How to Accept Credit Card Payments at Your Law Firm (and Keep Trust Funds Safe)

Most clients would rather pay a legal bill with a card than write a check. For a law firm, card payments mean money arrives in days instead of weeks, and the billing team spends less time chasing invoices. The catch is the trust account. A card payment that lands in the wrong account, a processing fee taken from a client's retainer, or a chargeback that pulls money out of trust can turn a simple payment into a compliance problem.

This guide explains how to accept credit card payments at your law firm step by step, and how to set things up so client trust funds stay protected. It covers what the rules say, where each type of payment should go, how card fees and chargebacks work, and what your accounting team needs to do after a payment comes in.

Can law firms accept credit cards?

Yes. Law firms in every US state can accept credit card payments for legal fees and costs. What the rules control is how the payments are handled: which account the money goes into, who pays the processing fees, and how chargebacks and refunds are managed.

What the ABA Model Rules say

Two ABA Model Rules apply most directly to card payments.

ABA Model Rule 1.15 covers client property. It requires lawyers to keep client funds separate from the firm's own money. Advance fees and costs paid by a client belong in a client trust account and can be withdrawn only as fees are earned or expenses are incurred. Rule 1.15(b) allows a lawyer to keep only enough of the firm's own money in trust to cover bank service charges.

ABA Model Rule 1.5 covers fees. It requires fees and expenses to be reasonable and the basis for them to be explained to the client, preferably in writing. This matters if you plan to pass card processing fees on to clients.

Rules vary by state

Each state adopts its own version of these rules, and many state bars have issued ethics opinions on credit card payments. Some states allow firms to pass card fees to clients, some limit it, and some have specific rules on how chargebacks must be handled. Before you set up card payments, check your state bar's trust accounting rules and any ethics opinions on credit cards.

Earned vs. unearned fees: where each card payment should go

The most important question for any card payment is whether the money has been earned yet. That decides which account it goes into.

Unearned fees go into trust

A retainer, an advance fee deposit, or money paid in advance for costs like filing fees has not been earned yet. It still belongs to the client, so it must be deposited into the client trust account (an IOLTA account or a separate interest-bearing trust account). It moves to the firm only after the work is done and the client is billed.

If you're not sure how interest on these accounts works, our guide on who gets the interest on a law firm trust account explains it.

Earned fees go into operating

A payment against an invoice for work already done is earned. It belongs to the firm and goes into the firm's operating account. Depositing earned fees into trust and leaving them there is commingling, which is one of the most common trust accounting violations.

Some flat fees may be treated as earned when received, but only where your state allows it and the engagement letter says so. When in doubt, treat a payment for future work as unearned.

Why you need two merchant accounts

If your firm accepts card payments for both retainers and invoices, you need two separate merchant accounts with your payment processor. One deposits into the trust account. The other deposits into the operating account.

You can't take every card payment into one account and move it later. Running earned fees through trust, or retainers through operating, mixes client money with firm money even if it's only for a day. Each payment needs to go straight to the right account when the client pays.

How to accept credit card payments at your law firm, step by step

Step 1: Check your state bar rules

Read your state's version of Rule 1.15 and look for ethics opinions on credit cards. Note three things: whether card fees can be passed to clients, how chargebacks against trust must be handled, and whether your state treats any flat fees as earned on receipt.

Step 2: Decide what clients can pay by card

Most firms accept cards for some or all of the following:

Write down which payments go where. This becomes part of your billing policy and the instructions for your billing team.

Step 3: Choose a legal payment processor

There are three main types of payment processors:

For any firm that takes retainers by card, a processor that understands trust accounting is the safer choice. See the checklist later in this post.

Step 4: Connect trust and operating accounts

Set up two merchant accounts with your processor: one linked to your trust account, one linked to your operating account. Make sure all processing fees, monthly fees, and chargebacks are charged to the operating account, never to trust. Confirm this in writing with the processor before you take your first payment.

Step 5: Update your engagement letter

Add your payment terms to the engagement letter: the payment methods you accept, whether a card fee applies and how much, how retainers are held and applied, and that the client agrees not to dispute charges for work performed without first contacting the firm. Clear terms reduce disputes and support you if a chargeback happens.

