Starting an Accounting Firm typically costs between $5,000 and $25,000 (SBA, 2025), depending on whether you launch a solo bookkeeping practice from a spare bedroom or a CPA tax-and-advisory firm with a small lease and a full software stack. The $5,000 version is a home-office EA or bookkeeping practice running QuickBooks Online Accountant, an E&O policy, and a website. The $25,000 version is a licensed CPA firm with professional tax software like UltraTax or Lacerte, practice management software, a small office, and a real marketing budget. The work is mostly your own labor, so the largest costs are software, licensing, and insurance rather than equipment. Billing runs hourly ($150-$400), per return ($200-$2,500), or as a monthly retainer, and the high-margin recurring model (Client Accounting Services) is what most new firms now build toward.
Quick Cost Summary
| Cost Category | Low Estimate | High Estimate | Type |
|---|---|---|---|
| Software Stack (annual) | $1,000 | $9,000 | One-Time |
| Licensing, Registration & PTIN/EFIN | $300 | $2,500 | One-Time |
| Office, Computer & Equipment | $1,200 | $6,500 | One-Time |
| E&O & Business Insurance | $500 | $2,500 | One-Time |
| Website, Branding & Marketing | $1,000 | $4,500 | One-Time |
| Total Estimated Startup Cost | $5,000 | $25,000 |
Costs are estimates based on national averages. A CPA firm with premium tax software and a lease runs past the high end; a home-based bookkeeping practice can launch near the low end.
Detailed Cost Breakdown
Software Stack (annual) - $1,000 to $9,000
Software is the engine of an accounting firm, and it stacks fast. Every firm needs a general ledger platform: QuickBooks Online Accountant is free for accountants to use, but you pay for client subscriptions or wholesale billing, and Xero runs a similar model. A tax-prep firm adds professional tax software, which is the biggest software line: Drake Tax starts around $1,800-$2,500 per year for unlimited returns, while Lacerte and UltraTax run $3,000-$10,000+ depending on per-return pricing and modules. Practice management and workflow tools like Karbon ($59/user/month) or Canopy organize client work, deadlines, and document requests. Add a secure document portal, a payroll add-on, and an e-signature tool, and a CPA tax firm easily spends $6,000-$9,000 a year on software alone. A bookkeeping-only practice that skips tax software can keep this line near $1,000-$2,000.
Licensing, Registration & PTIN/EFIN - $300 to $2,500
What you can call yourself and what you can file determines this line. Calling the firm a "CPA firm" or signing audited financials requires an active CPA license and, in most states, a separate firm registration or permit to practice ($100-$500). A non-CPA can run a bookkeeping or tax-prep firm without a license. To prepare tax returns for pay, the IRS requires a PTIN ($19.75/year, IRS 2025) for each preparer, and to e-file you need an EFIN, which is free but requires an IRS application and a suitability check that can take 45 days. Enrolled Agent status (the EA credential) costs about $267 in exam fees across three parts plus a $140 enrollment fee. Form an LLC or PLLC ($40-$520 in state filing fees) to separate personal and firm liability. CPAs also carry ongoing continuing professional education, typically 40 hours a year, which runs $300-$1,500 annually.
Office, Computer & Equipment - $1,200 to $6,500
A home office is the standard launch. A capable computer or two ($1,200-$3,000), a second monitor or two (tax and accounting work is faster across multiple screens), a scanner for client documents, a shredder, and a fireproof file cabinet cover the basics. The high end of this line is a small leased office: a single-room professional space runs $800-$2,000 a month in most markets, and clients who hand over financial records sometimes want a real address rather than a kitchen table. Many new firms run home-based for the first year or two and add space only when client meetings or a first hire force it. Either way, prioritize a strong computer and reliable backup over a fancy office in year one.
E&O & Business Insurance - $500 to $2,500
Professional liability, also called errors and omissions or accountants' E&O, is the policy that matters most. An accountant who makes a filing error or a costly recommendation can be sued for the client's losses, and E&O covers the defense and the claim. A solo firm pays roughly $500-$1,500 a year for E&O, with higher premiums for firms doing audit or attest work. General liability ($300-$600/year) covers slip-and-fall and basic business risk, and cyber liability is increasingly necessary because a firm holds Social Security numbers, bank logins, and full financial records for every client. A data breach at an accounting firm is both a legal and a reputational disaster, so cyber coverage ($300-$1,000/year) is no longer optional for most firms.
