Best AI Receptionists for CPA & Accounting Firms (2026)

TL;DR

• Our top pick for most CPA and accounting firms is OnceHub, because it books consultations during the call, keeps the conversation to booking or taking a message so it can't read return details back to callers, and is priced per seat rather than per call or minute.
• OnceHub does not transfer live calls. Urgent callers can leave a message, which arrives as a transcript and summary, or book a partner's reserved slot. If live transfer is essential, AgentZap, Smith.ai, AIRA and Abby all offer it.
• AgentZap has the widest list of accounting practice management integrations here, including TaxDome, Canopy, Karbon and CCH Axcess.
• Smith.ai suits firms that want AI on routine calls with live human agents behind it, and offers a free AI tier for 25 calls a month.
• AIRA is the cheapest per-call plan, from $24.95 a month for 30 calls.
• Ruby and Abby are the human-led alternatives, for firms that want a person on more of their calls.
• For a tax firm, the pricing model matters more than the headline price. Per-call, per-minute and minute-bundle pricing all rise with call volume; per-seat pricing rises only if you add staff who take bookings.

An AI receptionist for a CPA firm answers the firm's phone, works out what the caller needs, and books them onto the right preparer's calendar or takes a message.

Updated October 2026: the extended filing deadline for most individual returns was October 15, 2026. The next federal deadline is January 15, 2027, when fourth-quarter estimated payments are due.

Every federal deadline brings a surge in calls, and each one lands when your preparers have the least time to answer.

Choosing an AI receptionist or accounting answering service is different from choosing one for a plumber or a dentist. Your call volume swings hard with the tax calendar. Your clients' information is protected by federal law. And the calls that matter most, new client consultations, arrive exactly when your team is busiest.

This guide compares six options against criteria built for CPA and tax firms, and shows with worked numbers why the way a vendor charges can matter more than what it charges.

A note on scope: this guide compares vendors. For how AI intake works in a tax firm, including IRC Section 7216 and the data you should never collect, see our guide to automating client intake for CPA and tax firms. For AI call answering across financial services more broadly, see our guide for finance professionals.

How did we compare AI receptionists for CPA firms?

We compared each tool against seven criteria that matter specifically to accounting firms, using each vendor's own published documentation and pricing. Competitors were assessed from their documentation, not from test accounts or live calls, so this is a comparison of published capability rather than measured performance.

The seven criteria:

1. Does it book during the call? Or does it take a message for someone to return later?
2. What does it ask, record and keep? Every tool here records calls, so the real questions are what it asks, whether recording can be switched off, and how recordings are deleted.
3. How does it hand off to practice management? Native integration, an automation tool, or a forwarded email.
4. How does the price behave in a peak? Tax firms have several peaks a year, not a steady volume.
5. Can it get urgent calls to a person? By live transfer, or by a message and a fast callback.
6. What is its security posture? Such as a SOC 2 Type 2 report, and where the AI runs.
7. Can you change plans month to month? Seasonal businesses benefit from flexibility.

The best AI receptionists and accounting answering services at a glance

Capabilities

Pricing

"Not published" means the vendor does not publish that detail, not that it lacks the capability. Prices change often; confirm current terms on each vendor's pricing page.

The best AI receptionists for CPA and accounting firms

1. OnceHub

OnceHub is an AI automation platform with scheduling built in. Its Phone Agents answer on a dedicated number and book consultations directly onto the right preparer's calendar during the call. It is our top pick for firms whose most valuable calls are new client consultations and appointment bookings.

What it does well for accounting firms:

• It books against real availability. Phone Agents use the availability and settings already configured on your Booking Calendars, so the caller hangs up with a confirmed appointment rather than a callback promise.
• You decide which questions it asks. That keeps intake at scheduling details, such as service and entity type. Calls are always recorded, so set the greeting to ask callers not to share Social Security numbers or tax figures, and delete any call where they do.
• One number can cover every service. A dedicated number attached to a Booking Hub can offer multiple conversation flows, so a single line can serve individual returns, business returns, extensions and notice responses.
• The price does not rise with call volume. Plans are priced per seat, and the pricing page lists no per-call or per-minute fees. Additional phone numbers are $4 a month, and any user who receives meetings needs a paid seat.

