No-Cost Extensions (NCE): NIH, NSF, and DoD Rules and How to Request One
Research rarely finishes exactly on schedule. A no-cost extension gives a project more time to complete its approved aims using the remaining balance, without a new competition.
The rules differ by sponsor, and the deadlines are firm. Missing the window for a recipient-approved extension usually means asking the sponsor for prior approval instead.
When an extension is appropriate
- More time is needed to complete the originally approved aims.
- Continuity is needed while a competing renewal application is under review.
- The project needs an orderly phase-out, such as closing a study or finishing analyses.
- The scope stays the same and no additional funds are required.
Not appropriate: extending only to spend down an unobligated balance, starting new work outside the approved scope, or keeping a lab funded after the project is complete.
Sponsor rules at a glance
| Sponsor | First extension | Further extensions | Where to submit |
|---|---|---|---|
| NIH | Up to 12 months, approved by the signing official under expanded authority, before the project period end date | Prior approval from the NIH awarding office; submit at least 30 days before the end date | eRA Commons (Status for the first; Prior Approval module for later requests) |
| NSF | One-time recipient-approved extension of up to 12 months; notify NSF at least 10 calendar days before the end date | NSF-approved extension; request at least 45 days before the end date with a plan for remaining funds | Research.gov, submitted by the AOR |
| DoD | Set by each award's terms and the issuing grants office | Usually requires grants officer approval | As specified in the award |
Check your Notice of Award: some awards remove expanded authorities, and cooperative agreements often require sponsor approval for every extension.
NIH: first and subsequent extensions
If your Notice of Award grants expanded authorities, the signing official can extend the final budget period once by up to 12 months. The extension link appears in the eRA Commons Status module 90 days before the project period end date and disappears at the end date, so requests after that need prior approval.
A second or third extension needs NIH prior approval and is granted only in limited cases. Requests should explain why the work is not finished, give the scientific rationale, summarize progress since the last RPPR, estimate the unobligated balance, and include a budget and updated certifications.
During any extension, human subjects and animal approvals must stay current, and the original award terms continue to apply.
NSF: grantee-approved and NSF-approved extensions
NSF recipients can authorize a one-time extension of up to 12 months. The AOR notifies NSF through Research.gov at least 10 calendar days before the end date with the reasons and the revised end date. An award with a zero balance cannot be extended this way, and NSF cooperative agreements are not eligible.
Any further extension is NSF-approved. Submit it at least 45 days before the end date with an estimate of unobligated funds and a plan for using them. Late requests need a strong justification for the delay.
What to include in the justification
- The reason more time is needed, tied to specific aims or tasks.
- The new end date and why that length of time is needed.
- The estimated unobligated balance and how it will be used.
- Confirmation that scope is unchanged and no additional funds are requested.
- Status of IRB, IACUC, and other approvals that must stay current.
Sample: "Recruitment for Aim 2 was delayed by four months when the partner clinic closed for renovation. We request a 12-month extension to complete enrollment of the remaining 40 participants and the planned analyses. The estimated unobligated balance of $86,000 will support the study coordinator and participant costs. The scope of the project is unchanged and no additional funds are requested."
Timeline
| When | What to do |
|---|---|
| 90 days before the end date | Review the remaining work and balance; NIH extension link opens in eRA Commons |
| 45 days before | Deadline to request an NSF-approved extension |
| 30 days before | Deadline for NIH second or subsequent extension requests |
| 10 days before | Deadline for an NSF grantee-approved extension notification |
| End date | NIH first-extension link closes; later requests need prior approval |
Common pitfalls
- Missing the window. The NIH eRA Commons link closes at the end date, and NSF needs notice 10 days before it.
- Justifying the extension with leftover money rather than unfinished work.
- Letting IRB or IACUC approvals lapse during the extension.
A no-cost extension buys time, not money. Request it before the window closes, tie it to unfinished approved work, and never justify it with leftover funds alone.
Frequently asked questions
What is a no-cost extension?
An extension of an award's project period with no additional funds, so the approved work can be completed with the remaining balance.
How long can a no-cost extension be?
A first extension is usually up to 12 months at both NIH and NSF. Further extensions need sponsor approval.
When do I need to request an NIH no-cost extension?
The first extension is submitted in eRA Commons before the project period end date; the link opens 90 days before. Later extensions need prior approval and should be requested at least 30 days before the end date.
When do I need to request an NSF no-cost extension?
A grantee-approved extension must be submitted at least 10 calendar days before the end date. An NSF-approved extension should be requested at least 45 days before.
Can I get a no-cost extension just to spend remaining funds?
No. Both NIH and NSF state that having unobligated funds is not by itself a sufficient reason for an extension.
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