Form Ba-Bs
Form Ba and Form Bs were Turkish monthly filings in which taxpayers reported purchases and sales of goods and services above a set threshold to the tax administration. They were abolished from the September 2024 period by General Communique No. 565 under the Tax Procedure Law (Official Gazette 25.09.2024, No. 32673).
While the forms were in force, finance teams also used them as a reconciliation device. The amounts in a company's own Ba filing were compared with the counterparty's Bs filing, and if the totals disagreed the team went looking for an unrecorded invoice, a document booked twice or a timing shift between periods. The comparison worked monthly and at total level: it showed how large the gap was, not which invoice caused it. That limitation also explains the abolition. As electronic documents spread, the tax administration was already collecting the same information at document level. Figures published by the Revenue Administration for 2024 put e-invoice volume at roughly one billion documents and e-archive volume at roughly eleven billion, with 1,565,603 registered e-invoice taxpayers.
The filing is gone; the need to compare is not. The same control now runs at document level instead of monthly totals. Inbound and outbound e-invoice and e-archive documents are compared with ledger entries by number, date and amount, and two lists fall out: documents with no entry behind them, and entries with no document. The practical gain is timing. When a counterparty books an invoice into the following period, the old method surfaced it only once the totals failed to agree; a document-level comparison shows the same deviation as a single invoice number, inside the month.
The most common misreading is the leap from 'the forms are gone' to 'reconciliation is unnecessary'. Ba-Bs was never a reconciliation; it was a declaration. It matched no invoice lines, tied no payment to an invoice, produced no customer or supplier balance, and never saw a credit note or an exchange difference. The second misreading is to assume the abolition erases obligations for earlier periods; filings for the periods when the forms applied remain subject to the rules of their own time.
Example
A fictional scenario; the figures are illustrative. While the forms were still in force, a company compared its filings with a supplier: its own Ba total came to TRY 8,640,000 against the supplier's Bs total of TRY 8,910,000. The TRY 270,000 gap was two invoices issued on the last day of the month that reached the buyer's books the following month. The gap only became visible after the month closed, and only as a total. Compared line by line against e-invoice documents today, the same deviation shows up inside the month as two invoice numbers.
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