Website, Branding & Marketing - $1,000 to $4,500
Accounting clients vet a firm before they call, so a professional website with clear services, credentials, and a contact form is the baseline. A simple site runs $1,000-$2,500 to build or $200-$500 a year on a template platform. A Google Business Profile is the highest-return free marketing a local firm can do, and listings in local directories and on a CPA or bookkeeper referral network add reach. Branding (logo, business cards, a clear name) and early advertising round out the line. The most effective acquisition for a new firm is rarely paid ads: referrals from existing clients, a relationship with a few attorneys and financial advisors, and a niche reputation drive far more business than ad spend. Budget for the website and Google profile first; add paid acquisition only once you know your numbers.
Monthly Operating Costs
| Expense | Low Estimate | High Estimate |
|---|---|---|
| Software & subscriptions | $85/mo | $750/mo |
| E&O & business insurance | $70/mo | $300/mo |
| Office or home-office allocation | $0/mo | $2,000/mo |
| Continuing education & dues | $25/mo | $150/mo |
| Marketing | $50/mo | $500/mo |
| Total Monthly | $230/mo | $3,700/mo |
Firm Models and How They Change the Math
What you sell decides your license needs, your software bill, and your revenue rhythm.
Bookkeeping & Write-Up Firm
The lowest barrier to entry and the cheapest to launch. No CPA license is required, the software stack is just a general ledger platform plus a document portal, and you can start from home for under $5,000. You categorize transactions, reconcile accounts, run monthly financials, and handle write-up work for small businesses. Billing is usually a flat monthly fee ($300-$1,500 per client) or hourly ($40-$100). Margins are solid once you have a roster, and the recurring monthly fee means revenue is steadier than tax-season work. Many bookkeepers refer complex tax and audit work to CPAs and take referrals back.
Tax Preparation Firm
The classic season-driven model. You prepare individual and business returns for a per-return fee ($200-$600 for a typical 1040, $800-$2,500 for business returns). This requires a PTIN for every preparer and an EFIN to e-file, plus professional tax software (Drake, Lacerte, ProSeries, or UltraTax) that runs $1,800-$10,000 a year. The model's defining trait is concentration: most tax firms earn the majority of annual revenue in the January-to-April window, then run lean the rest of the year. A non-CPA or an EA can run a tax firm; the EA credential lets you represent clients before the IRS.
Full CPA Advisory & Client Accounting Services (CAS)
The high-value, high-margin model the profession is moving toward. A licensed CPA firm bundles bookkeeping, payroll oversight, tax planning, and ongoing financial advice into a monthly recurring retainer ($1,000-$5,000+ per client). CAS turns lumpy project work into predictable monthly revenue and the firm into a year-round advisor rather than a once-a-year filer. This model needs the full software stack (general ledger, tax software, practice management, payroll), a CPA license and firm registration, and the highest insurance. It also commands the best margins because clients pay for judgment, not just data entry.
Niche or Specialist Firm
A firm that serves one industry deeply: real estate investors, restaurants, dental practices, e-commerce sellers, or trucking owner-operators. Specializing lets you charge premium rates, market to a tight audience, and build templated workflows that make each client faster to serve. The startup cost is similar to a general firm, but client acquisition is cheaper because referrals concentrate inside the niche and your reputation compounds. A niche firm often blends CAS, tax, and advisory for one type of client rather than serving everyone.
What Most People Forget
Hidden costs that catch first-time accounting firm owners off guard.
E&O Insurance Is Not Optional ($500-$2,500/year)
A single missed deduction, a late filing, or a bad recommendation can trigger a claim for the client's full loss plus penalties and interest. Professional liability covers the defense and the settlement, and many client contracts, banks, and referral partners require proof of it. Firms that skip E&O to save a few hundred dollars expose every personal and firm asset to one mistake.
Software Costs Stack Higher Than Expected ($1,000-$9,000/year)
The general ledger platform looks cheap until you add tax software, practice management, a document portal, e-signature, payroll, and a research subscription. Each one is reasonable alone, but together they become one of the largest line items in the firm, and tax software in particular jumps when you cross per-return pricing tiers. Map the full stack before launch so the renewal invoices in December do not surprise you.
License and CE Upkeep Never Stops ($300-$1,500/year)
A CPA license requires continuing professional education (commonly 40 hours a year), firm registration renewals, and license renewals that all carry fees. PTINs renew annually and EA enrollment renews on a cycle. These are small individually but recurring forever, and lapsing a license or PTIN can stop you from filing during the busiest weeks of the year.
