Onboarding law firms to eBilling asks external organizations to change how they invoice, for the benefit of a client who has already decided. The technical steps are well understood and the resistance is what catches programs out, because a firm that experiences the rollout as an imposition escalates through the relationship, well past the helpdesk. This article covers the communication sequence that prevents that, and what to do when the first rejections arrive anyway.
Why do law firms resist a new eBilling system?
Law firms resist a new eBilling system because it moves cost onto them while the benefit accrues to the client. For context, billing data from about 400 law firms shows invoice rejection rates climbed from 11 to 18 percent in 2025. Submitting a compliant LEDES file requires work their billing team did not previously do, and every rejection consumes partner time that nobody bills for.
The pressure on firms is measurable and it has increased sharply. Elite’s E-Billing After AI Report, drawing on billing data from approximately 400 firms including roughly half of the Am Law 200, found that invoice rejection rates rose from 11 percent to 18 percent during 2025, a climb of 64 percent, as corporate legal departments applied automated and AI-assisted review.
Two further findings explain why firms feel it. Seventy-one percent still manage guideline compliance through primarily manual processes, and 48 percent of Global 200 chief financial officers identified eBilling as their biggest revenue-cycle challenge. A department adding another portal is adding to a problem firms are already losing ground on.
What should be communicated before activation?
Communication should begin two to four weeks before any firm is expected to submit an invoice, giving billing teams time to configure their systems and brief the people who will use the portal.
Four elements belong in that first communication.
- The business reason, stated plainly, covering why the department is making the change.
- The timeline, including when the firm must be ready and when the old route closes.
- What the firm has to do, listed as discrete actions with owners, never described in general terms.
- Who to contact, with a named person and a route that reaches them.
Sponsorship matters as much as content. An announcement from the general counsel or deputy general counsel establishes that the change is a departmental decision, where the same message from legal operations alone invites negotiation firm by firm.
How should the business case be framed to law firms?
The business case should be framed around what the firm gains, since a message built entirely on client-side savings invites the response that the client is asking the firm to fund its cost program.
The firm-side argument is real. Clean submissions get paid faster, rejections consume billing team time and partner attention, and a firm that validates before submitting avoids both. Firms that validate before submitting routinely see the large majority of eBills accepted on first submission, with rejections resolved within days and a noticeably shorter billing cycle.
Framing the change as a shared operational improvement also sets up the conversation that follows. A firm told the rules exist to speed payment responds differently from one told the rules exist to reduce spend.
What information do firms actually need?
Firms need everything required to submit correctly, delivered in one package, never trickled across several emails over several weeks. Incomplete information is the most common cause of a poor first invoice.
A complete pack contains six items.
- The final outside counsel guidelines, in their agreed version.
- The approved rate card, with effective dates.
- The UTBMS code sets authorized for the firm’s matter types.
- The expense rules, covering what is claimable and what is excluded.
- The LEDES specification, naming the exact variant the platform accepts.
- Portal access instructions, with technical requirements and an escalation route.
The authorized code list deserves particular emphasis, since a firm submitting a valid UTBMS code the client has not authorized for that matter type receives a rejection that looks arbitrary from its side. The format detail sits in the LEDES billing format explained.
When is a law firm actually onboarded?
A law firm is onboarded when it has completed five workstreams, and portal account creation is only one of them. They are guideline acceptance, rate loading, timekeeper approval, eBilling enrollment, and communication of review expectations.
Adding a sixth condition protects the first billing cycle. Every firm should submit one successful test invoice before activation, since a real file from the firm’s own billing system exposes formatting behavior that no amount of documentation predicts.
The mechanics of running that workstream across a full panel are covered in outside counsel onboarding and running the workstream.
How should activation be sequenced?
Activation should be sequenced in waves, which limits how many firms encounter the same problem simultaneously and gives the support team a manageable queue. Switching an entire panel on at once produces a volume of questions no team can absorb.
Wave design follows billing volume and readiness together. High-spend firms activate first so the largest share of spend flows correctly early, while firms already submitting through the same portal for another client need less support and can be grouped accordingly.
