Silent auction rules are a two-layer system: what bidders see, and what your team does when things get complicated.
- Set clear bid increments, a firm close time, and a full-payment-before-collection rule on every bid sheet.
- Gift Aid does not apply to auction lots at fair value; only a clearly-labelled voluntary donation on top can qualify.
- Use mobile bidding to auto-charge winners at close and send outbid notifications, no checkout queue.
- A Temporary Event Notice is required if you are selling alcohol at the event; add a raffle and you need to register a small society lottery.
- Zeffy's auction software is 100% free for UK charities: no platform fee, no transaction fee, ever.
Silent auction rules are a two-layer system. The first layer is what bidders see: the signage, the bid sheets, the close time, the increments. The second layer is what your staff and volunteers actually do when someone gets outbid by £5, when two bidders tie, or when a winner walks out unpaid. The difference between a clean fundraiser and a Monday-morning payment-chasing scramble is whether your rules cover both layers, and whether your software enforces them for you.
This guide gives you 12 bidder-facing rules, a free copy-paste template, mobile bidding guidance, a do's and don'ts cheat sheet, volunteer protocols, and the legal basics for UK charities. Use what you need.
In this article:
What are silent auction rules, and why do they matter?
Silent auction rules are the published terms that govern how bidders register, how bids advance, when bidding closes, how winners pay, and how lots are released. Clear rules do three things: they build bidder confidence (people bid higher when they trust the process), they reduce disputes at checkout, and they give your volunteers a script when something gets complicated.
These rules apply whether you are running a paper bid sheet auction with clipboards on tables or a mobile bidding setup where guests bid from their phones via a QR code. The legal and operational principles are the same. The enforcement mechanics are not, which is why we cover both below.
12 essential silent auction rules for bidders
These are the rules that belong on your signage, your bid sheets, and the first screen of your mobile bidding form. Use them verbatim or adapt the language in the template further down.
1. Bidder registration is required
Every bidder must register with a name, email address, phone number, and (for mobile bidding) a payment method on file before placing any bid. Registration is what lets you contact winners, charge cards automatically at close, and prove that a bid was placed in good faith if a dispute arises later. Under UK GDPR you must have a lawful basis for storing bidder data and a clear retention period; state both in a short privacy notice at registration (refer to ICO guidance for the detail).
2. Bidding starts and ends at the times posted
Publish exact start and end times on every bid sheet and every piece of signage. Common practice is two to three hours for an in-person silent auction and seven to fourteen days for an online-only auction. Late bids are invalid, no exceptions. This rule only works if you enforce it.
3. Bids must meet the minimum increment
Set a minimum increment per item or per price tier. A common convention is £5 for lots under £100, £10 for lots £100 to £500, and £25 for lots above £500. If the increment is £10 and the current bid is £50, the next valid bid must be at least £60. Bids that do not meet the increment are disqualified.
4. Starting bids reflect fair market value
Starting bids are typically set at 40 to 50% of fair market value (more on FMV below). This gives bidders room to climb while protecting the lot from selling for too little. The FMV is printed on the bid sheet so bidders know what they are paying for. Gift Aid cannot be claimed on the lot itself; only a clearly-labelled additional voluntary donation on top of the lot price can be Gift Aid eligible.
5. Bidders may bid on as many lots as they want
There is no cap on how many lots a single bidder can win unless you have set one for a specific category (see Rule 9). Multiple bids per person drive up final sale prices and give your top supporters room to compete.
6. All bids and sales are final
Once a bid is placed, it cannot be retracted. Once the auction closes, the highest bid is the sale. No refunds, no exchanges, no 'I changed my mind.' State this on every bid sheet and on signage near the lots.
7. Winning bidders pay in full at the close of the auction
No deferred payments, no 'I'll post a cheque next week.' Winners pay before they leave with the lot, by card (debit or credit), contactless, mobile wallet, or cash. Offer tap-to-pay via phone for any bidder who needs to pay on the spot. If you are running mobile bidding with a card on file, the platform charges winners automatically the moment the auction closes.
8. Proxy and absentee bidding (if offered)
If you allow absentee bidders to submit a maximum bid in advance, publish the cutoff time (typically 24 hours before the auction opens) and the format. Be clear about whether the platform will incrementally bid on their behalf or whether their maximum bid is simply entered as a single bid at the start.
9. Disclosed limits apply where noted
Some lots, such as alcohol packages, experience trips, and lots with capacity caps, may carry per-bidder limits. List them on the item card so no one is surprised at checkout.
