Law Firms and Attorneys
Law firm accounting demands more than a general bookkeeper can offer. Maspartner brings law firm accounting expertise in trust accounting, matter-based reporting, and compliance built for US firms.
About Trust Accounting and Legal Bookkeeping
Law firm accounting runs on a different set of rules than standard small business bookkeeping. Every state bar in the US requires attorneys to hold client retainers in an IOLTA or separate trust account, reconciled every month, and that requirement applies the same way to a solo practitioner as it does to a forty-attorney firm. A missed reconciliation or an accidental commingling of funds can turn into a bar complaint rather than a simple fix, which is why law firm accounting is treated as a compliance function first and a bookkeeping function second.
We work with solo attorneys, boutique litigation firms, and multi-partner practices across the US, supporting firms on Clio, PCLaw, and MyCase alongside QuickBooks and Xero. Our team understands billable hour tracking, matter-based cost allocation, and the line between operating and client funds — the three areas where law firm bookkeeping most often breaks down. Every engagement follows the same law firm accounting standards, whether accounting for law firms with one attorney or forty.
Services We Provide
Trust account 3-way reconciliation
Client-wise IOLTA records
Earned revenue transfers
Retainer agreements, balances
Invoicing and follow-ups
Unbilled cost tracking
Automated expense tracking
Billable hours tracking
State Bar audit support
Period-end closures
Custom client/case reports
Case tool integrations (Clio, MyCase, etc.)
Periodic transaction recording
Billable hours tracking
Client billing rate calculation
Retainer agreements, balances
Invoicing and follow-ups
Unbilled cost tracking
Automated expense tracking
Bank/card reconciliations
State Bar audit support
Period-end closures
Custom client/case reports
Case tool integrations (Clio, MyCase, etc.)
The Problems We Solve for Law Firms.
Trust Account Errors Risk Your License
We run monthly three-way reconciliations as standard practice, catching discrepancies the month they happen the single most important control in law firm accounting.
Billable Hours Slip Through the Cracks
We build matter-based reporting that flags gaps between time worked and time billed, so law firm accounting data reflects the work actually done.
Slow-Paying Clients Choke Cash Flow
We track receivables by age and run a structured follow-up process, so payments come in on schedule. Receivables management sits inside our law firm accounting services rather than alongside them.
Multi-State Rules Create Compliance Risk
One team manages registration, withholding, and filings across every state involved, keeping law firm accounting consistent across jurisdictions.
In-House Legal Bookkeeping Talent Is Hard to Find
Our team specializes in law firm accounting, so the expertise is already built in.
Benefits of Outsourcing Services
Trust Compliance Confidence
More Billable Time
Improved Cash Flow Visibility
Scalable Accounting Support
Audit-Ready Financial Records
Beyond offering services, we complement your journey with our commitment to Satisfaction
Why Mercurius?
100+ Ratings on Google
Experience the services that’s earned us top ratings.

In-house Remote Bookkeepers
Our professionals are highly qualified and experienced in diverse bookkeeping practices.

Technology-Driven
Technology-Driven Utilize the latest bookkeeping software and tools for accurate and efficient financial management.

Strong Industry Expertise
Our experience across various industries enables us to have a better understanding of your business’s unique challenges and requirements.

Tailored Solutions
We offer customized bookkeeping services that align perfectly with your business needs.
Software Expertise
Other Industries We Serve
Mercurius delivers precise financial solutions backed by industry expertise, ensuring accurate and reliable results across all sectors.

Ecommerce and Retail

Accounting, Tax and CPAs

Law firms and Attorneys

Real Estate and Construction

Education and Coaching

IT and SaaS
Client Testimonials
Great work – love the dedicated member of the team that is assigned to work on my account.
Graham Blair
Habitat Seven Inc 🇨🇦
Manvi and the team at Mercurius are excellent. We have been working with them for a number of years and they have been pivotal in keeping our accounts in good order.
Cameron Kincaid
Chemeyes Ltd 🇬🇧
Siddhartha is delightful to work with and always completes assignments ahead of schedule and with no iteration needed.
Mike Schoenfeld
MBS Consulting🇺🇸
Pleasant to work with, knowledgeable on accounting principles, responsive
Christine Atieno
Keys Please Homes🇺🇸
Sid and his team so excellent work – on time and very attentive to detail.
Joel Cape
Joel E Cape, PLC🇺🇸
Seeking custom services?
Drop your email, and we’ll get in touch, or contact us directly.
Legal Practices We Support
PERSONAL INJURY | FAMILY | CRIMINAL | BANKRUPTCY | ESTATE PLANNING AND ELDER | IMMIGRATION | LABOR/EMPLOYMENT | REAL ESTATE | SOCIAL SECURITY | WORKERS' COMPENSATION | PROBATE | MEDICAL MALPRACTICE | CIVIL RIGHTS | INTELLECTUAL PROPERTY | TRUSTS & ESTATES | CONTRACT | LITIGATION | BANKING & FINANCE | CORPORATE | ENVIRONMENT | CONSTRUCTION | PRODUCT LIABILITY
FAQs
How do I keep my trust account clean enough to avoid a bar complaint over a simple reconciliation error?
The safest approach for law firm accounting is monthly three-way reconciliation between the trust bank account, the client sub-ledger, and the general ledger, done as a standing process rather than a year-end scramble. Most bar complaints trace back to small errors that went unnoticed for months, not deliberate misconduct, which is why consistency in law firm accounting matters more than complexity here.
What can I do when client invoices routinely sit unpaid for 60 to 90 days and cash flow starts to tighten?
Structured accounts receivable tracking is an essential part of effective law firm accounting, where every invoice is aged and followed up on a defined schedule, helping firms catch slow payments before they turn into a cash crunch. Firms that leave AR informal tend to notice the problem only after payroll becomes difficult to cover, which is why AR aging belongs inside the monthly law firm accounting cycle rather than outside it.
Why is it so hard, and expensive, to find in-house staff who actually understand IOLTA reconciliation and legal chart of accounts structure?
General bookkeeping experience does not automatically translate to law firm accounting. IOLTA reconciliation, matter-based cost allocation, and bar-compliant recordkeeping are specialized skills, and firms that hire without confirming this experience often discover the gap during an audit rather than beforehand. Outsourced law firm accounting removes the hiring risk without adding headcount.
How much does outsourced accounting cost for a small law firm?
Pricing depends on transaction volume, trust account complexity, and whether payroll is included, and most firms pay a monthly fixed fee for law firm accounting rather than an hourly rate. Solo practitioners typically pay less than firms with multiple partners and associates, since matter volume and reconciliation complexity scale with headcount, so law firm accounting costs track firm size more closely than hours worked.
Is it safe to outsource trust accounting to a firm outside the US?
Trust account data security and compliance depend on the provider’s process, not their location. Firms should confirm the outsourced law firm accounting team follows US state bar trust accounting rules specifically, uses secure data handling protocols, and has documented experience with IOLTA reconciliation before handing over access. A provider that treats law firm accounting as a specialization rather than an add-on is the safer choice.Trust account data security and compliance depend on the provider’s process, not their location. Firms should confirm the outsourced law firm accounting team follows US state bar trust accounting rules specifically, uses secure data handling protocols, and has documented experience with IOLTA reconciliation before handing over access. A provider that treats law firm accounting as a specialization rather than an add-on is the safer choice.
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