tax returns
There's always been a certain tolerance for 'minor' mistakes, like getting two numbers swapped, as long as the error was < 10%. I remember French friends telling me that if I had to enter a salary number like, say, 32910 on a tax form I should write it as 32190. If I got audited, sorry monsieur, silly mistake, I'll correct it. No problem, no fine. 23910 would have been pushing my luck too far.