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In accounting, no less than a ruble, when administrators in 100 rubles can not allocate VAT!
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Even with VAT you are putting a wrong task. 100 rubles is 100 rubles, there is no VAT. I am like an admin if I get a salary, then in 100 rubles of my salary will be 0 VAT. If this is the amount that must be taxed VAT, it will be +18%, i.e. by 18 rub. If this is the amount paid with VAT, then the VAT paid from there will be 100-100 / 1.18 = 15.25.
The matter is only that the admin does not have to know anything about VAT on work. His relationship with finance is limited to his salary. But the accountant should know the basics of working with the PC and generally have at least a little common sense, and not get stuck at work.