Survey incentives guide: what to offer, when, and what to avoid
Survey incentives raise response rates but can bias your sample if chosen carelessly. The main types are prize draws (lotteries), guaranteed small rewards, gift cards, discounts on your own product, charitable donations, and sharing the results. Use guaranteed rewards when you need every targeted person to respond, draws when budget is tight and the audience is large, and your own discount when respondents are already customers. Avoid incentives large enough to attract people who'll rush or fake answers just to claim the reward.
Do survey incentives actually work?
Generally, yes — offering something in return for completion tends to raise response rates, especially for longer surveys or audiences with no relationship to you. But the goal isn't the highest response rate; it's a representative sample of thoughtful answers. A large cash incentive can backfire by drawing in people who race through the questions or submit garbage to claim the reward. The right incentive nudges the people you actually want without distorting who responds or how carefully they answer.
Types of survey incentives
Prize draw (lottery)
Everyone who completes is entered to win one larger prize. Cheap relative to reach, which makes it the default for big audiences. The downside: the expected value to any individual is low, so it motivates less than a guaranteed reward, and draws can carry legal requirements (rules, eligibility, sometimes a no-purchase-necessary clause) depending on where you operate.
Guaranteed reward
Every completer gets something — a small gift card, account credit, or digital good. The strongest motivator and the best choice when you need a specific, named group to respond. Cost scales directly with response count, so it suits smaller targeted lists rather than open public surveys.
Discount on your own product
A coupon or credit toward what you already sell. Cheap for you, and it doubles as a retention nudge — but it only motivates existing or prospective customers, and it can skew your sample toward people who want the discount rather than people with something to say.
Charitable donation
You donate a fixed amount per completed response, or let respondents pick a cause. Avoids the greed signal of cash and fits mission-driven or nonprofit audiences well. Motivation is softer than a personal reward, so pair it with a survey people already feel good about completing.
Early access or exclusive content
A report of the aggregate results, a beta invite, or gated content in exchange for completion. Costs almost nothing and attracts respondents who genuinely care about the topic — which is exactly the bias you want for research surveys.
Which incentive should you use?
| Incentive | Best for | Caution |
|---|---|---|
| Prize draw (lottery) | Large audiences, tight budget, public surveys | Low individual motivation; check local rules for draws and eligibility |
| Guaranteed reward | Small, named lists where you need high response from specific people | Cost scales with every response; can attract rushed completions if too large |
| Gift card | B2B research, hard-to-reach professionals, longer surveys | Big amounts draw fraudulent or careless responses; verify completion quality |
| Discount on your product | Existing-customer feedback, post-purchase surveys | Skews sample toward people who want the deal, not the most representative voices |
| Charitable donation | Nonprofit, mission-driven, or community audiences | Softer motivator; weak on audiences with no affinity for the cause |
| Early access / results report | Research and product surveys with an engaged audience | Only motivates people who care about the topic; weak for cold lists |
Match the incentive size to the effort, not the other way around. A 10-question, 3-minute survey doesn't need a $50 gift card — and offering one practically invites people to speed-run it for the reward. Calibrate the incentive to the time you're asking for, then watch completion quality, not just completion rate.
When should you skip incentives entirely?
Plenty of surveys do better without them. If your audience already has a stake in the outcome — engaged customers, employees who want change, event attendees while the experience is fresh — a clear explanation of why their input matters often outperforms a token reward, and it doesn't attract reward-chasers. Skip incentives when the topic is intrinsically motivating, when the audience is small and invested, or when an incentive would muddy who responds.
How to run incentives without skewing your data
- 1Keep the reward proportional to the time you're asking for
- 2Separate the incentive collection from the survey answers so reward-claiming doesn't link to (or bias) responses on anonymous surveys
- 3Add an attention check or two on longer surveys to catch people rushing for the reward
- 4State the incentive and how to claim it clearly in the introduction and on the thank-you screen
- 5For draws, write down the rules, eligibility, and how winners are picked before you launch
On an anonymous survey, an incentive that requires an email creates a tension: you've promised not to identify people, but you need contact details to send the reward. The clean fix is a separate, clearly optional field at the very end where respondents can volunteer contact details for the reward only, kept apart from their answers. In Formkii you can collect responses anonymously and add an optional contact field, then export the data to see exactly what's linked to what.
Frequently asked questions
Do incentives bias survey results?
They can. Incentives that are too large attract people who rush or fake answers to claim the reward, and product discounts skew the sample toward deal-seekers. Keep the reward proportional to the effort, add attention checks on longer surveys, and watch completion quality rather than only the response rate.
What is the best survey incentive?
There's no single best one — it depends on the audience. Guaranteed small rewards work best for short, named lists where you need specific people to respond; prize draws suit large audiences on a tight budget; and your own product discount fits existing customers. Match the incentive to who you need and the effort you're asking for.
How much should a survey incentive be worth?
Enough to acknowledge the respondent's time, not enough to make the reward the reason they answer. Calibrate it to survey length — a few minutes warrants a token reward or draw entry, while a 20-minute B2B research survey may justify a meaningful gift card. Oversized incentives invite careless or fraudulent responses.
Can I run a prize draw for an anonymous survey?
Yes, but keep the contact details separate from the answers. Add a clearly optional field at the end where respondents can enter their email for the draw only, stored apart from their survey responses, so anonymity holds while you can still notify a winner. Always document the draw rules before launch.