Why it suits a Section 7216-conscious setup:

• The conversation is limited by design. OnceHub's Phone Agent can only book a meeting or take a message, so it has no path to read return information back to a caller.
• The AI runs on private infrastructure. OnceHub documents Azure hosting with a private OpenAI instance.
• Call data is not used for training. OnceHub states that customer and caller data are never used for AI training.
• Nothing runs until you switch it on. The Account Owner must explicitly enable Phone Booking and accept its terms.
• Security is attested. OnceHub holds a SOC 2 Type 2 report.

Where it falls short:

• No live call transfer. Urgent callers leave a message, delivered as a transcript and summary, or book a reserved slot.
• No general question answering. The agent books or takes a message; it does not answer questions about services, fees or deadlines.
• Recording cannot be switched off. Every call is recorded, transcribed and summarized; deleting the call's activity permanently removes all three.
• No native practice management integration. TaxDome, Canopy, Karbon and CCH Axcess connect through APIs, webhooks, or automation platforms such as Zapier, Make and n8n. Native CRM integrations are Salesforce and HubSpot.

The usual mitigation for urgent calls is a dedicated IRS-notice calendar with reserved same-week slots, so notice callers never wait weeks for a booking. Our intake guide shows how to set it up.

Pricing: Phone Agents are on the Schedule plan at $10 per seat per month billed yearly, or $12 monthly, with one phone number included. Screening callers with Routing Forms on the phone is on the Route plan at $19 per seat per month billed yearly. Every signup starts with a 14-day free trial of the Engage plan, with no credit card needed.

Best for: Firms whose phone problem is mostly booking, such as new-client consultations, return reviews and extension help, that want flat costs and a conservative Section 7216 setup.

2. AgentZap

AgentZap is an AI voice receptionist built for accountants, CPAs and bookkeepers, with the broadest published list of accounting software integrations in this comparison.

What it does well for accounting firms:

• Accounting-specific integrations. AgentZap's accounting page lists integrations with QuickBooks, Xero, Sage, FreshBooks, Karbon, CCH Axcess and Thomson Reuters, plus Canopy and TaxDome.
• Transfers when a call needs a person. AgentZap can warm-transfer callers to your team, and its 24/7 human live-agent backup is available as an add-on at $2.50 per transferred call, according to its pricing page.
• Fast, done-for-you setup. Its accounting page describes going live in 48 hours, with the setup fee covering AI training and call-flow configuration.
• 24/7 coverage with recording. Every plan includes round-the-clock answering, call recording and transcripts, with PII masking described on its features page.
• Separate flows for new and existing clients. It describes routing existing clients to their assigned accountant and qualifying new leads separately.

Pricing: From $109 a month for 150 minutes, $295 for 450 minutes and $899 for 1,500 minutes, with overage from $0.85 down to $0.70 a minute. Each plan adds a $499 one-time setup fee, waived on a six-month Professional term. That fee matters for firms that switch tools between seasons. Annual billing gives two months free, and there is a 30-day money-back guarantee. AgentZap also notes that some practice management integrations need additional setup not covered by the setup fee, so confirm the cost of your TaxDome, Canopy or Karbon connection.

Best for: Firms whose deciding factor is native sync with their practice management or accounting software, or that need live transfer.

3. Smith.ai

Smith.ai is a hybrid service in which AI answers and qualifies calls, then hands callers who need it to live agents. It suits firms that want automation on routine calls and a person available for the sensitive ones.

What it does well for accounting firms:

• A human behind the AI. Smith.ai's AI Receptionist includes warm transfers to your team on every plan, including Free. Its own live agents are available as a per-call add-on, with no fee when the AI itself escalates.
• Native integrations. Smith.ai connects natively to Salesforce, HubSpot, Clio Grow and Clio Manage, plus 5,000+ apps through Zapier and Make.
• A genuine free entry point. Its AI Receptionist has a free plan with 25 calls a month.
• Recording and transcripts on every plan. Calls are recorded, transcribed and summarized.
• No long-term commitment. Smith.ai states that it is month-to-month with no annual contract.
• Per-call billing. Smith.ai bills per call rather than per minute, which is fairer to long intake conversations.

What to weigh: per-call pricing still rises with volume, so your busiest month is your most expensive. Model your peak month, not your average one.

