Our research and generation methodology
ExpensePolicy.AI generates expense policies with a large language model wrapped in a rules layer authored by finance practitioners. This page documents the process end-to-end so finance teams can evaluate the output before adopting it.
People also ask
- What is an expense policy?
- An expense policy is a written set of rules defining which work-related expenses a company will reimburse, the limits per category, the receipt and approval requirements, and the country-specific compliance addenda. It is the contract between the employee and finance.
- Who owns the expense policy?
- The CFO owns the document, with sign-off from the General Counsel for legal language and the People / HR lead for the employee-facing clauses. Local controllers own the country addenda. Sales-ops, IT and Travel are consulted but do not approve.
- How long should an expense policy be?
- Eight to twelve pages for the master policy, plus a one-page addendum per country. Anything longer goes unread; anything shorter cannot cover client meals, travel, cards, exceptions and country compliance with the required specificity.
- How is an expense policy enforced?
- Encode the rules in your expense platform (policy-as-code), surface the relevant clause inline at submission, audit 100% of items above $1,000 and statistically below, and publish a monthly violation-rate dashboard. Enforcement that lives only on PDF is not enforced.
- How often should an expense policy be reviewed?
- Once a year as a hard minimum, plus an out-of-cycle update whenever the IRS, HMRC, SAT, DIAN or Receita Federal changes a relevant deduction rule, mileage rate or per-diem table.
- Templates authored by CPAs / contadores in MX, CO, BR, US
- Country rules updated quarterly (CFDI, DIAN, NF-e, IRS)
- Every output reviewed by an independent SME before merge
Generation pipeline
User input → master prompt → GPT-4o (vendor: OpenAI) → country rule validator → markdown render → PDF/DOCX export. The master prompt and country rule sets are versioned in the public Git repository; LLM responses are not stored in the model.
Training inputs
Country-specific templates and rule sets are authored by named contributors (see /about/authors). We do not fine-tune or train on user submissions. The master prompt is adjusted only after a human-reviewed PR.
Review cadence
Each country pillar (MX, CO, BR, US, UK) is reviewed at least quarterly by the named reviewer for that jurisdiction (see /about/reviewers). Glossary entries are reviewed annually. The reviewedOn date on each page reflects the latest review.
Editorial guard rails
The system declines to render policies containing personally-identifying employee data, claims about specific companies' internal procedures, or country-specific tax advice that requires a registered professional's signature. Outputs are flagged 'AI-assisted' in their footer.
Corrections
If you spot an inaccuracy, email [email protected]. We log corrections in CHANGELOG.md and surface a public diff. Material corrections to a country pillar trigger a re-review by the corresponding reviewer.
FAQ
- Are policies legally binding?
- No. They are starting drafts, not legal advice. Customers must review with their own counsel before adopting.
- Do you store my company's data?
- Form inputs are stored only to render the policy; we do not feed them back into the model. See /trust for the full data policy.
Why this expense-policy library exists
Every page on this site is built from the same opinionated framework: an explicit per-category cap, a named approver chain, a documented exception path, and a review cadence anchored to the controller's close calendar. We publish the framework openly so finance leaders, controllers, and operations teams can adopt it without a vendor lock-in or a six-figure consulting engagement. The expense-policy generator turns the framework into a finished document in three languages, with country-specific tax compliance baked in from the first draft.
Behind every URL is a typed registry — landing pages, glossary entries, calculators, country pillars, and learning hubs are all generated from the same data layer that powers the policy generator itself. That means the per-diem rate you see in the calculator, the GSA-aligned mileage benchmark in the rates table, and the threshold language in the generated PDF are all sourced from one canonical place and refreshed on the same cadence. There is no drift between what we write here and what the generator produces.
Trust signals are non-negotiable: every editorial page lists the reviewer, the review date, and the underlying source — IRS publication, HMRC manual, SAT criterio, Receita Federal IN, or peer-reviewed research. When a regulator updates a per-diem schedule, the change propagates to the calculator, the country pillar, the glossary entry, and the policy template in the same release. That is the bar we hold ourselves to, and the reason controllers across the US, UK, Mexico, Brazil, and the broader LATAM region rely on this library when they re-issue their expense policy each fiscal year.
The editorial program is organized into four parallel surfaces. The industry vertical (SaaS, FinTech, Manufacturing, Retail, Hospitality, Agency, Healthcare, Nonprofit) gives every reader a starting template tuned to the cost categories, regulators, and audit findings that dominate their sector. The country pillar (United States, United Kingdom, Mexico, Brazil, Colombia, Argentina, Chile, Peru, Spain, and Portugal) layers on the local tax-compliance overlay — CFDI, NF-e, DIAN, AFIP, SII, IRS Form 8027, HMRC P11D — so the generated policy is enforceable in every jurisdiction where you operate. The persona track (CFO, controller, finance manager, head of operations, founder) reframes the same building blocks around the buyer's specific quarterly priorities. Finally, the calculator suite (per-diem, mileage, VAT-recovery, T&E benchmark, carbon, tax-id validator) gives finance teams the specific numerical inputs they need to set thresholds, justify caps, and back-test the policy against actual spend before it ships.
Cross-linking between these surfaces is deliberate, not accidental. A SaaS reader landing on the industry page is one click from the country overlay that matches their primary entity, the calculator that backs the per-diem cap they are about to commit to in writing, and the glossary entry that defines whatever IRS or SAT term they have not seen before. We measure the ratio of internal links per page weekly and refuse to publish a new landing without at least four anchors into the topical hubs. That single discipline is why a CFO can land on any page in this library and reach the policy generator in under three clicks — no matter which surface their search engine routed them through.