Silent auction rules are a two-layer system: what bidders see, and what your volunteers do when things get complicated on the night.
- Publish clear rules covering registration, bid increments, close time, payment, and item collection, then use software that enforces them so your volunteers don't have to argue with donors.
- Set minimum increments by price tier (a common convention is $5 under $100, $10 for $100 to $500, $25 above $500) and print market value on every bid sheet.
- Fundraising in Australia is regulated state-by-state: check whether you need a fundraising authority and get a temporary liquor licence if you're serving or auctioning alcohol.
- Auction purchases are not tax-deductible in Australia because the bidder receives a benefit, even when your charity is DGR-endorsed. The narrow exception is a contribution at a DGR fundraising event where the bidder knowingly pays above market value; that excess may be deductible under Division 30 of the ITAA 1997.
- Not sure where to start? Justice Connect's Not-for-profit Law has free plain-English guides at nfplaw.org.au, and donors can verify your DGR status on ABN Lookup at abr.business.gov.au.
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 AU legal basics. Use what you need.
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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 items 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're 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, phone number, and (for mobile bidding) a payment method on file before placing any bid. Why this matters: 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 comes up later.
2. Bidding starts and ends at the times posted
Publish exact start and end times on every bid sheet and every piece of signage. A common convention 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 items under $100, $10 for items $100 to $500, and $25 for items above $500. If the increment is $10 and the current bid is $50, the next valid bid must be at least $60. Bids that don't meet the increment are disqualified.
4. Starting bids reflect market value
Starting bids are typically set at 40 to 50% of the item's market value. This gives bidders room to climb while protecting the item from selling for too little. Print the market value on the bid sheet so donors can see what they're paying relative to the item's worth.
In Australia, purchasing an item at a charity auction is generally not a tax-deductible gift because the bidder receives a benefit in exchange, even when the charity is DGR-endorsed. There is a narrow exception: if a bidder at a DGR fundraising event knowingly pays more than the market value of an item, the amount above market value may be deductible under Division 30 of the Income Tax Assessment Act 1997, subject to ATO conditions (ATO, Not-for-profit organisations hub; ACNC DGR fact sheet). Donors can verify your DGR status on ABN Lookup and should speak to their accountant for their specific situation. Zeffy doesn't provide tax advice.
5. Bidders may bid on as many items as they want
There's no cap on how many items a single bidder can win unless you've 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 can't be retracted. Once the auction closes, the high bid is the sale. No refunds, no exchanges, no "I changed my mind." State this on every bid sheet and on signage near the items.
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 walk out with the item, by credit card or mobile payment. If you're 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 items, such as alcohol packages, experience trips, and items 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 win items containing alcohol (the legal drinking age in every Australian state and territory). Volunteers will check ID at checkout for age-restricted items. Note this on the item description, not buried in fine print. Also check whatever your state or territory law requires for general bidding age limits.
11. Bidders assume the risk of their bids
Items are described to the best of the organiser's knowledge, but the not-for-profit 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 item condition.
12. Items are sold as-is
No guarantees, no warranties, no returns. Describe each item's condition honestly in the catalogue and on the bid sheet to set expectations up front.
How to set market value for auction items
Market value is the price a willing buyer would pay a willing seller for an item in its current condition. The ATO uses this concept when assessing whether a payment to a charity qualifies as a deductible gift. Your bidders use it as the anchor for how much to bid.
To research market value, find three comparable listings, such as retail prices for new goods, completed sales for collectibles, or hotel rate cards for experience packages, and use the median. Document your sources in case a donor asks.
For starting bids, a common convention is 40 to 50% of market value. A signed jersey with a $200 market value gets an $80 to $100 starting bid. That gives bidders room to climb without leaving money on the table.
The AU tax reality for auction items. In Australia, a purchase at a charity auction is not a tax-deductible gift, because the bidder receives a benefit in return for their payment. This applies even when your charity is DGR-endorsed (ATO NFP hub; ACNC DGR fact sheet). The narrow exception: at a DGR fundraising event, if a bidder knowingly pays more than the market value of an item, the amount above market value may qualify as a deductible "contribution" under Division 30 of the ITAA 1997 (conditions apply). Print the market value on your bid sheet so donors can assess their own position, direct them to ABN Lookup to confirm your DGR status, and always point donors to their accountant for personal tax advice.