10. Age restrictions are enforced
Bidders must be 18 or over to bid on and win any alcohol lot (Licensing Act 2003). Volunteers will check ID at collection for any age-restricted lot. Note this on the item description, not buried in small print.
11. Bidders assume the risk of their bids
Lots are described to the best of the organiser's knowledge, but the charity makes no warranty. Include a short assumption-of-risk disclaimer in the rules. This is standard auction language and protects your organisation from disputes over lot condition.
12. Items are sold as-is
No guarantees, no warranties, no returns. Describe each lot's condition honestly in the catalogue and on the bid sheet to set expectations up front.
How to set fair market value on UK auction lots
Fair market value (FMV) is the price a willing buyer would pay a willing seller for an item in its current condition. Your bidders use it as the anchor for how much to bid, and your trustees need it for the annual return.
To research FMV, find three comparable listings, retail prices for new goods, completed eBay sales for collectibles, or hotel rate cards for experience packages, and use the median. Document your sources.
For starting bids, the common convention is 40 to 50% of FMV. A signed sports shirt with a £150 retail value gets a £60 to £75 starting bid. That gives bidders room to climb without leaving money on the table.
Gift Aid and auction lots, a critical point UK charities often get wrong. HMRC treats auction lots as goods or services received in return for payment, so Gift Aid does not apply to the lot price. The Charity Tax Group confirms this position for charity auctions. Only a clearly-labelled additional voluntary donation added on top of the winning bid, where the donor signs a Gift Aid declaration and has paid sufficient UK tax, can qualify. If you want to offer this option, design your checkout process to separate the lot payment from any voluntary donation clearly.
Trustees should record FMV and gross auction receipts in the charity's annual return and Trustees' Annual Report and Accounts (TAR). The Charity Commission for England and Wales, OSCR, and CCNI all expect fundraising income to be accounted for properly in the TAR.
Mobile bidding rules vs. paper bid sheet rules
The rules do not change. The enforcement does. Here is where the mechanics diverge:
- Registration: Paper auctions can let walk-ins write their name on a sheet. Mobile bidding requires registration with a phone number and (usually) a card on file before the first bid lands. That is stricter, but it is also why mobile checkout takes seconds instead of an hour.
- Outbid notifications: Paper bidders have to walk back to the table to see if they have been outbid. Mobile bidders get an email the moment they are outbid, which is what keeps bidding wars going past the casual first round.
- Bid increments: On paper, increments are enforced by your volunteers crossing out invalid bids. In a mobile bidding form, the increment is built into the input. Bidders cannot submit a number below the next valid bid.
- Closing time: Paper auctions need a volunteer to stand at each table and call the close. Mobile auctions close at the exact second, automatically, with everyone seeing the same countdown.
- Checkout: Paper auctions require a checkout queue where winners pay one by one. Mobile bidding charges the card on file at close and emails the receipt. No queue.
If you are running a hybrid setup, some lots on paper, some on mobile, publish two rule sheets so there is no confusion about which set of mechanics applies where.
UK gala context. At higher-ticket events (typically £50 and above per head), mobile bidding has become the norm at UK charity galas. Platforms such as Givergy and GalaBid are well established at this end of the market. For small-to-mid UK charities running school PTA auctions, community fetes, or church fundraisers, the cost of gala-tier mobile bidding platforms can outweigh the benefit. Zeffy offers free mobile bidding for UK charities with no platform fee and no transaction fee, making it a practical option for organisations that need the technology without the price tag.
Silent auction do's and don'ts
The rules above are what bidders see. These are the operational habits that separate clean events from chaotic ones.
Do
- Do recruit one volunteer per 20 to 30 bidders. Spread them across registration, the lot tables, and checkout. Under-staffing is the most common cause of difficult auction nights.
- Do post the close time in three places. Signage at the entrance, signage at each lot table, and a verbal announcement 15 and 5 minutes before close.
- Do offer at least two payment methods. Card and mobile wallet at minimum. Cash is optional but adds reconciliation work.
- Do offer tap-to-pay on a phone for door collections and unpaid winners. Supporters are increasingly unlikely to carry cash. Contactless and mobile wallet cover the gap.
- Do run a preview period. Open lot viewing 30 to 60 minutes before bidding starts so guests can plan their bids.
- Do print backup bid sheets even for mobile auctions. If the Wi-Fi drops, you will need them.
