I've been having taxes withheld so far as a Single, but I recently discovered that I'm qualified to file as Head of Household. Because I've been paying too much until now, I would like to reduce my withholding for the rest of the year to end up with the right amount.
Is there any way I can do this? I suspect I would need to fill out Line G, Other Credits, but if I try the calculator and click through to the help section (https://apps.irs.gov/app/withholdingcalculator/helpdocs/taxcredits.htm) on this topic, I don't see anything in here that relates to 'paid too much until now because changing filing status'.
Is it correct that I should use "Other Credits" for this, and if so, how do I calculate what amount to fill in?