How to Start a Tax Attorney Practice

A tax attorney practice is one of the highest-margin solo legal practices you can build. Tax work is technical enough to keep commodity legal-form competitors out, clients are typically businesses or high-net-worth individuals with predictable budgets, and the scope of work (controversy, transactional planning, estate-and-gift planning, tax court litigation, IRS audit defense) segments into repeatable engagement types with clear pricing. Solo tax attorneys in Years 3-5 routinely bill $350K-$800K/year with 60-75% net margins. The trade-off is that the entry bar is high: law degree, bar admission, ideally an LLM in taxation, and either years of firm experience or a very specific niche you built during law school.

This guide is for a newly-admitted attorney or a lateral attorney who wants to launch a solo tax practice focused on some combination of: IRS controversy and audit defense, business tax planning for owner-operated small businesses and closely-held entities, international tax (cross-border, FBAR, GILTI, expatriation), estate and gift tax planning, or tax court litigation. It is not a guide to becoming a CPA or EA — that is a different credentialing path with different economics.

Realistic revenue ranges: A solo tax attorney in Year 1 typically gross-bills $90K-$180K, with net income of $40K-$100K after rent, insurance, bar dues, CLE, research subscriptions, and software. Year 2 is usually $150K-$300K gross, $80K-$200K net, as word-of-mouth and referral relationships mature. Year 3-5 attorneys who specialize (IRS controversy, international tax, or high-net-worth planning) regularly bill $350K-$800K gross. Flat-fee work (offer-in-compromise engagements, foreign bank account compliance packages, S-corp election planning, estate plans) tends to scale better than hourly controversy work because you can run 15-40 engagements simultaneously instead of being rate-capped. The honest reality: Year 1 is lean unless you brought a book of business from a prior firm or you have a strong referral network from law school, a CPA relationship, or prior industry experience. Plan on 6-12 months of lower-than-expected billings while the referral engine builds.

Practicing tax law as an attorney requires, at minimum, a JD from an ABA-accredited law school and admission to the bar of at least one state where you will practice. Beyond that, the credentials that actually matter for a tax-focused practice are: an LLM in Taxation (highly recommended, and considered table stakes by most firms hiring tax associates — but not strictly required to hang a shingle), admission to the United States Tax Court (required to litigate in Tax Court, a separate admission process from any state bar), federal court admission in your district (required for federal cases), and Circular 230 compliance for anyone practicing before the IRS.

An LLM in Taxation is the single most impactful credential for a solo tax practice. Top programs include NYU, Georgetown, Florida, University of San Diego, Loyola Los Angeles, Boston University, Villanova, and Northwestern. Full-time programs run 1 year and cost $55K-$90K in tuition; part-time programs run 2-4 years evenings and cost $30K-$70K. An LLM is essentially a requirement for serious international tax work, estate planning practice, or competing with firm-trained lawyers. For IRS controversy and small-business tax work, an LLM is helpful but not strictly necessary — many successful solo controversy attorneys built practices with just a JD plus years of IRS examination experience.

United States Tax Court admission requires passing the Tax Court bar exam (a non-attorney exam also permits some practice, but attorneys get admitted without examination once they have state bar admission and file an application). Admission fee is roughly $50 and the application is straightforward for licensed attorneys. Get admitted in Year 1 even if you do not have a Tax Court case yet — it is a marketing credential and a requirement the moment a case appears.

IRS practitioner requirements under Circular 230: any attorney in good standing is automatically qualified to practice before the IRS, but you must obtain a PTIN (Preparer Tax Identification Number) if you prepare returns for compensation, complete Form 2848 (Power of Attorney) for each client engagement requiring IRS representation, and comply with ongoing Circular 230 ethics standards. If you want to sign returns as a preparer, you also need an EFIN (Electronic Filing Identification Number) from the IRS. PTIN is $19.75/year; EFIN is free but takes 45 days to process. Most tax attorneys do not prepare returns — they partner with a CPA who does — and so only the PTIN is needed for the few engagements that involve return signing.

