What does this mean

dozy:
900-1050 pw ( standard paye plus holidays )
Or
900-1250 pw ( ( paye rolled up including holiday & additional to cover deductions )
I think I get the holidays parts of pay , first one is normal holiday pay , 2 nd rolled up ?
But what is ( + additional to cover deductions) ? , and which is the best option , ta

The holidsy pay on £1050 would be £126.75, so at a guess, the other £74 is to pay the umbrella costs.