Mobile bidding rules vs. paper bid sheet rules
The rules don't change. The enforcement does. Here's 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's stricter, but it's 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've been outbid. Mobile bidders get an email the moment they're outbid, which is what keeps bidding 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 can't 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 you set, with everyone seeing the same countdown.
- Checkout: Paper auctions require a checkout line where winners pay one by one. Mobile bidding charges the card on file at close and emails the receipt. No line.
If you're running a hybrid setup (some items on paper, some on mobile), publish two rule sheets so there's no confusion about which mechanics apply where. If you're considering online auction software for the first time, it's worth comparing the setup time against your volunteer capacity.
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, item tables, and checkout. Under-staffing is the number one cause of bad auction nights.
- Do post the close time in three places. Signage at the entrance, signage at each item table, and a verbal announcement 15 and 5 minutes before close.
- Do offer at least two payment methods. Credit card and mobile wallet at minimum.
- Do run a preview period. Open item 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'll need them.
- Do announce closing warnings. 30 minutes, 15 minutes, 5 minutes. This is when the biggest bidding wars happen.
Don't
- Don't over-procure items. Twenty great items beat sixty mediocre ones. Bidders spread thin across too many items leaves money on the table.
- Don't skip the preview period. Bidders who haven't seen an item won't bid aggressively on it.
- Don't let winners walk out unpaid. Card on file or payment-before-pickup. Always.
- Don't change the rules mid-event. If you publish a $10 increment, don't accept a $5 bid because someone's friend asked nicely. It corrodes the whole night.
- Don't forget the closing warnings. A silent close kills your final-minute bidding bump.
- Don't bury the market value. Print it on the bid sheet next to the starting bid so donors understand what they're paying relative to the item's worth.
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, item-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 aren't visible, the bid written higher on the sheet wins. State your tiebreaker rule in advance and apply it consistently.
Managing the checkout line
If you're running paper, expect 30 to 60 minutes of checkout for a 100-guest event. Stagger pickup by table or item category to avoid one giant queue. If you're running mobile with auto-charge, checkout collapses to 'show your email confirmation, pick up your item', but you still need someone at the door verifying.
When a winner's payment declines
For paper auctions: have the winner re-attempt with a different card or method on the spot. If they leave without paying, the item 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.
Legal considerations and compliance
Auction law varies by state and territory in Australia, and this is general information, not legal or tax advice. The checklist below points you to the right resources.
State-by-state fundraising licences
Fundraising in Australia is regulated state-by-state, not federally. Depending on where you operate (and where your donors are), you may need a fundraising authority or licence before you run your event.
- NSW (NSW Fair Trading, Charitable Fundraising Act 1991): A fundraising authority is required if your appeal raises more than $15,000 in a financial year. From 1 April 2026, ACNC-registered charities are automatically deemed to hold a NSW fundraising authority and no longer need to apply separately (NSW Government, Charitable Fundraising).
- VIC (Consumer Affairs Victoria, Fundraising Act 1998): ACNC-registered charities can notify Consumer Affairs Victoria and be recognised without a separate licence application.
- QLD (Office of Fair Trading, Collections Act 1966): ACNC-registered charities can use ACNC registration to obtain a fundraising authorisation from QLD OFT via the cross-border recognition scheme (ACNC, Fundraising in Queensland).
Gaming law (only if you're also running a raffle)
A silent auction is not 'gaming' under AU law (there's no element of chance). However, if your event pairs a silent auction with a raffle, the raffle is regulated separately by state gaming law. In Victoria, a Minor Gaming Permit is required if the total prize value exceeds $20,000, and cash prizes are prohibited (VGCCC, Community and charitable gaming). In Queensland, large raffles are called 'art unions' and are regulated by the OLGR (ACNC, Fundraising in Queensland). In NSW, raffles are governed by the Community Gaming Act 2018. Check with your state or territory gaming regulator before pairing a raffle with your auction.
Liquor licensing
Serving alcohol at your event, or auctioning alcohol packages, typically requires a temporary or limited liquor licence from your state or territory liquor regulator (for example, Liquor and Gaming NSW, the Victorian Commission for Gambling and Liquor Regulation, or the QLD Office of Liquor and Gaming Regulation). Rules and thresholds differ by state or territory. Apply early: these approvals take time.