Pricing: According to Smith.ai's pricing page, AI Receptionist Free covers 25 calls a month, with $3 per call after that. Pro is $150 a month for 75 calls, $270 for 150 or $500 for 300, and Enterprise is $500 for 300 calls or $800 for 500. Extra calls on paid plans cost $2.10 to $2.50. Human virtual receptionists start at $300 a month. Plans are month-to-month with no setup fees, and cancelling needs 30 days' notice.

Best for: Firms that want AI efficiency with trained human agents available for nuanced or anxious callers.

4. AIRA

AIRA is a low-cost AI receptionist that charges per call, making it the cheapest per-call plan in this comparison.

What it does well for accounting firms:

• Low starting price. AIRA's plans start at $24.95 a month for 30 calls.
• Every feature on every plan. AIRA states that call transfers, appointment booking, HubSpot, Pipedrive and Zapier integrations, recordings and transcriptions are included from the entry plan.
• Per-call pricing that is easy to predict at low volume. Every call costs the same regardless of length.

What to weigh: at 30 calls a month, the entry plan will not cover a tax firm's peak. Price the plan you would need in March, and the overage beyond it, which AIRA lists at $1.50 a call on Starter. AIRA does not publish an accounting-specific integration list, and transfers go to your own team rather than to backup receptionists.

Pricing: From $24.95 a month for 30 calls; Enterprise pricing on request. AIRA's own pages list its higher tiers in two different ways: some show Premium at $59.95 for 90 calls and Pro at $159.95 for 300, others Growth at $49.95 for 100 and Business at $159.95 for 500. Confirm current tiers with AIRA before you budget.

Best for: Solo practitioners and small firms with modest call volume who want live transfer and a low monthly bill.

The human-led alternatives

These two lead with human receptionists. Both now offer AI, but you are mainly paying for people.

5. Ruby

Ruby is a long-established US virtual receptionist service with live human receptionists, billed by the receptionist minute. It is the choice for firms that want a warm human voice on every call.

What it does well for accounting firms:

• People on the phone. Callers reach live, US-based receptionists.
• Month-to-month terms. Recent reviews describe its contracts as rolling every 30 days.

What to weigh: Ruby charges by the receptionist minute. For a tax firm, that combines two cost pressures: intake calls can be long, and volume spikes around deadlines.

Pricing: $250 a month for 50 receptionist minutes, $395 for 100, $720 for 200 and $1,725 for 500, with larger plans available, according to Ruby's own site and help center. Overage runs from $5.40 a minute on the 50-minute plan down to $4.00 on the 500-minute plan.

Best for: Firms where a human first impression is worth a premium and call volume is steady rather than seasonal.

6. Abby

Abby, formerly Abby Connect, assigns each client a small team of US-based receptionists and includes its AI receptionist on the same plan. The AI handles routine calls and hands complex ones to a human receptionist on the same call.

What it does well for accounting firms:

• Human and AI on one plan. Abby's plans cover human receptionists, the AI receptionist, or any mix, switchable at any time.
• AI minutes cost half. A minute with the AI receptionist uses half an Abby Minute, so routing routine calls to the AI stretches the same plan further.
• Continuity. Callers speak to a small, consistent team, which suits firms with long-standing clients.
• Low-risk start. Every plan has a 14-day free trial and no setup fee, month-to-month.

What to weigh: human minutes still scale with call length and volume, so a seasonal peak handled mostly by people costs more.

Pricing: $165 a month for 50 Abby Minutes, $329 for 100, $599 for 200 and $1,380 for 500, with Enterprise plans on request.

Best for: Firms that want a consistent human relationship with callers, with AI absorbing the routine volume.

Why does the pricing model matter more than the price for a tax firm?

Because a tax firm's call volume is seasonal, and per-call, per-minute and minute-bundle pricing all scale with it, while per-seat pricing scales only with your staff. A plan that looks cheap in July can be the most expensive option in March.

Here is how each model behaves when your busiest month brings five times your quietest month's calls:

• Per seat (OnceHub): your bill depends on how many people receive meetings, not how many calls arrive. It rises only if you add staff who take bookings.
• Per call (Smith.ai, AIRA): your bill rises with the number of calls, regardless of length.
• Minute bundles (AgentZap, Abby): you buy a block of minutes each month, so your bill rises with both the number of calls and how long they run.
• Per receptionist minute (Ruby): the same pressure as minute bundles, at human-receptionist rates.

