Invoicing Software for Accounting Firms

CPA firms rarely operate on a single billing model. A typical client might have a fixed-fee 1040 or 1120 return, hourly advisory work for entity structuring or M&A due diligence, and a monthly bookkeeping retainer — all running simultaneously. Billed lets you attach multiple engagement types to one client record, each with its own billing terms, rate schedule, and invoice cadence.

Fixed-fee engagements use a flat amount tied to the return type and complexity tier. Hourly advisory work pulls from time entries logged against that engagement, with rates set per staff level. Monthly retainers generate automatically on a schedule you define. When a client's needs change mid-year — say they add payroll processing or need an amended return — you adjust the relevant engagement without rebuilding the entire billing relationship from scratch.

This multi-model approach mirrors how modern accounting firms actually price services: value-based for compliance work, hourly for unpredictable advisory, and recurring for steady-state bookkeeping. One client, one record, multiple revenue streams — all invoiced accurately.

Unbilled work-in-progress is one of the biggest margin leaks in accounting firms. Staff switch between engagements dozens of times per day, and when time goes unlogged, it never makes it to an invoice. Billed captures time entries by client, engagement type, and staff member so WIP balances stay current rather than piling up for a quarterly reconciliation.

Role-based billing rates — partner, manager, senior, and staff — apply automatically to each time entry. A partner's hour on an advisory call bills at a different rate than a staff accountant's data entry on the same engagement. Weekly WIP reviews let billing partners catch entries with missing descriptions or incorrect engagement codes before invoices go out, reducing write-downs caused by vague or misallocated time.

Realization rate reporting shows you how much of your recorded time actually converts to collected revenue. When a particular engagement type consistently realizes below 80%, that signals a pricing problem, a scope-creep issue, or a staffing mismatch — all fixable before the next busy season begins.

Tax season compresses roughly 40% of annual revenue into four months. Invoice volume can triple while your team's bandwidth for administrative tasks shrinks to almost zero. Billed's recurring invoice automation keeps monthly bookkeeping and payroll clients billed on schedule without manual intervention, so that steady revenue stream doesn't stall while your team focuses on returns.

For tax-prep clients, invoice templates organized by return type — individual 1040, partnership 1065, corporate 1120, nonprofit 990 — let you generate invoices in batches. Attach the engagement letter, set a deposit requirement, and send both in one step. Clients confirm scope, sign electronically, and pay the deposit before you begin work.

Automated payment reminders handle follow-up on outstanding invoices so your team isn't chasing payments during peak filing weeks. When returns go on extension past April 15, the original invoice stays linked to the engagement — just update the scope note and balance when the extended return ships. No duplicate records, no orphaned payments.

Accounting firms regularly incur costs on behalf of clients: state filing fees, e-file transmission charges, registered agent fees, tax research database access, and sometimes travel for on-site audit work. These pass-through expenses need to appear on client invoices as distinct line items, separate from professional service fees, so clients understand exactly what they're paying for.

Billed lets you categorize each expense as reimbursable or firm-overhead at the time of entry. Reimbursable items appear on the next client invoice with a clear description and amount. Firm-overhead expenses — CPE courses, E&O insurance premiums, software subscriptions used across all clients — stay on your internal expense reports for your own year-end close.

This separation matters for more than client transparency. When you run profitability reports by engagement, clean cost allocation tells you whether a client's advisory work is truly profitable after factoring in the research database hours and filing costs you absorbed. Firms that lump everything together often discover too late that their highest-revenue clients are actually their lowest-margin ones.

Most accounting firms face a pronounced revenue cycle: heavy collections in Q1 and Q4 around individual and corporate filing deadlines, with leaner months from May through August. This seasonality creates cash-flow gaps that make it hard to cover steady expenses like payroll, rent, and software licenses year-round.

Recurring invoices for monthly bookkeeping, payroll processing, and controller-service clients provide a revenue floor that smooths out the peaks and valleys. Billed automates these on whatever cadence you set — monthly, biweekly, or quarterly — so baseline revenue keeps flowing without manual effort. For seasonal tax-prep clients, deposit invoices collected at engagement kickoff pull revenue forward, reducing the gap between when work begins and when you get paid.

Payment aging reports show you at a glance which invoices are current, 30-day, 60-day, or 90-day overdue. During slower months, these reports become your collections priority list. Addressing overdue accounts in June is far easier than trying to collect while simultaneously managing October's extension-filing rush.

Scope creep is endemic in accounting. A client asks one quick question about their LLC structure, then another about estimated payments, and suddenly you've provided an hour of advisory that was never part of the original engagement. Without clear scope documentation tied to billing, that work becomes a write-off.

Billed lets you attach engagement letters directly to client invoices, so the agreed scope is always visible when billing questions arise. When a client requests work outside the original engagement — a cost segregation study, an amended return, payroll setup — create a new engagement with its own letter and fee structure. The client sees exactly what each service costs before you begin.

Transparent invoices build trust with clients who are often accountants or financially sophisticated themselves. Itemized line items showing hours by staff member, task descriptions, and separated pass-through costs demonstrate professionalism that generic one-line invoices never achieve. For firms transitioning from hourly billing to value-based pricing, clear scope documentation also makes the case for fixed fees — clients see what's included and what constitutes additional work.