Privacy Act 1988 and the Australian Privacy Principles
The Privacy Act 1988 (Cth) and the Australian Privacy Principles (APPs) apply to not-for-profits with annual turnover above $3 million (smaller organisations can opt in). If you collect bidder registration data, the Notifiable Data Breaches scheme applies. Collect the minimum data you need, store it securely, and set a retention limit. Source: OAIC, Privacy for not-for-profits, including charities.
GST on ticketed and benefit-received elements
If your charity is GST-registered, gala event tickets and auction items where the bidder receives a benefit are typically taxable supplies. You must issue a GST tax invoice showing the price and 10% GST separately. This is a real compliance point for GST-registered charities running galas. Confirm your GST position with your accountant before the event (ATO NFP hub).
Donor receipts and DGR
Only gifts of $2 or more to a DGR-endorsed charity are tax-deductible, and only when the donor receives no material benefit. Auction item purchases, gala tickets, and raffle tickets are excluded. The narrow exception (contribution above market value at a DGR fundraising event under Div 30) is covered in the market value section above. Tax-deductible receipts must include the charity's name, ABN, and a DGR statement. Donors can verify DGR status on ABN Lookup. Source: ACNC DGR fact sheet.
Event and public-liability insurance
A one-off event public-liability policy is standard for AU charity galas. Check whether your existing NFP policy covers the venue and activity before assuming it does.
This section is general information, not legal or tax advice. For free plain-English guidance, visit Justice Connect's Not-for-profit Law or the Fix Fundraising campaign resources. Speak to a lawyer or accountant for guidance specific to your organisation and state or territory.
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
Item procurement is the longest lead time in auction planning. Start outreach to donors and sponsors three months before the event so you have time to chase the high-value items. If this is part of a broader gala, review charity gala planning steps to make sure your timeline covers all the moving parts.
2. Offer a curated mix of items
Aim for a spread: a few high-ticket experiences ($500 and up), a solid middle tier ($100 to $500), and accessible silent auction items your bidders will actually chase under $100 so every guest can win something. Refer to silent auction item ideas for inspiration suited to AU charity galas and community events.
3. Make bidding effortless
Mobile bidding from a phone via QR code removes the biggest friction in the funnel: walking back to a table. If you're running paper, invest in clean, well-designed silent auction bid sheets with the rules printed at the top.
4. Stage the room intentionally
Group items by category, light them well, and put your highest-value items in the highest-traffic spots. Use printed signage to explain the rules and the close time. Don't 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've seen the catalogue before they arrive bid faster and higher. This is also a good moment to remind your audience about your fundraising events program more broadly.
6. Always follow up
Thank-you emails to bidders (winners and non-winners), recognition for item 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 market value of your items multiplied by 0.6 to 0.8 equals expected gross revenue. If your items total $20,000 in market value, plan for $12,000 to $16,000 in gross. Set your fundraising goal 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 Not-for-profit Organisation's Name], Silent Auction Rules
Welcome to our silent auction! Please review 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, and phone number before placing any bid. Mobile bidders must also provide a payment method on file.
3. Market Value. Each item's market value is printed on the bid sheet. Starting bids are set at approximately 40 to 50% of market value. Note: purchasing an item at a charity auction is generally not a tax-deductible gift in Australia. Speak to your accountant if you have questions.
4. Minimum Bid Increment. Bids must meet the minimum increment of [amount] per item, or the increment listed on the item card. Bids below the increment are disqualified.
5. Multiple Bids. Bidders may bid on as many items 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]. 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 items, as noted on the item card.
10. Age Restrictions. Bidders must be 18 or over to win items marked as age-restricted (for example, alcohol packages). ID will be verified at checkout, as required by your state or territory law.
11. Assumption of Risk. Bidders assume all risk related to auction items and the bidding process. [Your Not-for-profit] makes no warranty regarding item condition.
12. As-Is Condition. All items are sold as-is. Please review descriptions before bidding.
Thank you for supporting [Your Not-for-profit Organisation's Name]. Questions? Contact [name] at [email/phone].
Happy bidding!
Short version for mobile bidding only: Bidding opens [time/date] and closes [time/date]. Register your name, email, phone, and card before bidding. Minimum increment is [amount]. Cards on file are charged automatically at close. All bids and sales final. Items sold as-is. Questions? Contact [name].
