SF 33 And Amendments: How To Sign The Offer And Acknowledge Every Change
Short answer: on the SF 33, you complete the Offer section, blocks 12 through 18: your acceptance period, any prompt payment discount, the number and date of every amendment, your company name and address, the signer's name and title, the signature, and the date. Then you acknowledge every amendment the way the solicitation and the amendment itself tell you to. Miss an amendment, and your offer can be rejected even if everything else is perfect.
What The SF 33 Is
The SF 33, "Solicitation, Offer, and Award," is the cover form used for many sealed bid solicitations (IFBs) and negotiated solicitations (RFPs). The current GSA edition is Revision 12/2022. Like the SF 1449, one form does three jobs: the government's solicitation on top, your offer in the middle, and the award at the bottom.
If you are bidding on a commercial buy, you will more often see the SF 1449 instead. For construction, it is usually the SF 1442. Not sure what kind of solicitation you are looking at? Start with our guide to RFP vs RFQ vs IFB.
The Top Of The Form: Read It First
The government fills in the solicitation half. Read it before you write anything.
Block 3: the solicitation number. Put it on every page you submit.
Block 4: the type of solicitation, sealed bid (IFB) or negotiated (RFP).
Block 7 and 8: who issued it, and where to send your offer if different.
Block 9: how many copies, where, and the due time and date. The form warns that late submissions, modifications, and withdrawals are governed by the provision named in Section L (52.214-7 for sealed bids or 52.215-1 for proposals).
Block 10: the contact for questions.
Block 11: the table of contents, Sections A through M, with the sections included in this solicitation checked.
The Offer Section, Block By Block
The form marks the Offer section "must be fully completed by offeror."
Block | What To Put There |
|---|---|
12 | How many calendar days the government has to accept your offer. The form says 60 calendar days unless you insert a different period. Do not insert fewer days than the solicitation requires. (The form notes block 12 does not apply if the solicitation includes 52.214-16, Minimum Bid Acceptance Period.) |
13 | Any discount for prompt payment (10, 20, or 30 days). Leave it blank or write "None" if you do not offer one. |
14 | Acknowledgment of amendments: the number and date of every amendment you received. |
15A | Your company's name and address, with the code and facility code the solicitation asks for. Match your SAM.gov registration exactly. |
15B | Your telephone number. |
15C | Check this only if payments go to a different address, and enter that address in the schedule. |
16 | The name and title of the person authorized to sign the offer. |
17 | The signature. |
18 | The offer date. |
The bottom half, blocks 19 to 28, is the award. The government completes it.
Amendments: Why They Matter So Much
An amendment changes the solicitation after it was posted. It can change the due date, the work, the quantities, the page limits, the price schedule, the wage determination, or the evaluation factors. Because it changes what you are offering, the government needs proof that you saw it.
Under the federal rules for proposals (FAR 52.215-1), offerors must acknowledge receipt of any amendment by the date and time specified in the amendment. Under the rules for sealed bids (FAR 52.214-3), bidders must acknowledge receipt of any amendment, and the government must receive the acknowledgment by the time and at the place set for receipt of bids.
The standard amendment form, the SF 30, puts it bluntly: if your acknowledgment is not received at the designated place before the due hour and date, that failure may result in rejection of your offer.
The Three Ways To Acknowledge On The SF 30
Item 11 of the SF 30 (Revision 11/2016) lists three methods. Use whichever your solicitation allows:
Complete items 8 and 15 of the SF 30 and return copies. Item 8 is your name and address. Item 15 is the signer's name and title (15A), the signature (15B), and the date signed (15C).
Acknowledge on each copy of your offer. On the SF 33, that is block 14. On the SF 1442, it is block 19.
By separate letter or electronic communication that references the solicitation number and the amendment number.
For sealed bids, FAR 52.214-3 also lists identifying the amendment number and date on the bid form, and email when email bids are authorized.
Can A Missed Amendment Be Forgiven?
Sometimes, but do not count on it. In sealed bidding, a contracting officer may treat a missing acknowledgment as a minor informality only if your bid clearly shows you received the amendment anyway, or the amendment has no effect, or only a negligible effect, on price, quantity, quality, or delivery. Any amendment that changes the work or the price usually fails that test.
If The Amendment Changes Your Offer
If you already submitted and an amendment changes something, the SF 30 explains that you can change your offer by letter or electronic communication, as long as it references the solicitation and the amendment and is received before the deadline.
How To Never Miss An Amendment
Follow the notice on SAM.gov (or the state or city portal) so you are told when it changes.
Check the notice history the day before you submit, and again the morning of.
Keep an amendment log: number, date, what changed, and how you acknowledged it.
Update your compliance matrix with every change.
Acknowledge in two places when allowed: block 14 of the SF 33 and a signed SF 30.
SF 33 Checklist
Blocks 12 through 18 complete, with no blanks.
Acceptance period meets or beats the solicitation's minimum.
Every amendment listed by number and date in block 14.
Every SF 30 signed in item 15 and returned, if the solicitation asks.
Name and address match SAM.gov.
Signed by someone with authority to bind the company.
How GradeTheBid Helps
GradeTheBid reads every file in the solicitation package, including the amendments, and flags an unsigned offer form, a blank acknowledgment block, or an amendment your draft never mentions. In test grades we ran in October 2026 on real SAM.gov solicitations, unacknowledged amendments showed up in the fix lists for several different agencies.
Get Your Free Proposal Grade
Upload the solicitation, every amendment, and your draft, and see what is missing in minutes.
No credit card. No win promises. Just a clear list of what to fix before you submit. GradeTheBid never submits anything to the government. You download your files and submit them yourself.
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Keep Reading
Why Government Proposals Get Rejected: 12 Mistakes To Fix Before You Submit
RFP Vs RFQ Vs IFB: What Each Government Solicitation Asks You To Do
Sources
SF 33, Solicitation, Offer, And Award (Rev. 12/2022), GSA Forms Library
SF 30, Amendment Of Solicitation/Modification Of Contract (Rev. 11/2016), GSA Forms Library
FAR 52.214-3, Amendments To Invitations For Bids, Acquisition.gov
FAR 52.215-1, Instructions To Offerors, Competitive Acquisition (Paragraph (b), Amendments), Acquisition.gov
FAR Overhaul Part 14 (14.209, Soliciting Bids; 14.306-7, Minor Informalities), Acquisition.gov
A note on rule numbers: in 2025 the federal government began rewriting the Federal Acquisition Regulation (the Revolutionary FAR Overhaul). Most agencies now use overhaul deviation text, and the formal rule was still in progress in October 2026, so a section number in your solicitation may differ from the one cited here. When they differ, follow your solicitation. GradeTheBid is not a law firm, and this article is general education, not legal advice.
