My office is in MA. I live in NH and work from home 60 percent of the time. In past years, I would get a large amount back for this. Not this year. How do I do this?

It depends.

• If you own the business, your mileage methods should not have changed.
• If you are an employee, then you know the Federal law changed in 2018 and employee expenses will return in  2025.
• New Hampshire is not taxing your wages.
• MA adopted the same legislation as the federal.

You may want to review last year's return and see if something else caused you to have such a large refund.

I assume  you are asking about getting a refund  of the portion MA withholding that  is attributable to physically working in NH. I also assume you are filing a non-resident MA return. I also assume that on your W-2, the box 16 amount is your whole year salary and box 15 is MA

It's a matter of allocating some of your salary as MA and the rest as non MA. 

I'm not familiar with the MA software, in  particular, but for most states, it works like this:

At the W-2 screen in TurboTax (TT), enter two lines of Boxes 15-17.  On the 1st line put NH in box 15 and 60% ("work from home 60 percent of the time") of your salary in box 16; leave box 17 blank.  On the 2nd line put MA in box 15, 40% of your salary in box 16 and all the MA withholding in box 17.   This should cause TT to allocate your wages, by state.  

Alternatively, you may simple be presented with allocation boxes in the TT interview.