- Do announce closing warnings. 30 minutes, 15 minutes, 5 minutes. This is when the biggest bidding contests happen.
Don't
- Don't over-procure lots. Twenty great items beat sixty mediocre ones. Bidders spread thin across too many lots leave money on the table.
- Don't skip the preview period. Bidders who have not seen a lot will not bid aggressively on it.
- Don't let winners walk out unpaid. Card on file or payment-before-collection. Always.
- Don't change the rules mid-event. If you publish a £10 increment, do not accept a £5 bid because someone asked nicely. It undermines the whole evening.
- Don't forget the closing warnings. A silent close kills your final-minute bidding surge.
- Don't bury the FMV. Print it on the bid sheet next to the starting bid so bidders understand the lot's value and what Gift Aid does and does not cover.
Rules for auction volunteers and staff
Your bidder-facing rules only work if the people running the event know how to enforce them. Train volunteers on these protocols before the doors open.
Training your team
Walk every volunteer through the rules sheet at least once before the event. Assign specific roles: registration, lot-table monitors, checkout, and a floater who handles disputes. Give each role a one-page cheat sheet with the most common scenarios and how to respond.
Handling bidding disputes
The most common dispute: two bidders claim the same final bid (more common on paper than mobile). The rule of thumb is that the bid with the earlier timestamp wins. If timestamps are not visible, the bid written higher on the sheet wins. State your tiebreaker rule in advance and apply it consistently.
Managing the checkout queue
If you are running paper, expect 30 to 60 minutes of checkout for a 100-guest event. Stagger collection by table or lot category to avoid one long queue. If you are running mobile with auto-charge, checkout becomes 'show your email confirmation, collect your lot', but you still need someone at the door verifying.
When a winner's payment is declined
For paper auctions: ask the winner to re-attempt with a different card or method on the spot. If they leave without paying, the lot goes to the next-highest bidder (publish this in your rules). For mobile auctions with a card on file: the platform retries the charge automatically, and you have an email trail to follow up. Either way, document everything.
Handling bidder data on the night
Volunteers should not photograph bid sheets on personal phones. Paper registration slips should be shredded after reconciliation. The charity's retention policy should cover how long the mobile bidding platform's export is kept. The Fundraising Regulator Code of Fundraising Practice (current version effective 1 November 2025) includes obligations on how donor and bidder data is handled; the Code's data section applies to all charities and third-party fundraisers operating under it.
Regulation and compliance for UK silent auctions
UK charities operate across three separate charity-law jurisdictions. A charity registered in England and Wales with the Charity Commission (CCEW) must register separately with OSCR before fundraising in Scotland. Charities in Northern Ireland register with CCNI. Always confirm which regulator(s) apply to your activities.
This section is general information, not legal or tax advice. Consult a solicitor and a qualified accountant for guidance specific to your charity.
- Fundraising Regulator Code. Charity silent auctions fall under the Fundraising Regulator Code of Fundraising Practice (effective 1 November 2025). The Code's principles of being legal, open, honest, and respectful apply to how you run the auction, how you describe lots, and how you handle bidder data. Section 9 of the updated Code covers online platforms and applies where mobile bidding or online auction tools are used.
- Alcohol licensing. If you are selling or serving alcohol at the event, you will likely need a Temporary Event Notice (TEN) under the Licensing Act 2003, obtained from the local licensing authority. Auctioning alcohol lots for later redemption is generally separate from the TEN requirement, but ID checks apply at collection for any age-restricted lot. Check with your local authority well in advance.
- If you add a raffle alongside the auction. A raffle where tickets are sold to the public is a lottery under the Gambling Act 2005. If the draw does not take place entirely at the event, you will need to register a small society lottery with your local council (£40 initial fee, £20 annual renewal). There is no cap breach for most small charity events, but you must ensure at least 20% of proceeds go to the cause and the maximum single prize does not exceed £25,000. If the draw takes place entirely at the event (an incidental non-commercial lottery), no registration is required. See the Gambling Commission guidance on small society lotteries.
- UK GDPR and PECR. You need a lawful basis (typically consent or legitimate interest) for processing bidder personal data. Under the Privacy and Electronic Communications Regulations (PECR), marketing follow-up to bidders after the event requires the appropriate consent or opt-in. Refer to ICO guidance for the detail.
- Liability and event insurance. For experience-based lots (skydiving, sporting activities), require the donor of the experience to handle their own liability waiver at redemption. Check whether your existing charity insurance covers the event; if not, a one-day event policy is generally affordable.
