Handing your accountant a folder of invoices and hoping for the best is how a return ends up guessed rather than filed. Below is a full checklist, grouped by where each document comes from, with a toggle for VAT records and one for payroll — tick what applies, and print the result to hand over on paper or attach as a PDF.
The checklist
Turn on the toggles that apply to you and the VAT and payroll sections appear. The printed page matches exactly what is ticked on screen — the toggles and the print button are left out.
Income
Expenses
Bank and cash
Assets and stock
Payroll
VAT
Travel and vehicles
Contracts
When to hand it over
There is no universal deadline here — it is whatever cadence you agreed with your accountant, most often once a month, shortly after the month closes. Some accountants prefer a running handover as documents arrive rather than a single monthly batch. Either way, agree the date and the format (paper, a shared folder, or a PDF export) once, rather than negotiating it every month.
What Lucanto already covers
The four-point checklist built into Lucanto is a subset of the list above — it checks what the app can actually see in its own data: invoices you issued and their paid/unpaid status, receipts you uploaded against expenses, bank transactions it matched, and bank statements — uploaded by hand as a PDF or XML export from your online banking, or brought in by connecting the account directly through Tatra banka. Contracts, travel claims, attendance records, a physical cash count, and payroll paperwork live outside any invoicing tool's reach. Those you still gather yourself, and they belong on this list, not inside the app.