Short answer
A cash flow forecast for an architecture firm is a rolling 13-week, weekly projection that maps phase billing (schematic design, design development, construction documents, procurement, construction administration) against payroll and payroll taxes, fixed overhead, and consultant pass-through costs. The structural challenge: receipts depend on contract terms and client payment behavior, and the AIA’s guide on getting paid puts the average collection period for design firms at 65 to 70 days, while payroll follows its own schedule. Use the practice’s actual collection lag, labor costs, and pay calendar. The forecast is the instrument that tells a firm, three months in advance, whether the next payroll is going to be tight. In our working ranges, healthy firms run days sales outstanding between 15 and 60 depending on revenue tier, hold one to six months of cash reserve, and invoice within 24 hours of milestone approval.
Most architecture firm principals we work with describe the same scene. It’s a Tuesday afternoon, payroll runs on Friday, and the office manager pulls up the aged AR report. There’s $180K sitting in the 30-days-plus column, most of it on one project where the owner still hasn’t signed off on substantial completion, and $40K in the 60-days-plus column where a developer client is stretching payment while their own financing closes. The principal opens a notepad and starts running the math. How much is actually going to land this week. How much is scheduled to go out. Whether the line of credit has room if it comes to that. It’s the same math every two weeks, and it never feels the same twice.
This is not a management failure. It’s the cash flow equation that every labor-heavy, phase-billed firm signs up for the moment it takes on its first paying project. The AIA’s best-practice guide on getting paid puts the average collection period for design firms at 65 to 70 days1, while the biggest outflow, staff payroll, goes out every two weeks like clockwork. The firms we work with who’ve brought their days sales outstanding (DSO) down haven’t done it by pushing harder on collections. They’ve built a cash flow forecast for architecture firms that maps their phase billing, by project, against their payroll calendar on a rolling 13-week basis, and they run it weekly with someone who knows the practice.
Why architecture firms feel cash stress even when they’re busy
When a firm walks in the door busy and profitable and still losing sleep over cash, it almost always comes down to three structural mismatches. None of them are a reflection on how the practice is run.
The payroll calendar doesn’t care about your phase schedule. Staff get paid every two weeks, consistently, regardless of where any given project sits in its billing cycle. If schematic design on the big project is signed off on the 12th and the invoice goes out on the 15th, the money lands on its own timeline. If the owner’s review takes three weeks, that cash event moves three weeks, and the payroll calendar doesn’t shift with it.
Phase billing concentrates your cash events, and the owner review makes them unpredictable. The AIA’s standard owner-architect agreement, B101-2017, organizes basic services into five phases (schematic design, design development, construction documents, procurement, and construction) and works with several compensation methods, including a stipulated sum and a percentage of construction cost2. Use your actual agreement’s progress-payment, milestone, and approval provisions. Some contracts allow monthly progress billing without a separate owner approval for every phase invoice. Where approval is required, model its likely timing. One construction administration phase with a contractor running two weeks late on substantial completion can move $60K of receivables three weeks to the right. The forecast shows this mathematically before it shows up in the bank.
Consultants and reimbursable expenses complicate the picture. Architecture firms frequently coordinate structural, civil, mechanical, electrical, plumbing, and landscape consultants, sometimes paying them on terms faster than the client reimburses. Site travel, printing, permit and plan review fees, and specialist reports all pass through. Each of these is a small cash outflow that comes back weeks later, and in aggregate they can tie up meaningful working capital.
If any of this sounds familiar, it’s worth sitting with the bigger picture: this isn’t only an architecture problem, it’s a structural feature of how every labor-heavy services business gets paid. A busy, profitable practice can still run short of cash, because the work, and the payroll behind it, comes weeks or months before the money. See our piece on why profitable services businesses still run out of cash for the full reframe.
How to build a 13-week cash flow forecast for an architecture firm
A 13-week cash flow forecast is a weekly grid. Each column is a week. Each row is a category of cash in or cash out. The model uses what finance folks call the direct method, which is a simple rule: only count money when it actually moves in or out of the bank. That’s different from how your P&L works. Your P&L uses accrual accounting, which recognizes revenue when the work is performed, not when the invoice clears. The cash forecast only cares about when money actually hits the bank.
AICPA & CIMA recommend a rolling 13-week cash flow forecast for short-term cash planning3. Thirteen weeks is long enough to see cash problems coming and short enough that the assumptions hold up.