Step 6: Add payment links to invoices and your website

Put a "pay now" link on every invoice and in invoice emails. Add a payment page to your website and a link in your retainer request. Make sure each link sends money to the right account. A retainer link should deposit to trust. An invoice link should deposit to operating.

Step 7: Tell your clients

Let current clients know they can now pay by card through a note on the next invoice and an email. Mention it in the intake call for new clients. Clients can only use a payment option they know about.

Step 8: Train your team

Everyone who takes or records payments needs to know which account each payment goes to, how to process a refund, and what to do when a chargeback notice arrives. Write it down so the process doesn't depend on one person.

How to keep trust funds safe when accepting credit cards

Accepting cards for retainers is safe when the trust account is protected from fees, chargebacks, and mix-ups. These are the rules to follow.

Never take processing fees from trust

If a client pays a $5,000 retainer and the processor deposits $4,850 after fees, the client's trust balance is short by

50. That shortfall is the firm's problem to fix, and in many states it's a violation. Processing fees should always be charged to the operating account so the full amount the client paid lands in trust.

Protect trust from chargebacks

If a client disputes a retainer payment after some of the money has been earned and moved to operating, the processor may pull the full amount back from trust. That money would come from other clients' funds. Set up your processor so chargebacks are taken from the operating account, or cover any chargeback against trust immediately from operating.

Don't route payments through the wrong account

Earned fees should never sit in trust, and retainers should never land in operating, even briefly. If a payment goes to the wrong account by mistake, fix it right away, document what happened, and record the correction on the client ledger.

Refund unused retainers to the card correctly

When a matter ends and the client has money left in trust, refund it from the trust account. If the client paid by card, many processors refund back to the same card. Record the refund on the client's trust ledger, and make sure the processor takes the refund from trust only for that client's balance.

Record every card payment on the client ledger

Each retainer paid by card has to appear on the right client's trust ledger, with the date, amount, and payment method. Without this, the trust account can't be reconciled. Our post on common trust accounting mistakes covers what happens when ledgers fall out of sync.

Credit card fees for lawyers

Every card payment has a cost. Knowing how that cost is built helps you pick the right processor and decide whether to pass fees to clients.

How card processing fees work

When a client pays by card, several parties take a share. The bank that issued the client's card charges an interchange fee. The card network adds a smaller assessment fee. Your processor adds its own markup. Fees are usually higher for rewards cards, corporate cards, and card numbers typed in by hand than for standard debit cards.

Common pricing models

Processors usually charge in one of three ways:

  • Flat rate: the same percentage, sometimes plus a small per-transaction fee, on every payment. Easy to understand and budget for.
  • Interchange-plus: the actual interchange cost plus a fixed markup from the processor. Often cheaper for firms with higher payment volumes, but statements are harder to read.
  • Tiered: payments are sorted into groups like "qualified" and "non-qualified," each with its own rate. Hard to predict, because the processor decides which tier each payment falls into.

Hidden costs to ask about

Before signing, ask about monthly or annual fees, monthly minimums, chargeback fees, PCI compliance fees, early termination fees, and fees for each batch of deposits. These can add more to your cost than the headline rate.

How to work out your real cost

Take the total fees on your monthly statement and divide by the total amount processed that month. If you processed $80,000 and paid $2,400 in fees, your real rate is 3%. Check this every month, especially after your volume grows, and use it to negotiate.

Can you pass credit card fees to clients?

In many states, yes, as long as the fee is reasonable, disclosed in advance, and agreed to by the client in writing. Some states don't allow it, and card network rules add their own limits. There are three common ways to do it.

Surcharges

A surcharge is an extra charge added to a card payment to cover the processing fee. Card networks cap how much can be added, require notice to the client, and don't allow surcharges on debit cards. Some states restrict surcharges altogether. Check your state law and your processor's rules before adding one.

Convenience fees

A convenience fee is a flat fee for paying through a channel other than the firm's standard method, such as paying online instead of by check. Card network rules on convenience fees are specific, so confirm with your processor how they apply to you.

Discounts for ACH or check

Instead of adding a fee for cards, some firms offer a small discount to clients who pay by ACH or check. This lowers the firm's costs without adding a charge to anyone's card.

