Interior design firm cash flow feels tight on profitable projects because money goes out (vendor deposits, freight, install labor) on a different schedule than it comes in (client deposits, milestones, final invoicing). A project netting 25% on paper can still produce two or three cash-tight months. The fix is structural. Built once, it runs on its own.
You already know your bank balance and your P&L are telling different stories
You can feel the gap.
It’s the project that just closed where the numbers were beautiful, the wire comes in, and the next morning you’re paying a vendor for the install that starts in three weeks, and a freight bill from a job you finished in March somehow shows up too, and the relief from the wire lasts… an afternoon. Maybe two.
It’s the conversation with your bookkeeper where the firm is profitable on paper and your bank account is laughing at both of you.
You’re not confused about whether the business is making money. You know it is. You just want the bank account to move in step with the actual health of the firm, instead of running on its own schedule with its own opinions.
That feeling is one of the most common reasons interior design firm owners reach out to us. The math on the firm is fine. The timing of the math is what’s off, and timing is the kind of thing you can build a system around.
Where your cash flow actually goes between deposit and install day
A typical residential project for a firm in your range runs four to nine months from contract signed to install day. That’s a lot of time for the cash to go on its own little adventure.
Here’s the sequence most firms run on:
Day 1: client deposit lands. You feel rich for an afternoon.
Week 2-3: your team is putting design hours into the project. No new cash in. The deposit from week one is still the deposit from week one.
Week 4-12: orders start going out. Trade vendors want their 50% deposits now, or full payment up front on custom pieces, and they would like that money this week please. Their schedule rarely matches your client’s next milestone payment.
Month 3-6: freight bills land. They were never the deposit. They were extra. Freight on a single $40K furniture order can clear four figures on its own, which is the kind of thing that’s easy to forget until it isn’t.
Month 6-8: final pieces ship, install crew gets paid, the punch list happens (plus the four small things that always go wrong on punch lists).
Month 7-9: final invoice goes out. You wait 14-30 days for payment, sometimes 45, because the client is traveling.
In month four, the bank looks scary. In month nine, it looks great. The project itself was fine the whole time. The P&L said so. The cash just decided to take the scenic route.
When you have one project running, that’s a mild inconvenience. When you have six projects running, all in different months of the same wave, it becomes the single thing that defines how the firm feels week to week.
The three places the cash actually leaks (and none of them show up on a P&L)
In the design firms we work with, three things keep showing up as the real culprits behind month-four panic.
1. Procurement deposits aren't matched to client deposits.
You collect a deposit at signing, then milestone payments tied to project phases. Reasonable, logical, every contract template does it this way. The problem is that trade vendors don’t read your milestone schedule. They want their cut when you place the order, which is often week three of a 24-week project. If the client deposit was sized for design fees, it doesn’t have room for procurement deposits, and now you’re floating the difference out of operating cash. Which is exactly how operating cash ends up looking the way it looks.
2. Freight and shipping never make it into the project budget.
Freight on FF&E runs 5-12% of the order, more for white-glove or international pieces. It arrives weeks after the order, surprises nobody who’s been through one of these before, and somehow still doesn’t make it into the project budget. Most budgets quietly round freight into “miscellaneous,” which is the financial version of putting something in a drawer and hoping it stays there.
3. Your design fee revenue isn't matching your design fee labor.
Your team puts 60 hours into a project in month two. The next milestone payment doesn’t land until month four. Multiply that gap across four or six active projects and you’re paying salaries against work whose cash hasn’t shown up yet. This is usually the single biggest contributor to month-four panic, and it’s the hardest one to see, because it doesn’t show up as one event. It shows up as a feeling.
None of these are dramatic on their own. They’re paper-thin gaps. Stack them across six active projects, all in different months of the same wave, and the firm feels broke even though it’s making money.
The fix: separate operating cash, structure deposits, plan the wave
1. Separate operating cash from project cash.
Open a second business account. That account is for client deposits and procurement holds only. Money in when a client pays, money out when you place an order or pay freight. Your operating account only sees revenue you’ve actually earned: design fees, completed milestones, procurement fees, that kind of thing.
This single change does more for owner sanity than any spreadsheet ever will. The operating account starts telling the real story about the firm, instead of telling the real story with a wave layered on top.
2. Restructure the deposit schedule.
A flat 30% retainer at signing isn’t built for the actual cash sequence. For most firms, a better structure looks like a design fee retainer at signing (non-refundable, credited against billable hours), plus a procurement deposit around 50% of estimated FF&E (collected before any orders are placed), plus milestone payments aligned to install phases.
Numbers vary by project size and your trade terms. Set it once in the contract template and you stop thinking about it. The next year of cash flow gets meaningfully quieter.
3. Run a 13-week cash flow forecast.
Not a budget. A rolling forecast that maps every known inflow and outflow over the next 13 weeks across every active project. First time you build it, it takes three or four hours. After that it’s a 20-minute weekly update.
You stop being surprised by your own business, you stop transferring money the wrong direction at 11pm (we’ve all done it), and you start seeing the wave before it gets to you. This is one of the first things we put in place when we step into the fractional CFO seat for a design firm. Everything downstream gets easier.
The thing that surprises a lot of owners we work with
A 35% markup on a $50K order looks like $17,500 of money on the table. Sounds great.
Your gross margin on that order, after freight, breakage, returns, replacements, and the hours your project manager spent ordering and tracking the thing, is usually closer to 20-22%. We see most firms’ procurement margins land 10-15 points below what they thought they’d be.
Nobody was doing anything wrong. The small costs around procurement just never got fully tallied, because they show up scattered across the project on different bills on different days.
Once you can see the real margin, you can price differently on the next project. That move alone often closes the cash gap before any of the structural fixes finish doing their work.
Frequently Asked Questions
Are client deposits considered income for an interior design firm?
No. A client deposit is a liability on the books until you’ve delivered the work it’s funding. Recording it as income early makes the P&L look healthier than it is and creates a tax problem you don’t need. Your bookkeeper should treat deposits as a deferred revenue liability and recognize income as the work is performed.
What's a healthy cash reserve for an interior design firm?
Three to six months of operating expenses, held in a separate account, is the typical target for firms in the $1M-$10M range. The lumpy revenue cycle makes anything less than three months risky. Build to it over 18-24 months if you’re starting from scratch.
How big should the initial design fee retainer be?
For most boutique firms, the design fee retainer covers the first phase of work in full, usually 25-40% of total design fees depending on scope. The retainer should be non-refundable and credited against billable hours. Anything smaller and you’re financing the early work yourself.
Should I charge a procurement fee on FF&E?
Yes. A procurement fee (typically 10-15% of the wholesale cost of FF&E, sometimes more for complex projects) covers the time your team spends sourcing, ordering, tracking, and reconciling. It’s separate from your markup, and it makes the procurement work actually pay for itself.
When the cash story stops matching the profit story
If the firm has been profitable on paper for two years and your bank balance still has months that scare you, the gap isn’t going to solve itself by selling harder. It’s structural. The right structure builds itself once, then runs alongside the operational spine under your projects without much fuss. Most of the firms we work with see the operating account stop swinging within 60-90 days of putting it in place.
If that sounds like the next thing you want to figure out, let’s talk. We work with interior design firms in your range and we can usually tell within one conversation whether the cash story is something we can help you put together.