Specific niche credentials worth considering: for international tax, an MST or LLM in International Tax and foreign-jurisdiction bar admissions; for estate planning, a Certified Specialist in Estate Planning, Trust and Probate Law designation (available in California and a few other states); for controversy, prior IRS experience (revenue officer, revenue agent, or Office of Chief Counsel experience is gold for the controversy niche).

A law firm is not a regular LLC. Attorneys form professional limited liability companies (PLLC) or professional corporations (PC) — the specific structure depends on state rules. A few states (California, Nevada, others) require professional corporations for attorneys rather than PLLCs. Most states allow PLLCs for attorneys. Your state bar's law firm registration rules govern the permitted entity types. Below are the setup pieces that are specifically different for a law firm versus a regular service business.

Tax attorneys typically bill in three modes: hourly, flat fee per engagement, and monthly retainer (general counsel / fractional tax counsel). Each fits a different service type, and a healthy solo practice uses all three.

Hourly billing in tax law as of 2026: a solo tax attorney in a mid-size metro typically bills $275-$450/hour. Major metros (NY, SF, LA, DC, Chicago, Miami): $375-$650/hour. Very experienced IRS controversy or international tax specialists: $500-$850/hour. Hourly works well for IRS audit defense, litigation, and ambiguous-scope matters. Track time meticulously — bar rules require detailed timekeeping and honest billing.

Flat-fee engagements are the margin machine of a modern tax practice because they decouple revenue from hours. Typical flat fees in 2026: offer-in-compromise package $3,500-$8,500, installment agreement negotiation $1,500-$3,500, penalty abatement $1,200-$3,000, foreign bank account compliance (streamlined filing, voluntary disclosure) $5,000-$15,000, S-corp election and setup $1,500-$3,500, basic estate plan (will, POA, healthcare directive, single-person trust) $2,500-$5,000, complex estate plan (married couple, AB trust, ILIT, business entity integration) $5,500-$15,000, business formation with tax planning $2,500-$6,500, Section 1031 exchange guidance $2,500-$5,000, IRS audit representation (flat fee option) $5,000-$15,000 depending on complexity.

Monthly retainers / fractional tax counsel: $2,500-$8,500/month for ongoing advisory relationships with businesses that need regular tax planning access. Retainers create recurring revenue and are the single most valuable pricing innovation for a solo practice — 3-5 retainer clients smooth the entire cash flow of the firm.

Build a written service menu with flat-fee pricing for your most common engagement types. A client who sees a clear "offer in compromise: $5,500 flat" on your website is 3-5x more likely to call than a client who sees "call for consultation."

Tax attorneys do not market like consumer service businesses. You cannot run Instagram reels of before-and-afters. Client acquisition in tax law is almost entirely driven by four channels: CPA and accountant referrals, attorney referrals from other specialties (estate planners, business attorneys, family law attorneys), content-led authority (blog, LinkedIn, YouTube explaining complex tax concepts), and local SEO / Google Business Profile for specific high-intent searches ("tax attorney near me" and long-tail like "offer in compromise attorney [city]").

CPA referrals are the single highest-leverage channel. A productive relationship with 5-10 local CPAs can produce the majority of a solo tax practice's work in Years 1-3. The relationship is bidirectional: you refer tax prep and bookkeeping work to them, they refer controversy, complex planning, and legal-opinion work to you. Build this network intentionally — coffee meetings, CLE presentations, co-authored content, and a reliable turnaround on small questions (answer a CPA's email in 24 hours, not 5 days).

Content-led authority is the second-highest-leverage channel and the one most solo tax attorneys neglect. LinkedIn posts explaining recent tax court decisions, IRS guidance, and common audit triggers compound into a recognizable professional brand over 12-24 months. A blog hosted on your firm website with 30-50 long-form posts (1,500-3,000 words each) on specific tax topics ranks on Google for long-tail searches and converts organic traffic to consultations. A YouTube channel with 50+ explainer videos on tax topics attracts high-net-worth and business clients who watch your content for months before they call.