Whichever approach you choose, put it in the engagement letter and show the fee clearly on the invoice or payment page. And never take any fee the client pays for card processing out of trust. Our guide on how to pass credit card processing fees to clients without breaking trust rules goes into more detail.

How to handle chargebacks at a law firm

A chargeback happens when a client disputes a card payment with their card issuer, and the issuer takes the money back from the firm. For law firms, chargebacks are a trust accounting risk as well as a lost payment.

How to prevent chargebacks

  • Get a signed engagement letter that explains fees and payment terms before taking a card payment.
  • Make sure the name that shows on the client's card statement is one they'll recognize as your firm.
  • Send a receipt for every payment.
  • Give notice before charging a card saved on file.
  • Send clear invoices with detailed time entries, so the client can see what they paid for.
  • Answer billing questions quickly. Many chargebacks start as unanswered questions.

How to respond to a chargeback

You'll usually have a limited number of days to respond, so act on the notice right away. Send the processor the signed engagement letter, the invoice, the time entries, the receipt, and any emails showing the client approved the work or the payment. If the chargeback is valid, accept it and fix the records.

How to record a chargeback on a retainer

If a chargeback hits a retainer that was paid into trust:

  1. Check whether any of that retainer has already been earned and moved to operating.
  2. If the processor took the money from trust, replace any shortfall in other clients' money from operating right away.
  3. Record the chargeback on the client's trust ledger, along with any transfer from operating.
  4. Document what happened and the steps you took.
  5. If your state requires it, report any trust overdraft to the bar.

The simplest protection is setting up the processor so chargebacks are always taken from operating. Our post on how to handle a bounced client payment or card chargeback walks through the full recovery process.

How card payments fit into your law firm accounting

Taking the payment is only half the job. The accounting team still has to record it, match it, and reconcile it. This is where card payments most often cause problems for growing firms.

Match each payment to an invoice or retainer

Every card payment should be tied to a client, a matter, and either an invoice (operating) or a retainer request (trust). Unmatched payments sit in a suspense account until someone figures out who paid what, and trust ledgers can't be reconciled while they're there.

Watch for batch deposits and processor holds

Processors often deposit several days of payments as one lump sum, and some hold funds for a day or more before depositing. So the bank statement may show one deposit of

2,400 that's actually six client payments. Your records need to show each payment separately so you can match them to the deposit.

Include card payments in your three-way reconciliation

Each month, the trust bank statement, the trust account journal, and the total of all client ledgers must match. Card payments that were deposited but not recorded, recorded but not yet deposited, or recorded on the wrong client ledger will all show up as differences. Our guide to three-way reconciliation for a trust account walks through how to find and fix them.

Keep billing and accounting connected

When payments come in through one tool and the books are kept in another, someone has to move every payment across by hand. That's slow, and it's where payments get recorded twice, recorded on the wrong matter, or missed. Our post on legal accounting software vs. practice management software explains why this matters as a firm grows.

Card payment security and fraud

PCI compliance

Any business that accepts cards has to follow the Payment Card Industry Data Security Standard (PCI DSS). The simplest way to stay compliant is to never store full card numbers yourself. Use a processor that stores saved cards securely on its own systems, and never write card numbers in emails, notes, or spreadsheets.

Fraud red flags for law firms

Law firms are a target for payment scams because they handle large sums and trust accounts. Watch for:

  • A new client who pays a large retainer right away, then asks for a refund to a different card or bank account
  • An overpayment followed by a request to send back the difference
  • A payer name that doesn't match the client
  • Pressure to refund quickly before a payment has fully cleared
  • Several cards tried in a row for the same payment

When something looks off, wait until the payment has fully cleared before refunding or disbursing anything from trust.

Other payment options to offer: ACH, eCheck, and payment plans

Cards aren't the only electronic option, and for large payments they're usually not the cheapest.

ACH and eCheck payments move money directly from the client's bank account. Fees are usually lower than card fees, which makes ACH a good choice for large retainers and settlements. ACH payments take a few business days to clear and can be returned if the client's account doesn't have enough money, so wait for funds to clear before using them.