Worked example: a four-preparer firm in July and March

Assume 100 calls in July and 500 in March, each averaging three minutes. Here is the cheapest way to cover each month using each vendor's published plans and overage rates, all on monthly billing:

A few honest notes on these numbers:

• The tools do different jobs. OnceHub's figure covers booking and messages only, with no live transfer; AgentZap, Smith.ai and AIRA include transfer, and Ruby puts a person on every call.
• Abby is not in the table because its cost depends on how calls split between human and AI minutes.
• AIRA is shown as a range because its own pages list two different tier structures for the same prices.
• Annual billing changes the picture slightly. OnceHub drops to $40 a month and AgentZap gives two months free.
• Prices were checked on each vendor's own site on October 9, 2026. Overage terms change, so confirm current rates before you budget.

The practical test: take your own call volume from last March and last July, and price each shortlisted tool at both.

Why does data control matter for an accounting firm?

Because IRC Section 7216 makes it a federal misdemeanor for a tax return preparer to disclose tax return information without consent, so what an AI receptionist asks, records and can say matters. This is the criterion most AI receptionist comparisons leave out.

Every tool in this comparison records calls. So the useful questions are:

• Can recording be switched off?
• How are recordings deleted?
• Can the AI disclose anything about a client's return?

OnceHub's answers: recording cannot be switched off; deleting the call's activity permanently removes its recording, transcript and summary; and the AI cannot disclose return details, because the conversation is limited to booking or a message.

If any vendor offers return-status lookups or reads pending document lists to callers, review that feature against your Section 7216 and AICPA obligations before you switch it on. Several vendors in this category market such features as conveniences.

We cover Section 7216, the AICPA confidentiality rule and the FTC Safeguards Rule in detail in our guide to automating client intake. This is general information, not legal or tax advice.

Which AI receptionist should a CPA firm choose?

Choose based on the problem you are actually solving, since each tool here wins on a different one.

• Choose OnceHub if your phone problem is mostly booking and you want flat costs through tax season and a conservative Section 7216 setup.
• Choose AgentZap, Smith.ai or Abby if live transfer of urgent calls is non-negotiable.
• Choose AgentZap if native integration with TaxDome, Canopy, Karbon or CCH Axcess is your deciding factor.
• Choose Smith.ai if you want AI on routine calls with live agents available for sensitive ones.
• Choose AIRA if you are a solo practitioner with low volume and want a low per-call bill with transfer included.
• Choose Ruby if a human first impression matters most and your volume is steady.
• Choose Abby if you want a small, consistent receptionist team with AI handling routine calls.

Whichever you choose, the same five checks apply before you sign:

1. Price your peak month, not your average one.
2. Confirm what it records, transcribes and retains, and how to delete it.
3. Confirm what it can say about a client's return.
4. Ask how bookings reach your practice management system.
5. Call it yourself and ask it how much you owe. If it answers, it is not configured for a tax firm.

Conclusion

The right AI receptionist for a CPA or accounting firm is the one that answers your calls through every deadline without turning each peak into a bigger invoice, and without saying anything your firm is obliged to protect.

That puts three questions ahead of feature lists: how does the price behave when your volume jumps, what does the system record and say, and how do urgent callers reach a person? A scheduling-native tool priced per seat wins the first two for a seasonal firm. On live transfer and native practice management sync, AgentZap, Smith.ai and Abby are stronger, and firms where those are decisive should shortlist them.

If you want to test the booking flow on your own line before the next deadline, start a 14-day free trial of OnceHub, attach a dedicated number to a Booking Hub, and call it yourself. You can also read more about OnceHub Phone Agents or compare plans.

Frequently asked questions

What is the best AI receptionist for a CPA firm?

Our top pick for most CPA firms is OnceHub, because it books consultations during the call, keeps the call to booking or a message, and is priced per seat, so costs stay flat through tax-season peaks. OnceHub does not transfer live calls, so firms that need it should look at AgentZap, Smith.ai or Abby; AgentZap is also stronger if native TaxDome, Canopy or Karbon integration is decisive.

