Retainage in construction is a percentage of a contractor’s payment that an owner or general contractor withholds until specific project milestones or contractual requirements are met.

You finish a phase of work, submit your invoice and the number that comes back is smaller than what you billed. The owner or general contractor held part of your payment in reserve, and you won’t see that money again until the project closes out.

Retainage works like a security deposit on your labor and materials. It sits on the sidelines for months, sometimes longer, while your payroll and supplier bills keep coming due right on schedule.

That gap can create serious cash flow problems, especially when payroll and supplier bills come due before retainage is released.

Quick note: retainage isn’t required by law — it’s a standard industry practice built into most construction contracts. States do step in to regulate the details once a contract includes it, which we’ll get into below.

What Retainage Means for Your Payments

Retainage is a portion of your contract payment that the owner or general contractor holds back until you finish the work you agreed to do.

Instead of paying you the full invoice amount, they keep a set percentage in reserve.

That reserve doesn’t just disappear. It builds up over the life of the project, a little from every draw — meaning every payment application you submit for work completed so far — and it’s released once the work meets the terms of your contract.

The dollar figures below are just for illustration — your actual draw amounts will vary, but the same percentage math applies no matter the numbers involved.

Say you submit a $100,000 draw on a job with 10% retainage. Depending on where you sit in the payment chain, either the owner withholds retainage from you the general contractor, or the general contractor withholds it from you as a subcontractor.

Either way, whoever is paying you sends $90,000 and holds onto $10,000 — and that happens on every draw, for the length of the project.

By the time a $2 million contract wraps up, you could have $200,000 sitting in reserve, waiting on final approval or for you to close out the punch list — the last few items they want fixed before signing off.

Why Retainage Exists

Construction retainage gives project owners and general contractors financial protection against incomplete work, defective construction and unmet contract obligations.

Retainage gives whoever’s holding it some leverage. If a project doesn’t get finished or issues come up along the way, that withheld money gives them a way to pay someone else to finish or fix the work, instead of trying to recover money they’ve already handed out.

How Retainage Hits Your Cash Flow

Retainage protects whoever’s holding it, but the financial weight of it lands on you. That weight shows up in two places:

1. The cash sitting in your bank account
2. The numbers on your job cost reports

The Cash Flow Gap

Think about a framing crew working a large commercial job. Payroll is due every two weeks, and lumber suppliers expect payment on 30-day terms.

None of that waits for the owner or general contractor to release retainage. That means while you’re earning revenue on paper, a chunk of that money isn’t sitting in your bank account where you need it most.

On a big project, 10% withheld across every single draw can add up to a six-figure gap between what you’ve earned and what’s sitting in your account.

A lot of contractors end up leaning on a line of credit to bridge that gap, which means paying interest on money they’ve already earned.

The Job Costing Problem

Retainage affects construction financial reporting by creating a difference between amounts billed, amounts collected and amounts still owed.

A project might look profitable on paper while a big piece of that revenue is still in reserve. Without a clear number for what’s being withheld, it’s hard to know your real cash position or bid your next job with confidence.

The Rules That Decide When You Get Paid

How much a contract can hold back, and when you get it back, depends on your contract and your state. Retainage itself isn’t required by law, but once your contract includes it, state rules often step in to regulate the details.

Typical Retainage Percentages

Most contracts land somewhere between 5% and 10% retainage.

Public projects tend to sit on the lower end, while private commercial jobs can run higher depending on how much risk the owner or general contractor wants to carry and how well you’ve delivered on past work.

State Caps and Escrow Rules

States don’t leave this entirely up to contract negotiations, either.

Many states cap how much retainage a payer can withhold, especially on public projects. Some require that percentage to drop once a project passes the halfway mark.

A number of states also require retainage funds to sit in an interest-bearing escrow account instead of the payer’s general operating account — a separate account set aside just for that money, so it isn’t mixed in with the payer’s day-to-day cash.

Rules like these vary widely from state to state, so it’s worth checking your own state’s statute or talking to a construction attorney before you sign a contract with unfamiliar terms.

Prompt Payment Deadlines

Beyond percentage caps, most states also have prompt payment laws that set a deadline for releasing retainage once a project reaches substantial completion or final acceptance — the point where the work is finished enough for the owner to use it, even if a few small items are still outstanding.

These laws often require payment within a set number of days after that milestone, and some allow interest penalties if the payer misses that deadline. Knowing your state’s specific timeline gives you a legal leg to stand on if retainage sits past its due date.

Staying Ahead of Retainage

Retainage is built into how construction contracts work. While you can’t always control how much retainage is withheld, you can control how closely you track it and plan for its release.

Start by tracking retainage on its own, separate from your regular receivables, so it never gets lost in the shuffle.

Build the expected retainage timeline into your cash flow forecast before a project even breaks ground. If you’ve built a solid track record with a client, a lower retainage percentage is sometimes on the table when you negotiate your next long-term contract.

Once a project hits substantial completion, send a written request for retainage release so there’s a clear paper trail. Most states’ prompt payment laws start their release-timeline clock from that point forward, so it’s worth knowing that date going in.

Keep your job cost records current so you always know your true financial position, retainage included, at any point in the project.

How FOUNDATION® Helps You Stay Ahead of Retainage

Retainage reduces the cash contractors receive during a project, even as labor, material and equipment expenses continue.

FOUNDATION gives you the job cost accounting and retainage tracking to do that.

Every draw, every dollar withheld and every dollar released stays tied to the project it came from, so you always know your real cash position instead of piecing it together from spreadsheets.

Pair that with FOUNDATION Pay®, our expense and payment platform, and the picture gets even clearer.

It brings your corporate cards, vendor bill pay and accounts payable automation into one place, syncing directly with your job cost data inside FOUNDATION so draws, retainage and day-to-day spending stay connected in real time.

Instead of digging through reports to figure out where your cash stands, you get a real-time view of your job costs as they happen.

If you’re ready to see how FOUNDATION and FOUNDATION Pay work together, talk to an expert and book a demo today.