Is It Better to Bid Early or Late in an Online Auction?

It depends on one rule, and most advice online skips it: how the auction ends. If the auction stops at a fixed second no matter what (a "hard close"), bidding late can genuinely help you. If a late bid pushes the closing time back (a "soft close", sometimes called anti-sniping), the advantage of bidding late mostly disappears, and an early maximum bid is the safer choice. The best-known research on this is clear: the same kind of bidders, buying the same kinds of things, behave very differently depending on which rule they face.

Sniping is a tactic for one kind of auction. Check how the auction ends before you choose when to bid.

Why do people bid at the last second?

Economists Alvin Roth and Axel Ockenfels studied exactly this. In a paper published in the American Economic Review in September 2002, they compared 480 auctions with 2,279 bidders on two sites that ran similar auctions but ended them differently. eBay used a hard close. Amazon's auctions, at the time, kept going until ten minutes passed without a new bid. The data were collected between October 1999 and January 2000, so the sites have changed since, but the comparison still stands because it isolates the one thing that matters here: the ending rule.

They also surveyed 368 eBay bidders who had successfully placed a bid in the final minute of an auction, and about a fifth answered. The reasons late bidders gave were consistent:

• To avoid a bidding war. 91 percent of those who answered said bidding late was part of a plan made early, and most said the point was to keep the price down.
• To hide what they know. Some experienced antiques buyers said an early bid from a known expert tells everyone else the item is worth chasing.
• Because other bidders keep raising. Some people raise their bid a little each time they are outbid, instead of entering one maximum. A last-second bid leaves them no time to respond.

That last point is the key. A late bid works by giving rivals no chance to answer. Take away that silence and the reason to wait goes with it.

Does bid sniping actually work?

On a hard-close site, it changes behaviour a lot. In the 2002 study:

Experience pushed bidders in opposite directions. The more feedback a bidder had, the later they tended to bid on eBay and the earlier they bid on Amazon. In other words, practised bidders learned the rule and adjusted to it.

The follow-up paper, published in Games and Economic Behavior in 2006, set out the theory: in a fixed-deadline auction, bidding late can make sense even for perfectly sensible bidders, but the strategic edge is "severely attenuated" once an automatic extension rule is in place. Sniping is not a trick that beats every auction. It is a response to one particular rule.

More recent data show the habit has not gone away. A 2019 paper by Bryan Lim and Joshua Shemesh cites an earlier study finding that, as of June 2014, more than 40 percent of all bids and more than 60 percent of winning bids on the site studied came in the last tenth of an auction's run.

What are the risks of bidding late?

Even where sniping works, it is not free. The 2002 survey put numbers on the two ways it goes wrong:

1. The bid does not arrive in time. 86 percent of the late bidders who answered said that at least once, they started a bid and the auction closed before it was received.
2. Life gets in the way. About 90 percent said something had come up at least once that stopped them being there at the end as planned.

For both risks, the typical answer was that it happened about one time in ten. The same paper reports that a sniping service of that era said 4.5 percent of its late bids failed to go through in September 2000. Phones and connections are faster now, but the principle is the same: a bid placed in the final seconds is a bid you might lose for reasons that have nothing to do with price.

Is there ever a good reason to wait?

Yes, and it is a better reason than beating the clock. Lim and Shemesh argue that when similar items keep coming up for auction, losing one lot is not a disaster, because another chance is on the way. Holding back keeps your options open: you are not committed to this lot while a cheaper one might close tomorrow.

That idea fits liquidation and return auctions well, where similar items often appear again. But notice what it really means. The smart kind of waiting is across lots, not seconds. Watch a few similar items, see what they actually sell for, and then commit your maximum to the one that suits you. That is very different from hovering over a countdown.

How should you bid on a soft-close auction?

On a site where late bids extend the close, the research points one way: decide your number, enter it once, early, and let the system do the rest. Here is how that works on DealsDMV, taken from our auction FAQ:

• Your maximum is private. You enter the most you will pay, and the site bids for you one step at a time, only when someone bids against you. Other bidders see the current bid, never your maximum.
• You usually pay less than your maximum. You pay just enough to beat the next-highest bidder by one bid step, or the opening bid if nobody else bids.
• Late bids push the close back. A bid in the closing minutes moves the end time so others can answer it. The total extra time is capped, so it cannot run forever.
• Ties favour the early bird. If two bidders set the same maximum, the bid that reached us first leads. On this site, bidding early is not only safer, it can be the tie-breaker.
• Sniping tools are not allowed. Bots and automated bidding tools are against the rules, and a late bid only extends the close anyway.
• A bid that never arrives does not count. If your phone or connection fails in the final seconds, the bid is lost, which is one more reason not to leave it to the end.

A quick checklist before you bid

1. Read how the auction ends. Fixed time, or does a late bid extend it? On DealsDMV, the "Before You Bid" box beside the bid button spells this out.
2. Work out your true limit, fees included. Our buyer's premium calculator walks you through the premium and tax.
3. Check what similar lots went for. Ended auctions show you real results, where they are published.
4. Enter your maximum once. Then stop. Raising it a little at a time is the habit snipers rely on.
5. Walk away if it passes your number. Another similar lot is often coming. We go deeper on this in How to Win an Auction Without Overpaying.

The bottom line

Bid late only when an auction has a hard close, and even then accept that roughly one late bid in ten can fail for reasons outside your control. On a soft-close auction, the research and the rules agree: set your real maximum early and let it work. The waiting that actually saves money happens between lots, by watching prices, not in the last five seconds.

If you are bidding in the DC, Maryland or Virginia area, you can put this into practice on our current auctions, and the online auctions explained page covers proxy bids, sniping and fees in plain words.

Know someone who stays up to snipe every auction? Send them this, it might save them some sleep.