What a bid bond is (and how it works)
A bid bond is security you lodge with a tender to show you will sign the contract if you win, and provide the next security on time. It is not the same as a performance bond.
Key takeaways
- A bid bond (also called a tender bond or bid security) backs your promise to enter the contract if awarded.
- It usually sits with the tender. A performance bond usually comes after award.
- The face value is often a percentage of the bid (commonly about 1–5%), or a fixed amount the buyer sets.
- Read the tender documents for form, amount, issuer rules, and validity dates.
- Not every tender asks for one. Many smaller or services-only packs skip it.
- If you win and then refuse to sign, or fail to lodge the next security, the buyer may call on the bond.
Bid bond meaning
A bid bond is a financial undertaking, often from a bank or surety, that you lodge with your tender. In plain terms: if you are awarded the job and then refuse to sign, or you fail to provide the performance security the contract requires, the buyer can claim against the bond for their loss (for example re-tender costs), up to the bond’s face value.
People also search what is a bid bond, bid bond meaning, bid guarantee bond, and bid bond surety. Those phrases point at the same idea. Names in the pack may say "tender bond," "tender security," or "bid security" instead.
It is a seriousness filter. Buyers on large construction and infrastructure jobs use it so only suppliers who can support the bid financially lodge a tender.
How does a bid bond work?
1. The tender documents say whether security is required, in what form, for how much, and for how long.
2. You arrange a bank guarantee or surety bond that matches those rules.
3. You lodge it with the tender (or as instructed) before the closing time.
4. If you are not awarded, the bond is usually released after the process ends.
5. If you are awarded, you sign the contract and lodge the performance security. The bid bond is then released.
6. If you default at that hand-over point, the buyer may call the bond.
Exact claim wording sits in the bond form the buyer accepts. Do not invent a form. Use the specimen in the pack when they give you one.
Plan bank or broker lead time early. A finished response that arrives without the bond still fails if the bond was mandatory.
Bid bond amount estimator
Enter your bid value and the percentage (or fixed amount) from the tender documents. You get an estimate of the bond face value. Always use the figure the buyer specified.
Estimated bond face value
$125,000
That is the amount the bond or bank guarantee usually promises to pay if you walk away after award or fail to provide the next security the contract asks for. Keep it valid for about 12 weeks unless the documents say otherwise. Bank fees and surety premiums are separate and depend on your credit and the issuer.
Note
What a 5% bid bond means
If the documents ask for 5% of the bid value, and your bid is $2 million, the bond face value is about $100,000. That is the maximum the issuer may pay under the bond if you default in the way the bond describes. It is not automatically a cash payment you hand over on day one. Fees to the bank or surety are separate.
Bid bond or performance bond?
Mark the details that match what the buyer asked for. You will see whether it sounds like a bid bond (at tender time) or a performance bond (after award).
Bid bond (also called tender bond / bid security)
Performance bond (performance security)
Mark a few more details
Check the tender security / bond clauses in the documents. Mark the cues that match so this tool can tell bid-time security from after-award security.
Compare
Bid bond vs performance bond
These are the two securities people mix up most often. Many large construction contracts use both, at different times.
| Question | Bid bond | Performance bond |
|---|---|---|
| When do you usually lodge it? | With the tender | At or after contract award / signing |
| What does it protect? | Buyer risk if you walk away after winning or fail to lodge the next security | Buyer risk if you fail to perform the signed contract |
| Typical size (when used) | Often about 1–5% of bid value, or a fixed cap | Often about 5–10% of contract value (check the contract) |
| How long does it last? | Through evaluation and into contract execution | Through the delivery period (and sometimes defects liability) |
Bid bond requirements: what to find in the pack
Bid bond requirements are written in the tender instructions. Look for headings such as tender security, tender bond, bid security, or bank guarantee.
Note four things: the amount (percentage or fixed), the form (bank guarantee, surety bond, cash deposit if allowed), who may issue it (rating or approved list), and the expiry / validity rules.
If the pack includes a specimen form, match it. A home-made wording can be rejected even if the dollar amount is right.
Lodging late or with the wrong issuer is a compliance failure. Treat the bond like a mandatory schedule: finish it before you polish the story. See tender submission for the wider lodge checklist.
Before you arrange the bond
Confirm the exact amount or percentage in the latest addendum
Confirm acceptable issuer type and rating
Confirm validity end date (and any extension rules)
Confirm lodging channel (original, portal upload, or both)
Confirm what happens to the bond if you are unsuccessful
Diary the lead time your bank or broker needs
Construction bid bond
A construction bid bond is the same instrument used on building and civil works tenders. It is more common on large government, defence, and infrastructure jobs than on small private works or simple services RFQs.
Australian practice often sizes tender bonds in the 1–5% band when they are required, with some state works lower and some private or major projects higher. Thresholds and whether a bond is needed at all sit in the agency’s or principal’s documents, not in a single national rule.
If you are still deciding whether the tender is worth the security cost and writing effort, start with how to evaluate a tender.
Cost and who issues a bid bond
The face value is not the same as the fee you pay. The face value is what the bond can pay out. The fee or premium is what your bank or surety charges for issuing it, based on your credit, facility limits, and the bond wording.
Issuers are usually banks (bank guarantees / undertakings) or licensed surety providers. Brokers often help construction firms place bonds across several tenders at once so facility limits are not blown by one bid.
Soft product path: Proposit helps teams check what a tender pack requires and prepare responses from their own documents. Arranging a bank guarantee sits with your bank or broker. Request access if you want help with the response side.
FAQ
It is security lodged with a tender so the buyer has a claim if you win and then refuse to sign the contract, or fail to provide the performance security the contract requires.
It means the bond’s face value is 5% of your bid (or of another base the documents define). On a $2 million bid, that is about $100,000 of cover. Use the estimator above with your own figures.
A bid bond is usually for the tender stage. A performance bond is usually for after award, while you deliver the contract. Use the comparison tool above if the pack wording is unclear.
In many packs the phrases mean the same job: security with the tender. "Bid security" can also include cash deposits or other forms. "Bid bond" usually means a bond or bank guarantee. Always follow the form the buyer named.
Early access
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Proposit helps teams see what a tender requires and write from their own documents. Request access if that matches how you bid.