years, accessed June 2026
3. Our history (Giving What We Can): launched November 2009, accessed June 2026
4. Toby Ord (Wikipedia): income cap of £20,000, later revised to £18,000, accessed June 2026
5. Giving What We Can (Wikipedia): founded 2009 with 23 members, accessed June 2026
6. The 10% Pledge (Giving What We Can), accessed June 2026

Keep reading

Get the next one in your inbox. Every Tuesday. Free.