If you've ever watched a silent auction item crawl from its starting bid to a final price that barely covers its value, there's a good chance the culprit wasn't the item. It was the increment.
Bid increments don't get nearly the attention that starting bids and item selection do, but they quietly control how much money moves through your auction in the time you have. Set them too small and bidders nickel-and-dime an item for twenty minutes without it going anywhere. Set them too large and people feel priced out after two rounds and just stop. Get them right, and you create the thing every auction chair is chasing: a bit of friendly pressure that pushes bidders to keep going.
This guide breaks down what bid increments actually do, how to size them by item value, and where organizations typically get it wrong. Since 2011, we've worked with 10,000+ fundraisers running auctions on GalaBid, and the patterns behind why one item stalls at its starting bid while a similar item in the next campaign sells for triple its estimate almost always trace back to how the increment was set.
What Are Silent Auction Bid Increments?
A bid increment is the minimum amount a new bid has to beat the current one by. If a signed jersey is sitting at a $200 bid with a $20 increment, the next person in has to put in at least $220, not $205, not $210.
Increments exist for a simple reason: without them, bidders would raise each other by a dollar at a time, and you'd need a hundred bids to get an item anywhere near what it's actually worth. The increment is what turns individual bids into meaningful jumps in price.
It's a different lever from the starting bid, which just sets where the bidding opens. Starting bid gets people in the door; the increment decides how fast the price climbs once they're there.
Why Bid Increment Strategy Matters
Increments shape the entire feel of your auction, not just the math. A few things they directly influence:
- How much revenue an item generates. Too-small increments mean an item can sit near its starting bid for most of the night, only spiking in the last few minutes if at all.
- How many people feel comfortable bidding. Increments that are too large relative to an item's value can make guests feel like they need deep pockets just to participate, so they opt out entirely.
- Bidding pace. Well-sized increments create a sense of momentum: each new bid feels like real progress, which keeps people checking back and re-engaging.
- Perceived fairness. Guests notice when increments feel arbitrary or inconsistent across similar items. Consistency builds trust in the process.
Get the increment strategy right and you're not just squeezing out marginally more revenue per item. You're shaping how competitive and enjoyable the whole event feels, which matters for your fundraising target this year and enticing guests to come back again next year.
How to Set the Right Starting Bid
Increment strategy only works properly once the starting bid is in a sensible place, so it's worth a quick word here, though if you want the full breakdown, we've covered starting bids in detail separately.
The short version: most organizations open bidding somewhere between 30 and 50% of an item's fair market value (FMV). Go too low and desirable items can sell for a fraction of what they're worth if bidding doesn't take off. Go too high and you risk scaring off the first bid entirely, and an item with zero bids never gets a second look. Your increment should feel proportionate to wherever you land on that scale, which is what the next section covers.
Recommended Bid Increment Guidelines by Item Value
There's no single "correct" increment. It depends on the item's value, how many bids you want it to take to reach a strong final price, and how quickly you want bidding to move. As a starting framework, most nonprofits set increments somewhere between 5% and 10% of an item's fair market value. The ranges below reflect what we've consistently seen work best across the auctions run on GalaBid over the years, rather than a single rule of thumb applied blindly to every item. This is a good moment to think back to how you sourced and valued the item in the first place, since a well organized auction catalog gives you a much more reliable FMV to build the table below from.
A rough sanity check worth running on any item: if it's taking more than 6 to 8 bids to get an item to around 70% of its FMV, your increment is probably too small and you're leaving money on the table. If an item gets a starting bid and then goes quiet, the increment (or the starting bid) is probably too high for that crowd.
These aren't fixed rules. An item with a lot of natural competition among guests can support a larger increment than the table suggests, and a niche item might need a smaller one to keep any bidding going at all. Applying this table across your whole auction catalog rather than item by item as an afterthought is what actually moves the needle on total revenue.
How Bid Increments Influence Bidder Behavior
There's genuine psychology at work here, not just arithmetic.
Small, frequent increments tend to lower the mental barrier to bidding. A $10 jump feels like nothing, so people bid on impulse, and each new bid becomes a tiny commitment that makes it easier to justify the next one. This is the same "foot in the door" effect that drives momentum in any competitive bidding environment.
Larger increments do the opposite. They raise the stakes of each bid, which can work in your favor on high-value items where you want fewer, more deliberate bids from serious buyers rather than a long, slow crawl. But push the increment too high and you get the reverse effect: bidders disengage because the next step feels like too big a leap to commit to casually.
There's also a herd effect worth knowing about. Items with visible, active bidding attract more bidders, while items that look stagnant get skipped over entirely, regardless of how good the deal actually is. A well-tuned increment keeps the bid count climbing, which keeps the item looking "alive" to anyone browsing.
Common Silent Auction Bid Increment Mistakes
A few mistakes show up again and again, even at auctions that otherwise run smoothly. These are the ones we see most often across the fundraisers we've supported:
- Using one flat increment across every item. A $10 increment might be perfect for a gift basket and completely pointless on a $4,000 travel package.
- Setting increments as a percentage of the starting bid instead of the item's value. These aren't always the same thing, especially if you've deliberately set a low starting bid to attract early interest. Basing the increment on FMV keeps it proportionate to what the item is actually worth.
- Not adjusting mid-auction. If an item is clearly stuck, waiting until the next event to fix the increment wastes the one you're running right now.
- No Buy Now price on high-demand items. For items likely to attract a lot of interest, a Buy Now price (typically 150 to 200% of FMV) gives a motivated bidder a way to end the bidding immediately at a strong price. Without it, that same bidder might just keep pace with the increment instead of jumping ahead.
- Ignoring how increments look on the page. If bidders can't immediately see what the next bid needs to be, you'll get confusion, hesitation, and abandoned bids, especially with paper bid sheets. Clear, well-written item descriptions that state the FMV up front make it much easier for bidders to judge whether a given increment feels fair.
Manual Bid Sheets vs Mobile Bidding
Paper bid sheets are still common, especially at smaller or first-time events, but they make increment strategy harder to manage well. Every increment has to be handwritten on the sheet in advance, changes mid-event mean physically reprinting or crossing out and rewriting, and there's no way to stop someone from writing in a bid that ignores the increment altogether, which then has to be manually resolved by a volunteer.
Mobile bidding platforms remove most of that friction. The increment is built into the item, so bidders simply can't submit a bid below the required minimum. No confusion, no arguments, no volunteer policing bid sheets all night. It also means bidders get real-time outbid notifications, which does a lot of the increment's psychological work for you: a guest who's just been outbid by the minimum increment is far more likely to bid again than one who has to physically walk back over to a table to check.
How GalaBid Manages Bid Increments
In GalaBid increments are set at the item level. When you create an auction item, you set its starting bid and its increment right alongside it, and you can edit either one at any point while the auction is live if an item needs adjusting. That gives you full control to apply the value-based approach above to each item individually, rather than defaulting to one increment for your whole catalog.
Once it's set, GalaBid enforces it automatically on the bidding side: bidders using the bid slider or entering a bid manually can't submit anything below the required minimum, so there's no ambiguity for guests and no manual policing for your volunteers. Real-time outbid notifications keep bidders engaged without you having to do anything further once the increments are in place.
Want to maximize every bid at your next fundraiser? GalaBid's silent auction platform makes it easy to manage bid increments, engage bidders in real time, and run a seamless silent auction that helps your organization raise more. Browse more auction item ideas to pair with a smart increment strategy, or head back to our for silent auction guide for the full picture.
