Everyone knows reimbursement is slow. Almost nobody can say how slow, or which part of the delay is theirs — and half of it usually is.
"Reimbursement is slow" is true and completely useless. It cannot be planned around, argued with, or improved. It sits in the same category as "hiring is hard" — a fact about the world you are expected to absorb.
But it is not one delay. It is a chain of six, each with a different cause, a different length, and — this is the part that matters — a different owner. Three of the six links belong to the agency. Three belong to you. Two organisations with identical awards from the same agency can be paid weeks apart, and the difference is entirely in the links they control.
The chain looks different depending on how the award pays. Four mechanisms, and it is worth being certain which one you have before measuring anything.
Advance drawdown. You request funds against imminent need rather than costs already incurred. The chain is short because the first link — spend the money first — does not exist. If you have this, most of what follows does not apply to you, and you should know that you are in the fortunate case rather than the normal one.
Reimbursement drawdown. The cost must be incurred before you can draw. Your own systems determine most of the delay, which is unwelcome news and also the good news.
Cost-reimbursement invoicing. Spend, prepare, submit, wait for a payment office. There is a statutory clock, but it starts on a proper invoice. An invoice sent back for correction does not pause that clock so much as reset your position in the queue.
Firm-fixed-price milestones. Paid on acceptance of a deliverable. The chain here is not really about invoicing at all — it is about how long acceptance takes, which is a different conversation and often a longer one.
For anything reimbursement-shaped, the money travels six links:
incur the cost → close the books → prepare the claim → submit → agency review → disbursement
The three in bold are yours.
Close the books. You cannot claim a cost you have not booked. An organisation closing monthly can claim in the first week of the following month. An organisation closing quarterly cannot claim February's spend until April, no matter how fast everything downstream moves. This one link is frequently the longest in the entire chain, and it is entirely internal.
Prepare the claim. If your incurred-cost documentation is current, preparation is assembly. If it is not, preparation is reconstruction — chasing receipts, allocating payroll after the fact, working out which award a purchase belonged to. Same task, wildly different durations, determined by decisions made weeks earlier.
Submit. Sounds instant. Is not, if it waits for the person who knows the portal to come back from leave, or for a signature, or for the monthly finance meeting. A claim prepared on the 3rd and submitted on the 20th has spent seventeen days in your building.
The other three — agency review, disbursement, and the bank — are outside your control. They are also, in most cases, more predictable than yours. Agencies pay on a cadence. Your internal links are the variable ones.
Which is the whole point. A company that closes monthly and submits on the third is paid meaningfully sooner than one that closes quarterly and submits when someone remembers — same award, same agency, same work, same reviewers. Nobody at the agency did anything differently.
Two organisations make the point better than an argument does. Both hold reimbursement awards from the same agency. Both spend $60,000 in February.
The first closes its books monthly. February closes on the 4th of March, the claim is prepared from documentation that was already current, and it is submitted on the 6th. Agency review and disbursement take whatever they take — call it four weeks, the same for both — and the money lands in early April.
The second closes quarterly. February's spend is not booked until the Q1 close in April. Preparation means reconstructing three months of allocations, which takes a fortnight. The claim goes out in early May and the money lands in early June.
Two months apart, on identical awards, from the same reviewers. The agency behaved identically in both cases. Every day of the difference was spent inside the second organisation, and none of it was anybody being slow — quarterly closing is a perfectly normal choice that nobody made because of its effect on drawdown timing, because nobody connected the two.
One caution: do not take a number from this article. Measure your own. Take your last four claims, count the days at each link, and write them down. It takes an hour and it is the only version of this chain that is true for you.
Here is where it stops being an administrative problem.
Runway is usually described as cash divided by burn. That works when money leaves smoothly and nothing arrives. It stops working the moment something large lands in the middle, because runway is not a level — it is the first date your balance crosses zero. And a curve that dips below zero and comes back has crossed it once already.
Take a six-month budget period, spending evenly, reimbursed after the period ends. The balance falls all the way through, bottoms out, and recovers when the drawdown lands. Now vary only the lag:
lag 0 trough −$200k · closes month 6
lag 1 trough −$300k · closes month 7
lag 2 trough −$300k · closes month 8
lag 3 trough −$300k · closes month 9
The depth stops changing after the first month. Once spending has finished, extra lag does not dig the hole deeper — it holds you at the bottom for longer. The exposure is set by cumulative spend against cash; the lag sets how long you have to survive it.
Now run the same thing where spending continues through the gap — two budget periods back to back, which is the ordinary case:
lag 0 trough −$200k · lag 1 −$300k
lag 2 trough −$400k · lag 3 −$500k
Now every extra month of lag costs another month of burn, permanently. So "how much worse is a three-month lag than a one-month lag" has two different answers depending on whether you are still spending when the gap opens — and almost everybody is.
This is the part that surprises people, and it follows directly from runway being a crossing rather than a level.
Take a company two months from zero with a receipt arriving later in the year. Give it $60,000 and it survives 3.2 months instead of 2 — the money buys 1.2 months. Give it $120,000 and it survives 10.4 months.
Not 4.4, which is what doubling a 1.2-month benefit would suggest. Ten point four. The second $60,000 is worth roughly three and a half times the first, because it is the tranche that carries the balance over the trough to the far side, where the receipt is waiting. The first $60,000 only made the hole shallower. The second one got you across it.
Which means the standard framing — "we need to raise a few more months of runway" — is the wrong question. The right question is how much do we need to reach the far side of the gap, and that number is discontinuous. A bridge that falls slightly short buys you very little. The same bridge, slightly larger, changes the outcome entirely.
Five things, in rough order of leverage. None require anyone else's cooperation.
Close monthly. If you take one thing from this article, take this. It moves the longest internal link and it compounds across every claim you will ever file.
Claim on a fixed date, not on a feeling. The 3rd, the 5th, whatever suits your close. A date on a calendar removes an entire category of delay.
Keep incurred-cost documentation current. So that preparing a claim is assembly rather than archaeology. This is the difference between a two-day task and a two-week one.
Find out why your claims get returned. Every agency has a small number of recurring rejection reasons. Ask what yours are, fix them once, and stop paying that cost every cycle.
Track the obligated balance, not the award ceiling. They are different numbers. Only one of them can be claimed against today.
Measure your own chain first — the four-claim exercise above. Then put the result somewhere it changes a decision, which means a model with a time axis: spend by month, receipts placed where they actually land, and a running balance you can read a trough off.
That is what Waterline does, and a spreadsheet does it too if you would rather build one. What neither can do is invent your lag for you. The number has to come from your own last four claims, which is the one hour of work this whole article is asking for.
If you are earlier than that — still writing the budget, or still deciding what to offer as match — the decisions made at application time set most of this before the first claim is ever filed.
General information, not compliance or legal advice. Payment mechanics, invoicing requirements and review timelines vary by agency, program and award, and change over time — your award terms and your grants or contracting officer govern. The runway figures above are worked examples, not benchmarks.