Best invoice factoring for construction contractors

The best invoice factoring for a contractor comes from a company that understands construction: progress billing, retainage, lien waivers and pay-when-paid clauses. Many general factors won't buy construction invoices at all, or only buy invoices for completed work. If your invoices can't be factored or you need money before you can bill, Merchant Fund Express, our recommended funder, reviews your sales and deposits with credit from FICO 500. And if your company is established, an accounts receivable line of credit usually costs less than factoring.

Below you'll find the ranked list, a table by criteria, which construction invoices can and can't be factored, and the mistakes that cost the most.

The best factoring options for contractors, ranked

How we rank: no ratings or scores. We compare every option on the same criteria: speed, minimum time in business, minimum credit, ITIN acceptance or owners without an SSN, documents required, amounts and collateral. We only publish details about other companies that we verified on their official sites; if we couldn't confirm it, we left it out. See how we rank business funding options.

1. Merchant Fund Express (recommended funder). Factoring can't always be used: there's no invoice yet, the invoice carries retainage, the contract bars assigning payment, or the GC won't accept a factor's notice. For those cases, we recommend capital based on your sales and deposits. It handles $5,000 to $5,000,000, accepts credit from FICO 500, and decisions often come in 2 to 4 hours. In most cases no collateral is required, it accepts applicants with an ITIN (no SSN needed), offers Spanish-speaking support, and applying is free with no impact to your credit.
2. Construction-focused factor. It knows pay applications, asks for the right lien waivers and knows how to deal with GCs and owners. It usually advances a lower percentage than in other industries because the risk of disputes is higher, but it accepts what other factors turn down.
3. Spot (single-invoice) factoring. You sell one specific invoice without committing to factor all of them. It costs more per invoice, but it gives you freedom if you only have a one-time gap, like a big payment from a slow-paying GC.
4. Accounts receivable line of credit. Instead of selling your invoices, you use them as collateral for a line. It's usually cheaper than factoring, but it requires clean books, A/R aging reports and, at banks, years of history.
5. SBA 7(a) Working Capital Pilot line. According to sba.gov, these are monitored lines of credit up to $5 million with a maximum term of 60 months, designed for businesses with at least one year of operations that want to perform on large contracts or projects and borrow against receivables or inventory. They require current financial statements and reporting, and since March 2026 every owner must be a U.S. citizen or national.
6. Mobilization payment in the contract. It's not financing, but it's the cheapest option: negotiating an upfront payment from the owner or GC for materials and startup costs. Get it written into the contract.

Comparison by criteria

Relative cost is a general reference, not a quote. Every factor and lender prices based on the risk of your receivables.

Which construction invoices can be factored

• Yes, most easily: invoices for completed, accepted work, billed to commercial customers with good payment history and no open disputes.
• Yes, with a construction factor: progress billings approved by the GC or owner, with a conditional lien waiver.
• Hard or no: retainage, which is paid at the end of the job; invoices to residential customers; disputed invoices; work on unsigned change orders.
• Check your contract: some contracts prohibit assigning payments to third parties or require the GC's consent. Government contracts have their own rules for assigning payments, so review them before offering those invoices to a factor.

A pay-when-paid or pay-if-paid clause also matters: if the GC only pays you when the owner pays them, the factor will look at both of their credit. More background in our guide to invoice factoring for construction.

Example: where the cash gap opens on a job

For example, picture a drywall sub who wins a three-month commercial job. In week 1, they buy material and start paying payroll every Friday. At the end of month 1, they submit their first pay app; the GC reviews it and rolls it into its own billing to the owner. If the contract says the GC pays 30 days after the owner pays, the first check might arrive in month 3, after the sub has paid for most of the job out of pocket. And the retained percentage only comes when the project closes out.

In that case, each piece has its own tool: the mobilization payment covers week 1 material; factoring approved progress billings covers payroll in months 2 and 3; and retainage waits. If the GC won't accept factoring, sales-based capital or a line of credit covers the gap. Mapping this calendar before you sign a job tells you how much you need and when, instead of finding out on a Friday with no cash for payroll. For more ways to fund jobs, see construction contractor financing.

Recourse or non-recourse: which fits you

With recourse factoring, if your customer doesn't pay, you pay the factor back. With non-recourse factoring, the factor takes on part of that risk, usually only if the customer doesn't pay because of insolvency, not because of a dispute about your work. In construction, almost everything that goes wrong is a dispute (incomplete work, change orders, defects), so non-recourse protects you less than it seems and usually costs more.

Always ask: What happens if the GC withholds payment over a dispute? How many days do I have to buy back the invoice? Are there extra fees in the meantime? We compare both structures in recourse vs. non-recourse factoring.

How to choose a factor for your construction company

1. Confirm it works in construction and with your type of customer (GCs, commercial owners, government).
2. Ask what percentage it advances on progress billings and whether it excludes retainage.
3. Get the full fee list: discount per period, setup, verification and transfer fees.
4. Review the contract term and exit: monthly volume minimums, cancellation penalties and whether you must factor all your invoices.
5. Ask how it contacts your customers. The notice to the GC or owner should be professional so it doesn't damage the relationship.
6. Compare with a bank line if you have history and clean books.

Mistakes that cost the most

• Factoring everything out of habit. If your customer pays in 15 days, factoring that invoice just eats your margin.
• Leaving the cost out of your bid. If you'll factor a job, build that cost into the bid.
• Not tracking retainage. It's often your profit; note when it's released and collect on time.
• Signing unconditional lien waivers before you're paid. Talk to a construction attorney about your state's rules.
• Mixing factoring and advances on the same receivables. It can violate your agreement with the factor.

If your invoices can't be factored or you need money before you can bill, you can apply with Merchant Fund Express; it's free and won't affect your credit. Prefer Spanish? Leer en español.