Every business owner knows the feeling: the end of the month arrives and suddenly you’re buried in tabs, chasing who owes what and when. A good statement of account template turns that scramble into a calm review. It gives each client a single, trusted story of invoices, credits, payments, opening balance, and what’s still due. In Google Sheets or Excel, you can mirror the best-practice layout accountants use, from clear dates and references to comments and payment terms.
But the real step change comes when you stop being the one who maintains it. Delegating the data entry and reconciliation to an AI agent means those statements stay up to date without you camped in a spreadsheet. The agent can pull new invoices, log payments, roll balances forward, and even generate PDFs, while you stay focused on sales calls, campaigns, or strategic planning instead of line items.
If you run a services business, agency, or fast‑growing ecommerce shop, statements of account are your monthly truth serum: they reveal who’s paid, who hasn’t, and how healthy your cash flow really is. The problem is that building and maintaining them manually in Google Sheets or Excel doesn’t scale.
This guide walks through both worlds: first, how to set up a solid template by hand, then how to hand the busywork to an AI computer agent so it runs reliably in the background.
=OpeningBalance + SUM(Amount column up to this row) - SUM(Payments up to this row)Pros of the manual Sheets approach
Cons
Excel is ideal if your finance team lives on desktop or needs heavier calculations.
Pros of the manual Excel approach
Cons
The moment you find yourself repeating the same clicks—exporting invoices, updating rows, emailing PDFs—you’ve uncovered work an AI computer agent can handle.
A Simular AI agent can:
Step 1 – Design once, manually. Spend a day crafting your “golden” statement template in Google Sheets and/or Excel. Test it on a few clients until you’re happy with the layout and formulas.
Step 2 – Document the ideal process. Write down (or record) the exact steps you take at month‑end:
Step 3 – Let the AI agent replay it. With Simular, you can have the agent follow those same on‑screen steps:
Pros of automating with an AI agent
Cons / considerations
If you manage fewer than ten clients, manual Sheets or Excel might be enough. Once you’re past a few dozen, the cost of human time, context switching, and errors quickly outweighs the effort to onboard an AI agent.
At that point, your job shifts from “spreadsheet operator” to “process designer”: you decide what a perfect statement of account looks like—and let the AI handle the keystrokes at scale.
Start by defining the story you want to tell: opening balance, all activity, and closing balance. In Google Sheets or Excel, create a header with your and the client’s details, period, and reference. Below, build a table with Date, Reference, Description, Type, Amount, Payment, and Running Balance. Use formulas to calculate the running balance and a bold Total Due at the bottom. Test it with one real client before rolling out.
Most small businesses send statements monthly, shortly after month‑end, to match internal reporting and encourage timely payment. If your clients are slow to pay, consider bi‑weekly statements or on‑demand ones after large invoices. Configure your calendar—or your AI agent—to trigger generation on a fixed day. The key is consistency: choose a schedule, communicate it in your terms, and let automation make sure you never skip a cycle.
Lock down everything that should not change: protect formula cells, hide helper columns, and use data validation lists for document types. Always pull data from a single source of truth, like one transactions sheet or export file, rather than ad‑hoc copy‑pastes. Reconcile by checking that opening balance plus all debits minus credits equals closing balance. As you mature, have an AI agent mirror your checks and flag mismatches automatically.
In Google Sheets, clean out any client‑specific rows, keep only the layout, formulas, and static labels, then rename it something like “Statement of Account – Template”. Protect key cells and share with your team as view‑only. Each month, duplicate it for each client. In Excel, do the same and save as a template file. Once stable, you can direct your AI agent to always start from this master instead of ad‑hoc copies.
Design a repeatable flow: filter transactions by period, refresh balances, export each client’s sheet as a PDF, then attach it to an email with a clear subject and due date. Tools like mail merge, scripts, or an AI computer agent can drive these steps. With a Simular AI agent, you can have the system open Sheets or Excel, generate PDFs, log into your email or CRM, and send each statement, all while you supervise from a dashboard.