California has a massive freelance economy — and also some of the most specific rules around late fees and interest charges. If you're a freelancer based in California or working with California clients, here's what you need to know to charge late fees legally and actually collect them.

California's Interest Rate Limits

California has strict usury laws that cap interest rates — but they apply differently depending on who your client is.

If your client is a business entity (LLC, corporation, or other commercial entity), California's usury law generally does not apply to your invoice. You can charge whatever late fee rate you and the client agreed to in writing — and 1.5% per month is the common, widely accepted rate. Use our Late Payment Fee Calculator to see exactly what your client owes at any rate you set.

If your client is an individual consumer, California caps interest at 10% per year in most situations under Article XV of the California Constitution. This matters if you're freelancing directly for individuals — photographers working with couples, designers working with individual clients, and so on.

The practical rule: For business clients, 1.5%–2% per month is fine. For individual consumers in California, stay at or below 10% annually to be safe. When in doubt, consult a California-licensed attorney.

California AB 5 and Freelancer Classification

California's AB 5 law changed how workers are classified in the state. While it's primarily about whether you're an employee or independent contractor, it has implications for how you structure your freelance agreements. If you're clearly operating as an independent business — with a written contract, multiple clients, and control over your work — late fee clauses are much more straightforward to enforce.

The cleaner your freelance setup (written contracts, separate business name or LLC, professional invoicing), the easier it is to enforce your payment terms.

California's Freelance Worker Protection Act (SB 988)

Separately from AB 5's classification test, California has its own version of a "Freelance Isn't Free" law: the Freelance Worker Protection Act (SB 988), effective for any contract signed or renewed on or after January 1, 2025. It gives you a direct, contract-based enforcement path that AB 5 never did.

The catch: SB 988 only covers specific "professional services." Unlike Illinois and New York's broader freelance definitions, California's law lists specific covered categories under Labor Code §2778(b)(2) — including marketing, HR administration, graphic design, fine art, writing and copy editing, photography and video editing, tax preparation, appraising, and a handful of other fields. If your work doesn't fall into one of these listed categories, SB 988 may not apply to you directly, even though ordinary contract law and late fee clauses still do.

How to Set Up Late Fees in California

The golden rule is the same everywhere: put it in writing before you start work.

Can You Charge 5% a Day, 10% a Month, or Daily Interest in California?

These are the questions California freelancers and small business owners actually type into search, so here are direct answers.

Is there a legal cap on late fees on invoices in California? For a business client, there's no fixed percentage in a statute. The limit is reasonableness: under Civil Code § 1671(b), an agreed charge for late payment in a non-consumer contract is valid unless the client shows it was unreasonable when the contract was made. For individual consumers the rules are tighter — § 1671(d) and the 10% constitutional ceiling above — so stay at or under 10% a year there.

Can I charge 5% per day? Almost certainly not in a way a court will enforce. Five percent a day is 150% a month and over 1,800% a year on a $1,000 invoice — that's $50 every day it sits. A fee that grows that fast stops looking like compensation for waiting and starts looking like a penalty, which is exactly what § 1671 lets a court strike. The same goes for 10% a month (120% a year). Our daily late fee checker converts any daily or monthly figure into an annual rate so you can see where it lands.

What if my contract says nothing about late fees? You can't add one to an invoice after the fact and expect it to stick — a late fee is a contract term, and both sides have to agree to it before the work. What you do get automatically is interest: Civil Code § 3289(b) sets 10% a year from the date of breach on a contract that doesn't state a rate. That's roughly 0.83% a month, and you can name it in a demand letter.

Can I charge a late fee as a 1099 independent contractor? Yes. As a 1099 contractor you are the business, and your client is your customer — the same rules apply to you as to any vendor. Put the rate in the contract and on every invoice. If your work falls under SB 988's covered categories, you also get the statute's 30-day default payment deadline and double damages on top.

The safe California clause for business clients: "Invoices unpaid 30 days after the due date accrue interest at 1.5% per month (18% per year) on the overdue balance." It's stated monthly, agreed in advance, and close to what businesses commonly charge each other — which is the whole reasonableness test.

Collecting Late Fees: What Actually Works

California Small Claims Court handles disputes up to $12,500 for individuals ($6,250 for businesses filing as an entity). For amounts above that, you'd go to Superior Court — which typically requires a lawyer for anything complex.

For most freelance disputes, small claims is the right move. Here's the process:

Practical Steps Before You Escalate

Most late payment situations resolve before you need a court. In order:

Want to see exactly how much your California client owes in late fees? Calculate it by the day with our free tool.

Calculate Late Fees →

If you invoice through software rather than by hand, it's worth checking whether your tool actually applies this fee automatically — not every invoicing tool that markets "automatic" late fees actually automates them.

One Thing Most California Freelancers Overlook

California law allows you to recover attorney's fees in some contract disputes if your contract includes a fee-shifting clause. Adding a line like "In any dispute arising from this agreement, the prevailing party shall be entitled to recover reasonable attorney's fees" can make clients think twice before ignoring your invoices — and it protects you if you ever need to escalate.

You don't need to be a lawyer to include this language. Just make sure it's in the contract both parties sign before work begins. One thing to know: under Civil Code § 1717, a contract attorney's-fee clause works both ways in California — even if it's written to favor only you, the court treats it as reciprocal, so a client who wins gets their fees too. It's a reason to file only when your paperwork is solid, not a reason to leave the clause out.

See how California's SB 988 compares to Illinois's and New York's freelance protection laws in our full Freelance Isn't Free Act guide.

Frequently Asked Questions

What interest rate can I charge on late invoices in California? +

It depends on your client. For business entities (LLCs, corporations), California's usury law generally doesn't apply, so you can charge whatever late fee rate you and the client agreed to in writing — 1.5% to 2% per month is standard. For individual consumer clients, California caps interest at 10% per year under Article XV of the state constitution.

How does California's small claims limit compare to nearby states? +

California's $12,500 small claims limit for individuals is higher than any neighboring state's — above Nevada's $10,000 and more than three times Arizona's $3,500 cap. Businesses filing in California small claims are limited to $6,250 instead, so check which category applies to you before filing.

Does California's Freelance Worker Protection Act (SB 988) apply to me? +

It applies if your contract is worth $250 or more (single or aggregated over 120 days) and your work falls under one of the specific "professional services" categories listed in Labor Code §2778(b)(2) — including marketing, graphic design, fine art, writing/copy editing, photography/video editing, tax preparation, and a few other fields. If you qualify, you're entitled to a written contract, payment within 30 days by default, and double damages if a client doesn't pay. If your field isn't on the list, ordinary contract law and late fee clauses still protect you — you just don't get SB 988's specific remedies.

Can I charge a 5% per day late fee in California? +

Almost certainly not enforceably. Five percent a day is over 1,800% a year. Under Civil Code § 1671(b), an agreed late charge in a business contract is valid unless it was unreasonable when the contract was made, and a fee that grows that fast reads as a penalty rather than compensation. The same problem applies to 10% a month, which is 120% a year. A monthly rate around 1.5% is the common, defensible choice for business clients.

What late fee can I charge in California if my contract doesn't mention one? +

You cannot add a late fee after the fact, because it is a contract term both sides must agree to in advance. You are still entitled to interest: Civil Code § 3289(b) sets 10% a year from the date of breach when the contract does not state a rate.

Can I charge a late fee as a 1099 contractor in California? +

Yes. A 1099 independent contractor is a business, and the same late fee rules apply as for any vendor: agree the rate in writing before the work and state it on each invoice. If your work is in a category covered by SB 988, you also get its 30-day default payment deadline and double damages for non-payment.