How silent auctions fit the AU platform landscape
In Australia, charity gala silent auctions typically run on GalaBid, the AU-native specialist purpose-built for one-night silent and live auctions with mobile bidding. Event ticketing often sits with Humanitix (NFP-registered, 2.5% + $0.50 per NFP ticket) or TryBooking ($0.50 per paid ticket + 2.5%). Donations often sit with GiveNow or Raisely. The result is a fragmented stack, each platform adding its own cut.
Zeffy consolidates donations, ticketing, memberships, auctions, and donor management into one free platform: $0 platform fee, $0 transaction fee, $0 card fee, ever. It's Canadian-built (not US), which AU early adopters consistently read as a trust signal, and it handles $2 DGR-compliant tax receipts on the donation side. The 50-item-per-form limit and email-only outbid notifications are real constraints to plan around; details are in the section below.
How Zeffy makes silent auction rules easy to enforce
Most of the rules above 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: form enforces it. Set the per-item increment when you build the auction. Bidders can't submit a number that breaks the rule.
- Full-payment-at-close rule: cards saved on first bid, auto-charged at close. Winners' credit cards are charged automatically the moment the auction ends. You won't have to chase bidders on Monday morning.
- Outbid-allowed rule: automatic email notifications. When a bidder is outbid, they get an email instantly. (Email only: Zeffy doesn't send SMS outbid notifications, so set guest expectations accordingly.)
- No-app friction: mobile-web bidding via QR. 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 items, the platform doesn't run absentee proxy bidding on a bidder's behalf, and there's 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 not-for-profits. No platform fee, no transaction fee, no card fee. Ever. More than 100,000 organisations have raised over $2 billion on the platform, with every dollar in fees saved going straight back into their cause.
Frequently asked questions
What happens if two people bid the same amount?
The bid with the earlier timestamp wins. If timestamps aren't recorded on a paper bid sheet, the bid written higher on the sheet takes precedence. State your tiebreaker rule clearly in your printed rules and on your signage so there's no ambiguity on the night.
Can bidders retract their bids?
No. Once a bid is placed, it's final. Your rules should state this clearly on every bid sheet and on your signage. The standard language is: "All bids and sales are final. No refunds or exchanges." If you're using mobile bidding software, bids are locked the moment they're submitted.
How do I handle a bidder who won't pay?
For paper auctions: have the winner re-attempt with a different payment method on the spot. If they leave without paying, your rules should state the item goes to the next-highest bidder. Document everything. 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, publish the non-payment consequence in your rules before the event, not after.
Are silent auction purchases tax-deductible in Australia?
Generally no. Buying an item at a charity auction means you receive a benefit in exchange for your payment, so it's not a tax-deductible gift under ATO rules, even when the charity is DGR-endorsed (ATO NFP hub; ACNC DGR fact sheet).
The narrow exception: at a DGR fundraising event, if a bidder knowingly pays more than the market value of an item, the amount above market value may qualify as a deductible 'contribution' under Division 30 of the ITAA 1997, subject to ATO conditions. Donors should check your DGR status on ABN Lookup and speak to their accountant. Zeffy doesn't provide tax advice.
What's a fair minimum bid increment?
common convention by price tier: $5 for items under $100, $10 for items between $100 and $500, and $25 for items above $500. Higher increments on high-value items keep the bidding moving without small, slow climbs. Print the increment on each bid sheet or item card so bidders know before they write their number.
Do I need a licence to run a silent auction in Australia?
It depends on your state or territory. Fundraising is regulated state-by-state, and you may need a fundraising authority. In NSW, a fundraising authority is required if your appeal raises more than $15,000 in a financial year; from 1 April 2026, ACNC-registered charities are automatically deemed to hold that authority (NSW Government, Charitable Fundraising). In VIC and QLD, ACNC-registered charities can use cross-border recognition processes to satisfy local requirements.
silent auction itself is not 'gaming' under AU law (raffles are, and they're regulated separately). If you're serving alcohol, you'll almost certainly need a temporary liquor licence from your state or territory liquor regulator.
For free plain-English guidance tailored to AU not-for-profits, visit Justice Connect's Not-for-profit Law.
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