A certain tax formula requires increasing the result of a subtraction of two
numbers to the next highest 1000
For example, when subtracting 2250 from 5000, the result of 2750 must be
increased by 250, which is the next highest 1000; this would also be the case
if 2250 is subtracted from 4300, which results in 2050 - you would increase
it to 2100.

If cell A1 is the higher number, Cell A2 is the lower number, and the result
is in Cell A3, what would be the formula in Cell A3 for increasing the result
to the next highest 1000?

The formula needs to be part of an "If" function, since if the subtraction
yields zero, then zero must be in Cell A3.

Thank you
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MZ