The departments inside a law firm fall into two groups: practice departments where attorneys do legal work for paying clients, and business departments that keep the firm itself running. A mid-size or large firm might have a dozen or more of them, from litigation teams and transactional groups to accounting, conflicts, HR, IT, knowledge management, marketing, and professional development. Each exists for a reason specific to legal practice, and several of them operate under ethical rules that do not apply to businesses in other industries.
Who Runs the Firm
Someone has to decide which departments get funded, which practice groups get new hires, and who sits on which committee. Firms typically answer that through one of three governance models: a single managing partner with broad authority, an executive committee of several partners splitting responsibility across finance, personnel, and administration, or a full-partnership vote on major decisions. The last model works in small firms and becomes unwieldy as headcount grows.
Below the top layer, practice group leaders coordinate the attorneys inside a given legal specialty. They assign work, evaluate performance, and push for new business within their group. The layered structure keeps senior attorneys billing hours instead of sitting in management meetings.
The Practice Departments
Practice departments generate virtually all of the firm’s revenue. Most firms sort their practicing attorneys into two broad camps: litigation and transactional. Litigation handles disputes, from pre-suit investigation through trial and appeal, which means pleadings, document-heavy discovery, depositions, and motion practice. Transactional lawyers structure deals, draft contracts, and shepherd clients through regulatory approvals. The skill sets are different enough that firms rarely ask the same attorney to do both.
Inside those two camps sit specialty teams: intellectual property, employment, real estate, tax, environmental compliance, mergers and acquisitions, and others, depending on the firm. A corporate acquisition might pull in the M&A team, the tax group, and an environmental specialist before closing. That kind of cross-group collaboration is one of the main reasons clients hire large firms instead of solo practitioners.
Paralegals and Legal Support
Paralegals and legal assistants do a substantial share of the hands-on work in every practice department. They draft initial versions of documents, organize case files, schedule meetings, handle correspondence, and manage incoming filings. Experienced paralegals in litigation or real estate often know the procedural requirements better than junior associates do. They cannot give legal advice, appear in court, or set fees, and the supervising attorneys bear ethical responsibility for the work paralegals produce. Firms are required to put systems in place that ensure nonlawyer staff follow the same professional conduct standards the attorneys are bound by.1American Bar Association. Model Rules of Professional Conduct Rule 5.3 – Responsibilities Regarding Nonlawyer Assistance
How the Work Gets Billed
Hourly billing is still the dominant fee model. As of 2025, the national average hourly rate for an attorney sits around $349, and senior partners at large firms in major markets can exceed $1,300 per hour. Attorneys track time in six-minute increments, so every call, email, and document review gets recorded as at least one-tenth of an hour, and clients receive itemized statements.
Flat fees are common for predictable work: a basic will, an uncontested divorce, forming a business entity. Contingency fees, where the attorney collects a percentage of the recovery instead of billing hourly, dominate personal injury and similar plaintiff-side work. The standard cut is roughly one-third of the settlement if the case resolves before trial, rising to around 40 percent if it goes through a full jury trial. Some practice areas have statutory caps on contingency percentages.
Finance and Accounting
The finance department pays vendors, processes payroll, and converts attorney time entries into client invoices. It also manages some of the most ethically sensitive money in the legal system.
Client Trust Accounts
When a client pays a retainer or the firm receives settlement funds, that money cannot sit in the firm’s regular bank account. Professional conduct rules require lawyers to hold client property in a separate trust account, completely walled off from firm operating funds.2American Bar Association. Model Rules of Professional Conduct Rule 1.15 – Safekeeping Property The firm can only withdraw as fees are actually earned or expenses incurred. Interest generated on these pooled trust accounts flows into state IOLTA programs that fund pro bono legal services and other public interest work.3American Bar Association. A Guide to Ensuring IOLTA Account Compliance Mixing client funds with firm money, even briefly or by accident, is one of the fastest paths to disciplinary action and potential disbarment.
Partner compensation is a separate finance function. Some firms use a lockstep model where partners at the same seniority level earn equal shares; others tie compensation to the revenue each partner generates. Most firms land somewhere between the two, blending seniority with performance metrics.
Conflicts and Risk Management
This department wields more quiet power than its size suggests. Before the firm can accept any new client or matter, a conflicts check has to clear. Staff run the prospective client’s name, the opposing parties, and all related individuals and entities through a database containing every client relationship the firm has ever had. The goal is to catch situations where representing the new client would be directly adverse to a current or former client, or where the firm’s obligations to one client could limit what it does for someone else.4American Bar Association. Model Rules of Professional Conduct Rule 1.7 – Conflict of Interest Current Clients
The stakes are real. Under the rules governing imputed conflicts, one lawyer’s conflict is generally attributed to every lawyer in the firm. If a single partner previously represented a company and the firm later takes on a case against that company, the whole firm may be disqualified unless specific screening procedures are followed.5American Bar Association. Model Rules of Professional Conduct Rule 1.10 – Imputation of Conflicts of Interest General Rule Larger firms typically require someone other than the attorney bringing in the new work, often a new business acceptance committee or a practice group leader, to sign off before a matter can be opened.
