Editorial policy and corrections
How a rule gets onto this site, how it is checked, and what happens when it is wrong.
This page was last reviewed on 24 September 2026
Primary sources first
A rule is written from the instrument that makes it: the law, its executive regulation, the ministerial decision or the regulator's circular, read in its official language, which is Arabic in five of the six countries. Law-firm briefings, news reports and other calculators are used to find a rule, not as the rule itself. Where a rule has so far been checked only against a secondary source, its note in the rule file says so.
Every rule carries two dates
Each rule carries the date it took effect and the date it was last read against its source. A rule not yet confirmed against its official text is flagged, and the page names it beside any figure it affected. The full list is on the sources page.
How often rules are re-read
Rules are read again at least once a year, and whenever an amendment is announced. Rules that change administratively, such as rates and fees, carry a shorter review interval in their own file. A rule known to expire on a date carries that date, and the site's tests fail the day after it passes.
Independence
No page is paid for, and no calculator's result is influenced by anyone who stands to gain from it. If the site ever carries advertising or referral links, they will be labelled as such, kept apart from the calculation, and described on the privacy page.
Corrections
When a figure or a rule turns out to be wrong, the rule is corrected, the page's review date moves, and the rule appears on the changes page under the day it was re-read. To report an error, write to the address on the contact page.