What is the best answering service for accountants?

The best answering service for accountants depends on whether you want AI, people, or both. OnceHub suits firms whose calls are mostly bookings and that want flat per-seat pricing. Abby and Ruby put human receptionists on calls, with Abby including an AI receptionist on the same plan, and Smith.ai combines AI with live agents.

Can an AI receptionist transfer calls to a CPA?

Some AI receptionists can transfer calls to a CPA and some cannot. AgentZap offers warm transfer to your team and live-agent backup as an add-on, Smith.ai includes warm transfers to your team on every plan, with its own live agents as a per-call add-on, AIRA includes call transfers to your team, and Abby's AI hands complex calls to a human receptionist. OnceHub does not transfer live calls; it books the caller or takes a message delivered as a transcript and summary.

Do AI receptionists record calls?

Yes, every AI receptionist in this comparison records calls. What differs is control: OnceHub records, transcribes and summarizes every call, recording cannot be switched off, and deleting the call's activity permanently removes the recording, transcript and summary. AgentZap describes masking personal information in recordings.

How much does an AI receptionist cost for an accounting firm?

AI receptionist pricing for an accounting firm ranges from free entry plans to several hundred dollars a month. OnceHub Phone Agents start at $10 per seat per month billed yearly, AIRA at $24.95 a month for 30 calls, and AgentZap at $109 a month for 150 minutes plus a $499 setup fee. Smith.ai offers a free AI tier for 25 calls, with Pro from $150 a month.

Is per-call or per-seat pricing better for a tax firm?

Per-seat pricing is usually more predictable for a tax firm, because the cost depends on staff numbers rather than call volume, so tax-season peaks do not raise the bill. In a worked example of a four-preparer firm going from 100 calls in July to 500 in March, OnceHub stayed at $48 a month on monthly billing while per-call and per-minute plans rose by roughly three to four times or more.

Can an AI receptionist integrate with TaxDome or Canopy?

Some AI receptionists integrate natively with TaxDome and Canopy. AgentZap lists both, along with Karbon and CCH Axcess. OnceHub does not integrate with them natively; it connects through APIs, webhooks, or automation platforms such as Zapier, Make and n8n, with native integrations for Salesforce and HubSpot.

Should an accounting firm choose an AI or a human receptionist?

An accounting firm should choose AI if it wants 24/7 coverage and predictable costs through seasonal peaks, and a human service if a person on every call matters more than cost. Hybrid options such as Smith.ai and Abby combine the two, with AI handling routine calls and people taking the sensitive ones.

Is an AI receptionist compliant with Section 7216?

No AI receptionist is compliant or non-compliant with Section 7216 on its own; compliance depends on how your firm configures and uses it. Section 7216 restricts a preparer's disclosure of tax return information, so the conservative approach is to keep the AI's conversation to scheduling and confirm your setup with your own counsel.

Can I change AI receptionist plans between tax seasons?

Many AI receptionist providers allow month-to-month plans. With OnceHub you can add or remove seats at any time from the Billing page, and a removed seat stays active until the end of the period already paid for, so seasonal seats work best on monthly billing. Smith.ai and Abby are month-to-month, and switching to AgentZap carries a $499 one-time setup fee.