- Trustees' duties. The auction is a fundraising activity trustees are responsible for. Record income properly in the annual return and Trustees' Annual Report and Accounts (TAR) filed with your regulator.
7 best practices for running a successful silent auction
Rules keep the event clean. These habits make it profitable.
- 1. Start planning at least 90 days out. Lot procurement is the longest lead time in auction planning. Begin outreach to donors and local businesses three months before the event so you have time to chase the high-value lots.
- 2. Offer a curated mix of lots. Aim for a spread: a few high-ticket experiences (£500 and above), a solid middle tier (£100 to £500), and accessible silent auction lots under £100 so every guest can win something.
- 3. Make bidding effortless. Mobile bidding from a phone via QR code removes the biggest friction in the process: walking back to a table. If you are running paper, invest in clean, well-designed silent auction bid sheets with the rules printed at the top.
- 4. Stage the room intentionally. Group lots by category, light them well, and put your highest-value lots in the highest-traffic spots. Use printed signage to explain the rules and the close time. Do not rely on verbal announcements alone.
- 5. Promote the auction before the event. Send a save-the-date four to six weeks out, a preview email with the catalogue two weeks out, and a final reminder the day of. Guests who have seen the catalogue before they arrive bid faster and higher.
- 6. Always follow up. Thank-you emails to bidders (winners and non-winners), recognition for lot donors, and a post-event impact recap to everyone. Follow-up is where next year's auction is built.
- 7. Set a realistic revenue goal. A rough planning benchmark: total FMV of your lots multiplied by 0.6 to 0.8 equals expected gross revenue. If your lots total £15,000 in FMV, plan for £9,000 to £12,000 in gross. Set your fundraising target inside that band.
Free silent auction rules template
Copy the block below into a Google Doc or your event signage. Replace the bracketed fields with your details. A short mobile-bidding-specific version follows it.
[Your Charity's Name], Silent Auction Rules
Welcome to our silent auction. Please read the rules below to ensure a fair and enjoyable experience for everyone.
1. Bidding period. Bidding begins at [start time] on [start date] and ends at [end time] on [end date]. Bids placed after the close are invalid.
2. Registration. All bidders must register with name, email address, and phone number before placing any bid. Mobile bidders must also provide a payment method on file. A short privacy notice explaining how we hold your data is available at the registration desk.
3. Fair market value. Each lot's FMV is printed on the bid sheet. Starting bids are set at approximately 40 to 50% of FMV. Gift Aid does not apply to the lot price; a separate voluntary donation box is available at checkout for those who wish to add a Gift Aid eligible contribution.
4. Minimum bid increment. Bids must meet the minimum increment of [amount] per lot, or the increment listed on the lot card. Bids below the increment are disqualified.
5. Multiple bids. Bidders may bid on as many lots as they wish. Each new bid must exceed the previous bid by at least the minimum increment.
6. Finality of bids and sales. All bids and sales are final. No refunds or exchanges.
7. Payment obligation. Winning bidders agree to pay in full at the close of the auction by [accepted payment methods: card, contactless, mobile wallet, or cash]. Mobile bidders' cards on file will be charged automatically at close.
8. Tiebreaker. In the case of a tie, the bid with the earlier timestamp wins.
9. Limitations. Per-bidder limits may apply to specific lots, as noted on the lot card.
10. Age restrictions. Bidders must be 18 or over to bid on and win lots marked as age-restricted (for example, alcohol packages). ID will be verified at collection.
11. Assumption of risk. Bidders assume all risk related to auction lots and the bidding process. [Your Charity] makes no warranty regarding lot condition.
12. As-is condition. All lots are sold as-is. Please review descriptions before bidding.
Thank you for supporting [Your Charity's Name]. Questions? Contact [name] at [email or phone number].
Enjoy the auction.
Short version for mobile bidding only: Bidding opens [time/date] and closes [time/date]. Register your name, email, phone number, and card before bidding. Minimum increment is [amount]. Cards on file are charged automatically at close. All bids and sales final. Lots sold as-is. Questions? Contact [name].
How Zeffy makes silent auction rules easy to enforce
A small UK charity running a gala currently pays Givergy or GalaBid for mobile bidding, JustGiving for donations, and a CRM on top. Most of the rules in this guide only work if someone enforces them in real time. With Zeffy's free auction software, your rules become form settings, and the platform handles enforcement for you.
