The Czech Financial Administration announced that starting 1 July 2026, taxpayers who belong to the first bracket of the flat‑rate tax regime will see their monthly Advance Payment (záloha) reduced from 9,984 CZK to 9,162 CZK. This reduction stems from a recent change in the method of calculating social‑security contributions for self‑employed individuals (OSČ). Consequently, anyone who paid the higher 9,984 CZK advance in the period from January to June 2026 will receive a refund of the difference, amounting to 4,932 CZK. The measure is part of broader adjustments to tax contributions that aim to reflect the latest legislative changes concerning pension insurance contributions. The announcement was published as part of the June 2026 press releases of the Financial Administration and is intended to provide clarity for taxpayers who rely on the flat‑rate system for their tax obligations. The reduction applies only to the first bracket and does not affect other tax categories. Taxpayers are advised to check their payment history and to prepare for the adjusted amount from July onward, ensuring that their future payments are aligned with the new rates.