The bottleneck in your accounting firm is not the tax filings. It is the supplier invoices your clients dump on you at the last minute, badly reconciled, in different formats, multiplied across every client. ininvoice automates receipt and reconciliation before the invoice ever reaches you. You post with clean data.

The problem of accounting firms with SME clients

If you handle accounting for multiple clients, you know the pattern: at month-end you get a Dropbox/email with 200 loose PDFs, with no order, no PO reference, some duplicates, some with no PO. Your team spends half the month just reconciling before you can even start posting.

Multiplied by 30 clients, that is hundreds of hours wasted on a manual task that only adds risk: posting errors, undetected overpayments, late closes.

How ininvoice changes the firm's workflow

The client connects their email to ininvoice (Gmail). They don't have to forward anything.
ininvoice captures every invoice arriving at the client's inbox.
Line-by-line OCR + cross-check against PO + delivery note, applied per client.
Reconciled invoices are exported as importable CSV for the client's ERP (Holded, Sage, A3, Contasol, Quipu).
Unreconciled ones are routed to the client to resolve. They don't reach you until they are clean.
Your firm posts the already-validated batch at close time.

What changes for your firm

Less "reconciliation" time at close. Invoices reach you already matched against the client's PO.
Raise your value to the client. You move from doing expensive "data entry" to real advisory work.
Detect overpayments for the client. A service that justifies raising your fees.
Standardize the workflow across clients. Same process for everyone.
Prepare your clients for Verifactu and mandatory e-invoicing 2026-2027. The invoices still land in an inbox and still have to be controlled before posting; ininvoice keeps that check in place.

Use models for accounting firms

Option A: client pays

Your clients with unused Kit Digital can fund part of the cost: Kit Digital for firms handling supplier invoices.

The client subscribes to ininvoice (49 EUR/month) and invites you to their environment as a manager. You access their panel, review critical exceptions, post. The firm benefits from clean data at no extra cost.

Option B: firm resells

Your firm subscribes to ininvoice as an aggregator and bills the client with a margin baked into your fees. Same software, different billing. We'll discuss the structure beforehand.

Option C: firm centralizes

A single ininvoice account manages multiple clients (multi-tenant). Each client with their POs, suppliers and rules. Your firm has a master panel with a view across all of them. Custom plan; let's talk first.

Which kind of firm it fits best

Firms with an SME portfolio between 10 and 50 clients.
Clients in sectors with many suppliers: distribution, multi-location hospitality, retail, construction, manufacturing.
Firms already saturated at month-end close, cutting margin to keep up.
Firms that want to position as a "tech firm" / "controllership firm" instead of a traditional bookkeeping firm.

Where it does NOT fit

Firms that only handle freelancers (1-2 invoices/month per client).
Firms with no digitalized base process (clients still sending paper).
Portfolios with pure B2C clients with no meaningful suppliers.

Regulatory compliance: one tool for three fronts

ininvoice covers the three regulatory frameworks affecting your clients:

Mandatory B2B e-invoicing (Spanish RD 238/2026): when large suppliers start sending structured e-invoices from September 2026, your clients still have to control every invoice against its PO and delivery note before posting; that is what ininvoice does.
Verifactu (RD 1007/2023): the regulation mainly binds the issuer. On the receiving side the job stays the same: read each invoice, match it and keep an auditable trail before you pay.
SII: fast matching enables 4-day reporting.

Do you keep the books for several SMEs?

Connect Gmail and match your real invoices against their POs and delivery notes. Start free — 20 documents, no card.

Frequently asked questions

How do I, as the firm, access my client's invoices?: The client invites you to their environment as a manager. You see all their validated invoices, pending exceptions and export the batch to post.
Does it work with clients using different ERPs?: Yes. Each client exports to its respective ERP (Holded, Sage, A3, Contasol, Quipu). ininvoice adapts to each one's stack.
Does my client lose control of their data?: No. The account belongs to the client, the invoices belong to the client. You access with explicit permission as a manager.
How many clients can I manage?: No limit. Each client on their own plan. If you want an aggregated model for a firm with a large portfolio, let's discuss a dedicated plan.
How much does it cost?: Standard client plan: 49 EUR/month for up to 200 documents/month. For aggregated firm models, let's talk first.

Move your firm from "bookkeeping" to "controllership"

Clean data at close, overpayments detected for your client, immediate ROI on fees.

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Accounts payable for accounting firms: manage AP across multiple clients