- Minimum increment rule: the form enforces it. Set the per-lot increment when you build the auction. Bidders cannot submit a number that breaks the rule.
- Full payment at close: cards saved on first bid, auto-charged at close. Winners' cards are charged automatically the moment the auction ends. You will not have to chase bidders on Monday morning.
- Outbid notification: automatic email alerts. When a bidder is outbid, they receive an email instantly. (Email only. Zeffy does not send SMS outbid notifications, so set guest expectations accordingly.)
- No-app friction: mobile-web bidding via QR code. Guests scan a QR code and bid from their browser. No app download required.
- Close-time rule: automatic close. The auction closes at the exact second you set. No volunteer needs to call it.
A few honest limits: each Zeffy auction form holds up to 50 lots, the platform does not run absentee proxy bidding on a bidder's behalf (bidders place their own bids; the increment is enforced at each step), and there is no buy-now option. Plan around those before launch. For setup details, see the support articles on configuring an auction page and how winners are charged.
Zeffy is 100% free for charities. No platform fee, no transaction fee, no credit card fee. Ever. More than 100,000 organisations have raised over £2 billion on the platform, with every pound in fees saved going straight back into their programmes.
Frequently asked questions
Can bidders claim Gift Aid on a silent auction lot?
No. HMRC treats auction lots as goods or services received in return for payment, so Gift Aid does not apply to the lot price itself. This is one of the most commonly misunderstood points for UK charities running auctions.
separately-labelled voluntary donation added on top of the winning bid can be Gift Aid eligible, provided the donor signs a Gift Aid declaration and has paid sufficient UK Income or Capital Gains Tax in the tax year. Higher-rate and additional-rate taxpayers can claim the difference between basic rate and their rate through Self Assessment for any legitimate Gift Aid element. Keep the lot payment and any voluntary donation clearly separated in your checkout process and records.
Do I need a licence to run a silent auction in the UK?
There is no specific auction licence required for a straightforward charity silent auction in the UK.
However, if you are selling or serving alcohol at the event, you will likely need a Temporary Event Notice (TEN) from your local licensing authority under the Licensing Act 2003. Apply well in advance, as there are limits on the number of TENs a premises can receive in a year.
If you add a raffle or prize draw alongside the auction, that element falls under the Gambling Act 2005. Unless the draw takes place entirely at the event (an incidental non-commercial lottery, which requires no registration), you will need to register a small society lottery with your local council. See the Gambling Commission guidance for the rules and thresholds.
Charities registered in England and Wales that are fundraising in Scotland must also be registered with OSCR. Check with your local licensing authority and your charity regulator for guidance specific to your circumstances.
What happens if two bidders tie on the same lot?
The bid with the earlier timestamp wins. On a paper bid sheet, that means the bid written higher on the sheet (earlier in the sequence) wins. On a mobile bidding platform, timestamps are recorded automatically. State your tiebreaker rule clearly in your published rules and apply it consistently. Do not make exceptions.
What if a winner refuses to pay or their card is declined?
Publish your payment enforcement rule before the auction: winning bidders agree to pay in full at close, and the lot goes to the next-highest bidder if the winner cannot or will not pay.
For paper auctions, ask the winner to re-attempt with a different card or method on the spot. Document the outcome either way.
For mobile auctions with a card on file, the platform retries the charge automatically. You have an email trail to follow up. If the charge ultimately fails, contact the winner directly and, if unsuccessful, award the lot to the next-highest bidder. Keep records for the annual return.
How many lots should I include in my silent auction?
Quality over quantity. Most charity silent auctions perform better with 15 to 25 well-chosen lots than with 60 mediocre ones. When bidders are spread too thin across too many lots, bidding is lighter and final prices are lower.
Aim for a mix: a few high-value experiences (£500 and above), a solid middle tier (£100 to £500), and accessible lots under £100 so that every guest has a realistic chance of winning something. A tightly curated selection also makes the room easier to manage for your volunteers.
How do I write good lot descriptions for a silent auction?
Each lot description should include: the item or experience name, a brief factual description, the fair market value (FMV), any restrictions (expiry dates, blackout dates, geographic limits, age restrictions), the starting bid, and the minimum increment. For experience lots, add the redemption process and any liability notes.
Be accurate and honest. Overstating a lot's value or omitting restrictions leads to disputes at checkout and damages trust with your supporters. For items where condition matters (art, collectibles, second-hand goods), note the condition clearly. Descriptions that set accurate expectations result in higher bidder confidence and better final prices.
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