Here’s the row structure that works for most architecture firms between about $500K and $10M in revenue.
The 13-week forecast skeleton
A 12-person architecture firm example: the rows that map to how firms actually get paid
Opening cash balance. Current cash plus cash equivalents, as of the first day of Week 1. Pull from the bank, not the P&L.
Phase invoices by project. One row per active project. For each project, list the next phase milestone (schematic design, design development, construction documents, procurement, construction administration, or another agreed fee stage), the expected completion date, the invoice date, and the expected collection date. The expected collection date should be based on how that specific client actually pays you, not your contract terms. If your biggest client averages 55 days and the contract says Net 30, the forecast uses 55.
Retainers. Upfront retainers collected before work starts. The AIA’s guide suggests sizing the retainer to the labor in the first billing cycle and crediting it only against the final invoice, so the firm works on the client’s capital rather than its own1. Show the collection as a one-time inflow, then show the final invoice net of the retainer in the week it lands.
Reimbursable and pass-through expenses. Two rows. One for reimbursables you’re paying out (consultant fees you’ll mark up, travel, printing, permit and plan review fees). One for reimbursement coming back from the client (typically on the next invoicing cycle). Architecture firms can have $20K to $60K of reimbursables floating at any given time on a busy roster of projects.
Payroll. One row per pay period. Biweekly is the most common pay period for US private employers, used by 43.0 percent of private establishments in the Bureau of Labor Statistics’ February 2023 count4. Include the employer share of Social Security and Medicare, unemployment taxes, and benefits. Forecast the payroll tax deposits in the week they actually leave the bank: under the IRS semiweekly deposit schedule, taxes on a Wednesday, Thursday, or Friday payday are due by the following Wednesday, and on a Saturday to Tuesday payday by the following Friday, while monthly depositors pay by the 15th of the following month5. Load each pay date explicitly.
Consultants and subcontracted work. Where consultants are engaged directly by the firm rather than billed through, separate them from reimbursables. They bill on their own cadence, and the firm typically pays them before collecting from the client.
Overhead. Rent, software, professional liability insurance, utilities, accounting, legal, continuing education. Load by the week the charge hits. Annual insurance and software renewals often land in a single week and can break a weak forecast.
Closing cash balance. Opening plus inflows minus outflows. The last line of each week, which rolls into next week’s opening.
A worked example, with illustrative figures. A 12-person architecture firm running at roughly $2.3M in annual revenue. Biweekly payroll of about $55K including employer taxes and benefits, or roughly $119K a month. Three active projects at different phases: one in construction administration (large, $180K phase bill due Week 4), one in design development (mid-size, $120K phase bill due Week 7), one in schematic design (smaller, $60K due Week 2 and $70K due Week 11). Reimbursables averaging $25K out and $28K in per month, staggered. Overhead of $32K a month plus a $14K professional liability insurance renewal landing in Week 9.
Built right, this forecast will tell you by Week 2 whether Week 9 is going to be tight. That’s the instrument you didn’t have.
You can build this whole thing in Excel. We’ve found with the firms we work with that once their bookkeeping foundation is structured correctly underneath, much of the forecast populates itself from project accounting and the weekly review becomes a focused conversation rather than a manual rebuild. Either way, the weekly review is where the value compounds, which brings us to benchmarks.
Cash flow benchmarks for architecture firms
Numbers without context are just numbers. Once the forecast is running, the next question is how your practice compares to firms that don’t feel cash stress. Below are the rules of thumb we use for healthy architecture firms, grouped by revenue tier. They are Visory’s working ranges, not published industry statistics.
DSO: healthy range by revenue tier
Days between invoice and money in the bank, by revenue tier
Healthy benchmark by revenue tier
- 15-30 $500K-$1.5M
Smaller firms run tighter; they serve smaller, more responsive owners.
- 25-45 $1.5M-$5M
Mid-tier firms balance a mix of owner types and project cycles.
- 30-60 $5M-$10M
Larger firms run longer because developer and institutional clients require procurement steps.
| Metric | $500K-$1.5M | $1.5M-$5M | $5M-$10M |
|---|---|---|---|
| DSO (days) | 15-30 | 25-45 | 30-60 |
| Cash reserve (months of OPEX + payroll) | 1-2 | 2-3 | 3-6 |
| AR as % of annual revenue | 4-8% | 7-12% | 8-16% |
| Quick ratio | 1.0-1.5 | 1.2-2.0 | 1.5-2.5 |
A few reading notes.
