Billing & ERP Integration

Billing and finance is where a firm’s work turns into revenue, and where small inefficiencies compound into real money and real client friction. Time has to be captured, matters reconciled, invoices produced in the format each client demands, and the whole flow tied into the firm’s finance or ERP system without anyone re-keying a number. We integrate billing and ERP so the path from time to cash is clean and auditable, as part of our CMS, PMA & ERP practice.

The integration problem

The pain is rarely one system. It is the gaps between them: time captured in one place, matters in another, invoices in a third, and the general ledger in a fourth, stitched together by manual export and re-entry. Every handoff is a chance for error, delay, and a write-off. The work is making the data move once, automatically, from matter to time to invoice to ledger, with no double entry, the same discipline we bring to any system integration.

e-billing is a client requirement, not a nicety

Corporate clients increasingly dictate how they will be billed: LEDES files, specific task codes, e-billing portals, and rules that reject a non-compliant invoice outright. A firm that cannot meet those rules waits longer to get paid and spends partner time on rework. We build the billing flow to produce compliant invoices the first time, so cash arrives faster and the finance team stops firefighting rejections.

A worked example

A firm captured time in its practice system but rebuilt every invoice by hand in a finance package, because the two had never been connected. Month-end was a week of reconciliation and a steady trickle of client rejections over format. We integrated the two so time flowed to invoice to ledger automatically, built the LEDES output the firm’s largest clients required, and added a check that caught format errors before an invoice went out. The billing run dropped to a day and the rejection rate fell to near zero.

Common pitfalls we are brought in to fix

• Double entry. Re-keying between time, billing, and finance is slow and error-prone. Make the data move once.
• Ignoring client billing rules. Non-compliant invoices get rejected, and payment slips. Build to the rules.
• Reconciliation by spreadsheet. A month-end built on manual exports does not scale and hides errors.
• No audit trail. Finance integrations need to be traceable end to end, not a black box.

What good looks like

Time captured once flows to a compliant invoice and into a reconciled ledger with no re-keying, month-end takes a day, and client rejections are rare. The finance data is clean enough to feed real reporting on realisation, write-offs, and profitability, rather than a number nobody quite trusts.

Trust accounting and compliance

Legal billing is not ordinary billing. Client money in trust carries strict rules, three-way reconciliation, no commingling, and jurisdiction-specific reporting, and getting them wrong is a regulatory problem, not just an accounting one. Any integration we build respects the trust-accounting boundary and keeps the audit trail a regulator would expect. The point of automating the flow is to remove manual error from exactly the place where manual error is most expensive.

From clean data to real profitability

Once time, billing, and finance share one trustworthy ledger, the firm can finally see the numbers that matter: realisation, write-offs, effective rates, and profitability by matter, client, and team. Most firms cannot, because the data is scattered and contested. We make the flow clean enough that those metrics are trustworthy, then feed them into reporting so leadership manages by evidence rather than by instinct about which clients are worth the trouble.

The matter-to-ledger mapping

The quiet complexity in legal finance is the mapping between how a firm works and how it accounts. Matters, clients, practice groups, and offices all have to map cleanly onto the chart of accounts, or the reports that leadership relies on are built on sand. Get the mapping right and the firm can slice revenue and profitability by any dimension that matters. Get it wrong and every report needs a manual adjustment and a footnote nobody trusts. We design that mapping deliberately, as part of the integration, so the operational and the financial views of the firm reconcile by construction rather than by month-end heroics.

Rate and discount management is the other place money leaks. Different clients have different rates, matters carry different arrangements, and write-offs happen at the edges where nobody is watching. An integrated flow makes those visible: the rate that should apply is applied automatically, exceptions are flagged rather than buried, and the partner can see realisation by client and matter rather than discovering at year end that a major client has been quietly unprofitable. The point of connecting the systems is not just speed. It is turning finance from a record of what happened into a control on what is happening.

How we engage

We map the flow from time to cash, find the gaps where data is re-keyed, integrate the billing and finance layers, build the e-billing output your clients require, add validation and an audit trail, and reconcile. Run on retainer or handed over owned.

How finance connects to everything else

A billing and ERP integration is never really a standalone project, because the data it moves originates elsewhere and the insight it produces feeds elsewhere. Time and matter data come from practice management, so the two have to be connected or the firm is reconciling by hand. The clean financial data the integration produces is what makes trustworthy reporting on realisation and profitability possible at all. And where the firm wants AI to help with finance tasks, summarising spend, flagging anomalies, drafting narratives, it has to reach the finance system through a governed integration rather than a copy-paste. We scope billing work with those connections in mind, so the result is a finance layer that participates in the firm rather than an island that has to be manually bridged at every month-end. That is the difference between an integration that saves a few hours and one that changes how the firm sees its own economics.

We usually start with the highest-friction part of the flow rather than a big-bang replacement: connect time capture to invoicing first, prove the month-end gets faster, then extend to the ledger and the e-billing rules. A phased path means the firm sees a return within the first cycle instead of waiting for a year-long programme to finish, and each phase de-risks the next. The aim throughout is fewer hands touching each number, because every manual touch in finance is both a delay and a place an error can hide.