Risk management extends past conflicts. Partners and senior lawyers carry personal liability for the ethical conduct of the people working under them, and firm leadership must put measures in place to ensure every lawyer follows the rules of professional conduct.6American Bar Association. Model Rules of Professional Conduct Rule 5.1 – Responsibilities of Partners Managers and Supervisory Lawyers Many mid-size and large firms employ a general counsel or a dedicated risk team that monitors malpractice exposure, reviews engagement letters, oversees the firm’s own insurance, and trains staff on evolving ethical obligations.
Operations: HR, IT, and Facilities
Human resources handles recruitment, onboarding, benefits, payroll compliance, and employee relations. Onboarding at a law firm goes beyond what most industries require because new hires will have access to privileged client information, so credential verification and background screening get more attention. HR also runs performance reviews, handles internal complaints, and keeps the firm compliant with federal and state labor rules.
Information technology maintains the networks, software, and hardware attorneys use every day. The bigger job is cybersecurity. Lawyers have an ethical duty to make reasonable efforts to prevent unauthorized access to confidential client information, and the standard for what counts as reasonable keeps rising.7American Bar Association. Model Rules of Professional Conduct Rule 1.6 – Confidentiality of Information Comment Whether a firm’s safeguards are adequate depends on the sensitivity of the information, the likelihood of a breach without additional protection, and the cost of implementing the protection. A breach can expose litigation strategy, trade secrets, and financial details for hundreds of clients at once, so IT teams layer in encryption, multi-factor authentication, and access controls that go well beyond a typical office. Many firms now carry cyber liability insurance, which requires meeting baseline security standards to qualify for coverage.8ABA Insurance Program. Cyber Liability Insurance
Facilities staff handle office leases, maintenance, vendor relationships, physical security, and equipment. In firms with multiple offices, they coordinate space planning and control physical access to sensitive areas like file rooms, server rooms, and partner offices.
Information and Knowledge Management
Legal work generates enormous volumes of documents, and managing that information is a specialized function in its own right.
Research and Library Services
Research librarians maintain subscriptions to legal databases and help attorneys locate statutes, case law, regulations, and secondary sources. In complex litigation, they compile legislative histories or track regulatory developments across multiple jurisdictions. A librarian’s research hour costs the firm far less than a partner’s billable hour, which saves client money.
E-Discovery and Litigation Technology
Modern lawsuits routinely involve millions of electronic documents. E-discovery teams collect, process, and review that data using specialized software that flags relevant documents, identifies privileged communications, and prepares productions that comply with court rules. These teams increasingly use predictive coding and AI-driven analytics to sort through data sets faster than human reviewers could manage. What was once a niche service is now a core department at litigation-heavy firms.
Records Retention and Destruction
Every client file has a lifecycle: active use, archival storage, and eventual destruction. Retention schedules dictate how long each type of file must be preserved after a matter closes, and the timelines vary by practice area, applicable statutes of limitation, and professional conduct requirements. Trust account records typically must be preserved for at least five years after representation ends.2American Bar Association. Model Rules of Professional Conduct Rule 1.15 – Safekeeping Property When files are cleared for destruction, they have to be disposed of in a way that preserves confidentiality, whether that means shredding paper or securely wiping digital media.
Marketing and Business Development
Marketing teams manage the firm’s website, social media, and public relations. They draft press releases on significant wins, coordinate attorney submissions to ranking publications, and produce thought leadership content. Business development professionals work the relationship side: identifying potential corporate clients, tracking industry trends that create new legal needs, and maintaining client relationship management systems. These staff do not practice law.
Everything a marketing department produces has to comply with the professional conduct rules that govern attorney communications. A firm cannot make false or misleading claims about its services, and even technically true statements can violate the rules if they omit facts that would change a reasonable person’s understanding.9American Bar Association. Model Rules of Professional Conduct Rule 7.1 – Communications Concerning a Lawyers Services Lawyers cannot pay for referrals, with narrow exceptions for legal service plans and qualified lawyer referral services. Every advertisement must identify at least one lawyer or firm responsible for its content, and a lawyer cannot claim to be a certified specialist unless the certifying organization has been approved by the appropriate state authority or accredited by the ABA.10American Bar Association. Model Rules of Professional Conduct Rule 7.2 – Communications Concerning a Lawyers Services Specific Rules Experienced legal marketers know these rules as well as many of the attorneys do.
Recruiting and Professional Development
Hiring and keeping good lawyers is expensive, and firms that do it poorly bleed talent and institutional knowledge. The primary recruiting pipeline at large firms runs through summer associate programs, where law students between their second and third years spend the summer working on real client matters alongside firm attorneys. Firms extend full-time offers to the summer associates they want to keep.
Once attorneys join the firm, mentorship programs pair junior lawyers with experienced partners who help them navigate firm culture, build networks, and develop their substantive skills. Firms fund continuing legal education to keep attorneys current on their practice areas. The ABA also encourages every lawyer to contribute at least 50 hours per year to pro bono work serving people who cannot afford legal representation, and many firms build that expectation into their professional development framework.11American Bar Association. Model Rules of Professional Conduct Rule 6.1 – Voluntary Pro Bono Publico Service