Investors & landlords

He has no dependents, so he has never claimed HOH. I've claimed it for last 8 year living on my own.  Now that we are moving in together would they look at who is making more money to determine who is paying half the household expenses?  I assume since my taxes have not changed in the past 8 years are far as standard deductions and status, and the only thing changing is an address, I probably am overthinking this?