Payment plans let clients pay a large fee in smaller installments. Saving a card or bank account on file, with the client's written permission, makes installments easier to collect. Payment plans are for earned fees or fees as they're earned. They shouldn't be used to move unearned money out of trust early.

What to look for in a legal payment processor

Before you sign with a payment processor, check that it:

  • Keeps trust and operating deposits in separate merchant accounts
  • Charges all fees to the operating account, never to trust
  • Takes chargebacks from the operating account
  • Deposits the full payment amount into trust
  • Accepts cards and ACH
  • Lets you put payment links on invoices and your website
  • Records each payment against the client and matter
  • Connects to your billing and accounting system, so payments don't have to be entered twice
  • Stores card details securely and is PCI compliant
  • Shows clear pricing, with no long contract or early termination fee

How LawAccounting handles card payments and trust funds

Most card payment problems at law firms come from the gap between where the payment is taken and where the books are kept. LawAccounting closes that gap by keeping payments, trust, and accounting in one platform.

Clients pay through LawAccounting's Online Payments. Because Billing and Invoicing, Trust Accounting, and Banking and Reconciliation are part of the same system, payments are recorded where the firm's books and client ledgers are kept, without being entered a second time. Financial Reporting gives firm administrators and finance leads a clear view of what's been paid, what's in trust, and what's still outstanding.

If you're comparing options, our guide to attorney trust accounting software covers what to look for.

See how LawAccounting handles online payments and trust accounting for your firm.

Book a demo

Frequently asked questions

Can law firms accept credit cards?

Yes. Law firms in every US state can accept credit cards for legal fees and costs. The rules focus on how the payment is handled: unearned fees go into the trust account, earned fees go into the operating account, and processing fees and chargebacks must not reduce client funds held in trust.

Can a client pay a retainer with a credit card?

Yes. A retainer paid by card is unearned, so it must be deposited into the client trust account in full. Processing fees should be charged to the firm's operating account, not taken out of the retainer.

Who pays the credit card processing fee on a trust deposit?

The firm does, from its operating account. If fees are taken from a trust deposit, the client's trust balance ends up short. Some states let firms pass the fee on to the client as a separate charge, but it still can't be deducted from trust.

Can lawyers charge clients a credit card fee?

In many states, yes, if the fee is reasonable, disclosed in advance, and agreed in writing. Some states don't allow it, and card networks limit surcharges and don't allow them on debit cards. Check your state bar's rules and your processor's terms.

Why do law firms need two merchant accounts?

One merchant account deposits retainers into the trust account, and the other deposits earned fees into the operating account. Using one account for both would mix client money with firm money.

What happens if a client disputes a credit card payment made to trust?

The card issuer may take the money back from the firm. If it comes out of trust after some of the retainer has been earned, it can use other clients' money. The firm must replace any shortfall from operating right away, record the chargeback on the client ledger, and report a trust overdraft if the state requires it.

Is ACH better than credit cards for law firms?

ACH usually costs less than card processing, which makes it a good option for large retainers and settlements. It takes a few business days to clear and can be returned if the client's account is short, so wait until funds clear before using them.

Can I use a general payment app for my law firm?

You can for earned fees if the app deposits into your operating account. For retainers, most general apps aren't a safe choice, because they deduct fees from each deposit and can't keep trust and operating money separate.

How do I refund a retainer that was paid by credit card?

Refund the unused balance from the trust account, usually back to the same card through your processor. Record the refund on the client's trust ledger and confirm the amount matches what remains in that client's trust balance.

Do law firms need to be PCI compliant?

Yes. Any business that accepts cards must follow PCI DSS. The easiest way to stay compliant is to let a secure processor store card details and never store full card numbers in your own files or emails.

Make card payments easy for clients and safe for trust

Accepting credit cards helps clients pay faster and cuts the time your team spends chasing invoices. The risk sits almost entirely in the trust account, and most of it can be handled at setup: two merchant accounts, all fees and chargebacks charged to operating, and every payment recorded on the right client ledger.

Start by checking your state bar's rules, then choose a processor that understands trust accounting. Once payments flow into the same system as your books, card payments stop being a reconciliation headache and become one more way clients pay on time.