Are "free" calendar fundraiser platforms really free? Donor tips vs. transparent fees

When you shop for a calendar fundraiser platform, the loudest promise is almost always the same: 0% platform fees, 100% free, keep every dollar. It is worth slowing down on that claim, because running software costs money, and on most free platforms that cost is shifted onto your donors rather than removed.

This is a companion to our broader roundup, the best calendar fundraiser platforms in 2026. Here we focus only on the money. Fee figures below are drawn from each provider's own pricing pages as of June 2026; verify current terms before you decide.

Are these platforms really free?

For the organizer, often yes. For the donor and the cause, usually no. Most platforms advertising 0% fees, including Teamfi, Zeffy, and 99Pledges, fund themselves through an optional donor tip presented at checkout. That tip goes to the software company, not your organization. On top of that, payment processing fees always apply, regardless of what the platform charges.

The clearest current example is Zeffy, a broad nonprofit platform sometimes used for calendar-style campaigns. As of June 2026, Zeffy's checkout defaults the donor tip to 17 percent on donations up to $99.49 and 15 percent on larger gifts, and the company states that roughly two of three donors leave a contribution. Teamfi, the most direct calendar competitor, also runs on optional donor tips but advertises a take-home of about 96.6 percent after Stripe's 2.9% + $0.30, with the tip left to the donor.

How the donor tip model works

The mechanics are simple. A donor claims Day 80 of a larger goal and goes to pay $80. The checkout adds a second line, a contribution to support the platform, pre-selected at the default percentage. On Zeffy that default is 17 percent on a gift this size ($13.60). If the donor does not notice or does not change it, they pay $93.60. The $80 reaches your cause; the $13.60 goes to the software company.

The tip is genuinely optional, and that is the platform's defense. The catch is that defaults are powerful and the opt-out can be buried. On Zeffy, declining the tip requires selecting "Other" and manually entering $0, a step many donors miss. So a default tip behaves like a fee your donors pay on the platform's behalf, often without realizing where it goes. Zeffy itself reports that about two of three donors leave a contribution.

What "free" actually costs your cause

Here is the same $10,000 campaign under four scenarios. The processing fee is held roughly constant; the variable is how the platform funds itself.

The tip model's cost is unpredictable by design. It can be near zero if donors decline, or far higher than any reasonable platform fee if they accept a 15 to 17 percent default. For context, Teamfi's own comparison page notes that revenue-share fundraising platforms commonly take 5 to 25 percent off the top, which is $500 to $2,500 on a $10,000 raise. A transparent 3 percent fee is both predictable and, in most cases, the lowest real cost to your cause.

Payment processing is never free

No platform escapes card processing. Stripe and most processors charge about 2.9% + $0.30 per transaction; PayPal-based tools (such as CalendarFundraiser) run closer to 3.5% + $0.49, and a-thon tools like 99Pledges list 3.49% + $0.49. When a platform says "you keep 100%," it means 100% after processing. Teamfi states this plainly: a take-home of about 96.6 percent on a 0% platform fee, because Stripe still takes roughly 3.4 percent. That is honest, and it is also not free. It just is not the part anyone hides.

The transparent fee alternative

MonthFund takes the other approach: a disclosed platform fee instead of a donor tip. It is 3% on the free Community tier, 1% on Professional ($49/mo), and 0% on Network ($199/mo), with 5% for personal accounts. Donors see the fee and can cover it in one click, so your cause receives the full intended gift. Stripe processing is separate and stated plainly.

The point is not that a fee is morally superior to a tip. It is that a disclosed fee is predictable and honest, and a defaulted tip is neither. For organizations that run the model monthly, the subscription path to 1% or 0% can also beat a tip model outright.

Which model raises more?

It depends on donor behavior, which is exactly the problem with the tip model: you cannot plan around it. If your donors reliably decline tips, a tip platform can be cheap. If they accept defaults, you may quietly lose 10 to 15 percent of every gift. A transparent fee lets you model your expected raise and fill rate with a known cost, then promise your board a number you can actually hit.

Questions to ask any "free" platform

• How do you make money? If the answer is donor tips, ask what the default percentage is.
• Does the tip go to my cause or to you? On tip-model platforms, it goes to the platform.
• What is my total cost on a $10,000 campaign if donors leave every default in place?
• Can donors see and choose to cover the cost, or is it presented as a tip to you?

Honest platforms answer all four without flinching. For the full landscape and where each tool fits, read the best calendar fundraiser platforms in 2026, and see the side-by-side fee breakdowns on the comparisons hub.

Next steps

Review MonthFund pricing to see the transparent tiers, model your campaign with the $496 number, and start free when you are ready. Donors should know where their generosity goes; a clear fee is one way to keep that promise.