Sources

• OnceHub pricing and feature comparison (re-verified October 2026) — vendor-published (ours): Phone Agents on the Schedule plan at $10 per seat per month billed yearly or $12 monthly, with one phone number included; additional numbers at $4 a month; Routing Forms phone screening on the Route plan at $19 per seat per month billed yearly; 14-day Engage trial with no credit card; native CRM integrations with Salesforce and HubSpot plus APIs, webhooks, Zapier, Make and n8n; SOC 2 Type 2 report. https://www.oncehub.com/pricing
• OnceHub, Compliance and Control for Phone Booking — vendor-published (ours): conversation limited to scheduling a booking or leaving a message; Azure hosting with a private OpenAI instance; customer and caller data never used for AI training; Account Owner must enable Phone Booking; every call recorded, transcribed and summarized, with recording that cannot be turned off; deletion of the phone call activity removes all three. https://help.oncehub.com/product/booking-calendars/phone-booking/compliance-and-control-for-phone-booking/
• OnceHub, Call Recording Compliance Guidance for Phone Agent — vendor-published (ours): recording-consent guidance and the welcome message. https://help.oncehub.com/product/booking-calendars/phone-booking/call-recording-compliance-guidance-for-phone-agent/
• OnceHub, Managing Your Subscription — vendor-published (ours): seats and phone number licenses can be added or removed at any time. https://help.oncehub.com/help/managing-your-subscription
• AgentZap, Pricing — vendor-published: plans at $109 for 150 minutes, $295 for 450 and $899 for 1,500, with overage from $0.85 to $0.70 a minute; $499 one-time training and setup fee, waived on a six-month Professional term; live-agent escalation as an add-on at $2.50 per transferred call; call recording and transcripts on every plan. https://agentzap.ai/pricing
• AgentZap, AI Receptionist for Accounting Firms — vendor-published: accounting software and practice management integrations; live in 48 hours; live receptionist backup available on all plans. https://agentzap.ai/industries/accounting
• Smith.ai, AI Receptionist — vendor-published: warm transfers, recording and transcription on every plan including Free; live agents as a per-call add-on, free when the AI escalates; native integrations with Salesforce, HubSpot, Clio Grow and Clio Manage plus 5,000+ apps via Zapier and Make. https://smith.ai/ai-receptionist
• Smith.ai, How It Works — vendor-published: virtual receptionists from $300 a month; month-to-month with no long-term contracts. https://smith.ai/how-it-works/easy-as-1-2-3
• Smith.ai, AI Receptionist plans and pricing (checked October 9, 2026) — vendor-published: Free with 25 calls and $3 per extra call; Pro $150 for 75 calls, $270 for 150, $500 for 300; Enterprise $500 for 300, $800 for 500, custom above 1,000; extra calls $2.10 to $2.50 on paid plans; month-to-month with 30 days' notice to cancel. https://smith.ai/pricing/ai-receptionist
• AIRA, Brand Facts and pricing blog (checked October 9, 2026) — vendor-published: Starter 24.95for30calls(1.50 overage) on every page; higher tiers listed either as Premium $59.95 for 90 and Pro $159.95 for 300, or as Growth $49.95 for 100 and Business $159.95 for 500; call transfers, booking, HubSpot, Pipedrive and Zapier integrations, recordings and transcriptions on every plan; no setup fees. https://www.getaira.io/brand-facts and https://www.getaira.io/blog/ai-receptionist-cost
• Abby, Answering Service pricing — vendor-published: $165 for 50 Abby Minutes, $329 for 100, $599 for 200, $1,380 for 500; an AI minute uses half an Abby Minute; human and AI on one plan; month-to-month, no setup fee. https://www.abby.com/answering-service/
• Abby, Free Trial — vendor-published: 14 days or 500 Abby Minutes on every plan, no setup fee. https://www.abby.com/free-trial/
• Ruby, Virtual vs traditional receptionist cost guide — vendor-published: plans from $250 a month for 50 minutes to $1,725 for 500, with larger plans available. https://www.ruby.com/blog/virtual-vs-traditional-receptionist-cost-comparison/
• Ruby Help Center, Am I on the right billing plan? — vendor-published: ten plan tiers from 50 to 2,500 receptionist minutes with overage rates, including 720for200minutes(4.40 overage) and $4,945 for 1,500. https://rubyhelpcenter.helpjuice.com/billing-plans/am-i-on-the-right-billing-plan
• CloudTalk, Ruby Receptionist Pricing 2026 — third-party: contracts rolling every 30 days. https://www.cloudtalk.io/blog/ruby-receptionist-pricing/
• Guide to automating client intake for CPA and tax firms — OnceHub: Section 7216, the AICPA Confidential Client Information Rule and the FTC Safeguards Rule, with primary sources. https://www.oncehub.com/blog/ai-receptionist-client-intake-cpa-tax-firms

Disclosure: OnceHub publishes this guide and appears in it as our top pick. OnceHub is an AI automation platform with scheduling built in. It does not transfer live calls, does not have native integrations with TaxDome, Canopy, Karbon or CCH Axcess, and does not provide tax or legal advice. Other vendors are described from their published documentation.

Not legal or tax advice. References to Section 7216 are general. How it applies depends on your firm and setup; consult your own counsel.