DSO (in plain terms, how many days on average between sending an invoice and the money landing in the bank) is the clearest single indicator of whether your cash is working or stuck. These ranges are much tighter than the 65 to 70 day average the AIA’s guide reports for design firms1. The firms who get there aren’t doing it with a single contract change; they’re doing it with a combination of contract discipline and a weekly rhythm that catches late approvals before they age.
Smaller firms should run tighter on DSO because they typically serve smaller, more responsive owners. Larger firms, particularly those serving developer or institutional clients, will run longer because of the procurement steps those clients require.
Cash reserve is measured against operating expenses and payroll combined. Smaller firms can run on less reserve because their cost base flexes more quickly. Larger firms need more because staff is harder to rebalance on short notice.
Quick ratio is a simple solvency check (can you meet short-term obligations without borrowing?). For a services firm, it’s roughly your cash plus uncollected invoices, divided by what you owe in the next few months. Below 1.0 means you couldn’t cover those obligations without taking on debt or making meaningful cuts.
These numbers reflect patterns across firms in our typical range, but your practice may look different depending on your service mix, project portfolio, and ownership model. A firm doing 80 percent institutional work on long project cycles will look different from a firm doing residential and small commercial with fast turnarounds. Use these as directional guides, not rigid targets.
One caveat. These benchmarks assume the books are set up correctly: project-level revenue properly recognized, consultant costs separated from overhead, and reimbursables tracked against their offsetting income. Most firms we meet don’t have this right the first time. If your numbers look unusually high or low, the issue may be how the books are structured, not how the practice is running.
The weekly rhythm that closes the collection gap
A forecast nobody reviews is just a file. The firms who’ve brought their DSO down meaningfully all do the same thing: they pair a weekly review of the forecast with a handful of contract disciplines that actually change the timing.
The weekly rhythm
30 to 45 minutes that turns a spreadsheet into three decisions
Step 1
Forecast update
Pull last week’s actuals in and re-roll the forecast forward by one week.
Step 2
Variance review
An owner took an extra week on DD approval, a consultant bill came in higher, a project paused. Reconcile each.
Three decisions
Staffing and capacity
Is the Week 10 closing balance comfortably above floor? If yes, hire or extend with confidence. If tight, wait or re-sequence staff.
Chase specific AR
Which three invoices, if they landed two weeks early, would fix Week 7? Usually the CA-phase bill or two reimbursables.
Tighten contracts
When the same delay keeps moving cash right, the forecast makes the cost visible and the contract conversation concrete.
The weekly review. Every Monday, someone who knows the firm pulls the prior week’s actuals into the forecast, adjusts any variances (an owner took an extra week on the DD approval, a consultant bill came in higher than estimated, a project paused for contractor re-pricing), and re-rolls the forecast forward one week. It takes 30 to 45 minutes. It produces three decisions.
Decision one: staffing and capacity. If the Week 10 closing balance is comfortably above floor and the pipeline supports the work, you can hire or extend a contract position with confidence. If Week 10 is tight, you wait, or you re-sequence staff across projects to match the cash profile. This is particularly important in architecture, where staffing decisions tend to have three-to-six-month tails and can’t be easily reversed.
Decision two: chase specific invoices, not “chase AR.” The forecast tells you which three invoices, if they landed two weeks early, would fix Week 7. That’s a more useful starting point than a generic collections push. Typically it’s the CA-phase bill on the big project or the reimbursables on two consulting engagements. The firms we work with who’ve moved their DSO down meaningfully run this specific-not-general approach every week, supported by proper accounts receivable management that flags problem invoices before the principal has to chase.
Decision three: tighten the contracts that are causing the drag. When the same kind of delay keeps moving cash to the right, the forecast makes the cost visible and the contract conversation stops being abstract. The three moves most firms make:
- Collect a retainer before work starts, sized to the labor in the first billing cycle and credited against the final invoice. This covers your Week 1 staff investment.
- Invoice within 24 hours of milestone approval rather than waiting for month-end. Month-end invoicing adds an average of about two weeks between approval and invoice, and the AIA’s guide warns that a firm billing once a month can miss a client’s payment run and start 30 days behind1.
