Is ‘that’ required in the following sentence?
Your responsibilities and expenditure expand in a way (that) you may not have expected.
Is ‘that’ required in the following sentence?
Your responsibilities and expenditure expand in a way (that) you may not have expected.
No, you can omit it.
Will it be grammatically wrong if someone uses it and make the sentence?
Your responsibilities and expenditure expand in a way that you may not have expected.
In the context you reference the sentence is more likely to contain the ‘that’ that it is to omit it.
Sorry sir, did not get you.
Your sentence is fine with ‘that’ in it.
There is nothing wrong with the use of that in your sentence although you are free to omit it.