K99/R00
NIH K99/R00 "Pathway to Independence" Award
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NIH K99/R00 "Pathway to Independence" Award ·
Why the K99/R00?
I initially applied for an F32 during my last few years of grad school, to work with someone I'd identified as a desired postdoc mentor. It scored okay, then wasn't funded on a second round in summer 2020 — which is when I pivoted to interviewing for postdoc positions, including a T32 position at Brown, which I accepted.
I started on the T32 at Brown and wrote the K99 while there, transitioning directly to it. The K99 is for researchers who are essentially ready to transition to an independent research career, with 1–2 years of additional training. I applied at the start of my second year of postdoc because I was ready for independence — I already had an independent research agenda, with proof through my CV and external collaborations that I was functioning essentially as an independent researcher.
What Is the K99/R00?
Timeline
Second–third year of postdoc is critical for K99/R00 prep. Draft your application focused on demonstrating your postdoc progress, potential for independent research, and how the K99/R00 will facilitate your transition. I recommend submitting in your second year, to leave runway for a resubmission if needed. Make sure your application shows a strong mentorship plan, clear research accomplishments, and a defined path to independence.
Strategic considerations throughout: publish in reputable journals; engage with the broader research community through conferences, workshops, and collaborations; stay close with your mentor(s) throughout.
K99/R00 BREAD & BUTTER
Idea
Independent Idea vs. Co-Created with a Mentor?
I knew I wanted to study how prenatal/early stress influenced HPA axis functioning and nutrient metabolism — specifically iron. No mentors had this specific expertise, so this was very much an independent idea, co-created with my mentor once we looked through available data opportunities, assays, and stored samples/previously collected data. Co-creation is key to really understanding what's available in a dataset. My mentor and I started developing ideas about eight months before I submitted — I spent fall/spring digging through data and ideas, then the summer before my October submission writing intensively.
Reviews
I did not go through multiple rounds — mine was on the border and funded on the first submission (not super common, but very appreciated!). I went in assuming I'd need to revise and resubmit, so my goal was simply a scored grant with useful comments. I did get feedback back, which was helpful both in case I did need to resubmit and as general grant-writing takeaways. Much of the feedback focused on feasibility — I tend to fall into the trap of being "too ambitious" in grant writing, so make sure your proposal is actually feasible, and be clear about which aspects of your work are future directions versus what the K99 itself covers.
Transitioning to Faculty
Having the K99 going into the job market is a huge relief. First, it makes the job market easier because you already have funding and have spent months thinking through and writing your 5–10 year research plan. Specifically, your K99/R00 application should describe what you'll do in the R00 phase and how it dovetails into preliminary data for your next R01 — that should already be part of your application's future directions and career goals.
More money helps too. The R00 means my startup funding goes further, since I'm bringing in outside money. I was also able to talk through job offers with my Program Officer during negotiation, to make sure institutional support was written into the contract.
Hiccups: I wrote my IRB and budget for the R00 phase while still in my second year of the K99, because transition paperwork is due to NIH by June 1 for grant money to start September 1. It's a juggle — you have to submit that transition paperwork through your faculty institution too. Also find out ahead of time if anything unspent on the K99 gets taken out of your R00. For NICHD, I had about $3,000 in unspent funds for my K99, which was taken from the R00 budget.
It is not uncommon for transitions between institutions to result in a delay in R00 project, because moving and study start up is no joke (depending on your R00, mine, again, was labeled “too ambitious” and I feel that every day now that we are up and running). At the time of writing this, no cost extensions were still a thing, and I have seen them used among most R00 supported faculty I know.
ResourcesThe most helpful resources, in my experience, were people willing to share their successful applications. I initially considered a K01 before pivoting to a K99, and since I was the first person in my department writing one, seeing other examples was invaluable.
Find people willing to read and review your draft!
Program officers are also a great resource. Early on, I was weighing 3–4 different NIH institutes for fit — I wrote a specific aims page tailored to each institute's funding priorities and sent it along with my CV and timeline to POs, asking for feedback or a meeting to discuss fit. I recommend doing this as early as possible.
Grant-writing accountability buddies matter too. Also get to know your institution's grants staff — build the relationship, ask for budget help, and always follow their deadlines.