Annex 24 electronic accounting, built from your own books.
The chart of accounts, the trial balance and the journal entries, in the XML required by the SAT (Mexico’s tax authority), generated from the general ledger and not from a separate spreadsheet someone keeps up on the side.
How it works
The chart of accounts comes with its grouping codes
When the chart of accounts is set up, every account gets a suggested SAT grouping code with the correct category digit.
Your signed-off days fill the ledger
The trial balance comes from the same books you’re looking at.
Generate the period’s files
Chart of accounts, monthly trial balance and journal entries, with the UUIDs of each day’s e-invoices already linked.
Your accountant signs and submits
With the hotel’s e.firma, through the Buzón Tributario.
What’s included
- Chart of accounts (Annex 24, section A) with the SAT grouping code on every account.
- Monthly trial balance with opening balance, activity and ending balance.
- The period’s journal entries, for when the SAT requests them, with the UUIDs of each day’s e-invoices already linked.
- A suggested SAT grouping code for each account when the chart is set up, with the correct category digit (1 assets, 2 liabilities, 3 equity, 4 revenue, 5 costs, 6 expenses).
- Tax details are taken from the RFC (tax ID) the hotel already invoices under: they’re never entered twice.
The limit, stated plainly
The file comes out unsealed. Sealing it requires the hotel’s e.firma (advanced electronic signature), which is a different certificate from the one used for invoicing, and we don’t ask for it: an advanced electronic signature shouldn’t live in a system the hotel doesn’t control.
Containn generates the file; the one who signs it and uploads it through the Buzón Tributario (the SAT’s online tax mailbox) is the accountant, with the hotel’s e.firma. If a vendor offers to “send it for you,” ask them where they keep your e.firma.
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Frequently asked questions
Can’t find the answer? Message us on WhatsApp +52 222 813 7952
Does Containn file my taxes?
No. Containn delivers the books and the files; your accountant files the return.
Does it work if my accountant uses another system?
Yes. The Annex 24 files are the SAT’s format, not one of ours.
What about lodging tax (ISH)?
Today the lodging tax (ISH) on room revenue is recorded together with VAT (IVA) in the taxes payable account: as a liability, never as revenue. Moving it to its own account is in development.
Start with yesterday.
If your hotel already signs off on its night audit, Containn can post yesterday today. The chart of accounts is set up in one step, the transaction code mapping is done once, and from then on every signed-off day becomes a journal entry.