The threshold for your vAT exemption

I don't think they index that amount. You can find more information in this brochure: https://eservices.minfin.fgov.be/myminfin-web/pages/public/fisconet/document/f9074bce-3eb3-4cf6-afbd-2664dd5666eb

So, in exceptional cases, you can go 10% higher.

1. Transition from the tax exemption scheme to the normal scheme If, as a result of an increase in turnover, a taxpayer benefiting from the exemption scheme exceeds the turnover ceiling of €25,000, they must notify the competent SME management team by registered letter. He will be subject to the normal tax regime. He will no longer be able to select the flat-rate scheme, as this scheme is no longer available to taxpayers who were not subject to it on 31 December 2021. However, if the turnover ceiling is exceeded on an exceptional basis, they will retain the benefit of the exemption by virtue of an administrative concession if the turnover does not exceed 27,500 euros (maximum turnover increased by 10%) during the calendar year. This concession is only possible if the threshold is exceeded by a maximum of 10% and is exceptional. Except in this case, the taxpayer will be subject to the normal rules from the first transaction for which the turnover ceiling of 25,000 euros was exceeded. The taxpayer's tax regime will therefore have to be edited as soon as possible and a regularisation will have to be carried out from the first transaction in which the threshold is exceeded. This transaction will have to be taxed in its entirety.