Invitation to tender (ITT), explained for suppliers
An ITT is the buyer asking you to submit a compliant, comparable tender against a set brief. Know the label, then move fast on deadline, pack, and go/no-go.
Key takeaways
- An invitation to tender invites a formal, comparable bid against a defined specification.
- RFT is often the same job under Australian / NZ wording; RFP usually invites more solution narrative.
- EOI and RFI come earlier and are not full tenders.
- When an ITT lands, lock the deadline and download the full documents before you draft.
- Decide pursue / decline early; lodging late with great prose still fails.
- UK public notices publish openly (sample below); always follow the pack in front of you.
What an invitation to tender is
An invitation to tender (ITT) is a formal notice and document set from a buyer that invites suppliers to submit a tender: a priced, compliant offer against requirements they have already defined.
In UK and many common-law public processes, the tender notice itself can operate as the invitation: it tells the market a competition is open and how to get the invitation to tender documents. A letter of invitation to tender or invitation to tender email may point you to a portal rather than attach every file.
ITT invitation to tender searches usually want the same plain answer: this is not a casual quote request. It is a structured competition with rules, timelines, and evaluation criteria.
If you are the supplier, your job is to understand the brief, check hard gates, and submit on time. If you searched "how to write an invitation to tender," that is the buyer's job (issuing the pack), not responding to it.
What landed in your inbox?
Mark the details that match the documents you received. You will see which label fits best: ITT, RFT, RFP, RFQ, EOI, or RFI. Country wording varies; the job of the pack is what matters.
Invitation to tender (ITT)
Request for tender (RFT)
Request for proposal (RFP)
Request for quote (RFQ)
Expression of interest (EOI)
Request for information (RFI)
Best match
Tick at least two cues that match the documents you received. If nothing fits, open the pack: the title page usually names the instrument.
Compare
ITT vs RFT, RFP, EOI, and RFI
Names differ by country and buyer policy. Use the pack title, then confirm the job.
| Instrument | Typical job | Supplier focus |
|---|---|---|
| ITT | Invite comparable tenders to a set spec | Compliance, capacity, price |
| RFT | Same intent; common AU/NZ public wording | Same as ITT |
| RFP | Invite proposed approach + evidence | Methodology and scored answers |
| RFQ | Price against a clear, narrow ask | Commercials and forms |
| EOI | Filter interest / capability early | Fit, not full tender |
| RFI | Gather market information | Educate; usually not a priced bid |
Note
Difference between ITT and RFP
An ITT usually assumes the buyer already knows what they want and wants comparable tenders. An RFP often asks how you would solve the problem. Read evaluation criteria: if method scores heavily, you are closer to RFP work even if the email says tender.
Compare
How many UK buying notices of each type (recent sample)
This table is a headcount of public notices on Find a Tender, the UK government website where buyers advertise contracts. We counted 500 recent notice updates from about the last 30 days. It shows how busy that board looked in the sample, not a forecast for your sector, and not Australian notices.
| Type of notice | How many | Plain meaning |
|---|---|---|
| Tender notices | 46 | Formal invitations to bid |
| Tender updates | 27 | Changes to those invitations |
| Planning notices | 48 | Early / market-sounding notices |
| Award notices | 354 | Contract awarded |
| Contract notices | 354 | Contract recorded / ongoing |
| Total in sample | 500 | All notice updates we counted |
Source: Find a Tender Service (Crown copyright), Open Government Licence v3.0. Retrieved 2026-07-29.
What that sample is for
Award and contract rows are common because many updates report outcomes and ongoing contracts, not only new invitations. Tender rows are closer to an open invitation to tender.
Australia and other markets publish on different sites (for example AusTender or state platforms). The idea of an invitation is shared; the notice board is local. Proposit does not automatically monitor Australia tenders today.
When your invitation arrives, the only counts that matter are the deadlines and mandatory items in that pack.
First 48 hours after an ITT lands
Mark what you have already done. The percentage is a quick check that the basics are covered. It is not a forecast that you will win.
Not started
0/8 (0%)
Pause drafting. Put the closing date in your diary, download the full pack, and decide bid or no-bid first.
What is usually in the invitation to tender documents
Exact contents vary. These pieces show up often:
Notice or letter stating the opportunity and closing rules
Specification / statement of requirements
Pricing schedule or commercial workbook
Mandatory forms and declarations
Evaluation criteria and weightings
Submission instructions (portal, format, labelling)
Draft contract or terms overview
Buyer vs supplier jobs
Buyers write and publish the invitation, answer clarifications, evaluate, and award. Searching "how to write an invitation to tender" is that lane.
Suppliers receive the ITT, decide whether to pursue, clarify, draft, and lodge. That lane is evaluate readiness, respond, and submit.
Do not mix the jobs. A beautiful supplier methodology does not fix a missing mandatory schedule. A perfect buyer ITT template does not help you if you ignore their portal rules.
Clarification questions belong in the buyer's published channel and before their clarification cut-off. Informal side emails can create unequal information and compliance risk.
If you are shortlisted from an EOI into an ITT, restart the 48-hour checklist. Documents and deadlines are new even if the relationship feels familiar.
Typical ITT process (supplier view)
1. Notice published or invitation email received.
2. Register / download documents and diary the close.
3. Read mandatory requirements and evaluation criteria.
4. Ask clarifications before the question deadline.
5. Decide bid, wait, or decline.
6. Draft, check compliance, and lodge through the stated channel.
7. Wait for evaluation; request a debrief if unsuccessful and the rules allow.
Stages on the buyer side (planning, award, contract) show up on public notice boards too. The sample above is a reminder that tender notices are only one slice of the lifecycle.
Tip
After you decide to pursue
Map mandatory gates to evidence, then draft. Soft product path: Proposit helps teams check what they cover against the pack and prepare answers from their own documents. Request access if that matches how you bid.
Frequently asked questions
It is the buyer's formal invitation for suppliers to submit a compliant tender against a defined brief, usually with published rules, documents, and a closing date.
ITT means invitation to tender. It signals a structured competitive process for a contract, not an informal chat about pricing.
An ITT usually seeks comparable tenders to a fixed specification. An RFP more often asks for a proposed approach. Check evaluation criteria: heavy methodology scoring behaves like an RFP even if the title says tender.
That is the buyer's task: define requirements, evaluation, timelines, and lodging rules, then publish. Suppliers should not rewrite the ITT; they should respond to it with a compliant tender.
In practice, yes for most supplier work. RFT is common public-sector wording in Australia and New Zealand. Follow the pack you received.
Diary the deadline and timezone, secure portal access, download the full document set, list mandatory gates, and run a short pursue / decline check before heavy drafting.
Early access
From invitation to a grounded response
Request access for your team.
Check readiness against the pack, then draft from your own documents in Proposit.