Paid advertising in tax law: Google Search ads for high-intent keywords ("IRS audit attorney," "offer in compromise lawyer," "tax court attorney") work, but CPC is expensive ($15-$75 per click in competitive metros) and conversion rates from click to consultation run 3-8%. Expect cost per booked consultation of $200-$700 in most markets, and cost per actual paying matter of $800-$3,500. Paid ads make sense once your flat-fee unit economics are proven and you have capacity to handle the inbound volume.

Local Google Business Profile optimization is free and high-ROI. Complete the profile fully, request reviews from every client (tax attorney clients will leave reviews when asked, especially after positive controversy outcomes), and answer Google's Q&A section actively.

A tax law practice has a specific and demanding operational stack with several non-negotiable pieces that most general-purpose business software cannot handle. You need: a conflict-check system that covers every prospective client before you sign an engagement letter, engagement letter templates with state-specific bar-compliant language and ESign, IOLTA trust accounting that keeps firm funds and client funds strictly separate and supports three-way reconciliation, matter-based billing that tracks time (hourly matters) and flat-fee payment schedules, document management with secure client portal access and version control, deadline calendaring for statutes of limitations and IRS deadlines (missed deadlines are the #1 source of malpractice claims in tax practice), and encrypted communication with clients for SSN and financial data.

Most solo tax attorneys assemble a stack from: a legal-specific practice management tool (Clio, MyCase, Smokeball, or PracticePanther) for matter management and IOLTA billing, Microsoft 365 or Google Workspace for email and documents, a dedicated e-signature tool (DocuSign or Adobe Sign), a separate CRM for prospective client tracking (usually spreadsheets in Year 1-2), and QuickBooks for firm accounting. That stack typically runs $200-$500/month and has at least three points where data does not flow cleanly.

The unified stack approach adds a single ops platform for CRM, intake automation, client portal, ESign, marketing automation, and matter-adjacent docs — while keeping the legal practice management tool (Clio or equivalent) for the legal-specific pieces (IOLTA, hourly timekeeping, conflict-check integration, matter-based billing). The legal practice management tool is non-negotiable because of IOLTA and bar-compliance requirements; a general ops platform cannot replace it. But the CRM, prospect tracking, intake automation, and content marketing pieces work far better in a unified ops platform than in a legal PMS bolted with three add-ons.

Deelo is not a legal practice management system — Clio, MyCase, Smokeball, and PracticePanther handle the IOLTA, hourly billing, trust accounting, and legal-specific compliance requirements that tax attorneys are legally required to use. Deelo sits alongside your legal PMS and replaces the CRM, marketing automation, intake workflow, and non-IOLTA document management pieces of the stack.

What lives in Deelo for a tax attorney: the prospect pipeline from first inquiry through consultation to engagement letter to signed matter. The intake automation — a new prospect fills out an intake form, Deelo runs a conflict check against the existing client database (or integrates with your Clio conflict-check), sends a pre-consultation questionnaire with tax-specific questions (entity type, tax years at issue, IRS correspondence received, estimated tax liability), schedules the consultation, sends a fee agreement via ESign if the matter is accepted, and collects the retainer via integrated payment (with the retainer deposit routed to your IOLTA through your PMS once received).

The marketing automation layer sends newsletter content to CPAs and attorneys in your referral network, tracks which CPAs are actively referring (referral attribution in the CRM), sends follow-up sequences to prospects who consulted but did not engage (with timing appropriate to tax calendar — April and October are high-urgency), and handles the LinkedIn and email outreach to new CPA prospects to build the referral network.

Document management for non-privileged marketing documents, CLE materials, blog drafts, and general firm documents lives in Deelo's Docs app. Client-privileged matter documents stay in the legal PMS under attorney-client privilege protection.

At $19/seat/month, a solo tax attorney pays $19 for the marketing, CRM, and intake layer of the firm, on top of their legal PMS subscription ($79-$149/month). A two-lawyer firm pays $38. This is dramatically less than stitching together a standalone CRM ($50-$200/month), marketing automation platform ($99-$300/month), and standalone intake tool ($25-$75/month) — which is the typical non-unified stack for solo firms.