Wave size should match support capacity honestly. A wave larger than the team can serve produces firms waiting for answers, and a firm waiting for an answer emails an invoice instead.
What should happen when the first rejections arrive?
The first rejections need fast, specific handling, because this is where a manageable change becomes a relationship problem. A rejection that names the line item and the rule breached is actionable, and a generic rejection produces a phone call to a partner.
Three commitments make the difference in that period.
- A named contact per firm for the first billing cycle, so questions have somewhere to go.
- A resolution target the department meets, since a rejection outstanding for weeks becomes a payment delay.
- Root-cause feedback, telling a firm breaching the same rule repeatedly what to change in its own system.
Support volume in this window is predictable enough to staff. On one enterprise legal platform rollout, Basla’s delivery team handled roughly two hundred tickets in the first week after go-live, around sixty percent of which were users asking how to complete a task. The window ran for eight weeks with every report triaged, a model described in why launches fail without a dedicated hypercare triage desk.
What should be measured and shared back?
Measurement should cover both sides of the relationship, and sharing it with firms turns enforcement into a conversation about improvement.
Five measures carry the picture: first-pass acceptance rate by firm, rejection rate by reason, average rejection resolution time, the proportion of firms that have completed all onboarding steps, and time from approval to payment.
Publishing rejection metrics by firm and cause on a regular cycle changes behavior more reliably than escalation does. A firm seeing that it sits below its peers on first-pass acceptance usually fixes the cause without being asked, and a department seeing that most rejections trace to one rule usually finds the problem is its own configuration.
Conclusion
Onboarding law firms to eBilling succeeds when firms understand the change, can prepare for it, and have somewhere to go when something breaks. The configuration is the department’s problem, and the experience belongs to people outside it.
Four practices prevent the revolt. Communicate two to four weeks before activation with sponsorship from the general counsel, so the change reads as a departmental decision. Send one complete pack containing the guidelines, rate card, authorized codes, expense rules, LEDES specification, and access instructions. Require a successful test invoice from every firm before activation, because format problems caught in test never become disputes. And publish rejection metrics by firm and cause, since visibility corrects behavior on both sides faster than escalation.
How Basla can help
Basla provides delivery teams for enterprise legal management and eBilling software implementation, covering legal technology consulting, business analysis, billing guideline configuration, vendor onboarding support, rule testing, documentation, and post-go-live support. Basla has supported matter management and eBilling programs spanning more than ten global jurisdictions.
Frequently asked questions
Why do law firms resist a new eBilling system?
Law firms resist because the system moves effort onto them while the benefit accrues to the client. Compliant submission requires work their billing team did not previously do, and rejections consume partner time that nobody bills for.
How far in advance should firms be told about an eBilling rollout?
Firms should be told two to four weeks before they are expected to submit an invoice, which gives billing teams time to configure their systems and brief the people who will use the portal. The announcement carries more weight coming from the general counsel than from legal operations alone.
What information should law firms receive before eBilling activation?
Firms should receive one complete pack containing the final outside counsel guidelines, the approved rate card with effective dates, the authorized UTBMS code sets for their matter types, the expense rules, the LEDES specification naming the exact variant accepted, and portal access instructions with an escalation route.
When is a law firm considered onboarded to eBilling?
A firm is onboarded once it has completed guideline acceptance, rate loading, timekeeper approval, eBilling enrollment, and briefing on review expectations. Adding a successful test invoice as a sixth condition protects the first live billing cycle.
Should all law firms be activated at the same time?
Firms should be activated in waves sized to match support capacity, with the highest-spend firms first so the largest share of spend flows correctly early. Activating an entire panel simultaneously produces a volume of questions no support team can absorb.
How should a department handle the first wave of rejections?
The department should give each firm a named contact for the first billing cycle, meet a resolution target it has published, and provide root-cause feedback so firms breaching the same rule repeatedly can correct their own systems.
*This article is provided for general information only and does not constitute legal advice. Basla Solutions provides legal technology implementation and support services and does not practice law.*