SF 30
Amendment of Solicitation/Modification of Contract
What It Is
SF 30 does two jobs. Before award, it amends a solicitation — changing the due date, answering questions, revising the statement of work, or correcting the schedule. After award, it modifies the contract — adding work, exercising an option, changing terms, or making an administrative correction. During a competition, every amendment you receive on SF 30 must be acknowledged; after award, SF 30 is the paper trail for every change to your contract.
When You'll Use It
- Whenever a solicitation changes before offers are due (you must acknowledge each one).
- Exercising an option year on a multi-year contract.
- Bilateral or unilateral changes to scope, price, schedule, or terms after award.
Who Completes It
The contracting officer issues the SF 30; for solicitation amendments the offeror acknowledges receipt, and for bilateral modifications the contractor signs to agree to the change.
Key Blocks to Get Right
| Block / Section | What It Captures |
|---|---|
| Block 13 — Type of modification | Identifies the authority for the change (e.g., the Changes clause, mutual agreement, an administrative change) — this tells you whether your signature is required. |
| Block 14 — Description of the change | The substance: what is being added, deleted, or revised, and any change to price or period of performance. |
| Blocks 15/16 — Signatures | A bilateral modification needs the contractor's signature (Block 15) and the contracting officer's (Block 16); a unilateral change carries only the contracting officer's. |
Common Pitfalls
- Failing to acknowledge a solicitation amendment — the single most common way an otherwise winning offer is found non-responsive.
- Performing extra work on a verbal direction before a signed SF 30 exists — a classic unauthorized-commitment problem.
- Signing a bilateral modification without pricing the impact, then losing the chance to recover added cost.
Frequently Asked
Do I have to acknowledge every solicitation amendment?
Yes. Each amendment issued on SF 30 must be acknowledged in your offer (in the block provided on SF 1449/SF 33 or by returning the signed SF 30). Failing to acknowledge a material amendment generally makes your offer non-responsive and can knock you out of an otherwise winnable competition.
What is the difference between a unilateral and a bilateral modification?
A unilateral modification is signed only by the contracting officer, using authority already in the contract (for example, exercising an option or making an administrative change). A bilateral (supplemental agreement) modification requires both parties' signatures because it changes the bargain — adjusting scope, price, or terms by mutual agreement.
Primary Sources
Plain-English reference, not legal advice. Standard forms are periodically reissued and the FAR is amended for inflation and policy — always download the current edition from the GSA Forms Library and confirm requirements against the solicitation and your contracting officer before relying on it.
Change log (1)
- LaunchedPublished the federal contracting forms reference covering the standard forms an SDVOSB encounters when bidding and performing set-asides — SF 1449, SF 33, SF 18, SF 30, SF 1442, SF 330, SF 1408, SF 1413, the eSRS ISR (formerly SF 294), SF LLL, SF 1034/1035, and the SAM.gov representations & certifications (FAR 52.204-8) — each with a key-blocks table, filing pitfalls, FAQPage, DigitalDocument, Dataset, and BreadcrumbList structured data, primary-source FAR citations, and cross-links into the glossary, how-to guides, FAQ, and regulation explainers.