Starting on September 25, 2026, 13.8 million taxpayers in France will begin making additional tax payments to the government. These payments, averaging 1,798 euros per household, are part of an annual tax adjustment process. This adjustment occurs after the government reviews the previous year’s tax returns and compares them with the amount already deducted from taxpayers’ paychecks or other income sources throughout the year. If the deductions made in 2025 were insufficient to cover the full tax liability, the difference must now be paid. This year’s adjustment affects 13.8 million households, a slight increase from the previous year, when 13.1 million taxpayers had an average adjustment of 1,910 euros. However, not all taxpayers will owe money—some may receive refunds. In July 2026, 12.6 million households received automatic refunds averaging 1,057 euros, typically because too much tax had been withheld earlier in the year or due to eligible tax credits or reductions. The adjustment can be triggered by several factors, such as a salary increase that changes the tax rate applied, or a change in family status, such as a divorce or the birth of a child. Additionally, some taxpayers may have received advance tax credits in January 2026, which could now need to be reconciled with the final tax amount. If the advance was higher than the actual tax owed, the difference will be recovered through the adjustment process. Taxpayers can check if they are affected by reviewing their latest tax notice, available on the official government website, impots.gouv.fr. This notice includes the amount due, the payment dates, and the bank account from which the payment will be made. If the amount owed is 300 euros or less, it will be deducted in one lump sum. For larger amounts, the payment will be split into four equal installments, beginning on September 25, 2026, and continuing on September 26, November 25, and December 28 of the same year. Those facing financial difficulties can request a payment extension through their tax account or by contacting their local tax office.