Wrong allowance on CA's Withholding Certificate

Hi everyone,

 

I'm sorry for what must sound like an easy question. Long story short, I got a new job last year and selected the wrong number of state allowances while filling out the company's elections during my first week.

 

While I correctly selected "single" for federal elections (0 allowances), I selected "head of household" for state elections. This wasn't so much an oversight but more of a confusion when reading "single or married (with two or more incomes)". Since I only have one income, I thought this didn't apply, but I now see how I read that wrong.

 

This means that I've been benefiting from 1 allowance for state tax ever since I joined in September. I just corrected that back to "single" and 0 allowances, but I'm wondering if I need to do anything else other than that.

 

While filing last month, the tax returns were correctly filed as single for both federal and state (I assume because TurboTax does a good job at preventing wrong filing status by asking those initial questions), so I believe my taxes were filed properly.

 

My question is: at the end of the day, does the IRS calculate total withholding vs. tax due for my filing status in the returns regardless of that mistake with allowances? I still got a nice return, so I'm just making sure that I don't need to amend the returns themselves, just the state withholding moving forward.

 

Thank you!