Tax-Season Revenue Concentration (50-60% of revenue in 3 months)
For tax-focused firms, the January-to-April window can produce the majority of annual revenue. That means cash floods in during spring and thins out by summer, while software, insurance, and rent bill evenly all year. Budget the off-season from peak earnings, and build recurring bookkeeping or CAS clients to smooth the cash cycle.
Client Churn and Acquisition Cost (10-20% annual churn)
Clients close their business, sell, switch firms, or move to software-only filing. A firm that does not consistently add new clients shrinks even while doing good work. Referrals are the cheapest acquisition, but they take time to compound, so the first year often costs more in marketing and unpaid relationship-building than later years do.
Self-Employment Taxes (15.3% of net earnings)
15.3% of net earnings for Social Security and Medicare on top of income tax (IRS, 2026). Set aside 25-30% of every dollar of profit. As an accountant you know the rule, but founders routinely underestimate quarterly estimates in a strong first season and get squeezed when the bill arrives.
How Long Does It Take?
Plan for 4 to 12 weeks.
Business Setup (1-3 weeks): Form the LLC or PLLC, register the firm with your state board if you are practicing as a CPA, secure E&O and general liability, and open a business bank account. CPA firm registration and any name approval can gate this step.
Credentials & Software (2-6 weeks): Apply for or confirm your PTIN, submit the EFIN application (allow up to 45 days for the IRS suitability check), and set up your software stack: general ledger, tax software, practice management, and a secure document portal. The EFIN wait is the longest lead time for a new tax firm, so start it first.
Marketing & First Clients (2-4 weeks): Launch the website, build a Google Business Profile, and start the referral conversations with attorneys, advisors, and existing contacts that drive most early business. Aim to be ready before tax season opens if you are tax-focused.
Growth (Months 2-12): Convert one-time tax clients into recurring bookkeeping or CAS engagements, niche down, and let referrals compound into a stable roster.
How Long Until You're Profitable?
Most accounting firm owners reach profitability within 3 to 9 months.
An accounting firm with $5,000-$25,000 in startup costs reaches profitability faster than most businesses because the cost structure is light: the firm sells your time and judgment, not inventory or equipment. A solo bookkeeper who lands ten monthly clients at $400 each grosses $48,000 a year against a software-and-insurance overhead of a few thousand dollars. The constraint is client acquisition, not capital. Firms that launch during or just before tax season can recover startup costs in a single season; bookkeeping-first firms ramp more steadily through the year. The real lever is moving clients onto recurring monthly retainers so revenue compounds instead of resetting every spring.
Typical Breakeven Timeline
| Period | Stage | Revenue vs. Costs |
|---|---|---|
| Months 1-2 | Setup, credentials & first clients | Operating at a loss |
| Months 2-5 | Building the client roster | Revenue growing |
| Months 5-9 | Recurring clients & first tax season | At or near breakeven |
| Months 9-18 | Referrals compound, add CAS | Generating profit |
Most accounting firm owners break even within 3-9 months, faster if they launch ahead of tax season.
First-Year Cash Flow Summary
| Category | Low | High |
|---|---|---|
| One-Time Startup Costs | $5,000 | $25,000 |
| 12 Months Operating Costs | $2,760 | $44,400 |
| Total First Year | $7,760 | $69,400 |
How to Start for Less
Launch Bookkeeping-First, Add Tax Later (Save $2,000-$8,000)
Skip the expensive professional tax software in year one. Start with a general ledger platform and a few monthly bookkeeping clients for recurring revenue, then add tax software once you have the client volume to justify it. This cuts the largest software line and gives you steadier cash than a season-only tax launch.
Run Home-Based Until Clients Force an Office (Save $10,000-$24,000/year)
A leased office is the single biggest avoidable cost. Most clients are happy to meet by video or email, and a secure document portal handles file exchange. Run from a home office, deduct the qualifying portion of the space, and add a lease only when in-person client meetings or a first hire force the change. Many firms operate home-based through their first one or two tax seasons and still win clients who never set foot in an office.
Use QuickBooks Online Accountant's Free Access (Save $300-$600/year)
QuickBooks Online Accountant is free for accountants, and the ProAdvisor program adds training and discounted client subscriptions you can resell. Lean on free or low-cost professional-tier tools before paying for premium platforms you will not fully use in year one.
