Accrual Acquires Puzzle: The CAS Platform Three-Way Fight Small CPA Firms Need to Understand

Accrual Acquires Puzzle: The CAS Platform Three-Way Fight Is Here

On September 2, 2026, Accrual — the AI-native accounting platform that launched in February with $75M from General Catalyst — acquired Puzzle, an AI-native general ledger and close automation platform. Sasha Orloff, Puzzle's founder, joined Accrual as part of the deal.

That acquisition created something the accounting software market did not have before September 2: a single platform covering both tax preparation and client accounting services, built from scratch on AI — not retrofitted. Customers include Armanino, Aprio, and H&R Block.

At the same time, the December 31 QBOA sunset is forcing every firm still on QuickBooks Online for Accountants to make a platform decision before year-end. And Karbon has quietly been deploying its Kai AI layer to firms already using Karbon for practice management.

The result: three different CAS platforms with three different philosophies, all competing for the same small CPA firm owner making the same year-end technology decision. Here is the breakdown.

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What Accrual's Puzzle Acquisition Actually Means

Before the acquisition, Accrual's positioning was straightforward: an AI-native alternative to tax preparation software. It automated tax prep workflows — not accounting workflow, not month-end close, not general ledger.

Puzzle filled the other half of the stack. Tyler Otto at Specialized Accounting (a 15-person firm) reported a 50% reduction in monthly close time using the Ramp Stack — the workflow that Puzzle's technology powered — before it was folded into Accrual. That is the kind of concrete efficiency data small CAS practices need to make a platform decision.

Post-acquisition, Accrual is the first all-in-one AI-native platform that covers both tax AND accounting services in a single, purpose-built-for-AI stack. The keyword is purpose-built. Karbon Kai and Intuit Accountant Suite are AI layered on top of existing platforms. Accrual+Puzzle is AI from the foundation.

The gap: CAS on the new Accrual+Puzzle platform is not generally available until end of 2026 at earliest. If you need to move before December 31, Accrual is not your answer yet.

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The Three Platforms: What Each Is Built For

Platform	Best For	AI Approach	Price Range	GA Status
Karbon + Kai	Firms already on Karbon for practice management	AI layered on existing client history, email, and workflow data	$59/user/month	Available now
Intuit Accountant Suite	Firms migrating from QBOA before Dec 31 deadline	AI-surfaced anomalies and Firm Playbooks inside QuickBooks infrastructure	QuickBooks pricing + add-ons	Available now
Accrual + Puzzle	Firms launching or expanding CAS, willing to rebuild	AI-native from the ground up — tax + general ledger + close automation	Contact sales	CAS GA: end of 2026

Karbon + Kai

If your firm already runs on Karbon, Kai is the fastest AI upgrade available. Kai knows your firm's client history, email thread context, and workflow state — it is not a generic AI assistant, it uses your data. Karbon reports 18 hours recovered per employee per month. The tradeoff: Kai is AI on top of practice management software. It does not replace your accounting stack — it makes your practice management faster. If you are looking for a full CAS accounting platform, Karbon+Kai is not that.

Intuit Accountant Suite

For QuickBooks shops, this is the path of least resistance. Intuit Accountant Suite is the migration destination Intuit built for firms leaving QBOA. AI features include Cross-Client Portfolio Insights (anomaly detection across all clients at once) and Firm Playbooks for standardizing recurring work. Because it is built on QuickBooks infrastructure, your staff already knows how to use it and your client data migrates cleanly. The tradeoff: it is AI built on a legacy accounting architecture. It does what QBOA did, with better AI surfacing — not a rethink of how accounting software works.

Accrual + Puzzle

The most AI-native option. Tyler Otto's 50% monthly close reduction is the most compelling concrete data point in the CAS platform market right now. The platform is built from scratch for AI — not retrofitted. The tradeoffs: CAS is not generally available until end of 2026, pricing is not public, and the customer list (Armanino, Aprio, H&R Block) skews larger. If you are a 5-15 person firm looking to build a CAS service line, evaluate Accrual as a Q1 2027 option — not a 2026 migration.

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Decision Matrix: Which Platform Fits Your Firm

You're already on Karbon → Karbon Kai. Enable Kai now. No migration, no disruption, no new vendor relationship. Your client data is already there. The 18 hours/employee/month figure alone justifies the cost of whatever your Karbon subscription is.

Most of your clients are on QuickBooks, and you need to migrate off QBOA before December 31 → Intuit Accountant Suite. This is the lowest-disruption path. You are migrating anyway — the only question is where. Intuit Accountant Suite keeps your clients on QuickBooks-compatible infrastructure, your staff on familiar screens, and your workflow logic intact. Get beta access now and begin client data migration in October.

You are launching or expanding CAS and willing to build on new infrastructure → Evaluate Accrual + Puzzle, but plan for Q1 2027. Do not wait for Accrual if you need to move before December 31. Request beta access now to get into the pipeline, but build your 2026 Q4 plan assuming Accrual is not operationally available until Q1 2027. Use the Q4 window to standardize your current CAS process documentation — that work is necessary regardless of which platform you land on.

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The QBOA Migration Window: Why Q4 2026 Is the Decision Point

QuickBooks Online for Accountants sunsets December 31, 2026. That is not a soft deadline — it is a hard stop on a platform that may currently manage all of your client accounting workflows.

The migration window matters because Q4 is the last viable period to move before year-end data gets complicated. Migrating in January means doing it in the middle of your busiest tax season. Q4 is tight, but it is the right window.

What choosing Intuit Accountant Suite means in practice: your clients stay on QuickBooks. You move your firm-side workflow from QBOA to Intuit Accountant Suite. Client-facing data stays largely in place.

What choosing Karbon means for accounting workflow: Karbon handles practice management (client communication, workflow, task management, billing). Your actual accounting software is a separate decision — Karbon does not replace your general ledger. Karbon Kai makes your Karbon practice management faster; it does not replace the QBOA accounting function.

What Accrual's CAS timeline means for your Q4 decision: If Accrual CAS goes GA in November or December, the migration window to complete a meaningful onboarding before year-end is extremely narrow. Do not count on it. The prudent approach is to migrate to Intuit Accountant Suite or Karbon now, and evaluate Accrual as an upgrade path in Q1 2027 — once you have seen what CAS actually delivers on their platform.

The three paths are not permanent. Moving to Intuit Accountant Suite in Q4 2026 does not lock you out of Accrual in 2027. Moving to Karbon now does not prevent you from adding a different accounting back-end later. Make the right decision for the next 12 months — the landscape will keep moving after that.

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One action this week: Identify which of the three scenarios above fits your firm. If you are on QBOA, start the Intuit Accountant Suite migration before October. If you are already on Karbon, enable Kai. If you are building CAS, request Accrual beta access now — even if you will not move until Q1 2027, being in their pipeline matters.

The platform decision you make before December 31 shapes your firm's capacity and margin for all of 2027. Make it deliberately.

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For more on the Accrual platform and what it means for accounting firm tax prep workflows, see our earlier Accrual coverage. For the full QBOA migration guide, see QBOA Sunset: Your Migration Options. For the complete CAS workflow picture, see CAS AI Workflow: What Accounting Firms Are Actually Building. Before committing to a new platform, assess your firm's overall AI readiness with the AI Readiness Checklist for Accounting Firms.