This is The AI Ledger Weekly: what actually changed in AI accounting software this week, checked against primary sources before it reaches you. Reading time: 5 minutes.
This week at a glance
- Meridian by Pilot released a free hosted connector giving Claude, ChatGPT, Cowork and Codex read-write access to Xero, live from 22 September.
- Avalara unveiled Aviator, an agent hub fronted by an orchestrator called Avi, on 23 September, at no extra cost to existing customers during the initial rollout.
- Ramp launched Accounts Receivable on 22 September, with a free tier covering invoicing, collections and cash application.
- The AICPA and former IRS commissioner Danny Werfel convened the Council on AI Risk in Tax on 22 September.
- The PCAOB chairman said on 21 September that the transaction half of an audit can be done by machines.
- Tabby reached 5,500 small businesses on roughly USD 100,000 of annual recurring revenue, per TechCrunch on 21 September.
- mika raised EUR 6 million on 23 September to sell German small businesses an alternative to their tax adviser.
The big story: an agent can now write to your Xero ledger, with no developer involved
Until this week, pointing an AI agent at Xero meant choosing between two bad options. The ready-made route connected in a few clicks but could only print reports, with no ability to open the transactions underneath or create anything. The route that reached everything in Xero needed programmer tools and somewhere to host the software.
On 22 September, Meridian by Pilot closed that gap. Its free hosted Xero Connector lets Claude, Cowork, Codex and ChatGPT create and modify journal entries, invoices, bills, payments, purchases and transfers, as well as inspect the transaction detail behind a report. Users sign into Xero, choose an entity, and set read-only or read-write per connected company.
The framing is deliberately pedagogical. Pilot co-founder Waseem Daher said accountants will not build a useful mental model for agents by reading another essay, but by connecting one to a real system, giving it a bounded task and deciding where they trust it. Pilot calls the tool intentionally lightweight: one connector user per client company, with no shared access, review workflow or close process.
What it means for your practice. Connect it to an internal or dormant Xero entity first, leave it read-only, and test whether the agent can find one specific miscoded transaction before you let it write anything. When you do enable write access, note what Pilot has not claimed: there is no reviewer queue and no second pair of eyes, so your sign-off control has to live outside the tool. Pilot Meridian carries an editor score of 4.7 in our directory, earned by the close platform rather than by this connector, which is seven days old.
Also this week
Avalara put an orchestrator in front of its tax stack. At its CRUSH conference on 23 September the company unveiled Avalara Aviator, an agent hub where users work in plain language through an orchestrator called Avi that routes to lead agents for research, certificates and returns. Two caveats: general availability follows next month's CRUSH Europe, so nobody has run a filing season on it, and the audit-defensible record it promises is Avalara's own claim. Avalara Avi scores 4.2 with us.
Ramp moved from money out to money in. Ramp Accounts Receivable, announced 22 September, turns contracts and purchase orders into reviewable invoices, drafts collections messages from the company's own stated policy, matches incoming payments to invoices and builds revenue recognition schedules. It is limited to US single-entity businesses on QuickBooks Online or NetSuite. Drafting from a written policy is a narrower and more checkable task than free-form chasing.
The profession began building its own tax AI guardrails. On 22 September the AICPA and former IRS commissioner Danny Werfel launched the Council on AI Risk in Tax, with the National Association of Enrolled Agents and the Federation of Tax Administrators among the participants. Its remit is to refine the AI risk framework Werfel published in The Tax Adviser and build further tools. This is guidance rather than rules, but it is the yardstick practitioners will be measured against later.
The audit regulator drew a line through the middle of the job. Speaking at an Axios event on 21 September, the PCAOB chairman said an audit is part science and part art. The science, the transaction part, can be done by machines, while professional scepticism, judgment and industry understanding still need people. He expects a transition period for the profession.
A CPA built the tool aimed at his old job. TechCrunch profiled Tabby on 21 September: 5,500 small businesses signed up in 14 months, a team of seven, roughly USD 100,000 in annual recurring revenue and a USD 1 million pre-seed round in progress. It imports live bank data through Plaid and keeps a running profit and loss rather than a month-end reconciliation. Tabby scores 3.8 with us, reflecting how young it is.
Berlin's mika raised EUR 6 million to make the tax adviser optional. The seed round, announced 23 September, was led by Smedvig Ventures. mika automates bookkeeping, VAT returns and annual accounts for German GmbHs and UGs, and keeps qualified accountants reviewing the AI's output rather than selling full autonomy. It says revenue has grown more than 20% a month and passed EUR 1 million annualised in July, both company figures.
One to watch: whether governance ships as fast as the agents
At its TakeControl conference on 16 September, just outside this week, FloQast said it will soon operationalise COSO's generative AI governance framework inside its platform, wrapping agents in risk assessment, control activities and ongoing monitoring. It also hired COSO board chair Lucia Wind as SVP of risk and audit advisory. The load-bearing word is "soon": the module is announced, not generally available. Set that against this week, where an agent that can post journals is live and free today while the framework for controlling one remains a roadmap item.
The AI Ledger now tracks more than 240 tools, each with an editor score and a last-verified date. Find the right one for a specific job at ailedger.uk/finder. The next edition lands Thursday evening.