Build Referrals Before Paid Ads (Save $1,000-$5,000)
The cheapest client acquisition in this business is a warm referral from an attorney, a financial advisor, an existing client, or a local business group. Spend your early effort on those relationships and a Google Business Profile before buying ads. A niche reputation compounds far faster than ad spend.
Niche Down to Templatize the Work (Save 10-20 hours per client per year)
Serving one industry lets you reuse checklists, workpapers, and engagement templates instead of reinventing each client. Faster delivery means higher effective hourly rates and lower software and training overhead, which is the same as saving cash.
Tools & Resources
Accounting: QuickBooks - Track income, expenses, and taxes for your accounting firm, and use QuickBooks Online Accountant to manage client books in one place.
Business Insurance: Next Insurance - Professional liability (E&O), general liability, and cyber coverage for accounting firms. A single filing error can trigger a claim, so coverage is essential.
Business Formation: LegalZoom - Form your LLC or PLLC. Separating personal and firm liability matters when you advise on other people's finances.
Payments: Square - Accept card and ACH payments, send invoices, and bill recurring monthly retainers. Free reader, no monthly fees.
Website: Squarespace - A professional site with your services, credentials, and contact form. Accounting clients vet a firm online before they call.
Payroll: Gusto - When you add staff or offer payroll to your own clients, Gusto handles payroll, tax filing, and benefits.
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Comparing Startup Costs
- Medical Billing Business - $2,000-$20,000 to start. A home-based billing service paid a percentage of provider collections.
- Bookkeeping Business - No CPA required and a lower barrier to entry ($2,000-$10,000). Many bookkeepers refer complex tax and audit work to CPA firms and take referrals back, so the two businesses feed each other.
- Consulting Business - The same low-capital, sell-your-expertise model. Many CPAs add CFO services and financial advisory as a consulting line for higher rates than compliance work.
- Insurance Agency - A similar professional-services range ($5,000-$30,000) built on licensing, recurring commissions, and local referrals. Insurance agents and accountants frequently cross-refer small-business clients.
- Law Firm - Another license-gated professional practice with E&O, a software stack, and a billable-hour or retainer model. Attorneys are one of the strongest referral sources for an accounting firm and vice versa.
- Recruiting Business - A low-capital, relationship-driven service business in a similar startup range. A useful contrast if you want professional-services economics without a license requirement.
Frequently Asked Questions
How much does it cost to start an accounting firm?
Startup costs range from $5,000 to $25,000. The low end is a home-based bookkeeping or EA practice with a general ledger platform, E&O insurance, and a website. The high end is a licensed CPA firm with professional tax software like Lacerte or UltraTax, practice management software, a small office, and a marketing budget. Software, licensing, and insurance are the largest lines, not equipment.
Do I need a CPA license to start an accounting firm?
Not for every model. You need an active CPA license to call the firm a CPA firm, sign audited financials, or perform attest work, and most states require a separate firm registration to practice. A non-CPA can run a bookkeeping firm or, with a PTIN and EFIN, a tax-preparation firm. The Enrolled Agent (EA) credential lets a non-CPA represent clients before the IRS.
How much do accounting firm owners make?
Income varies by model, pricing, and client volume. Solo operators typically earn $50,000-$120,000 a year, and owners who build recurring CAS clients or hire staff can earn $150,000-$300,000+ (Bureau of Labor Statistics, 2025). The high-margin path is monthly recurring retainers rather than once-a-year tax returns, because they smooth the cash cycle and raise effective hourly rates.
Is an accounting firm profitable?
Yes. The cost structure is light because the firm sells time and judgment, not inventory, so net margins commonly run 15-30% for an established practice and higher for advisory-heavy firms. Profitability depends on client acquisition, pricing, and moving clients onto recurring monthly fees rather than the volume of one-time returns.
What software does an accounting firm need?
At minimum a general ledger platform like QuickBooks Online Accountant or Xero. A tax firm adds professional tax software (Drake, Lacerte, ProSeries, or UltraTax), which is the biggest software cost at $1,800-$10,000 a year. Most firms also use practice management software like Karbon or Canopy, a secure document portal, e-signature, and a payroll add-on. The full stack can reach $6,000-$9,000 a year for a tax-and-advisory firm.
How long does it take to start an accounting firm?
Plan for 4-12 weeks from decision to first client. The longest lead time is the IRS EFIN application, whose suitability check can take up to 45 days, so start it first if you plan to e-file returns. Forming the entity, registering a CPA firm with the state board, securing E&O, and setting up the software stack fill the rest of the timeline.