AI Tools for Finance Teams: Numbers You Must Verify
Finance AI where the audit trail matters more than the answer, with prices and the reconciliation step no tool removes.
Short answer
Finance work splits into explanation and reconciliation, and only the first is a good fit for AI. For explaining a variance or drafting a memo, ChatGPT at $20/mo Plus or Gemini at $19.99/mo AI Pro both work, and Perplexity at $20/mo Pro adds sources you can check when a figure comes from outside your own systems. If the work happens in Excel and Outlook, Microsoft Copilot is the only one of these that lives there, at $20/mo for Pro or $30/user/mo for M365 Copilot — different products at different prices. The step none of them removes is reconciliation: an AI explanation of a number is a hypothesis about the number, and it must be tied back to the ledger before it goes anywhere near a filing.
Finance adopts AI fastest where the output is language and slowest where the output is a number, and that instinct is correct. An AI tool can explain a variance, draft a memo or summarise a policy; it cannot reconcile an account, and it will write a confident explanation for a figure it has not verified. Our finance audience page covers the broader stack; this page is about where the tooling line sits.
For explanation and drafting, ChatGPT at $20/mo for Plus and Gemini at $19.99/mo for AI Pro are the two straight choices, and Gemini is the cheaper of the pair. Perplexity at $20/mo for Pro is the one to add when the question involves something outside your own systems — a rate, a filing requirement, a competitor's claim — because it returns the pages an answer came from, and an unsourced figure in a finance memo is worse than no figure. If the deliverable never leaves Excel or Outlook, Microsoft Copilot is the only option here that operates inside those applications; note that Copilot Pro at $20/mo and M365 Copilot at $30/user/mo are different products, and only the latter reaches team-level organisational data.
| Tool | Use it for | Entry price | Where it stops |
|---|---|---|---|
| ChatGPT | Explaining variances, drafting memos | Free / $20/mo Plus | Cannot read your ledger; free tier caps usage |
| Gemini | Same, and cheaper paid entry | Free / $19.99/mo AI Pro | Unavailable in some regions |
| Perplexity | Sourced answers on external rules and rates | Free / $20/mo Pro | A cited page is not proof it supports the claim |
| Microsoft Copilot | Work inside Excel, Outlook, Word | $20/mo Pro ($30/user/mo M365) | Pro and M365 Copilot are different products |
The reconciliation rule. Every model here will produce a fluent explanation of why a number moved, and some of those explanations will be wrong in ways that read as right. Treat the output as a hypothesis to test against the ledger, not as a finding. Two further practical limits: Perplexity and similar tools can cite a page that does not actually support the sentence, so open it; and the free tiers cap usage, which matters if a month-end close is when you need it most.
Where the line sits:
- Language work — memos, summaries, explanations — is fair game with human review
- Arithmetic, reconciliation and anything that reaches a filing is not, until a person has tied it back
- Record which tool produced which draft, because an audit trail that cannot name its author is not a trail
- Do not paste ledger extracts into a consumer tier; check the retention terms first
Frequently asked questions
- Can AI be trusted to calculate financial figures?
- No. These models generate plausible text, and arithmetic is not what they verify. Use them to explain or draft, and do the calculation and reconciliation in a system that keeps an audit trail.
- Should a finance team use Copilot Pro or M365 Copilot?
- They are different products at different prices — Pro is $20/mo per person, M365 Copilot is $30/user/mo and reaches organisational data in Office apps. Check which your licence includes before promising a capability.
- Is it safe to put financial data into these tools?
- Not on consumer tiers. Retention and training terms vary, so use your organisation's approved tier and avoid pasting extracts you are not allowed to share externally.
- What does a small finance team need to pay?
- About $20/mo for one chat subscription is enough to start, and $19.99/mo if you take Gemini's AI Pro instead. Add Copilot only when the output has to stay inside Excel or Outlook, and add Perplexity when external sourcing matters.
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