- Move contract language to Net 15 rather than Net 30 where the client relationship supports it, with a late-payment interest clause. What you can charge depends on the agreement and on the law of the state that governs it, so the AIA’s guide advises setting out due dates and when interest and penalties apply in the contract itself1.
None of these require renegotiating with every client. They work when a firm applies them to new engagements consistently and then reviews existing big-account contracts at their next natural renewal.
This approach suits firms coming in with average DSO in the 70s or 80s, and the first year can end with a meaningfully different number. This example is illustrative: the figures are representative of the pattern, not a named customer’s results. An 11-person architecture firm with five active projects, mostly commercial, was collecting at around 74 days on average, with a line of credit drawn down to roughly 60 percent of its limit and payroll anxiety on every second pay run. Within six months of building the weekly forecast rhythm and tightening two specific contract clauses, DSO sat at 38, the line of credit was at 15 percent drawn, and the principal’s description of payday changed from “stressful” to “quiet.”
The forecast didn’t do those things on its own. A weekly rhythm, a partner who understood the practice, and a small set of contract disciplines did. The forecast was what made each decision visible in time.
For the layers the cash forecast sits on top of, see our pieces on how architecture firms improve profitability and how to calculate the true cost of winning a new project.
FAQ: Cash flow forecasting for architecture firms
What is a 13-week cash flow forecast for an architecture firm?
A 13-week cash flow forecast for an architecture firm is a rolling weekly projection of cash in and cash out, built around the rows that matter for an architectural practice: phase invoices by project, retainers, reimbursable expenses in and out, biweekly payroll and payroll taxes, consultant costs, and fixed overhead like professional liability insurance. It tracks actual cash movements, not accrual entries, so it shows when money will hit the bank, not when revenue is recognized on the project accounting side.
What’s the average time an architecture firm waits to get paid?
The AIA’s best-practice guide on getting paid puts the average collection period for design firms at 65 to 70 days, with some waits running 120 to 180 days, especially for subconsultants1. In our experience, firms between about $500K and $10M in revenue that tighten contract language and run a weekly cash flow rhythm can bring DSO into a range of 15 to 60 days, depending on size and client mix. A long collection period is common, but it isn’t fixed.
How much cash reserve should an architecture firm keep?
Cash reserves scale with revenue. Firms in the $500K-$1.5M range typically hold one to two months of operating expenses plus payroll. Firms at $1.5M-$5M hold two to three months. Firms above $5M hold three to six months. These benchmarks assume the financials are structured correctly, with project-level revenue and reimbursables tracked cleanly.
Should architecture firms charge an upfront retainer?
Yes, where the client relationship supports it. The AIA’s guide recommends asking every client for a retainer, sized to the labor in the first billing cycle and credited against the final invoice1. It’s one of the fastest ways to smooth the early-project cash profile, because it covers the Week 1 staffing investment while the first phase bill is still weeks away from invoicing. Firms who adopt this consistently on new engagements see the change show up in the forecast within a quarter.
If your forecast is still a monthly summary from your bookkeeper
The firms who stopped feeling cash stress didn’t do it by winning bigger projects or billing at higher phase percentages. They built a weekly rhythm that surfaced the cash picture three months ahead and tightened the handful of contract clauses that drove the worst timing. Long collection periods are a consequence of how the typical firm contracts and bills. They aren’t a ceiling your practice has to accept.
If what your bookkeeper hands you each month is a backward-looking P&L and nobody is running the forecast with you, that’s not a sign you’re doing something wrong. It’s a sign the financial setup underneath the practice is missing the forward-looking layer that labor-heavy, phase-billed firms specifically need. Visory Insights gives you a plain-English monthly read of your numbers, walked through with a Business Performance Partner, so the cash picture sits next to the P&L. If you want to see where your firm stands before building the model yourself, get your free financial health check.
Sources
- American Institute of Architects, AIA Best Practices: How to get paid. Contributed by AXA XL’s Design Professional Unit.
- AIA Contract Documents, Summary: B101-2017, Standard Form of Agreement Between Owner and Architect.
- AICPA & CIMA, How a 13-week cash flow cycle can help your business.
- U.S. Bureau of Labor Statistics, Length of pay periods in the Current Employment Statistics survey. Figures for February 2023.
- Internal Revenue Service, Publication 15 (2026), (Circular E), Employer’s Tax Guide.
About this article
Written by The Visory Team. Published . General information for US businesses, not advice for your situation.
