Construction and contracting businesses have a cash flow structure unlike almost any other small business: you don’t get paid when the work happens, you get paid when a milestone is inspected, approved, and invoiced — and a real slice of what you’ve earned gets held back until the entire job is done.
What Retainage Actually Withholds
Retainage is the portion of each progress payment a client withholds until a project is substantially complete, and it’s typically 5% to 10% of every invoice. Average builder profit margins run around 11%, which means the retainage withheld on a job can be close to the entire profit a contractor is supposed to earn on it — money that’s fully earned, fully invoiced, and still not in the bank until final signoff, sometimes months after the work itself wrapped.
Retainage Caps Are Changing in 2026
Several states have moved to cap how much can be withheld. California’s SB 61 limits retention on most new private construction contracts to 5% of each progress payment and the total contract price, effective January 1, 2026 — down from the 10% that had been the industry norm — following similar 5% caps already in place in New York and Washington. If you contract in a state without a cap, negotiating a lower retainage percentage into the contract itself is one of the few cash-flow levers available before the job even starts.
Why Progress Billing Creates Cash Flow Gaps Even When a Job Is Profitable
Unlike subscription or recurring-revenue businesses, a contractor’s billing is triggered by milestones, inspections, and client approvals — all points that can slip for reasons entirely outside the contractor’s control. Payroll and material costs don’t wait for an inspection to get rescheduled; they’re due on their own calendar regardless of where the billing cycle sits. Slow payment across the construction industry isn’t a fringe problem either — it cost the industry an estimated $280 billion in delayed cash in a single recent year, according to industry payment-tracking research.
Managing the Gap
A rolling cash flow forecast built around your specific contract milestones — similar in spirit to the 13-week cash flow model used by small businesses generally, but keyed to draw schedules and retainage release dates instead of calendar weeks — lets you see a gap coming before it becomes a missed payroll. A revolving line of credit sized specifically to bridge the retainage-holdback period, rather than to fund general operations, is the tool most contractors reach for once they’ve been burned by the gap once.
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